Anti-counterfeit mark concealment method which adopts error diffusion of gray value of boundary dots
An anti-counterfeiting mark and error diffusion technology, applied in the field of anti-counterfeiting mark hiding, can solve problems such as inability to apply host images, contour distortion, and large scale coefficients.
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Embodiment 1
[0081] A method for hiding an anti-counterfeit mark using boundary dot gray value error diffusion, comprising the following steps:
[0082] step 1),
[0083] see figure 1 , input the host image (named "sofa"), the host image includes x×y pixels, the subscript (x, y ) represents the coordinates of the pixel point, and the CMYK channel of the host image is color-separated, and the color separation is to separate the CMYK channel of the host image to obtain four 256-level grayscale images. Therefore, a total of 4 C, M, Y and K are obtained. channel; choose C channel as the host channel;
[0084] Step (2),
[0085] Adopt amplitude modulation screening technology, set the generation method of screen dots as model method, screen processing to get the halftone image of 4 channels composed of screen dots; set screen screening parameters when digital screening, screen screening parameters include screen angle, screen line Number, dot shape and output resolution, the screen angle of...
Embodiment 2
[0127] Compared with Example 1, the difference between Embodiment 2 and Embodiment 1 is that different host images (named "cake") and anti-counterfeiting marks are used, and the host channel is M channel; The method refers to compressing the number of dot models in the model method according to the ratio to obtain another basic model. When the gray value decreases or increases by one level, one more or one less recording point is exposed in the corresponding basic model, thus expressing out all tones in the host image, combined with Figure 5-8 It can be seen that the anti-counterfeiting mark of Example 2 is completely invisible in the synthesized host image to be output, has very good imperceptibility, and can be very clearly extracted by the test grating during recognition.
Embodiment 3
[0129] Compared with Embodiment 1, Embodiment 3 differs in that it adopts different host images (named "scenery") and anti-counterfeiting marks. combine Figures 9 to 12 It can be seen that the anti-counterfeiting mark of Example 3 is also completely invisible in the synthesized host image to be output, has very good imperceptibility, and can be very clearly extracted by the test grating during recognition.
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