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Moire anti-counterfeiting method with function of simplifying embedding mode of invisible graphics and texts

An embedding method, graphic and text technology, applied in the field of moiré pattern anti-counterfeiting, can solve the problems of contribution, research, destruction, etc., and achieve the effect of simplifying the embedding method, avoiding embedding errors, and reducing the degree of cumbersomeness.

Inactive Publication Date: 2018-12-25
HEFEI SIBOT SOFTWARE DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method realizes information hiding, in actual operation, because the basis of four-color screen dot superimposition reproduction color is destroyed in the process of graphic gradation, because one of the channels is a straight line instead of screen dots, it has a negative effect on the presentation of the original image. Very strong negative effect, making it impossible to achieve a perfect reproduction of the original image tone
[0006] At present, the research results in this field mainly focus on the embedding of the anti-counterfeiting master latent image. In the research on the change of characteristic parameters, there is no research on the screen angle formed by dots. The screen angle mentioned in the current research only plays the role of forming a halftone image. There is no research on the screen angle setting to make it Contribute to anti-counterfeiting performance

Method used

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  • Moire anti-counterfeiting method with function of simplifying embedding mode of invisible graphics and texts
  • Moire anti-counterfeiting method with function of simplifying embedding mode of invisible graphics and texts
  • Moire anti-counterfeiting method with function of simplifying embedding mode of invisible graphics and texts

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] A moiré anti-counterfeiting method for simplifying the embedding method of invisible graphics and texts, comprising the following steps:

[0071] Step (1), host image preprocessing

[0072] see figure 1 , select the host image, and obtain C cyan version, M magenta version, Y yellow version, and K black version through color separation processing. Color separation processing means setting the color mode of the image to CMYK mode in the image processing software to obtain four The host image synthesized by superimposing color plates, the host image includes m*n pixels, and the corresponding color value of each pixel on the cyan version, magenta version, yellow version and black version is I C(m,n) , I M(m,n) , I Y(m,n) and I K(m,n) .

[0073] In this embodiment, the cyan version is selected as the anti-counterfeiting color version. The results of many experimental tests show that when the cyan version is used as the anti-counterfeiting color version, its effects in e...

Embodiment 2

[0098] see Figure 4 , 5 and 6, on the basis of embodiment 1, embodiment 2 uses different host images and invisible graphics, and also selects the magenta version as the anti-counterfeiting color version, and the screening angles of the cyan version, yellow version and black version are respectively 75°, 45° and 15°, the screen angle of the background area is 30°, the screen line number is set to 169lpi, and the output resolution is 2450dpi.

Embodiment 3

[0100] see Figure 7 , 8 and 9, on the basis of embodiment 1, embodiment 3 uses different host images and invisible graphics, the screening angle of the background area is 30°, and the output resolution is set to 2450dpi when screening.

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Abstract

The invention discloses a moire anti-counterfeiting method with the function of simplifying the embedding mode of invisible graphics and texts. The moire anti-counterfeiting method comprises the following steps that (1) a host image is selected and subjected to color separation treatment, thus a cyan version, a magenta version, a yellow version and a black version are obtained, and the cyan version or the magenta version is an anti-counterfeiting color version; (2) the invisible graphics and texts are selected, a corresponding anti-counterfeiting region is determined in the anti-counterfeitingcolor version according to the contour of the invisible graphics and texts, and the remaining regions of the anti-counterfeiting color version are background regions; (3) halftone treatment is conducted; (4) the invisible graphics and texts are hidden; and (5) the invisible graphics and texts are extracted. According to the moire anti-counterfeiting method, the screening angles of the anti-counterfeiting color version are set in a regional mode, thus the two kinds of screening angles on an anti-counterfeiting master version are achieved, and the anti-counterfeiting grating host image with theinvisible graphics and texts is obtained; and in the embedding aspect of the invisible graphics and texts, the anti-counterfeiting property reaches or even exceeds the anti-counterfeiting property ofa traditional phase modulation method.

Description

technical field [0001] The invention belongs to the technical field of moiré pattern anti-counterfeiting, and in particular relates to a moiré pattern anti-counterfeiting method which simplifies the embedding method of invisible graphics and texts. Background technique [0002] The theoretical basis of the moiré fringe anti-counterfeiting printing principle comes from the moiré fringe. The so-called Moiré fringes refer to the optical fringes formed by the superposition of two periodic grating patterns with similar spatial frequencies. If the mathematical expressions of these two periodic figures are known, the shape of the generated moiré figure, the interval of stripes and the characteristics of the moiré figure can be derived. Moiré fringes are two-dimensional gratings that are formed differently and have different effects. Moiré anti-counterfeiting means that after some predetermined special patterns or characters are encoded by computer Moiré, they are made in a specif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41M3/14G06T1/00
CPCB41M3/148B41M2205/40G06T1/0021
Inventor 吴青明
Owner HEFEI SIBOT SOFTWARE DEV CO LTD