JP2664338B2 - Image processing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image processing apparatus for creating and storing color correction data. 2. Description of the Related Art Conventionally, in the case of a copying apparatus in which a document is read by an image sensor constituted by a CCD or the like, variations in characteristics between each bit of the CCD, a decrease in light amount due to a lens, or a light amount itself It is necessary to correct shading that occurs due to the lack of uniformity of the image. In particular, in an image processing apparatus in which a projected image is obtained by transmitting a film through a film projecting material, and the projected image is read, not only the light source and the optical system are different from those described above, but also In the above case, the standard film corresponding to the standard white plate for the reflection original is not constant depending on the type of the negative film, and a reference film for shading correction must be prepared for each type of the film. Therefore, in this type of image processing apparatus, the reference film for obtaining shading correction data must be replaced with the original film every time a projected original is read. This has been a complicated task for the operator. Further, when there are many original films of the same type, even if shading correction data is acquired using one reference film,
The color of the reference film changes due to light and heat,
As a result, the shading correction data fluctuates, so that the reading may be performed without the shading correction of the projected image being performed accurately. In consideration of this point, it was necessary to prepare a large number of reference films for shading correction. [0006] Similar problems also occur in other devices such as color copiers. SUMMARY OF THE INVENTION An object of the present invention is to focus on the above-mentioned conventional problems, and to solve the problem, color correction data corresponding to an arbitrary color correction condition created is stored in association with a comment. It is an object of the present invention to provide an image processing apparatus which does not need to generate color correction data every time and can easily select color correction data. In order to achieve the above object, the present invention provides a means for creating color correction data for performing color correction according to an arbitrary color correction condition, Input means for inputting a comment indicating the color correction data; storage means for storing the color correction data created by the creation means in association with the comment input by the input means; And a color correction processing means for performing a color correction process based on the color correction data corresponding to the comment selected by the selection means. Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a configuration example of a control circuit according to an embodiment of the present invention. Here, reference numeral 101 denotes a CCD image sensor as reading means for converting a reflected image from a document or a projected image from a film into an electric signal. Reference numerals 102, 103 and 104 denote sample-and-hold circuits for holding the red (R), green (G) and blue (B) image signals sequentially and successively output from the CCD sensor 101 in a temporally separated manner. Reference numerals 105, 106 and 107 denote amplifiers for amplifying the separated image signals to predetermined values, respectively. Reference numerals 108, 109 and 110 denote A / D converters for converting the analog image signals from the amplifiers 105, 106 and 107 into digital image signals. . Reference numerals 111, 112 and 113 denote memories for storing digital image signals obtained from the respective A / D converters 108, 109 and 110 in order to perform shading correction.
Reference numeral 114 denotes a control device having a CPU function and performing control as described later. An operation unit 115 includes a data input unit 125 such as a keyboard for operating a copying machine (not shown), a display unit 126 for displaying a message, a projection mode selection switch 127, and a shading button 128. When sampling data based on the shading correction reference film, the operation unit 115 can store the type name and comment of the negative film in the memory 123 and simultaneously display them. It is also possible to correct these data via the operation unit 115. Reference numeral 116 denotes a memory for storing shading correction data and the like obtained from a negative film to be read as described later. Numerals 117, 118 and 119 are digital / analog (D / A) converters for generating signals for changing the gains in the amplifiers 105, 106 and 107 in accordance with the data on the negative film from the control unit 114. A / D converters 108, 10
This is an arithmetic unit for performing an operation for shading correction on each digital image signal from 9 and 110. FIG. 2 shows an example of a negative film projection device and a reading device according to the present invention. Here, reference numeral 202 denotes a glass table, which enables the CCD sensor 101 shown in FIG. 1 to be moved in the direction of the arrow along the back side of the glass table 202. While the CCD sensor 101 moves in the direction of the arrow, an image projected onto the glass table 202 from above or an image on a document (not shown) placed on the glass table 202 can be read.
203 is the film held in the film holder 204, 205
Is a light source for projecting light onto the film 203, 206 is a lens system for enlarging and focusing, 207 is a reflecting mirror, 208 is disposed on the glass base 202, and is a reflecting mirror via the lens system 206
This is a Fresnel lens that changes the direction of the light beam reflected by 207 so that the light beam enters the CCD sensor 201 perpendicularly. Now, when copying is performed based on a certain negative film, a reference film for shading correction corresponding to the negative film is set in the film holder 204, whereby the color characteristic unique to the negative film is obtained. The shading correction including the correction is performed as follows. In the film holder 204, both a negative film and a reference film for shading correction can be set. Next, an example of a control procedure for performing such correction will be described with reference to FIG. First, when the reference film for shading correction is set in the film holder 204 as described above, a predetermined light amount is set in order to sample and store the three colors of R, G and B in the reference film. Irradiates the reference film, and the CCD sensor 101 reads the image signal. At this time, R, G and B
These amplifiers are controlled via D / A converters 117, 118 and 119 so that the gains in the amplifiers 105, 106 and 107 are equal. Thus each amplifier 105,106 and
A / D conversion of the R, G and B color image signals obtained from
After A / D conversion by the converters 108, 109 and 110, these digital image signals are written into the memories 111, 112 and 113, respectively. Since the data sampled in this way is affected by lack of storage bits in the CCD sensor 101, flaws or dust of the shading correction reference film, it is preferable to perform sampling a plurality of times. It is. The shading correction data obtained by averaging the results of such multiple samplings is stored in the memory 116 for each color. At this time, data on the amount of light irradiated on the shading correction reference film, that is, film color data, is also stored in the memory 116.
Shall be stored at the same time. Next, when the above-mentioned sampling is completed, the reference film for shading correction is removed from the film holder 204, and several samplings are carried out in the same manner as in the above-mentioned sampling while the film is left empty without film. Then, as data without the reference film for shading correction, data for each color for R, G and B and data for the light amount are stored in the memory 116. If light irradiation is performed without a film as described above, the amount of light incident on the CCD sensor 101 increases as compared with when a film is set.
The input voltage may be higher than the convertible voltage of the D converters 108 to 110. Therefore, in such a case, the light quantity of the light source 205 is adjusted, and then the above-described sampling without a film may be performed. Now, as described above, the reference data is prepared in advance in both the state of the reference film for shading correction and the state without the film, and thereafter, the shading correction is performed on the negative film for image projection. In this case, there is no need to use a reference film for shading correction. That is, first, the actual light quantity from the light source 205 is set based on the data obtained from the CCD sensor 101 without inserting the negative film for image projection without the negative film. The memory 116 stores shading correction reference data obtained from light transmitted through the shading correction reference film, and light amount reference data obtained from the state without the reference film. Therefore, the control unit 114 determines, based on the actually obtained light amount,
From the reference data for light quantity in the memory 116, the amplifiers 105, 106
By adjusting the gains of the amplifiers 105, 106, and 107, the output from the amplifiers 105, 106, and 107 without the negative film is equal to the output of the amplifiers 105, 106, and 107 obtained without the reference film when the reference data was created. To be. As a result, these amplifiers 105 and 106 at the time of creating the reference data and at the time of the current shading correction, respectively.
The control unit 114 corrects the shading correction reference data read from the memory 116 based on the ratio of these gains. As a result, shading correction reference data corrected in accordance with the light amount corresponding to the actual color of the film is obtained.
These shading correction reference data are stored in memories 111 and 11
2 and 113, the shading correction operation unit 120,
121 and 122, respectively, where A /
The digital image signal of each color channel from the D converters 108, 109 and 110 is subjected to shading correction operation to extract a shading corrected image signal. By using a random access memory that can be backed up by a battery or the like or a programmable read-only memory that can electrically change the contents as the memory 116 for storing the above-mentioned reference data, the stored contents can be stored as it is. Make it possible. In order to be able to handle various types of negative films, the operation unit 115 stores the type names and comments of these negative films in the memory 123.
In selecting the shading correction reference data for a desired negative film, the film name is displayed by inputting the type name of the negative film from the input unit of the operation unit 115, and the control unit 114 displays the film type. Is read out from the memory 116. That is, when actually copying a negative film, for example, in the operation unit 115, first, the switch 12
7 Select the projection mode. Then, when a button 128 for instructing shading correction is depressed, a film selection mode is entered, and a registration menu is displayed in this state. By selecting a film name of the negative film from those menus or inputting the film name from the input unit, the control unit 114 stores the memory 11
From step 6, reference data for the negative film for performing shading correction is read. Next, as described above, the amplifier gain is adjusted according to the amount of light without the negative film, and then the shading correction reference data is corrected, whereby the shading correction can be automatically performed. FIG. 3 shows another embodiment of the present invention. In the embodiment of FIG. 1, the amplifiers 105, 106 and
By controlling the gain of 107, that is, adjusting the color of the negative film in the state of the analog signal,
In this example, amplifiers 305 to 30 corresponding to amplifiers 105 to 107
While the gains of 7 are fixed, the color tone is adjusted by processing digital signals. That is, in this example, when the reference data is created, the amplifiers 305 to 307 are stored in the memories 111, 112 and 113.
Is stored. The control unit 314 fetches the image signals both when the shading correction reference film is loaded and when the shading correction reference film is not loaded through these memories 111 to 113, and calculates the shading correction reference data and the reference data for the light amount. These data obtained as a result are stored in the memory 116. When the negative film is actually copied, the control unit 114 compares the image signal with reference data for the light amount in the absence of the negative film, and stores the image signal in the memory.
From the data 111 to 113, the data is compared with the reference data for the light quantity, the reference data for shading correction is corrected in accordance with the comparison result, and the corrected reference data for shading correction is supplied via the memories 111 to 113. The data is supplied to the shading correction calculation devices 116 to 118 to perform calculation of shading correction on the digital image signal obtained when the negative film is actually loaded. As described above, according to the present invention, it is possible to create color correction data according to an arbitrary color correction condition. Moreover, it is not necessary to generate color correction data every time color correction is performed, and color correction can be performed using stored color correction data. Further, since the created color correction data is stored in association with the comment, necessary color correction data can be easily selected from a plurality of stored color correction data.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an example of a configuration of a projection image correction device according to the present invention. FIG. 2 is a configuration diagram schematically illustrating an example of an image reading apparatus according to the present invention. FIG. 3 is a block diagram showing a configuration of another embodiment of the present invention. [Description of Signs] 101 CCD image sensors 102, 103, 104 Sample hold circuits 105, 106, 107, 305, 306, 307 Amplifiers 108, 109, 110 A / D converters 111, 112, 113, 116, 123 Memory 114 Control unit 115 Operating units 117, 118, 119 D / A converters 120, 121, 122 Processing unit 125 Data input unit 126 Display unit 127 Projection mode selection switch 128 Shading button 202 Glass stand 203 Film 204 Film holder 205 Light source 206 Lens 207 Reflector 208 Fresnel lens

Claims (1)

(57) [Claims] Creating means for creating color correction data for performing color correction according to an arbitrary color correction condition; input means for inputting a comment indicating the color correction data; color correction data created by the creating means; Storage means for storing the comment input by the input means in association with each other; selecting means for selecting a desired comment from the comments stored in the storage means; and corresponding to the comment selected by the selecting means An image processing apparatus comprising: a color correction unit that performs a color correction process based on the color correction data.