JP5768236B2 - Anti-counterfeit printed matter, anti-counterfeit printed material preparation apparatus, and anti-counterfeit printed matter preparation method - Google Patents

Description

  The present invention relates to an anti-counterfeit printed material, an anti-counterfeit printed material manufacturing apparatus, and an anti-counterfeit printed material that are required to prevent counterfeiting or duplication of securities such as banknotes, stock certificates and bonds, various certificates and important documents. It is related with the preparation method of this.

  In general, various technologies have been applied to valuable printed matter of certificates in order to provide an effect of preventing forgery. However, in recent years, forgery of certificates has been accompanied by the improvement in image quality of color copiers and computerization of color platemaking technology. Technology tends to diversify. Along with this, the certificates have responded by upgrading the anti-counterfeiting measures. However, on the other hand, if the manufacturing cost to spend on anti-counterfeiting measures is high, and it is expensive in authenticity judgment, such as introducing dedicated equipment consisting of special machinery and equipment, in order to obtain an environment for confirming the anti-counterfeiting effect was there.

  As a useful method for enabling authenticity determination at low cost, there is a technique for performing authenticity determination by overlaying a discriminator on a printed material. In other words, an invisible image is expressed as a visible image by overlaying a discriminating tool on a printed material on which an invisible image is applied. Line filters ”), lenticular lenses, and the like. There are mainly two types of techniques for expressing an invisible image using this discriminator, and there are point phase modulation and line phase modulation.

  A printed material on which a latent image appears by superimposing such discriminating tools composed of line filters, and its true / false discrimination method include a background image portion printed with a line (or halftone) line, and a background image. There is a printed matter having a latent image portion printed with a line (or halftone dot) line having a phase different from that of the portion. The background image portion and the latent image portion of the printed matter are difficult to see at a glance, but when the line filter is superimposed on the printed matter at a predetermined position, the background image portion and the latent image portion are visible. A method is known in which a part can be divided and visually recognized.

  As an example of dot phase modulation (Dot phase modulation), a printed material on which a pattern phase-modulated in a first direction and a second direction is formed, a first direction of the printed material, and a line of a line filter The first multi-tone image formed by superimposing the line filters so as to match the direction of the line pattern and the angle at which the line filters are overlapped coincide with the second direction of the printed matter. In other words, there is a printed matter on which a second multi-tone image is formed and an image forming method (see, for example, Patent Document 1).

  In addition, as an example of dot phase modulation, each dot constituting a dot pattern in which an image appears by overlapping a lens array (fly eye lens, honeycomb lens, lenticular lens, etc.) on a base material. However, in a printed matter composed of at least two types of screen lines and at least two types of screen angle halftone dots, the dot area ratio of each dot constituting the dot pattern is the same if it is genuine. Therefore, an invisible image appears by overlapping the lens array, and in the case of a copy, the dots that are reproduced with the size of screen lines or the dot angle are crushed by copying and the dot density changes. There is a printed matter in which an image different from an invisible image appears (see, for example, Patent Document 2).

  As an example of overseas dot phase modulation, there is an isogram from Astron Design (Netherlands) (for example, see page 1340 of Non-Patent Document). In a flat pattern having a uniform density at first glance, an invisible image is formed by the phase of fine halftone dots when enlarged, and when a dedicated sheet is placed on the printed material, it is visible in either a negative or positive shape. An imaged invisible image appears. However, since this is a flat pattern having a uniform density, an image cannot be clearly expressed.

  In addition, the applicant of the present application has filed a patent application relating to a printed matter using dot phase modulation. This is a latent image printed matter in which a plurality of pixels of the same color are regularly arranged on a substrate to form two latent image patterns, and the phases of the plurality of pixels are shifted in the first direction. It has a first latent image pattern (invisible image) by the arranged first region and a second latent image pattern (invisible image) by the second region printed by the functional ink. (For example, refer to Patent Document 3).

  As an example of line phase modulation, the line phase is shifted by 1/2 pitch with respect to the line pattern having the line part and the non-line part on the base material and having the same pitch and width. A plurality of types of latent image line patterns provided with the formed latent image portions are printed matter having latent images that are printed by being overlapped at different angles, and the plurality of types of latent image line patterns are respectively colored. There is a printed matter characterized by a difference, and a latent image portion is made visible by superimposing a plurality of invisible images on a film having the same pitch as the line pattern of the printed matter (for example, Patent Document 4). reference).

  Moreover, HIT (Hidden Image Technology) of Yura (Hungary) is a printed material using overseas line phase modulation (see page 1341). An invisible image was given by the phase of fine lines in a flat pattern with a uniform density at first glance, and when a dedicated sheet was superimposed on the printed matter, it was visualized in either negative or positive form. An invisible image appears. In this method, since there is a possibility that an invisible image can be confirmed even with normal viewing, a visible image is provided by changing a part of the line width of a line as a camouflage pattern. Moreover, you may provide a visible image with a white drawing line. However, this camouflage pattern has a problem that when the invisible image is made visible by overlapping a dedicated sheet, the camouflage pattern also appears as a visible image at the same time. .

  In general, a pattern formed by dot phase modulation or line phase modulation has a flat shape.

  The inventors of the present application also include a first image line and a second image line arranged to face the center along the first direction, and a second direction orthogonal to the first direction. The image line elements having the third image line and the fourth image line arranged so as to face each other with the center as a boundary along the direction are arranged in a plurality of matrix shapes at a constant pitch. The first image line and the second image line, and the third image line and the fourth image line in the image line element are in a negative-positive relationship, and the first image line or the second image line is the first image line. An application has been filed for a forgery-preventing printed matter in which an invisible image is formed and a second invisible image is formed by the third image line or the fourth image line (see, for example, Patent Document 5). .

  The forgery prevention printed matter according to Patent Document 5 can be provided with a visible image in normal observation, has a rich design, and has a high visibility of a latent image in a simple discriminator, and can be manufactured at low cost. Although it has an excellent effect, it is insufficient as a forgery prevention measure in high-resolution hard copy.

  The inventors of the present application have filed a method for embedding invisible information in a printed material by some means and for reading the invisible information by some means as a forgery prevention measure in high-resolution hard copy.

  Today, there are various methods and means depending on the sensor for reading. As a mechanical reading inspection method for printed matter, there are mainly used functional inks such as magnetic ink, infrared reflection absorption ink and fluorescent ink, and detection of materials such as fibers, materials and chemicals forming a printing medium. However, these technologies are caused by specific electromagnetic waves that cannot be detected by humans. Many of these technologies depend on the material suitability for producing printed matter, and are only applied to products that are economical in terms of production cost. I can't.

  On the other hand, as a method not particularly considering the production cost of the printed matter, there is an optical reading method for a pattern on the printed matter to which a printing material such as a visible general printing ink can be applied. As comparatively easy optical reading methods, OCR, OMR, barcode, two-dimensional code, etc. are known, but the figures used in these optical reading methods do not have any design properties and are not available in existing products. When used, changes in design and specifications are required.

  In addition, these optical reading methods are also widely available in the market, and since the codes can be seen as printed lines, there is a risk of decoding and tampering, which is insufficient to prevent counterfeiting and alteration. It is.

  Furthermore, there is a series of techniques generally called electronic watermarks as a method for providing reading information without changing the design such as the design by the optical reading method. The electronic watermark is also referred to as a concealed image or a digital watermark, and is a technology for embedding copyright information in a document file or a printed material in a copy technology or a DTP technology with advanced functions. As a well-known representative technique for printed materials, there is a method called frequency utilization type.

  Electronic watermarks are said to have little deterioration in frequency characteristics even in duplicates. Recently, digital watermarks are often applied to digital images distributed on the Internet for the purpose of copyright protection. In addition, since it has an effect on printed matter, it is often used for posters.

  It is a continuous gradation (photographic gradation) pattern that an electronic watermark can exert the most effect. Since the continuous tone (photo gradation) pattern is multi-valued image data, there is sufficient redundancy, so not only the frequency-based type but also the pixel replacement type, the pixel space usage type, the quantization error diffusion type, etc. A method is proposed, and there are many literatures and patent applications.

  However, since many electronic watermarks are designed for image resolution of general commercial printing, there is a feature that the original information is copied as it is in the duplicate, and as a measure to show the copyright of the duplicate Is suitable, but the original and the copy cannot be distinguished, and it is insufficient as a technique for authenticating the article.

  Accordingly, the present inventors have described “a printed matter and a discrimination method capable of determining authenticity and a method of embedding information in the printed matter” (Patent Document 6), “a printed matter and discrimination method capable of determining authenticity, and the printed matter. According to the method of embedding information (Patent Document 7) and “Printed Material and Authentication Method of the Printed Material” (Patent Document 8), a print image line composed of a free curve group such as a background pattern and a colored pattern is mechanically generated. There has already been filed a printed matter characterized by identification. However, since these inventions are techniques applied to a chromatic pattern by line expression, they cannot be applied to a continuous gradation (photographic gradation) pattern.

Japanese Patent No. 4132122 Japanese Patent No. 4013450 JP 2008-207335 A Japanese Patent No. 4415542 Japanese Patent No. 4635160 JP 2003-200367 A Japanese Patent No. 4542924 WO2006 / 106677

Optical Security and Counterfeit Deterrence Techniques IV Vol.4677 (by SPIE-The International Society for Optical Engineering)

  Printed products that require anti-counterfeiting are required to have functionality that can resist counterfeiting in all situations, such as copying, duplication, and falsification. There is no anti-counterfeit print image line that enables discrimination, and it is necessary to provide a plurality of anti-counterfeit print image lines according to applications and purposes within a limited print area. Further, there are cases where the cost is increased by providing a plurality of printing areas for anti-counterfeit printing image lines according to applications and purposes. As a result, there has been a demand for an anti-counterfeit printed matter in which a plurality of anti-counterfeiting measures can be shared within a limited printing area and an authenticity determination means can be selected according to the user's specification environment and position.

  The anti-counterfeit printed matter of the present invention comprises a first image formed on a substrate with at least a first color ink, and a first image with a second lightness lower than the first color ink. A second image formed so that at least a part thereof overlaps, the first image having a predetermined interval set so that a frequency component corresponding to information to be embedded is extracted; The second image is formed by any one of I) to III), and I) has a first image line, a second image line, and a third image line, A region in which the first image line and the second image line, and the first image line and the second image line, which are arranged so as to face each other at the constant pitch along the direction 1, do not exist Is formed in the unit, and the unit has a constant pitch and the first direction and the first direction. The first image and the second image are formed at a pitch of ½ or approximately ½ of the unit pitch, and the first image in each unit When either one of the image line and the second image line is on, the other is off, and the area is the same or substantially the same, and the first image line causes the first invisible image to be Either a positive image or a negative image is formed, the second image line forms the negative image or the positive image of the first invisible image, and the third image line forms a visible image. II) Has a third drawing line, a fourth drawing line, and a fifth drawing line, and is arranged along the second direction so as to face the center at a constant pitch. The third image arranged in the area where the line and the fifth image line and the fourth image line and the fifth image line do not exist. Are formed in the unit, and the units are arranged in a matrix at a constant pitch in the first direction and the second direction orthogonal to the first direction, and are ½ or substantially ½ of the unit pitch. A fourth image and a fifth image are formed at a pitch of the first image line, the fourth image line and the fifth image line in each unit are in the relationship of being off when one is on, and the other is off. , The areas are the same or substantially the same, and either the positive image or the negative image of the second invisible image is formed by the fourth image line, and the negative image of the second invisible image or the negative image by the fifth image line The other of the positive images is formed and a visible image is formed by the third image line, or III) is the first image line, the second image line, the third image line, the fourth image line, and It has a 5th image line and faces the center along the first direction at a constant pitch. The first image line and the second image line arranged in this way, and a fourth direction arranged so as to oppose the center at a constant pitch along a second direction orthogonal to the first direction. The 3rd image line and the 5th image line and the 3rd image line arranged in the area where the 1st image line, the 2nd image line, the 4th image line, and the 5th image line do not exist are in the unit. The units are arranged in a matrix at a constant pitch in the first direction and in the second direction orthogonal to the first direction, and the units are arranged at a pitch of 1/2 or approximately 1/2 of the unit pitch. The first image and the second image are formed, and the fourth image and the fifth image are formed at a pitch of ½ or approximately ½ of the unit pitch. When one of the second image lines is on, the other is off, and the area is the same or substantially the same. When one of the image line and the fifth image line is on, the other is off, and the areas are the same or substantially the same. The first image line causes the first invisible image to be Either the positive image or the negative image is formed, the second image line forms the negative image or the positive image of the first invisible image, and the fourth image line forms the second invisible image positive image. Or a negative image is formed, a negative image or a positive image of the second invisible image is formed by the fifth image line, and a visible image is formed by the third image line. To do.

  In the case of I), the anti-counterfeit printed matter of the present invention has two units arranged adjacent to each other in the first direction, the first image line in one unit is on, and the other unit is in the other unit. When the second image line is turned on, and approximately 1.5 non-image areas of the unit are generated between the first image line and the second image line, the first image line And an area ratio of half or substantially half of the first image line or the second image line at the center between the image lines of the second image line and the density imbalance of the first invisible image having the same color The first line for relaxing the first density for relaxing is arranged, and three units arranged adjacent to each other in the first direction are arranged, and the central unit has the first line and the second line. Both lines are off, the first line in the unit adjacent to the center unit is on, the second line in the other unit When the line is turned on and approximately 1.5 non-image portions of the unit are generated between the image lines of the first image line and the second image line, the first image line and the second image line are generated. In order to alleviate the density imbalance of the first invisible image that is the same color as the half or substantially half of the first or second image area at the center between the image lines. An image line for reducing the second density is arranged, three units arranged adjacent to each other in the first direction, and the first image line and the second image line are both off in the central unit. The first line in the unit adjacent to one of the central units is on, the first line in the other unit is on, or in the unit adjacent to one of the central units The second drawing line of the second drawing line is turned on, the second drawing line in the other unit is turned on, and between the drawing lines of the first drawing line or the drawing of the second drawing line. When a non-image portion corresponding to approximately two units is generated between the first image line and the second image line, a half of the first image line or the second image line is centered between the image lines of the first image line or the second image line. Alternatively, an image area that reduces the first density and an image line that reduces the second density are arranged to reduce the density imbalance of the first invisible image having the same color area ratio and approximately the same color. In the case of II), two units arranged adjacent to each other in the second direction are such that the fourth drawing line in one unit is on and the fifth drawing line in the other unit is When it is turned on and a non-image portion of approximately 1.5 units of the unit is generated between the image lines of the fourth image line and the fifth image line, the fourth image line and the fifth image line In the center between the lines, the ratio of the area of the second or invisible half of the fourth line or the fifth line and the density of the second invisible image having the same color is uneven. A line for relaxing the third concentration for relaxing the balance is arranged, and three units arranged adjacent to each other in the second direction are arranged, and the fourth unit and the fifth are arranged in the central unit. Are turned off, the fourth drawing line in the unit adjacent to the central unit is turned on, the fifth drawing line in the other unit is turned on, and the fourth drawing line and the second drawing line are turned on. When a non-image portion corresponding to approximately 1.5 units is generated between the five image lines, the fourth image is centered between the fourth image line and the fifth image line. The image area ratio of the line or the fifth image line is half or substantially half the image area ratio, and the image line for reducing the fourth density for reducing the density imbalance of the second invisible image having the same color is arranged. , Three units arranged adjacent to each other in the second direction, the fourth and fifth lines are both off in the center unit, The fourth line in the unit adjacent to the center unit is on, the fourth line in the other unit is on, or the unit in the unit adjacent to the center unit is one The fifth drawing line is on, the fifth drawing line in the other unit is turned on, and the fourth drawing line or the fifth drawing line between the drawing lines of the fifth unit In the case where the image line portion is generated, the area ratio of the image line area of the fourth image line or the fifth image line is half or substantially half at the center between the image lines of the fourth image line or the fifth image line, and In the case of III), an image line for reducing the third density and an image line for reducing the fourth density are arranged to reduce the density imbalance of the second invisible image of the same color. Two units placed adjacent to each other in the direction of the When the second image line is turned on and a non-image area corresponding to approximately 1.5 units of the unit is generated between the first image line and the image line of the second image line, the first image line and In the center between the lines of the second image line, the image area ratio of the half of the first image line or the second image line is almost or substantially half, and the density imbalance of the first invisible image that is the same color. A line for relaxing the first density for relaxation is arranged, and three units arranged adjacent to each other in the first direction have a first line and a second line in the central unit. Both lines are off, the first line in the unit adjacent to the center unit is on, the second line in the other unit is on, the first line and the second line In the case where a non-image portion corresponding to approximately 1.5 units is generated between the image lines, the first image line is formed at the center between the image lines of the first image line and the second image line. Alternatively, the image area ratio of the second image line is reduced, or the image line area ratio of the second image line is reduced, and the image line for reducing the second density for reducing the density imbalance of the first invisible image having the same color is arranged. Three units arranged adjacent to each other in the first direction, the first image line and the second image line are both off in the central unit, and the unit adjacent to one side with respect to the central unit The first line in the first unit is on, the first line in the other unit is on, or the second line in the unit adjacent to the center unit is on, in the other unit When the second image line is turned on and approximately two non-image portions of the unit are generated between the image lines of the first image line or between the image lines of the second image line, The area ratio of the half or almost half of the first or second drawing line in the center between the drawing lines or the second drawing line, In addition, an image line for reducing the first density and an image line for reducing the second density for reducing the density imbalance of the first invisible image having the same color are arranged along the second direction. Two units placed adjacent to each other turn on the fourth drawing line in one unit, turn on the fifth drawing line in the other unit, and turn on the fourth drawing line and the fifth drawing line. When a non-image area corresponding to approximately 1.5 units of the unit is generated between the image lines, the fourth image line or the fifth image line is centered between the image lines of the fourth image line and the fifth image line. An image line that relaxes the third density for mitigating the density imbalance of the second invisible image that is the same color as the half or approximately the image area ratio of the image line is arranged in the second direction. 3 units arranged adjacent to each other in the center unit, both the fourth and fifth lines are off in the center unit. On the other hand, the fourth drawing line in the unit adjacent to one side is turned on, the fifth drawing line in the other unit is turned on, and the interval between the fourth drawing line and the drawing line of the fifth drawing line is When approximately 1.5 non-image portions are generated, the fourth image line or the fifth image line is half or approximately in the center between the image lines of the fourth image line and the fifth image line. An image line for reducing the fourth density for reducing the density imbalance of the second invisible image of the same color and the image area ratio of half is arranged, and adjacent to the second direction. In the three units arranged, both the fourth and fifth lines are off in the central unit, and the fourth line in the unit adjacent to the central unit is on. The fourth line in the other unit is on, or the fifth line in the unit adjacent to the center unit is on, the other When the 5th drawing line in the other unit is turned on, and there is a non-drawing part of approximately 2 units between the 4th drawing line or the 5th drawing line. A second or invisible second area that has the same or the same color area as half or substantially half of the fourth line or the fifth line at the center between the lines of the fourth line or the fifth line. An image line that relaxes the third density and an image line that relaxes the fourth density are arranged to alleviate the image density imbalance.

  In the forgery-preventing printed matter of the present invention, the first color ink is formed of yellow (Y) color ink, and the second color ink is cyan (C), magenta (M), and black (K) color ink. It is formed by at least one.

  In the case of I), the anti-counterfeit printed matter of the present invention is black (the first image line, the second image line, the image line that relaxes the first density, and the image line that relaxes the second density are black ( K) color ink, the third image line is formed with cyan (C) and / or magenta (M) color ink, and the concentric line is formed with yellow (Y) color ink. , II), the fourth image line, the fifth image line, the image line that reduces the third density, and the image line that reduces the fourth density are formed of black (K) color ink. , The third image line is formed with cyan (C) and / or magenta (M) color ink, and the concentric line is formed with yellow (Y) color ink. 1st drawing line, 2nd drawing line, 4th drawing line, 5th drawing line, drawing line for relaxing the first density, and drawing for reducing the second density The image line for reducing the third density and the image line for reducing the fourth density are formed of black (K) color ink, and the third image line is cyan (C) and / or magenta (M ), And the concentric lines are formed of yellow (Y) color ink.

  The third image line in the anti-counterfeit printed matter of the present invention is a concentric shape in which a visible image having a continuous tone is formed by one method selected from the size of the image line, the density of the image line, or the density of the image line. The line is characterized in that a visible image composed of continuous gradations is formed by continuously changing the line width of the concentric line.

  The printed matter for preventing forgery of the present invention is characterized in that the length of one side of the unit is 1 mm or less.

  The region where the concentric lines in the anti-counterfeit printed matter of the present invention are arranged is formed by any one of IV) to VI) shown below, and IV) is the area where the concentric lines are arranged. Each of the divided areas is formed with concentric lines that share the same center point, and the interval between the lines of the concentric lines in each of the divided areas is different for each area. , V), a region where the concentric lines are arranged is divided into a plurality of regions, and each of the regions divided into a plurality is divided into a plurality of regions each having a central point that is different for each region. The interval between the lines of the concentric lines in each region is different for each region, or VI), the region where the concentric lines are arranged is divided into a plurality of rings, and each of the divided regions is Concentric lines that share the same center point are formed, and the boundaries of each area divided into multiple parts In this case, an interpolating area consisting of the average value of the distance between the concentric lines in one adjacent area and the distance between the concentric lines in the other area is provided, and the continuity of the concentric lines at the boundary is provided. Is maintained.

  The printed matter for preventing forgery of the present invention is characterized in that the interval between the lines of concentric lines is smaller than the unit size and is 50 μm to 350 μm.

  The anti-counterfeit printed material manufacturing apparatus according to the present invention includes a concentric image input means for inputting a visible image of a printed material for forgery prevention and an image to be a concentric line motif, and an image to be a motif obtained by the image input means. Color separation means for color-separating into image data of a first color ink for forming into a shape line, and image data of a second ink for forming a visible image having a lightness lower than that of the first color ink; A first information input means for acquiring the first invisible image and / or the second invisible image and a concentric shape having a predetermined interval set so that frequency components corresponding to information to be embedded are extracted in advance. A second information input means for inputting line information; a first image line and a second image line are set in the first invisible image; and / or a fourth image line in the second invisible image and 5th line is set and each line is set A first information embedding unit configured to set the second color ink in one invisible image and / or the second invisible image, and generate the first invisible image data and / or the second invisible image data; Second information embedding means for setting concentric line information to image data of the color ink, and generating concentric line image data; first invisible image data and / or second invisible image data; , Image composition means for synthesizing the concentric line data and image data of the second ink for forming a visible image, and generating a document file, and the first color ink based on the document file And output means for printing on the base material with the second color ink.

  The anti-counterfeit printed material manufacturing apparatus according to the present invention includes a concentric image input means for inputting a visible image of a printed material for forgery prevention and an image to be a concentric line motif, and an image to be a motif obtained by the image input means. Color separation means for color-separating into image data of a first color ink for forming into a shape line, and image data of a second ink for forming a visible image having a lightness lower than that of the first color ink; A first information input means for acquiring the first invisible image and / or the second invisible image and a concentric shape having a predetermined interval set so that frequency components corresponding to information to be embedded are extracted in advance. A second information input means for inputting line information; a first image line, a second image line, an image line for relaxing the first density, and an image for relaxing the second density; Set a line and / or in a second invisible image The fourth image line, the fifth image line, the image line that relaxes the third density, and the image line that relaxes the fourth density are set, and the first invisible image and / or the first image where each image line is set. A first information embedding means for setting the second color ink to the two invisible images and generating the first invisible image data and / or the second invisible image data, and the image data of the first color ink are concentric. A second information embedding unit for setting information on the line and generating concentric line image data; first invisible image data and / or second invisible image data; concentric line data and visible Image combining means for generating a document file by combining the image data of the second ink for forming an image, and based on the first color ink and the second color ink based on the document file Equipped with output means that prints over the material And wherein the door.

  The apparatus for producing a forgery-preventing printed material of the present invention is such that the first color ink is formed of yellow (Y) color ink, and the second color ink is cyan (C), magenta (M), and black (K). It is formed of at least one of color inks.

  The method for producing an anti-counterfeit printed material according to the present invention includes a step of inputting a visible image of an anti-counterfeit printed material and an image to be a concentric line motif by an image input unit, and an image input unit by a color separation unit. The image data of the first color ink for forming the image to be the motif formed in concentric lines and the image data of the second ink for forming a visible image having a lightness lower than that of the first color ink. The frequency component corresponding to the information to be embedded in advance is obtained by the step of color separation, the step of acquiring the first invisible image and / or the second invisible image by the first information input, and the second information input means. A step of inputting information of concentric lines having a predetermined interval set so as to be extracted; and a first information embedding unit that adds a first image line and a first image line to the first invisible image; 2 and / or the second invisible image is set with the fourth and fifth image lines, and the first invisible image and / or the second image with each image line set. The step of setting the second color ink in the invisible image, generating the second invisible image data and / or the second invisible image data, and the image data of the first color ink by the second information embedding means Setting the information of the concentric lines, generating the concentric lines image data, and by the image composition means, the first invisible image data and / or the second invisible image data, the concentric lines data, and A step of generating a document file by combining the image data of the second ink for forming a visible image, and a first color ink and a second color based on the document file by the output means. Ink to substrate Characterized by the step of overlapping output Ri.

  The method for producing an anti-counterfeit printed material according to the present invention includes a step of inputting a visible image of an anti-counterfeit printed material and an image to be a concentric line motif by an image input unit, and an image input unit by a color separation unit. The image data of the first color ink for forming the image to be the motif formed in concentric lines and the image data of the second ink for forming a visible image having a lightness lower than that of the first color ink. The frequency component corresponding to the information to be embedded in advance is obtained by the step of color separation, the step of acquiring the first invisible image and / or the second invisible image by the first information input, and the second information input means. A step of inputting information of concentric lines having a predetermined interval set so as to be extracted; and a first information embedding unit, a first image line, , Set the image line for relaxing the first density and the image line for relaxing the second density, and / or set the fourth image line, the fifth image line, the third image line to the second invisible image. An image line for relaxing the density of the image and an image line for relaxing the fourth density are set, and the second color ink is set for the first invisible image and / or the second invisible image in which each image line is set. The step of generating the first invisible image data and / or the second invisible image data and the second information embedding means set the information of the concentric lines in the image data of the first color ink, and the concentricity. A second ink for forming the first invisible image data and / or the second invisible image data and the concentric line data and the visible image by the step of generating the shaped line image data and the image synthesis means; A document file by combining the image data of A step, by the output means, based on the document file, and having a step of outputting overlap printing on the substrate in a first color ink and the second color ink.

  In the method for producing a printed matter for preventing forgery of the present invention, the first color ink is formed of yellow (Y) color ink, and the second color ink is cyan (C), magenta (M), and black (K). It is formed of at least one of color inks.

  The anti-counterfeit printed matter of the present invention is provided with two kinds of a first authenticity determination method and a second authenticity determination method. As the first anti-counterfeit method, a determination tool is provided on the anti-counterfeit printed matter. The invisible image that appears by superimposing can be visually recognized, and as a second authenticity determination method, authenticity can be easily determined by a plurality of determination methods by looking at the invisible information extracted by the determination device. Can do. In addition, a plurality of anti-counterfeiting measures can be shared within a limited printing area, and authenticity determination means can be selected according to the user's specification environment and position. In addition, the visible image having the design property provided for the printed pattern in the anti-counterfeit printed matter of the present invention can express various beautiful expressions such as a continuous color image, a full color image, and a rainbow effect in addition to a single color pattern. When the invisible image is developed, the visibility is not hindered, and by overlaying the discriminating tool on the printed matter, the invisible image can be easily and clearly switched to the visible image.

  Furthermore, since the anti-counterfeit printed matter of the present invention can provide an anti-counterfeit effect by the shape and arrangement of the image line, it is excellent in cost performance, and the plate making and printing methods are not limited at all. There is an effect that there is a degree of freedom.

Explanatory drawing which can visually recognize the invisible image which appeared by superimposing the discrimination tool 2 on the printed matter 1, and can confirm the invisible information extracted by the discrimination device R as a second authenticity discrimination method. The detailed explanatory drawing which observed the printed pattern 3 of the printed matter 1 by visual observation under normal visibility conditions. When the discriminating tool 2 is superimposed on the printed matter 1 at a predetermined angle (which is 0 degree), the first invisible image 4 is expressed as a visible image, and the discriminating tool 2 is placed on the printed matter 1 at a predetermined angle. The figure which showed the state by which the 2nd invisible image 5 was expressed as a visible image when it overlapped with the angle which makes 90 degree | times with respect to. The print pattern 3 was obtained by subjecting the optical scanner to image input at a resolution of 1200 dpi and generating a 24-bit RGB image composed of 1024 × 1024 pixels and the Fourier transform of the B channel of the RGB image. The figure by which the FFT pattern was shown. The figure in which the center line 7 of each lens in the lenticular lens that is the discriminator 2 is placed at a predetermined position on the printed product so as to coincide with the center of the image line A. The figure in which the center line 7 of each lens in the lenticular lens which is the discriminator 2 is placed in a predetermined position on the printed product so as to coincide with the center of the image line B. A state in which the print pattern 3 is configured with two types of image line areas is shown, and a part of the print pattern 3 is partially enlarged in order to explain the image line configuration of the present invention in more detail, and FIG. 5 is a schematic diagram in which the image line E is represented by a black solid for easy explanation. The print pattern 3 was obtained by subjecting the optical scanner to image input at a resolution of 1200 dpi and generating a 24-bit RGB image composed of 1024 × 1024 pixels and the Fourier transform of the B channel of the RGB image. The figure by which the FFT pattern was shown. A state in which the print pattern 3 is configured with three types of image line areas is shown, and a part of the print pattern 3 is partially enlarged in order to explain the image line configuration of the present invention in more detail, and The schematic diagram which expressed the drawing line E by the black solid for easy explanation. The print pattern 3 was obtained by subjecting the optical scanner to image input at a resolution of 1200 dpi and generating a 24-bit RGB image composed of 1024 × 1024 pixels and the Fourier transform of the B channel of the RGB image. The figure by which the FFT pattern was shown. The printed pattern 3 is composed of three types of areas, and the center points P of the concentric circles of the areas a1, a2 and a3 are equal, and the areas a1, a2 and a3 are respectively the centers of the concentric circles. The schematic diagram arrange | positioned equally from the point P and equally divided into three. The printed pattern 3 is composed of three types of regions, the central points P of the concentric circles of the regions a1, a2 and a3 are different, and the regions a1, a2 and a3 have the same region area. The schematic diagram arrange | positioned. The printed pattern 3 is composed of three types of areas, and the center points P of the concentric circles of the areas a1, a2, and a3 are equal, and the ring shape is in the order of the area a1, area a2, and area a3 from the center point P. The schematic diagram arrange | positioned. The block diagram of the production apparatus which provides the information which should be embedded previously determined with respect to the continuous tone image of this invention. The flowchart of the production method which provides the information which should be embedded previously determined with respect to the continuous tone image of this invention. The figure in which the data table for selecting from the several sets of preset intervals for every information which should be embedded was shown. 6 is a flowchart illustrating a printed material authentication method according to the present invention. The schematic diagram which showed an example of the unit simply. The flowchart which showed the algorithm which performs deletion and addition of an image line for relieving that a density | concentration becomes unbalanced visually. FIG. 20 is a diagram showing a state in which the image line A ′ [h, v] of the unit [h, v] is deleted according to the algorithm of FIG. 19. FIG. 20 is a diagram showing a state in which an image line a having an image area that is half or substantially half of the image line A or the image line A ′ and an image line C are added according to the algorithm of FIG. 19. The schematic diagram which showed an example of the unit simply.

  Hereinafter, forgery prevention printed matter according to Embodiments 1 to 4 of the present invention will be described with reference to the drawings. However, the present invention is not limited to the first to fourth embodiments described below, and includes various other embodiments within the scope of the technical idea described in the claims. It is.

  The anti-counterfeit printed matter of the present invention comprises two types of a first authenticity determination method and a second authenticity determination method, and is shown in FIG. 1A as the first authenticity determination method. As shown in FIG. 1B, the invisible image that appears by superimposing the discriminator 2 on the printed material 1 can be visually recognized, and is extracted by the discriminator R as shown in FIG. By checking the invisible information, it is possible to easily determine authenticity.

  The forgery-preventing printed matter of the present invention uses at least two or more color inks having different brightness. Preferably, in the anti-counterfeit printed matter of the present invention, the first color ink is formed of yellow (Y) color ink, and the second color ink is cyan (C), magenta (M), and black (K). It is formed of at least one of color inks. The first authenticity determination method uses low-lightness color ink, and the second authenticity determination method uses high-lightness color ink. Here, the low brightness is preferably an L * a * b * color table system having an L value of 70 or more, and the high brightness is an L * a * b * color table system having an L value of 50 or less. However, this is only a guideline, and it is desirable that the color ink of the low lightness and the color ink of the high lightness are sufficiently effective if the L value of the L * a * b * color table system is at least 20 or more apart.

  The discriminating tool 2 of the first authenticity discrimination method is a line filter or a lenticular lens in which a plurality of straight lines are formed along a single line in a transparent filter. Here, a visible image is an image that can be visually recognized under normal visible light, and an invisible image cannot be visually observed under normal visible light, or is extremely visible. This is an image that is difficult to be viewed, and is visually recognized by overlapping a line filter or a lenticular lens. On the other hand, the discriminating device R of the second authenticity discriminating method is equipped with a reading means R1, an input means R2, an arithmetic means R3, and a display means R4 mainly composed of an optical scanner or the like. Thereby, the numerical invisible information calculated from the spatial frequency provided in the printed pattern 3 is obtained.

  FIG. 2 illustrates the image line of the printed matter 1 in more detail. As shown in FIG. 1 (a), when the printed pattern 3 of the printed matter 1 is visually observed under normal visibility conditions, as shown in FIG. A visible image of the printed pattern 3 is visually recognized. The printed pattern 3 of the printed matter 1 shown in FIG. 2 includes a plurality of regions in which cyan (C), magenta (M), and black (K) have a predetermined arrangement, as shown in the partial enlarged view in the circle of FIG. The image line D is composed of cyan (C) and magenta (M), and the image line A, image line A ′, image line B, and image line B ′ are black (K). It is configured. In the example of FIG. 2, the printed pattern 3 is composed of four colors of cyan (C), magenta (M), yellow (Y), and black (K). Among these, the first authenticity determination method is used. The lowest brightness color ink to be used is black (K), and the highest brightness color ink to be used in the second authenticity determination method is yellow (Y) in this case.

  The vertical dimension Sv and the horizontal dimension Sh shown in the partially enlarged view in the circle of FIG. 2 are, for example, 1 mm or less, such as 340 μm. A region surrounded by the vertical dimension Sv and the horizontal dimension Sh is a minimum unit called a unit, and the lightness is low due to the image line A, the image line A ′, the image line B, and the image line B ′. An invisible image is composed of color ink, for example, black (K). The image line A and the image line A ′ are arranged along the first direction so as to face the center, and the image line B and the image line B ′ are orthogonal to the first direction. It arrange | positions so that a center may be opposed along a 2nd direction. The image lines shown in the partially enlarged view in the circle of FIG. 2 are regularly arranged in a matrix in the first direction and the second direction orthogonal to the first direction at a constant pitch on the surface of the printed matter. . The image line A and the image line A ′ form a pair and are in an on / off relationship with each other. On the other hand, the image line B and the image line B 'form a pair and are in an on-off relationship with each other. The image line A and the image line A ′ have the same area, and the image line B and the image line B ′ have the same area. The presence of the image line A, the image line A ′, the image line B, and the image line B ′ is not visually recognized under normal visibility conditions, and the first invisible image (negative) is detected only by the image line A. Or positive), the first invisible image (positive or negative) is formed only by the image line A ′, and the second invisible image (negative or positive) by only the image line B and invisible only by the image line B ′. Each image (positive or negative) is formed.

  Further, a visible image (design: pattern) is formed by the drawing line D shown in the partially enlarged view in the circle of FIG. 2, and becomes a drawing line constituting a visible image of the printed pattern 3 composed of arbitrary figures and characters, The image line D is disposed so as to be sandwiched between the image line A, the image line A ′, the image line B, and the image line B ′. Further, the image line D is composed of cyan (C) and magenta (M) color inks, while the image line E is composed of yellow (Y) color inks. The arrangement is different from the positional relationship among B, the image line B ′, and the image line D. As shown in the circle of FIG. 2, the drawing line configuration of the drawing line E is composed of concentric circles having an interval d of 80 μm. The distance d is preferably smaller than the vertical dimension Sv and the horizontal dimension Sh, that is, the unit dimension. Although the drawing line configuration of drawing line E has been described with concentric circles, the present invention is not limited to this, and any concentric lines such as concentric angles may be used.

  The printed pattern 3 of the printed matter 1 shown in FIG. 2 is a unit in which units surrounded by a vertical dimension Sv and a horizontal dimension Sh are arranged continuously and regularly in a matrix without vertical and horizontal gaps. It is. There is no limit to the number of steps that the unit is repeated on the printed pattern 3, and the number of steps is proportional to the resolution of the visible and invisible images. However, in this state, in the vicinity of the units arranged in a matrix form, for example, both the image line A and the image line A ′ are turned on (colored), and thus the density is high (dark). ) And both the image line A and the image line a ′ are off (no coloration) in the vicinity of the unit where the image lines A and the image lines a ′ are arranged in a matrix. ), The density may appear low (light), and the density may appear unbalanced with the naked eye.

  In order to alleviate the appearance of this density imbalance, the image line a (image line that relaxes the first density), image line b (image line that relaxes the third density) and image shown in FIG. It is preferable to arrange the line C (the image line for relaxing the second density and the image line for relaxing the fourth density) in the area of the image line D, respectively. For example, the image line a is an image area that is half of the image line A or the image line A ′, arranged in the unit vertical direction, and arranged so as to be sandwiched between the image line A ′ and the image line A. Yes. On the other hand, the image line C has an image area that is half of the image line A or the image line A ′, arranged in the vertical direction of the unit, and arranged so as to be sandwiched between the image line A and the image line A ′. Yes. The image line b has an image area that is half of the image line B or the image line B ′, arranged in the horizontal direction of the unit, and arranged so as to be sandwiched between the image line B ′ and the image line B. Yes. On the other hand, the image line C has an image area that is half of the image line B or the image line B ′, arranged in the horizontal direction of the unit, and arranged so as to be sandwiched between the image line B and the image line B ′. Yes.

  The deletion and addition of the image line are executed for each unit [h, v] which is the minimum unit by the algorithm shown in FIG. In order to briefly explain the principle, only the vertical processing will be described. [V] is the number of steps when the unit is counted from the top, and [h] is the number of steps when the unit is counted horizontally. First, in process f1, the image line A [h, v] and the image line A ′ [h, v] are sequentially detected in the unit [h, v] for each column arranged in a matrix. Note that the method of detecting the image line A [h, v] and the image line A ′ [h, v] is, for example, in a unit to be processed when the print pattern 3 is a binary image in the bitmap format. The image line A [h, v] and / or the image line A ′ [h, v] may be identified by a process generally called labeling.

  Next, in process f2, the condition is satisfied that the unit [h, v] has the image line A ′ [h, v] and the unit [h, v + 1] has the image line A [h, v + 1]. Then, in process f3, the image line A ′ [h, v], which is the position where the unit [h, v] is originally arranged, is deleted. That is, as illustrated in FIG. 20A, when the unit [h, v], the unit [h, v + 1], and the unit [h, v + 2] are arranged, the image line A ′ [ h, v] and the image line A [h, v + 1] of the unit [h, v + 1] are adjacent to each other, as illustrated in FIG. 20B, the image line A ′ [ h, v] are deleted. If the condition of the process f2 is not met, the process proceeds to the process f4.

  Next, in process f4, the condition is satisfied that the unit [h, v] has the image line A [h, v] and the unit [h, v + 1] has the image line A ′ [h, v + 1]. In step f5, the image line a [h, v] in the unit [h, v] is added. That is, as shown in FIG. 21B, an image line a having an image area that is half of the image line A or the image line A ′ is between the unit [h, v] and the unit [h, v + 1]. Added. Thereby, the density imbalance in the naked eye between the unit [h, v] and the unit [h, v + 1] is alleviated. In addition, the half line area referred to in the present invention includes substantially half the line area.

  Next, in process f6, the unit [h, v] has the image line A ′ [h, v], the unit [h, v + 1] has no image line, and the unit [h, v + 2] has the image line. When the condition having the line A [h, v + 2] is met, the image line C [h, v + 1] in the unit [h, v + 1] is added in the process f7. That is, as shown in FIG. 21C, in the area adjacent to the position where the image line A [h, v + 1] of the unit [h, v + 1] is arranged, the image line A or half of the image line A ′. A drawing line C having a drawing area is added. Thereby, the density imbalance in the naked eye between the unit [h, v] and the unit [h, v + 2] is alleviated.

  Next, in process f8, the unit [h, v] has the image line A ′ [h, v], the unit [h, v + 1] has no image line, and the unit [h, v + 2] has the image line. When the condition having the line A ′ [h, v + 2] is met, the line C [h, v + 1] and the line a [h, v + 1] in the unit [h, v + 1] are added in the process f9. . That is, as shown in FIG. 21 (d), the half of the image line A or the image line A ′ is positioned adjacent to the area where the image line A [h, v + 1] of the unit [h, v + 1] is arranged. The image line C having the image line area is added, and at a position adjacent to the area where the image line A ′ [h, v + 1] of the unit [h, v + 1] is arranged, the image line A or half of the image line A ′. A drawing line a having a drawing line area is added. Thereby, the density imbalance in the naked eye between the unit [h, v] and the unit [h, v + 2] is alleviated. Also in the horizontal direction, the image line A is set to the image line B, the image line A ′ is replaced with the image line B ′, and the step number [v] is replaced with the step number [h]. Is done.

  Further, as shown in the partially enlarged view in the circle of FIG. 2, the image area ratio composed of the cyan (C) and magenta (M) color components in the image line D, and the yellow (Y The color expression is made by the area ratio of the image line consisting of the color components. At that time, the drawing line E is expressed by continuously changing the drawing line widths of the concentric circles.

  As the first true / false discrimination method, the discrimination tool 2 is superimposed on the printed matter 1 shown in FIG. 1 to easily express the first invisible image or the second invisible image to discriminate the authenticity. It is something that can be done. The discriminator 2 is a line filter, a lenticular lens, or the like in which a plurality of straight lines are formed along a single line in a transparent filter. When the printed pattern 3 of the printed product 1 is visually observed under normal visibility conditions without overlapping a line filter or a lenticular lens, as shown in FIG. 2, it consists of arbitrary figures, characters, photographic gradation images, etc. A visible image of the printed pattern 3 is visually recognized. Then, when the discriminating tool 2 is superimposed on the printed matter 1 at a predetermined angle (which is 0 degree), the first invisible image 4 as shown in FIG. To do. When the discriminating tool 2 is superimposed on the printed matter 1 with an angle of 90 degrees with respect to a predetermined angle, the second invisible image 5 as shown in FIG. 3B becomes a visible image. Expressed. The first invisible image 4 and the second invisible image 5 appear to be either negative or positive due to the relative position between the discriminator 2 and the printed material 1, and the scope of the effect of the present invention. Is within.

  In the above description, the first invisible image 4 and the second invisible image 5 are formed by the configuration of the image line A, the image line A ′, the image line B, and the image line B ′. The configuration of only the first invisible image by the image line A and the image line A ′ or the configuration of only the second invisible image by the image line B and the image line B ′ as shown in FIG. It may be. That is, it can be formed by any one of the following I) to III).

  I) has a first image line, a second image line, and a third image line, and is arranged in a first direction so as to face the center at a constant pitch along the first direction. The second image line and the second image line, and the third image line arranged in a region where the first image line and the second image line do not exist are formed in the unit, and the unit is formed at the first pitch at a constant pitch. And the second direction orthogonal to the first direction are arranged in a matrix, and the first image and the second image are formed at a pitch of 1/2 or approximately 1/2 of the unit pitch. The first drawing line and the second drawing line in each unit are in a relationship in which one of the first drawing line and the second drawing line is off, and the other is in the same or substantially the same area. To form either a positive image or a negative image of the first invisible image, and a negative of the first invisible image by the second image line. The other image or positive image is formed, a visible image is formed by the third image line.

  II) has a third image line, a fourth image line, and a fifth image line, and is arranged along the second direction so as to face the center at a constant pitch. And the fifth image line, and the third image line arranged in a region where the fourth image line and the fifth image line do not exist, are formed in the unit, and the unit has the first pitch at a constant pitch. And the second direction orthogonal to the first direction are arranged in a matrix, and the fourth image and the fifth image are formed at a pitch of 1/2 or approximately 1/2 of the unit pitch. The fourth drawing line and the fifth drawing line in each unit are in a relationship in which either one is on and the other is off, and the areas are the same or substantially the same, and the fourth drawing line Thus, either a positive image or a negative image of the second invisible image is formed, and a negative image of the second invisible image is formed by the fifth image line. Other image or positive image is formed, a visible image is formed by the third image line.

  III) has a first image line, a second image line, a third image line, a fourth image line, and a fifth image line, and is centered at a constant pitch along the first direction. The first image line and the second image line arranged so as to face the boundary, and the second direction perpendicular to the first direction so as to face the center at the constant pitch. The fourth and fifth image lines arranged, and the first image line, the second image line, the fourth image line, and the fifth image line are arranged in a region where there is no third image line. An image line is formed in the unit, and the units are arranged in a matrix at a constant pitch in the first direction and in the second direction orthogonal to the first direction. A first image and a second image are formed at a pitch of / 2, and a fourth image and a fifth image are formed at a pitch of 1/2 or approximately 1/2 of the unit pitch, The first image line and the second image line in each unit are in a relationship in which either one is on, the other is off, and the areas are the same or substantially the same. The fifth image line has a relationship in which either one is on, the other is off, and the area is the same or substantially the same. The first image line is a positive image or negative image of the first invisible image. One of the images is formed, the second image line forms the negative image or the positive image of the first invisible image, and the fourth image line forms the second image of the positive or negative image. Either one is formed, the negative image or the positive image of the second invisible image is formed by the fifth image line, and the visible image is formed by the third image line.

  An image line in which the concentration imbalance is alleviated can be formed by the following configuration in the cases I) to III) described above.

  In the case of I), two units arranged adjacent to each other in the first direction have the first image line in one unit turned on and the second image line in the other unit turned on. When there are approximately 1.5 non-image portions of the unit between the image lines of the first image line and the second image line, the image lines of the first image line and the second image line. The first density for reducing the density imbalance of the first invisible image having the same color and the half or substantially half of the area of the first image line or the second image line at the center between them The three lines arranged adjacent to each other along the first direction are arranged, and the first unit and the second line are both off in the central unit. The first drawing line in the unit adjacent to one of the two is turned on, the second drawing line in the other unit is turned on, and the first drawing line is turned on. And when the non-image portion corresponding to approximately 1.5 units is generated between the image lines of the second image line and the second image line, the first image is centered between the image lines of the first image line and the second image line. The image area of the second image line or the image area of the second image line is reduced to a half or approximately half of the image area, and the image line for reducing the second density for reducing the density imbalance of the first invisible image having the same color. Three units are arranged adjacent to each other in the first direction. The first unit and the second unit are both off in the central unit and adjacent to one of the central units. The first line in the selected unit is on, the first line in the other unit is on, or the second line in the unit adjacent to the center unit is on, The second drawing line in the other unit is turned on, and between the drawing lines of the first drawing line or between the drawing lines of the second drawing line is approximately two units. In the case where an image line portion has occurred, the area ratio of the image line area of the half of the first image line or the second image line at the center between the image lines of the first image line or the second image line; The image line for relaxing the first density and the image line for relaxing the second density are arranged to alleviate the density imbalance of the first invisible image having the same color.

  In the case of II), two units arranged adjacent to each other in the second direction have the fourth line in one unit turned on and the fifth line in the other unit turned on. When there are approximately 1.5 non-image portions of the unit between the image lines of the fourth image line and the fifth image line, the image lines of the fourth image line and the fifth image line are drawn. The third density for reducing the density imbalance of the second invisible image having the same color and the half or substantially half of the area of the fourth or fifth image at the center The three lines arranged adjacent to each other along the second direction are arranged, and the fourth unit and the fifth line are both off in the central unit. The fourth image line in the unit adjacent to one is turned on, the fifth image line in the other unit is turned on, and the fourth image line is turned on. And when the non-image area corresponding to about 1.5 units of the unit is generated between the image lines of the fifth image line and the fifth image line, the fourth image line is centered between the image lines of the fourth image line and the fifth image line. The image area for reducing the fourth density for alleviating the density imbalance of the second invisible image having the same color and the half or substantially half the image area ratio of the image line or the fifth image line. Three units arranged adjacent to each other in the second direction, the fourth and fifth lines are off at the center unit, and adjacent to one at the center unit The fourth line in the selected unit is on, the fourth line in the other unit is on, or the fifth line in the unit adjacent to the center unit is on, The fifth drawing line in the other unit is turned on, and between the drawing lines of the fourth drawing line or between the drawing lines of the fifth drawing line is approximately two units. In the case where a non-image area has occurred, the image area ratio of half or substantially half of the fourth image line or the fifth image line at the center between the image lines of the fourth image line or the fifth image line, In addition, an image line that relaxes the third density and an image line that relaxes the fourth density are arranged to mitigate the density imbalance of the second invisible image having the same color.

  In the case of III), two units arranged adjacent to each other in the first direction have the first image line in one unit turned on and the second image line in the other unit turned on. When there are approximately 1.5 non-image portions of the unit between the image lines of the first image line and the second image line, the image lines of the first image line and the second image line. The first density for reducing the density imbalance of the first invisible image having the same color and the half or substantially half of the area of the first image line or the second image line at the center between them The three lines arranged adjacent to each other along the first direction are arranged, and the first unit and the second line are both off in the central unit. The first image line in the unit adjacent to one is turned on, the second image line in the other unit is turned on, and the first In the case where approximately 1.5 non-image portions of the unit are generated between the image lines of the line and the second image line, the first image line and the second image line are centered between the image lines of the second image line. Image area ratio for reducing the second density for alleviating the density imbalance of the first invisible image having the same color as the half or substantially half the image area ratio of the first image line or the second image line The three units arranged adjacent to each other in the first direction are turned off in the center unit, and the first and second lines are both off in the center unit, and on one side with respect to the center unit. The first line in the adjacent unit is on, the first line in the other unit is on, or the second line in one unit adjacent to the center unit is on The second drawing line in the other unit is turned on, and there are approximately two units between the drawing lines of the first drawing line or between the drawing lines of the second drawing line. In the case where the non-image portion of the image is generated, the area ratio of the half or substantially half of the first image line or the second image line at the center between the image lines of the first image line or the second image line. And an image line for reducing the first density and an image line for reducing the second density for reducing the density imbalance of the first invisible image having the same color are arranged along the second direction. Two units arranged adjacent to each other, the fourth drawing line in one unit is turned on, the fifth drawing line in the other unit is turned on, and the fourth drawing line and the fifth drawing line are turned on. When a non-image portion corresponding to about 1.5 units of the unit is generated between the image lines, the fourth image line or the fifth image line is centered between the image lines of the fourth image line and the fifth image line. The image area for reducing the third density for alleviating the density imbalance of the second invisible image having the same color and the area ratio of half or substantially half of the image line of Three units arranged adjacent to each other in the second direction, the fourth and fifth lines are off at the center unit, and adjacent to one at the center unit The fourth drawing line in the selected unit is turned on, the fifth drawing line in the other unit is turned on, and the interval between the fourth drawing line and the drawing line of the fifth drawing line is approximately 1.5 units. In the case where a non-image portion of a minute occurs, a half or substantially half of the image area of the fourth image line or the fifth image line at the center between the image lines of the fourth image line and the fifth image line The image lines for reducing the fourth density for reducing the density imbalance of the second invisible image having the same color and the same color are arranged, and three lines arranged adjacently along the second direction are arranged. When the unit is in the center unit, both the fourth and fifth lines are off. The fourth line in the other unit is on, the fourth line in the other unit is on, or the fifth line in the unit adjacent to the center unit is on, the other unit When the fifth image line is turned on and a non-image area corresponding to approximately two units is generated between the image lines of the fourth image line or between the image lines of the fifth image line, The density of the second invisible image having the same color as the area ratio of half or substantially half of the fourth or fifth drawing line at the center between the drawing lines or the fifth drawing line An image line for relaxing the third density and an image line for relaxing the fourth density are arranged to alleviate the imbalance.

As a second authenticity determination method, the printed pattern 3 shown in FIG. 2 is inputted by an optical scanner at a resolution of 1200 dpi, and has a 24-bit configuration of 1024 × 1024 pixels shown in FIG. An RGB image is generated. The image lines E included in the printed pattern 3 on the printed matter shown in FIG. 2 are arranged as concentric circles having an interval d _{1 of} 80 μm, and the concentric circles forming the image line E are thin lines and lightness. Since it is printed with high yellow (Y) color ink, it cannot be visually recognized that it is composed of concentric circles. Furthermore, since the image lines A, A ′, B, B ′ and D having low brightness are simultaneously overprinted, they become camouflage patterns, and the concentric circles constituting the image line E are It is not visually recognized. The image line A, the image line A ′, the image line B, the image line B ′, and the image line D have a shape different from that of the concentric circle line composed of frequency components different from the frequency component of the concentric circle line forming the image line E. Formed by a group of strokes. FIG. 4B is an FFT pattern obtained by Fourier transform of the B channel in the RGB image shown in FIG. In addition, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed and displayed in the fourth quadrant of the FFT pattern in FIG. As shown in frequency intensity graph of FIG. 4 (b), the inverse spatial distance q _d1 intensity peaks are observed. This is the result of the interval d shown in FIG. 2 appearing on the inverse space. With respect to the inverse spatial distance of the intensity peak on the FFT pattern, various parameters relating to image input, that is, when the interval d of 80 μm provided in the area a1 on the printed matter shown in FIG. If the number of pixels on one side and the resolution of the image are known, it can be easily calculated by equation (1).

Since the RGB image of FIG. 4A includes the image line E shown in FIG. 2, the inverse spatial distance q _d1 of the intensity peak caused by the interval d ₁ between the image lines of the concentric circles included in the image line E is As shown in FIG. 4B, it appears at a position of 271 pixels from the center of the FFT pattern. In addition, the image line A, the image line A ′, the image line B, the image line B ′, and the image line D are in the area surrounded by the vertical dimension Sv and the horizontal dimension Sh, that is, in the unit. The inverse spatial distance q _v of the intensity peak caused by the dimension Sv of the pixel appears at a position of 64 pixels from the center of the FFT pattern as shown in FIG. Furthermore, inverse spatial distance q _h intensity peak transverse dimension Sh results will appear in the center of the 64 pixel positions of the FFT patterns as shown in Figure 4 (b). In this way, the image line E, the image line A, the image line A ′, the image line B, the image line B ′, and the image line D are prominently displayed as different spatial frequencies.

(1) Embodiment 1
In the first embodiment, the image line configuration related to the first authenticity determination method and the second authenticity determination method will be described more specifically. 5 and 6 are schematic views in which a part of the printed pattern 3 is partially enlarged in order to explain the image line configuration of the present invention in more detail. The image line A, the image line A ′, the image line B, the image line B ′, and the image line D are in a region surrounded by the vertical dimension S and the horizontal dimension S, that is, in the unit. , And are formed of concentric circles that form an interval d.

  First, as a first authenticity determination method, as shown in FIG. 5A, the center line 7 of each lens in the lenticular lens as the determination tool 2 is at the predetermined position on the printed material. Place it so that it matches the center. In this case, as shown in FIG. 5B, the image line A is enlarged by the action of the lenticular lens, so that the first invisible image “A” formed by the image line A is displayed. The character can be confirmed. At this time, the image line D constituting the visible image does not coincide with the center line 7 of each lens of the lenticular lens, and is not viewed from directly above the discriminator 2. Further, when the center line 7 of each lens of the discriminator 2 is moved along the vertical axis direction so as to coincide with the center of the image line A ′ so that the image line A ′ is enlarged, the image line A ′. The first invisible image visually recognized by is negatively inverted and visually recognized. Also, the image line A and the image line A ′ are printed with black (K) color ink with low brightness, and the image line E is printed with yellow (Y) with high lightness. Yellow (Y) in the lens is hardly visually recognized due to the difference in brightness, and is not affected at all by the first authenticity determination method. Furthermore, the distance d is shorter than the dimension S for effectively operating the second authenticity determination method.

  Further, as a first authenticity determination method, as shown in FIG. 6A, the center line 7 of each lens in the lenticular lens that is the determination tool 2 is set to the image line B at a predetermined position on the printed matter. Place it so that it matches the center. In this case, as shown in FIG. 6B, the image line B is enlarged by the action of the lenticular lens, so that the second invisible image “B” formed by the image line B is displayed. The character can be confirmed. At this time, the image line D constituting the visible image does not coincide with the center line 7 of each lens of the lenticular lens, and is not viewed from directly above the discriminator 2. Further, when the center line 7 of each lens of the discriminator 2 is moved along the vertical axis direction so as to coincide with the center of the image line B ′ so that the image line B ′ is enlarged, the image line B ′. The second invisible image visually recognized by is negatively positive-reversed and visually recognized. Also, the image line B and the image line B ′ are printed with black (K) color ink with low brightness, and the image line E is printed with yellow (Y) with high lightness. Yellow (Y) in the lens is hardly visually recognized due to the difference in brightness, and is not affected at all by the first authenticity determination method. Furthermore, the distance d is shorter than the dimension S for effectively operating the second authenticity determination method.

  Here, the discriminator 2 is not limited to a lenticular lens, and for example, the same effect can be obtained even if it is a line filter. In the case of this line filter, the portion corresponding to the line on the filter hides the lines that make up the visible image, so that only the lines that make up the invisible image can be confirmed. May not be concealed and may be slightly visible. However, since this does not impair the effect of the present invention, it is sufficient to use a line filter for simple discrimination.

  The image line D constituting the visible image has a design property and is known as a monochrome pattern, a halftone dot, a relative photographic gradation colored with an appropriate gray scale density, a random dot dither method, and the like. It is possible to apply a continuous tone image composed of the following expression method. That is, a meaningful visible image having continuous gradation is not particularly limited as long as it has continuous gradation from highlight to shadow, such as a face image, letters, numbers, designs, pictures, logo marks, etc. . Visible images are not particularly limited, such as letters, numbers, designs, designs, logo marks, and the like. In addition, when forming printed matter that requires identity verification, such as identification cards and admission tickets, the face image should be a meaningful visible image with continuous gradation, and the invisible image should be personal information or the date of issue. Is preferred. The printing method of the anti-counterfeit printed matter having continuous gradation according to the present invention is not particularly limited, such as an ink jet printer, a laser printer, and an offset printer. The substrate of the anti-counterfeit printed material having continuous gradation according to the present invention is not particularly limited, such as paper and plastic.

(2) Embodiment 2
The second embodiment is a measure for increasing the amount of invisible information in the second authenticity determination method. FIG. 7 shows a state in which the printed pattern 3 is composed of two types of image line regions. In order to explain the image line structure of the present invention in more detail, a part of the printed pattern 3 is partially illustrated. It is the schematic diagram which expressed the image line E by the black solid so that it might expand and it was easy to explain.

The printed pattern 3 composed of the two types of image area shown in FIG. 7 is inputted by an optical scanner at a resolution of 1200 dpi, and is 24 bits consisting of 1024 × 1024 pixels shown in FIG. 8A. RGB images are generated. Area a1 of the image consisting of the high brightness of the color ink is on the printed matter 1 shown in FIG. 7 are arranged in concentric line screen consisting distance d ₁ of 80 [mu] m, area a2 is concentric consisting distance d ₂ of 100μm The concentric circles that are arranged as lines and that constitute the regions a1 and a2 are printed with a thin line and color ink with high brightness, so that it cannot be visually recognized that they are composed of concentric circles. Further, since the image line A, the image line A ′, the image line B, the image line B ′, and the image line D having low brightness are simultaneously overprinted, they become a camouflage pattern, and the concentric circles constituting the regions a1 and a2 are formed. The line is never visible. The image line A, the image line A ′, the image line B, the image line B ′, and the image line D are formed by frequency components different from the frequency components of the concentric circles forming the image line E. Note that the distance d ₁ and the distance d ₂ are preferably smaller than the dimension S.

FIG. 8B is an FFT pattern obtained by Fourier transforming the B channel of the RGB image shown in FIG. As in FIG. 4, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed on the fourth quadrant of the FFT pattern in FIG. 8B. As shown in the frequency intensity graph of FIG. 8B, the inverse spatial distance q _d1 and the inverse spatial distance q _d2 of the intensity peak can be seen.

As shown in the calculation of Equation 1, the RGB image in FIG. 8A includes the area a1 shown in FIG. 7, and therefore the interval d ₁ between the lines of concentric lines in the area a1 is set. The resulting inverse spatial distance q _d1 of the intensity peak appears at a position of 271 pixels from the center of the FFT pattern, as shown in FIG. 8B. Furthermore, because it includes also the area a2 shown in FIG. 7 is an RGB image of FIG. 8 (a), inverse spatial distance q intensity peaks resulting spacing d ₂ of streaking concentric parallel line provided in the region a2 _As shown in FIG. 8B, _d2 appears at a position of 217 pixels from the center of the FFT pattern.

  FIG. 9 shows a state in which the printed pattern 3 is configured with three types of image line regions. A part of the printed pattern 3 is partially illustrated in order to explain the image line configuration of the present invention in more detail. It is the schematic diagram which expressed the image line E by the black solid so that it might enlarge easily and it might be easy to explain.

The printed pattern 3 composed of the three areas shown in FIG. 9 is input by an optical scanner at a resolution of 1200 dpi, and is a 24-bit RGB image consisting of 1024 × 1024 pixels shown in FIG. Is generated. Area a1 of the image consisting of the high brightness of the color ink is on the printed matter 1 shown in FIG. 9 are arranged in concentric line screen consisting distance d ₁ of 80 [mu] m, area a2 is concentric consisting distance d ₂ of 100μm are arranged in parallel line, region a3 are arranged in concentric line screen consisting distance d ₃ of 130 .mu.m, region a1, the concentric parallel line constituting the area a2 and the region a3 and subfraction line, a high brightness color inks Since it is printed, it cannot be visually recognized that it is composed of concentric lines. Furthermore, since the image line A, the image line A ′, the image line B, the image line B ′, and the image line D having low brightness are simultaneously overprinted, they become a camouflage pattern, and constitute the region a1, the region a2, and the region a3. The concentric circles are not visible. The image line A, the image line A ′, the image line B, the image line B ′, and the image line D are formed by frequency components different from the frequency components of the concentric circles forming the image line E. Note that the distance d ₁ , the distance d _2, and the distance d ₃ are preferably smaller than the dimension S of the unit.

FIG. 10B is an FFT pattern obtained by Fourier transforming the B channel in the RGB image shown in FIG. Similarly to FIG. 4 or FIG. 8, in order to explain the feature of the spatial frequency in an easy-to-understand manner, a frequency intensity graph is superimposed on the fourth quadrant of the FFT pattern in FIG. As shown in the frequency intensity graph of FIG. 10B, the inverse spatial distance q _d1 , inverse spatial distance q _d2, and inverse spatial distance q _d3 of the intensity peak can be seen.

As shown in the calculation of Equation 1, since the RGB image in FIG. 10A includes the region a1 shown in FIG. 9, the interval d ₁ between the lines of concentric lines in the region a1 is set. The resulting inverse spatial distance q _d1 of the intensity peak appears at a position of 271 pixels from the center of the FFT pattern as shown in FIG. Furthermore, Figure 10 since the RGB image of (a) also includes regions a2 shown in FIG. 9, the inverse spatial distance q intensity peaks resulting spacing d ₂ of streaking concentric parallel line provided in the region a2 _As shown in FIG. 10B, _d2 appears at a position of 217 pixels from the center of the FFT pattern. Furthermore, because it includes also the area a3 shown in FIG. 9 is the RGB image of FIG. 10 (a), the inverse spatial distance intensity peaks resulting interval d ₃ streaks concentric parallel line provided in the region a3 q _d3 appears at a position of 167 pixels from the center of the FFT pattern as shown in FIG.

Also, FIG. 11 is composed of three types of regions, as in the schematic diagram of FIG. 10, and similarly to the image line E of FIG. 9, a region a1 arranged with concentric circles having an interval d _{1 of} 80 μm, and 100 μm a distance d ₂ region a2 arranged concentric line screen consisting of, it is constituted by the arrangement region a3 concentric line screen consisting distance d ₃ of 130 .mu.m. As shown in the schematic diagram of FIG. 11, the center points P of the concentric circles of the regions a1, a2, and a3 are equal, and the regions a1, a2, and a3 are the centers of the concentric circles. The points P are equally divided into three equal parts. Even in this case, the spatial frequency characteristics of the region a1, the region a2, and the region a3 can be clearly identified.

  That is, in the forgery-preventing printed matter using the concentric circles in FIGS. 9 and 11, the region where the concentric circles are arranged is divided into a plurality of regions, and each of the divided regions shares the same center point. Concentric circles are formed, and the interval between the lines of the concentric circles in each of the divided regions is different for each region.

Further, FIG. 12 is similar to the schematic diagram of FIG. 9 and FIG. 11, the three consists kinds of regions, like the streaked E in FIG. 11, regions arranged in concentric line screen consisting distance d ₁ of 80 [mu] m a1 When a region a2 arranged in concentric line screen consisting distance d ₂ of 100 [mu] m, it is composed of an area a3 that are arranged in concentric line screen consisting distance d ₃ of 130 .mu.m. As shown in the schematic diagram of FIG. 12, the center points P of the concentric circles of the region a1, the region a2, and the region a3 are different, and each of the region a1, the region a2, and the region a3 has the same region area. Is arranged. Even in this case, the spatial frequency characteristics of the region a1, the region a2, and the region a3 can be clearly identified.

  That is, in the printed matter for preventing forgery using the concentric circles in FIG. 12, the region where the concentric circles are arranged is divided into a plurality of regions, and each of the divided regions has a different center point for each region. Concentric circles are formed, and the interval between the lines of the concentric circles in each of the divided regions is different for each region.

Incidentally, FIG. 9, each of the regions shown in the schematic diagram of FIG. 11 and FIG. 12, as shown in the first embodiment, the center of each individual streaked range intervals d ₁ of concentric parallel line Continuous gradation is expressed by continuously changing the line width from the line.

  In the above description, an image line E composed of concentric circles is formed on yellow (Y), which is a predetermined color element having the highest brightness, and the remaining pigments, cyan (C) and magenta (M), are moved from a predetermined position. However, the present invention is not limited to the above configuration, and a predetermined color element having the highest brightness is extracted from the plurality of color elements, and the predetermined color element is extracted from the predetermined color element. What is necessary is just to form so that the frequency component according to the information which should be embedded by the image which consists of may be extracted. Moreover, it is preferable that the space | interval of the drawing line of a concentric circle line is 50 micrometers-350 micrometers.

  In the printed matter for preventing forgery of the present invention, the interval between the lines of concentric circles is selected from a plurality of preset intervals set for each piece of information to be embedded. For example, as shown in the data table of FIG. 16, Code 1 is applied as data for obtaining the FFT pattern shown in FIG. 4B, and the FFT pattern shown in FIG. Code 2 is applied as data for obtaining, and Code 3 is applied as data for obtaining the FFT pattern shown in FIG. The more information that should be embedded in this data table is registered, the more information for authenticity determination can be utilized.

  The present invention has a concentric line in the area of surface expression, that is, a plurality of fine lines having regularity, so that it can be identified in a high-resolution input image by a digital device such as a scanner or a copying machine. By adding fine and regular parts that are difficult for humans to visually recognize, analyzing the correlation of the intervals between line drawings for securities on the digital device, and identifying the information embedded in the printed material The authenticity can be determined, and an action such as operation stop of a digital device such as a copying machine used for counterfeiting can be performed based on the information.

(3) Embodiment 3
The third embodiment describes a positional relationship in which a plurality of regions are arranged in a ring shape, and the concentric circles provided in each region have natural continuity at the boundary between the regions. is there. The third embodiment will be described in detail with reference to the drawings.

Since the concentric circles provided in the region of the present invention are printed with a color ink with high brightness such as yellow (Y), the line shape can be identified even if the entire continuous tone can be visually recognized. is not. However, it can be further prevented from being identified by the positional relationship of the image lines. Although FIG. 13 looks like a concentric circle formed at the same distance from the center point P, it is actually composed of three types of regions as in the schematic diagrams of FIGS. 9, 11 and 12. . As with streaked E of FIG. 9, the area a1 arranged concentric line screen consisting distance _{d 1} of 80 [mu] m, an area a2 arranged concentric line screen consisting distance _{d 2} of 100 [mu] m, distance 130 .mu.m _{d 3} And a region a3 arranged with concentric circles.

In the schematic diagram of FIG. 13A, the center points P of the concentric circles in the regions a1, a2, and a3 are equal, and the region a1, the region a2, and the region a3 are arranged in a ring shape in this order from the center point P. It has been done. First, the region a1 is a concentric line screen formed from the center point P at an interval d _1. Outside the region a1, concentric parallel line spacing d ₁ and the region a2 interpolation interval X ₁ is provided consisting of the average value of the distance d ₂ between concentric parallel line region a2 in regions a1 is arranged in a ring. Region a2 is concentric line screen formed with a spacing d _2. Outside the region a2, concentric parallel line spacing d ₂ and interpolation interval X ₂ is provided a region a3 made from the average value of the distance d ₃ of concentric parallel line region a3 of region a2 are arranged in a ring. Region a3 is concentric line screen formed with a spacing d _3.

On the other hand, in the schematic diagram of FIG. 13B, the center points P of the concentric circles of the region a3, the region a2, and the region a1 are equal to each other, and the ring shape is in order from the center point P to the region a3, the region a2, and the region a1. Is arranged. First, the area a3 is concentric line screen formed with a spacing d ₃ from the center point P. Outside the region a3, concentric parallel line distance d ₃ and interpolation interval X ₂ is provided a region a2 consisting of the average value of the distance d ₂ between concentric parallel line region a2 in regions a3 are arranged in a ring. Region a2 is concentric line screen formed with a spacing d _2. Outside the region a2, concentric parallel line distance d ₂ and the region a1 interpolation interval X ₁ is provided consisting of the average value of the distance d ₁ between concentric parallel line region a1 of region a2 are arranged in a ring. Region a1 is a concentric line screen formed with a spacing d _1.

  As a result, in the image line configurations of FIGS. 13A and 13B, the regions a1, a2, and a3 are arranged in a ring shape in order, but concentric circles are naturally formed at the boundaries of the regions. Continuity is maintained. Further, the image line configurations in FIGS. 13A and 13B are the same, and the spatial frequency characteristics of the region a1, the region a2, and the region a3 can be clearly identified.

Incidentally, each of the regions shown in the schematic diagram of FIG. 13 (a) and FIG. 13 (b), as shown in the first embodiment, each individual picture in a range of distance d ₁ of the concentric parallel line Continuous gradation is expressed by continuously changing the line width from the center line of the line.

  That is, in the printed matter for preventing forgery using the concentric circles in FIG. 13, the area where the concentric circles are arranged is divided into a plurality of rings, and the divided areas share the same center point. Interpolation area consisting of the average value of the distance between the concentric circles in one of the adjacent areas and the distance between the concentric circles in the other area at the boundary of each divided area where concentric circles are formed And the continuity of concentric circles at the boundary is maintained.

(4) Embodiment 4
As described in the first to third embodiments, the present invention gives predetermined information to be embedded to a continuous tone image. In the fourth embodiment, a manufacturing apparatus is used. A manufacturing method will be described.

  As shown in the block diagram of FIG. 14, the manufacturing apparatus according to the fourth embodiment includes an image input unit M1, a first information input unit M2, a second information input unit M3, an output unit M4, a display unit M5, An editing unit M6, a format database M7, and a communication interface M8 are provided. The editing unit M6 includes a color separation unit M6a, a first information embedding unit M6b, a second information embedding unit M6c, and an image composition unit M6d.

  The image input means M1 receives a visible image of a printed material for preventing forgery and an image serving as a concentric circle motif. The image input means M1 is a camera, a digital camera, a scanner, or the like, and is not particularly limited. Visible information can be obtained from a personal information database in which personal information registered in the same personal computer as a format database to be described later is input, an external database server in which personal information is input in advance through a communication interface, or the like.

  The first information input means M2 is input from a keyboard or the like, or a database in which invisible information of an image or text registered in the same personal computer as the format database M7 described later is input, and invisible information in advance by the communication interface M8. The first invisible image and / or the second invisible image can be obtained from an external database server to which is input.

  The second information input means M3 inputs information on concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded are extracted. For example, input from a keyboard or the like, a database (not shown) in which information registered in the same personal computer as the format database M7 described later is input, information to be embedded predetermined by a communication interface is input Information can be obtained from an external database server (not shown). Note that a database in which information registered in the same personal computer is input is provided in storage means (not shown), and has a predetermined interval set so that frequency components corresponding to information to be embedded are extracted. Information on concentric lines is stored.

  The output means M4 writes out a document file that can be held as a plurality of color channels, or the document file has a predetermined color ink (for example, cyan (C), magenta (M), yellow (Y), and black (K)). Is printed on the base material. The format of the document file is not particularly limited.

  The display means M5 is not particularly limited, such as a personal computer monitor or a dedicated monitor.

  The color separation means M6a receives the image data of the first color ink for forming the image as the motif obtained by the image input means M1 into concentric lines, and the visible image having a lightness lower than that of the first color ink. Color separation is performed on the image data of the second ink to be formed.

  The first information embedding unit M6b sets the first image line (image line A), the second image line (image line A ′) in the first invisible image, and / or the second invisible image. A fourth image line (image line B) and a fifth image line (image line B ′) are set. A second color ink (predetermined color element having low lightness) is set on the first invisible image and / or the second invisible image in which each image line is set, and the first invisible image data and / or the second Generate invisible image data. In the first invisible image and / or the second invisible image, for example, a time stamp such as an issue date is used as embedded information, and input from the first information input means M2, for example, input from the keyboard or communication information from the communication interface M8. Get in. When forming an image line for reducing the density, the first information embedding unit M6b adds the first image line (image line A), the second image line (image line A ′) to the first invisible image, An image line (a) for relaxing the first density and an image line (C) for relaxing the second density are set, and / or a fourth image line (image line B), An image line 5 (image line B ′), an image line (b) for relaxing the third density, and an image line (C) for relaxing the fourth density are set. A second color ink (predetermined color element having low lightness) is set on the first invisible image and / or the second invisible image in which each image line is set, and the first invisible image data and / or the second Generate invisible image data.

  The second information embedding unit M6c corresponds to the information to be embedded in the image data of the first color ink (predetermined color element with the highest brightness) to be formed into concentric lines by the color separation unit M6a. Information on concentric circles having a predetermined interval set so that frequency components are extracted is input by the second information input means M3 to generate concentric circle data. At least one image line group data different from the concentric circles is generated in the image data of the second ink for forming a visible image having a lightness lower than that of the first color ink.

  The image synthesizing means M6d includes the first invisible image data and / or the second invisible image data, the concentric line data (the predetermined color element having the highest brightness), and the second ink for forming the visible image. Are combined with the image data (line group data) to generate a document file. For example, the concentric circle line data in which the color element having the highest brightness is the yellow component, the line group data of the magenta component and the line group data of the cyan component, and the first invisible image and / or the second The document file is generated by synthesizing the image component group data of the black component to which the invisible image is applied.

  The format database M7 stores necessary data in addition to the color image input unit M1, the first information input unit M2, and the second information input unit M3. Specifically, for example, a card mount pattern is sent to the editing unit M6, and is synthesized with the print pattern 3, the print image 4, or the print image 5 by the image synthesis unit M6d.

  The communication interface M8 is RS-232C, IEEE1394, or the like, and is not particularly limited.

  The manufacturing method according to the present embodiment is executed by the processing steps shown in the flowchart of FIG. 15 using the manufacturing apparatus shown in FIG.

  First, in step f1, a visible image of an anti-counterfeit printed matter of the present invention and an image serving as a concentric circle motif are input by the image input means M1. For example, a bitmap multi-valued image is input, and there is no limitation on the image storage format, the number of pixels, and the like. Furthermore, the color separation of the visible image shown in step f4 and the image serving as a concentric circle motif is performed by the color separation means M6a included in the editing means M6 shown in FIG. In step f4, the color separation means M6a performs color separation into a predetermined color channel on which a visible image and a concentric circle line motif image can be printed, and a first image for forming the motif image line into a concentric line. Color separation is performed into image data of color ink (color element having the highest brightness) and image data of the second ink (remaining pigment) for forming a visible image having a lightness lower than that of the first color ink.

  Next, in step f3, the first information input means M2 constructs an invisible image arranged in the areas of the image line A, the image line A ′, the image line B, and the image line B ′ shown in FIG. Is done. Further, when forming an image line that relaxes the density, the image line that relaxes the first density, the image line that relaxes the second density, the image line that relaxes the third density, and the fourth density are relaxed. Set the image line to be used. The construction into an invisible image is performed by the image synthesis means M6d included in the editing means M6 shown in FIG.

  Next, in step f7, an image line A, an image line A ', an image line B, and an image line B' are generated. The image line is generated by the image synthesizing unit M6d included in the editing unit M6 shown in FIG.

  Next, in step f2, information on concentric circles having a predetermined interval set so that a frequency component corresponding to information to be embedded is extracted by the second information input means M3 is input. For example, information to be input is input from a keyboard or the like, or a database (not shown) in which information registered in the same personal computer as the format database M7 is input, and information is input in advance by the communication interface M8. Information can be obtained from an external database server (not shown). Note that a database in which information registered in the same personal computer is input is provided in storage means (not shown), and has a predetermined interval set so that frequency components corresponding to information to be embedded are extracted. Information on concentric lines is stored.

  Further, the second information embedding unit M6c included in the editing unit M6 shown in FIG. 14 generates an image line D which is image line group data formed by the cyan image and the magenta image in step f5. In step f6, concentric circle line data is generated for a predetermined color element having the highest brightness of the extracted information. For example, the image line E for the yellow image defined by the input information to be embedded is generated.

  Next, in steps f8 to 10, each channel is output to a predetermined color element having the highest brightness obtained by color separation in step f4 and the remaining pigment. Next, in steps f12 to 14, each channel output produced in steps f8 to 10 is applied to each image line. For example, the cyan image is output to the cyan channel of the document file in step f8, and the magenta image obtained by the color separation of step f4 is output to the magenta channel of the document file in step f9. The yellow image obtained by the color separation in step f4 is output to the yellow channel of the document file in step f10. Further, the black image obtained by generating the image line A, the image line A ′, the image line B, and the image line B ′ in step f7 is output to the black channel of the document file in step f11.

  The image line D obtained in step f5 is applied to the cyan channel in step f12, and is applied to the magenta channel in step f13. Further, the image line E obtained in step f6 is applied to the yellow channel in step f14. On the other hand, the image line A, the image line A ′, the image line B, and the image line B ′ obtained in step f7 are applied to the black channel in step f15.

  Next, the image synthesizing means M6d included in the editing means M6 shown in FIG. 14 sets the concentric circle line data set to the predetermined color element having the highest brightness and the predetermined color element having the lowest brightness. The image line A, the image line A ′, the image line B, and the image line B ′ are combined with at least one image line group data set for the remaining pigment to generate a document file. For example, the channels are synthesized at step f16 and written to the document file at step f17. The document file generated in this way is printed on the base material with the respective color inks, so that a color printed matter in which information is embedded can be obtained.

(5) Embodiment 5
The authentication method according to the present embodiment is executed by the processing steps shown in the flowchart of FIG. 17 using the determination device R shown in FIG.

  As shown in FIG. 17, in step f18, a printing image in which predetermined information to be embedded is embedded is read as a color image (RGB image) by reading means R1 such as a digital camera or an optical scanner. For example, reading is performed as an RGB image with a high resolution of 1200 dpi and an image size of 1024 × 1024 pixels.

  As step f19, the grayscale image of the color element with the highest brightness is extracted from the color image (RGB image) read in step f18. For example, a B (blue) channel grayscale image is extracted.

  In step f20, the gray scale image (for example, B (blue) channel) extracted in step f19 is Fourier-transformed by a conversion means (not shown) included in the calculation means R3 to generate an FFT pattern.

  In step f21, frequency components are extracted from the FFT pattern created in step f20 by an analysis unit (not shown) included in the calculation unit R3.

  As step f22, the frequency component extracted by the determination means (not shown) included in the calculation means R3 and the authenticity determination data (frequency component) stored in the storage means (not shown) included in the calculation means R3. ) Is verified, forgery prevention printed matter is authenticated.

  Since the frequency component is a component of a region formed by concentric circles, it is possible to extract a frequency component that is clearer than before, so erroneous recognition of a predetermined frequency component in comparison verification There is nothing to do.

DESCRIPTION OF SYMBOLS 1 Printed matter 2 Discriminator 3 Print pattern 4 Invisible image 5 Invisible image 7 Center line A Image line B Image line A 'Image line B' Image line C Image line D Image line E Image line a1 Area a2 Area a3 Area d Interval d ₁ distance _{d 2} distance _{d 3} intervals M1 color image input unit M2 first information input means M3 of the second information input means M4 output means M5 display means M6 editing means M6a color separating means M6b first information embedding means M6c second Information embedding means M6d Image composition means M7 Format database M8 Communication interface P Center point q _d1 Inverse space distance q _d2 Inverse space distance q _d3 Inverse space distance q _h Inverse space distance q _v Inverse space distance R Discriminator R1 Reading means R2 Input means R3 calculation means R4 display means S dimension Sh dimension Sv dimension X ₁ interpolation interval X ₂ interpolation interval

Claims (14)

A first image formed with at least a first color ink on a substrate and a second color ink having a lightness lower than that of the first color ink so that at least a part of the first image overlaps. Comprising a second image formed on
The first image is formed of concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded are extracted,
The second image is formed by any one of I) to III),
The I) has a first image line, a second image line, and a third image line, and is arranged so as to face the center at a constant pitch along the first direction. The first image line and the second image line, and the third image line arranged in a region where the first image line and the second image line do not exist are formed in the unit, and the unit Are arranged in a matrix in the first direction and in a second direction orthogonal to the first direction at a constant pitch, and the first and second pitches are ½ or substantially ½ the pitch of the unit. One image line and the second image line are formed, and when one of the first image line and the second image line in each unit is on, the other is off. And the area is the same or substantially the same, and the first invisible image is a positive or negative image of the first invisible image. Either one is formed, the other negative image or positive image of the first invisible image by the second image lines are formed, a visible image is formed by the third image line,
The II) has a third image line, a fourth image line, and a fifth image line, and is disposed so as to face the center at a constant pitch along the second direction. The fourth image line and the fifth image line, and the third image line arranged in a region where the fourth image line and the fifth image line do not exist are formed in the unit, and the unit Are arranged in a matrix in the first direction and in a second direction orthogonal to the first direction at a constant pitch, and the first and second pitches are ½ or substantially ½ the pitch of the unit. 4 and 5th lines are formed, and when one of the 4th line and the 5th line in each of the units is on, the other is off. And the same or substantially the same area, and a positive or negative image of the second invisible image by the fourth image line. One is formed of, the other negative image or positive image of the fifth image line by the second invisible image is formed, a visible image is formed by the third image line, or,
III) has a first image line, a second image line, a third image line, a fourth image line, and a fifth image line, and at a constant pitch along the first direction. The first image line and the second image line arranged so as to face each other with the center as a boundary, and the second direction perpendicular to the first direction, with the center at a constant pitch. The fourth image line and the fifth image line, and the first image line, the second image line, the fourth image line, and the fifth image line arranged so as to face each other. The third drawing line arranged in the non-existing area is formed in the unit, and the unit is arranged in a matrix at a constant pitch in the first direction and in the second direction orthogonal to the first direction. The first image and the second image line are formed at a pitch of ½ or approximately ½ of the pitch of the unit, and the pitch of the unit is increased. The fourth image and the fifth image line are formed at a pitch of ½ or substantially ½ of the first image line and the second image line in each of the units. Is on, the other is off, and the areas are the same or substantially the same. When either one of the fourth line and the fifth line is on, the other is off. And the area is the same or substantially the same, and either the positive image or the negative image of the first invisible image is formed by the first image line, and the second image line The other of the negative image or the positive image of the first invisible image is formed, and either the positive image or the negative image of the second invisible image is formed by the fourth image line, and the fifth image line The other of the negative or positive image of the second invisible image is formed, An anti-counterfeit printed matter characterized in that the visible image is formed by the third image line. In the case of I), two units arranged adjacent to each other in the first direction have the first image line in one of the units turned on, and the first in the other unit has the first 2 is turned on, and approximately 1.5 non-image portions of the unit are generated between the first image line and the second image line. The first invisible that has the same or the same color as the half of the first image line or the second image line at the center between the image line and the image line of the second image line. An image line for reducing the first density for reducing the density imbalance of the image is arranged,
The three units arranged adjacent to each other in the first direction have the first unit line and the second unit line off in the central unit, with respect to the central unit. The first image line in the unit adjacent to one of the units is turned on, the second image line in the other unit is turned on, and the image of the first image line and the second image line is turned on. When a non-image portion corresponding to approximately 1.5 units of the unit is generated between the lines, the first image line or the center of the first image line and the second image line is centered between the first image line and the second image line. The image area ratio of the second image line is half or substantially half, and the image line for relaxing the second density for reducing the density imbalance of the first invisible image having the same color is arranged. ,
The three units arranged adjacent to each other in the first direction have the first unit line and the second unit line off in the central unit, with respect to the central unit. The first image line in the unit adjacent to one side is on, the first image line in the other unit is on, or the one adjacent to the central unit is The second image line in the unit is turned on, the second image line in the other unit is turned on, and the space between the image lines of the first image line or between the image lines of the second image line is When approximately two non-image portions of the unit are generated, the first image line or the second image is centered between the image lines of the first image line or the second image line. The line area ratio of half or substantially half of the line, and the density imbalance of the first invisible image that is the same color It streaked to alleviate the image line and the second concentration to alleviate the first concentration to mitigate is arranged,
In the case of II), two units arranged adjacent to each other in the second direction are such that the fourth drawing line in one of the units is on, and the fourth line in the other unit is on. 5 is turned on, and approximately 1.5 non-image portions of the unit are generated between the fourth image line and the image line of the fifth image line. In the center between the image line and the image line of the fifth image line, the second invisible image area ratio that is half or substantially half of the fourth image line or the fifth image line, and the same color. An image line is arranged to mitigate a third density to mitigate image density imbalance,
The three units arranged adjacent to each other in the second direction have the fourth image line and the fifth image line turned off in the central unit, with respect to the central unit. The fourth drawing line in the unit adjacent to one side is turned on, the fifth drawing line in the other unit is turned on, and the fourth drawing line and the fifth drawing line are drawn. When a non-image portion of approximately 1.5 units of the unit is generated between the lines, the fourth image line or the center of the fourth image line and the image line of the fifth image line An image area for reducing the density of the second invisible image having the same color as that of the half or substantially half of the image area of the fifth image line and an image line for relaxing the fourth density are arranged. ,
The three units arranged adjacent to each other in the second direction have the fourth image line and the fifth image line turned off in the central unit, with respect to the central unit. The fourth line in the unit adjacent to one side is on, the fourth line in the other unit is on, or the one adjacent to the center unit is the one The fifth drawing line in the unit is turned on, the fifth drawing line in the other unit is turned on, and there is a gap between the drawing lines of the fourth drawing line or between the drawing lines of the fifth drawing line. When approximately two non-image portions of the unit are generated, the fourth image line or the fifth image line is centered between the image lines of the fourth image line or the fifth image line. The line area ratio of half or almost half of the line, and the density imbalance of the second invisible image that is the same color It streaked to alleviate the image line and the fourth concentration to mitigate the third concentration to mitigate is arranged,
In the case of III), the two units arranged adjacent to each other in the first direction are such that the first image line in one of the units is on and the first line in the other unit is on. 2 is turned on, and approximately 1.5 non-image portions of the unit are generated between the first image line and the second image line. The first invisible that has the same or the same color as the half of the first image line or the second image line at the center between the image line and the image line of the second image line. An image line for reducing the first density for reducing the density imbalance of the image is arranged,
The three units arranged adjacent to each other in the first direction have the first unit line and the second unit line off in the central unit, with respect to the central unit. The first image line in the unit adjacent to one of the units is turned on, the second image line in the other unit is turned on, and the image of the first image line and the second image line is turned on. When a non-image portion corresponding to approximately 1.5 units of the unit is generated between the lines, the first image line or the center of the first image line and the second image line is centered between the first image line and the second image line. The image area ratio of the second image line is half or substantially half, and the image line for relaxing the second density for reducing the density imbalance of the first invisible image having the same color is arranged. ,
The three units arranged adjacent to each other in the first direction have the first unit line and the second unit line off in the central unit, with respect to the central unit. The first image line in the unit adjacent to one side is on, the first image line in the other unit is on, or the one adjacent to the central unit is The second image line in the unit is turned on, the second image line in the other unit is turned on, and the space between the image lines of the first image line or between the image lines of the second image line is When approximately two non-image portions of the unit are generated, the first image line or the second image is centered between the image lines of the first image line or the second image line. The line area ratio of half or substantially half of the line, and the density imbalance of the first invisible image that is the same color It streaked to alleviate the image line and the second concentration to alleviate the first concentration to mitigate is arranged,
In the two units arranged adjacent to each other in the second direction, the fourth drawing line in one unit is turned on, and the fifth drawing line in the other unit is turned on. In the case where approximately 1.5 non-image portions of the unit are generated between the image lines of the fourth image line and the fifth image line, the fourth image line and the fifth image line In the center between the strokes, the density ratio of the second invisible image having the same color or the half or substantially half the stroke area ratio of the fourth stroke or the fifth stroke. An image line for relaxing the third density for relaxation is arranged,
The three units arranged adjacent to each other in the second direction have the fourth image line and the fifth image line turned off in the central unit, with respect to the central unit. The fourth drawing line in the unit adjacent to one side is turned on, the fifth drawing line in the other unit is turned on, and the fourth drawing line and the fifth drawing line are drawn. When a non-image portion of approximately 1.5 units of the unit is generated between the lines, the fourth image line or the center of the fourth image line and the image line of the fifth image line An image area for reducing the density of the second invisible image having the same color as that of the half or substantially half of the image area of the fifth image line and an image line for relaxing the fourth density are arranged. ,
The three units arranged adjacent to each other in the second direction have the fourth image line and the fifth image line turned off in the central unit, with respect to the central unit. The fourth line in the unit adjacent to one side is on, the fourth line in the other unit is on, or the one adjacent to the center unit is the one The fifth drawing line in the unit is turned on, the fifth drawing line in the other unit is turned on, and there is a gap between the drawing lines of the fourth drawing line or between the drawing lines of the fifth drawing line. When approximately two non-image portions of the unit are generated, the fourth image line or the fifth image line is centered between the image lines of the fourth image line or the fifth image line. The line area ratio of half or almost half of the line, and the density imbalance of the second invisible image that is the same color Wherein the third concentration claim 1 anti-counterfeit printed matter according to streaking to alleviate streaking and the fourth concentration to relax, characterized in that the formed by placing for relaxing. The first color ink is formed of yellow (Y) color ink;
3. The forgery-preventing printed matter according to claim 1, wherein the second color ink is formed of at least one of cyan (C), magenta (M), and black (K) color inks. In the case of I), the first image line, the second image line, the image line that relaxes the first density, and the image line that relaxes the second density are black (K) colors. The third image line is formed of cyan (C) and / or magenta (M) color ink, and the concentric line is formed of yellow (Y) color ink;
In the case of II), the fourth image line, the fifth image line, the image line that relaxes the third density, and the image line that relaxes the fourth density are black (K) colors. The third image line is formed of cyan (C) and / or magenta (M) color ink, and the concentric line is formed of yellow (Y) color ink;
In the case of III), the first image line, the second image line, the fourth image line, the fifth image line, the image line for relaxing the first density, the second image line, The image line that relaxes the density, the image line that relaxes the third density, and the image line that relaxes the fourth density are formed of black (K) color ink, and the third image line is cyan. 4. The method according to claim 1, wherein the concentric lines are formed of yellow (Y) color ink, and the concentric lines are formed of color ink of (C) and / or magenta (M). 5. The printed matter for preventing forgery described.   As the third image line, a visible image composed of continuous gradation is formed by one method selected from the size of the image line, the density of the image line, or the density of the image line, and the concentric lines are The forgery prevention printed matter according to any one of claims 1 to 4, wherein a visible image having a continuous tone is formed by continuously changing the line width of the figure line.   6. The forgery-preventing printed matter according to claim 1, wherein a length of one side of the unit is 1 mm or less. The region where the concentric lines are arranged is formed by any one of IV) to VI) shown below,
In the above IV), a region where the concentric lines are arranged is divided into a plurality of areas, and each of the divided areas is formed with concentric lines sharing the same central point, The interval between the lines of the concentric lines in each region is different for each region,
In V), a region where the concentric lines are arranged is divided into a plurality of regions, and each of the divided regions has a central point that is different for each region, and a concentric line is formed. The interval between the lines of the concentric lines in each of the divided areas is different for each of the areas, or VI), the area where the concentric lines are arranged is divided into a plurality of rings, Concentric lines that share the same center point are formed in each of the divided areas, and at the boundary of each of the divided areas, the distance between the concentric lines in one of the adjacent areas An interpolating area having an average value with an interval between the concentric lines in the other area is provided, and the continuity of the concentric lines is maintained at the boundary. The printed matter for preventing forgery according to any one of the above.   The printed matter for preventing forgery according to any one of claims 1 to 7, wherein the interval between the lines of the concentric lines is smaller than the dimension of the unit and is 50 µm to 350 µm. An apparatus for producing an anti-counterfeit printed matter according to any one of claims 1 to 8,
Image input means for inputting the visible image of the anti-counterfeit printed matter and an image to be a motif of the concentric lines;
The image data of the first color ink for forming the motif image obtained by the image input means on the concentric lines and the visible image having a lightness lower than that of the first color ink are formed. Color separation means for color-separating into image data of the second color ink for
First information input means for acquiring a first invisible image and / or a second invisible image;
Second information input means for inputting information on concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded in advance are extracted;
Setting the first image line and the second image line in the first invisible image and / or setting the fourth image line and the fifth image line in the second invisible image; The second color ink is set in the first invisible image and / or the second invisible image in which each image line is set, and the first invisible image data and / or the second invisible image is set. First information embedding means for generating data;
A second information embedding unit configured to set information on the concentric lines in the image data of the first color ink and generate concentric lines image data;
The first invisible image data and / or the second invisible image data, the concentric line data, and the image data of the second color ink for forming the visible image are combined to generate a document file. Image composition means for generating
An anti-counterfeit printed material producing apparatus comprising output means for printing on a substrate with the first color ink and the second color ink based on the document file. An apparatus for producing a forgery-preventing printed matter according to any one of claims 2 to 8,
Image input means for inputting the visible image of the anti-counterfeit printed matter and an image to be a motif of the concentric lines;
The image data of the first color ink for forming the motif image obtained by the image input means on the concentric lines and the visible image having a lightness lower than that of the first color ink are formed. Color separation means for color-separating into image data of the second color ink for
First information input means for acquiring a first invisible image and / or a second invisible image;
Second information input means for inputting information on concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded in advance are extracted;
Setting the first image line, the second image line, the image line for relaxing the first density and the image line for relaxing the second density in the first invisible image, and / or The fourth image line, the fifth image line, the image line that relaxes the third density, and the image line that relaxes the fourth density are set in the second invisible image, and each image line is set. The first color ink is set in the first invisible image and / or the second invisible image, and the first invisible image data and / or the second invisible image data is generated. Information embedding means,
A second information embedding unit configured to set information on the concentric lines in the image data of the first color ink and generate concentric lines image data;
The first invisible image data and / or the second invisible image data, the concentric line data, and the image data of the second color ink for forming the visible image are combined to generate a document file. Image composition means for generating
An anti-counterfeit printed material producing apparatus comprising output means for printing on a substrate with the first color ink and the second color ink based on the document file. The first color ink is formed of yellow (Y) color ink;
11. The forgery-preventing printed matter according to claim 9, wherein the second color ink is formed of at least one of cyan (C), magenta (M), and black (K) color inks. apparatus. An anti-counterfeit printed matter comprising image input means, color separation means, first information input means, second information input means, first information embedding means, second information embedding means, image composition means and output means A method for producing an anti-counterfeit printed matter according to any one of claims 1 to 7, using a production apparatus,
Inputting the visible image of the anti-counterfeit printed matter and the image that is the motif of the concentric lines by the image input means;
Image data of the first color ink for forming the image as the motif obtained by the image input means on the concentric lines by the color separation means, and lightness lower than that of the first color ink Color-separating into image data of a second color ink for forming the visible image of
Obtaining a first invisible image and / or a second invisible image by the first information input;
A step of inputting information of concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded in advance are extracted by the second information input means;
The first information embedding means sets the first image line and the second image line in the first invisible image, and / or the fourth image line and the second invisible image. The 5th image line is set, the 2nd color ink is set to the 1st invisible image and / or the 2nd invisible image in which each image line was set, and the 1st invisible image data And / or generating the second invisible image data;
Setting the concentric line information in the image data of the first color ink by the second information embedding means, and generating concentric line image data;
By the image composition means, the first invisible image data and / or the second invisible image data, the concentric line data and the image data of the second color ink for forming the visible image. Compositing to generate a document file;
Production of an anti-counterfeit printed matter comprising the step of printing the first color ink and the second color ink on the base material by the output means on the basis of the document file. Method. An anti-counterfeit printed matter comprising image input means, color separation means, first information input means, second information input means, first information embedding means, second information embedding means, image composition means and output means A method for producing an anti-counterfeit printed matter according to any one of claims 1 to 7, using a production apparatus,
Inputting the visible image of the anti-counterfeit printed matter and the image that is the motif of the concentric lines by the image input means;
Image data of the first color ink for forming the image as the motif obtained by the image input means on the concentric lines by the color separation means, and lightness lower than that of the first color ink Color-separating into image data of a second color ink for forming the visible image of
Obtaining a first invisible image and / or a second invisible image by the first information input;
A step of inputting information of concentric lines having a predetermined interval set so that frequency components corresponding to information to be embedded in advance are extracted by the second information input means;
The first information embedding means adds the first image line, the second image line, the image line that relaxes the first density, and the image that relaxes the second density to the first invisible image. A line is set and / or the second invisible image is the fourth image line, the fifth image line, the image line that relaxes the third density, and the image line that relaxes the fourth density The second color ink is set in the first invisible image and / or the second invisible image in which each image line is set, and the first invisible image data and / or the second invisible image is set. Generating invisible image data;
Setting the concentric line information in the image data of the first color ink by the second information embedding means, and generating concentric line image data;
By the image composition means, the first invisible image data and / or the second invisible image data, the concentric line data and the image data of the second color ink for forming the visible image. Compositing to generate a document file;
Production of an anti-counterfeit printed matter comprising the step of printing the first color ink and the second color ink on the base material by the output means on the basis of the document file. Method. The first color ink is formed of yellow (Y) color ink;
The forgery prevention printed matter according to claim 12 or 13, wherein the second color ink is formed of at least one of cyan (C), magenta (M), and black (K) color inks. Method.

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