CN103903216A - Determination method based on raster anti-fake concealed image vector diagram line width - Google Patents
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Abstract
一种基于光栅防伪隐藏图像矢量图线条宽度的确定方法，制作一定线条宽度的矢量图；建立与矢量图尺寸相同的背景色块，分离四个通道，并分别对其进行加网，网点形状是圆形；将矢量图嵌入背景色块的某一通道中形成隐藏图层；建立矢量图线条宽度与背景色块的网点数学关系；根据上述数学关系选择线条宽度，制作相应宽度的嵌入矢量图并将其嵌入到背景色块的某一通道中形成隐藏图层，将四个通道进行合并，形成最终的含有隐藏信息的隐藏图像；在Photoshop中添加与背景色块相匹配的模拟光栅图层，使其隐藏图像中的隐藏信息显现。
A method for determining the line width of vector graphics based on grating anti-counterfeiting hidden images, making vector graphics with a certain line width; establishing a background color block with the same size as the vector graphics, separating four channels, and screening them respectively, and the shape of the dots is Circle; embed vector graphics into a channel of the background color block to form a hidden layer; establish the mathematical relationship between the line width of the vector graphics and the dots of the background color block; select the line width according to the above mathematical relationship, make an embedded vector diagram of the corresponding width and Embed it into a channel of the background color block to form a hidden layer, and merge the four channels to form the final hidden image with hidden information; add an analog raster layer that matches the background color block in Photoshop, Make it reveal hidden information in hidden images.
Description
Technical field
The invention belongs to image concealing technology field in antiforge, be specifically related to a kind of definite method based on the false proof hidden image polar plot of grating line thickness.
Background technology
Grating is false proof, and method is simple, and equipment and typography are not had to too high requirement, do not increase in the situation of production cost and can reach false proof object, thereby grating false proof be very promising a kind of method for anti-counterfeit.
Grating is false proof is based on halftone screen technology and the grating optical characteristics anti-counterfeiting technology producing that combines.Wherein the hiding of image is to realize by the skew of site, and this wherein will relate to the embedding hiding Info, when introduce be the polar plot of line type time, the width of lines is little on the concealment effect impact of image, but it can affect the effect that manifests of hidden image, especially thinner hour of line thickness, the loss of the unintelligible or information that can cause finally hides Info manifests, How to choose is hidden polar plot line thickness, there is important production meaning for the quality that improves antiforge, so definite method of the polar plot line thickness in searching hidden image is extremely necessary.
Summary of the invention
The object of this invention is to provide a kind of definite method based on the false proof hidden image polar plot of grating line thickness, manifesting of making that the false proof middle embedding polar plot of grating hides Info reaches good effect.
The technical solution adopted in the present invention is, a kind of definite method based on the false proof hidden image polar plot of grating line thickness is specifically implemented according to following steps:
Step 1, the lines of setting certain width, making will embed the polar plot of background color lump;
Step 2, sets up the background color lump measure-alike with polar plot, blue or green C, pinkish red M, yellow Y, four passages of black K is separated, and process by self-defined screening function respectively, and dot shape is circular;
Step 3, forms and hides Layers in a certain passage of the polar plot that step 1 is made embedding background color lump;
Step 4, makes the site of polar plot lines and background color lump in same interface, then mathematical relation is set up in the site of polar plot line thickness and background color lump;
Step 5, selects line thickness according to the mathematical relation in step 4, makes the embedding polar plot of respective width;
Step 6, with step 3, the polar plot that step 5 is made is embedded in a certain passage of background color lump and forms and hide Layers, and four passages are merged, and forms the final hidden image hiding Info that contains;
Step 7, in Photoshop, the middle simulation raster pattern layer matching with background color lump that adds, manifests hiding Info in its hidden image.
Feature of the present invention is also,
The polar plot that step 1 is made: be first that 0.1mm～0.5mm makees a polar plot at Coreldraw software line thickness, canvas size is 1～10cm × 1～10cm, and saves as AI form for to open in Photoshop, hides Layers to embed.
It is in Photoshop, to set up a background color lump the same with polar plot size that step 2 is set up background color lump, and resolution is 350dpi～2800dpi, is cmyk color pattern, and foreground C, M, Y, K dot area percentage 20%～60%; C, M, Y, tetra-passages of K are separated, and respectively it is carried out to screening, wherein screen frequency is 80LPI～200LPI, and dot shape is circular.
The formation hiding Layers in step 3 is by following process: the polar plot that step 1 is made is opened in Photoshop, rasterizing parameter is consistent with the correlation parameter of Background, activation graph is as constituency, be dragged in C, M, one of them passage figure layer of Y, K of background color lump and again activate constituency, then delete this figure layer, only retain the profile of polar plot, again the scaling of picture is amplified to maximum, certain skew is carried out in constituency with Move tool, so just formed hiding Layers of a certain passage.
The mathematical relation process of setting up the site of polar plot line thickness and background color lump in step 4 is: taking level as benchmark, the direction of vector line thickness and the angle of level are α, screen angle is β, and the angle γ of the direction of vector line thickness and screening direction is β-α; Taking γ as one jiao, lines are wide be in the right-angle triangle of a right-angle side, set up distance B in line thickness d and screening direction relation
d=Dcosγ=Dcos(β-α)
And in order to make it add the continuity manifesting after simulation grating, requirement
D≥2a=2×25.4/L
There is again a=25.4/L
Wherein, a is the length of side that mesh is adjusted unit, and L is screen frequency, and 25.4 are one inch equals 25.4mm;
And then there is d >=2 × 25.4/L cos γ.
In step 5, in the time selecting polar plot line thickness, consider that ensure can be continuous when the line thickness not identical with horizontal direction angle finally shows, the maximal value of getting cos γ at this 1, and then at this moment line thickness is:
d≥2×25.4/L。
The making of simulating grating in step 7 is mainly the same grayscale mode file of size, resolution newly-built and background color lump in Photoshop, the foreground dot area percentage of filling is 20%～60%, the go forward side by side screen screening of line linearity, and screen frequency is the same with the screen frequency of background color lump, activate black netting twine constituency, be dragged in hidden image file with Move tool, form new figure layer, will hide Info and manifest.
The invention has the beneficial effects as follows, the present invention is based on definite method of the false proof hidden image polar plot of grating line thickness, by determining the mathematical relation of polar plot line thickness and background color lump site by hiding with the principle manifesting of the false proof middle hidden image of grating, and finally carry out to determine polar plot line thickness in conjunction with the correlation parameter of site; The present invention determines the easily calculating directly perceived of the mathematic(al) representation of polar plot line thickness, can determine fast corresponding result according to different situations, thereby manifesting of making that the false proof middle embedding polar plot of grating hides Info can reach good effect, improves the false proof quality of grating.
Brief description of the drawings
Fig. 1 is the mathematics geometric analysis figure of the site of polar plot line thickness and background color lump;
Fig. 2 is that the scaling that the hidden image of embodiment 1 polar plot embedding manifests is 10% design sketch;
Fig. 3 is that the scaling that the hidden image of embodiment 1 polar plot embedding manifests is 150% design sketch.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention is based on definite method of the polar plot line thickness of the false proof hidden image embedding of grating, specifically implement according to following steps:
(1) make polar plot.First be that 0.1mm～0.5mm makees a polar plot at Coreldraw software line thickness, canvas size is (1-10) cm × (1-10) cm, and saves as AI form for to open in Photoshop, hides Layers to embed.
(2) in Photoshop, set up a background color lump.Its size is the same with polar plot size, and resolution is 350dpi～2800dpi, is cmyk color pattern, and foreground C, M, Y, K dot area percentage 20%～60%.It is carried out to the separation of C, M, Y, tetra-passages of K, and each passage is carried out to screening, wherein screen frequency is 80LPI～200LPI, and dot shape is circular.
(3) make and hide Layers.The polar plot that (1) is made is opened in Photoshop, and rasterizing parameter is consistent with the correlation parameter of Background, and activation graph is as constituency, and drag it on the some passage figure layers in background color lump with Move tool, activate constituency, and delete this figure layer, retain the profile of polar plot.Again the scaling of Photoshop is amplified to maximum, certain skew is carried out in constituency with Move tool, so just formed hiding Layers of a certain passage.
(4) according to the manufacturing process hiding Layers, set up the mathematics geometric figure of the relation of the site of polar plot lines and background color lump, as shown in Figure 1, taking level as benchmark, the direction of vector line thickness and the angle of level are α, screen angle is β, and the angle γ of the direction of vector line thickness and screening direction is β-α; Taking γ as one jiao, lines are wide be in the right-angle triangle of a right-angle side, set up distance B in line thickness d and screening direction relation
d=Dcosγ=Dcos(β-α)
And in order to make it add the continuity manifesting after simulation grating, requirement
D≥2a=2×25.4/L
There is again a=25.4/L (mm)
Wherein, a is the length of side that mesh is adjusted unit, and L is screen frequency, and 25.4 are one inch equals 25.4mm;
And then there is d >=2 × 25.4/L cos γ.
(5) select line thickness according to the mathematical relation in step 4, make the embedding polar plot of respective width;
While selecting polar plot line thickness, consider that ensure can be continuous when the line thickness not identical with horizontal direction angle finally shows, the maximal value of getting cos γ at this 1, and then at this moment line thickness is:
d≥2×25.4/L。
(6), with (3), a certain passage that the polar plot that (5) are made is embedded in background color lump forms stealthy figure layer, and four passages are merged, and forms the final hidden image hiding Info that contains.
(7) on the hidden image forming, adding simulation raster pattern layer manifests.The same grayscale mode file of size, resolution newly-built and background color lump in Photoshop, the foreground dot area percentage of filling is 20%～60%, the screen screening of the line linearity of going forward side by side, and screen frequency is the same with the screen frequency of background color lump.Activate black netting twine constituency, be dragged in hidden image file with Move tool, form new figure layer, will hide Info and manifest.
The present invention is based on definite method of the false proof hidden image polar plot of grating line thickness, by determining the mathematical relation of polar plot line thickness and background color lump site by hiding with the principle manifesting of the false proof middle hidden image of grating, and finally carry out to determine polar plot line thickness in conjunction with the correlation parameter of site; The present invention determines the easily calculating directly perceived of the mathematic(al) representation of polar plot line thickness, can determine fast corresponding result according to different situations, thereby manifesting of making that the false proof middle embedding polar plot of grating hides Info can reach good effect, improves the false proof quality of grating.
Embodiment 1
Now taking Information hiding ?in version and dot area percentage be 25% as example, bright making of the present invention and operating process specifically.
(1) in Coreldraw software with one of the several line thickness of system default in 0.353mm(Coreldraw software) line thickness makees polar plot, size is 5cm × 5cm, saves as AI form.
(2) in Photoshop, set up a background color lump.Wherein this color lump is the size of 5cm × 5cm, resolution 2800dpi.Filling foreground C, M, Y, K dot area percentage are respectively 25%.Separate four chrominance channels, carry out " image/pattern/bitmap " and process, parameter is set to output resolution ratio 2800dpi, method is used partly adjusts screen, frequency (screen frequency) is 175LPI, is shaped as circle, and C, M, Y, tetra-passage screen angles of K are respectively 15 °, 75 °, 90 °, 45 °.After setting up, carry out " image/pattern/gray scale " again and process, conversion proportion is 1.
(3) polar plot of (1) being made is opened in Photoshop, is of a size of 5cm～5cm, resolution 2800dpi in rasterizing parameter., and drag it on the black print figure layer in background color lump with Move tool as constituency with magic wand menu activation graph, activate constituency, and delete this figure layer, retain the profile of polar plot.Again the scaling of Photoshop is amplified to maximum (3200%), is selecting on keyboard, to make for 11 times the site in profile be offset by " ↑ " under the state of Move tool, so just form ? hiding Layers in version.
(4) according to the computing formula of polar plot line thickness:
d≥2×25.4/L?cos(β-α)
But consider that ensure can be continuous when the line thickness not identical with horizontal direction angle finally shows, cos (β-α) gets maximal value 1, and the formula of the computing formula of polar plot line thickness is:
d≥2×25.4/L
Wherein L is 175LPI, calculates d >=0.29mm
(5), according to result of calculation, select the polar plot line thickness of 0.3mm.Ready-made polar plot before opening in Coreldraw now, carries out " edit/search and replace/replaces object ", selects " replacement profile pen attribute ", and the profile width in searching is 0.353mm, replaces with 0.3mm.Save as AI form.
(6) black print polar plot doing with 0.3mm lines being embedded in background color lump forms stealthy figure layer, and then merge cmyk channels, forms the final hidden image hiding Info that contains.
(7) the grayscale mode file that the newly-built 5cm of being of a size of × 5cm, resolution are 2800dpi in Photoshop, foreground C, the M, the Y that fill are 0, K is 55%, and carry out " image/pattern/bitmap " and process, parameter is set to output resolution ratio 2800dpi, and method is used and partly adjusts screen, and frequency (screen frequency) is 175LPI, be shaped as straight line, angle is 45 °.Parameter sets up rear execution " image/pattern/gray scale " and processes, and conversion proportion is 1.Activate black netting twine constituency, be dragged in hidden image file with Move tool, form new figure layer, will hide Info and manifest.Its display effect as shown in Figures 2 and 3.
Fig. 2 is to be 0.3mm embedding line thickness, the resolution of background color lump is that 2800dpi and screen frequency thereof are 175LPI, the gray scale of simulation grating manifests design sketch for hiding Info of presenting after superposeing of three under 55% condition, and its scaling is 10%, can represent like this its overall effect; The scaling of Fig. 3 is 150%, so can observe its trickleer feature.
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