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A recognizable anti-counterfeit information hiding method based on phase modulation method

A phase modulation, identification and anti-counterfeiting technology, which is applied in image data processing, instruments, calculations, etc., can solve the problems of limited mobile position, low concealment, overlapping problems of network points, etc., and achieve various positions, high concealment, and identification method scientific effect

Inactive Publication Date: 2018-12-14
合肥博创机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) In the anti-counterfeiting information hiding stage, when the dot percentage exceeds 20%, the use of the phase modulation method will cause dot overlapping problems, causing visual perception, and the concealment is low;
[0008] (2) The location of outlets is limited

Method used

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  • A recognizable anti-counterfeit information hiding method based on phase modulation method
  • A recognizable anti-counterfeit information hiding method based on phase modulation method
  • A recognizable anti-counterfeit information hiding method based on phase modulation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] An identifiable anti-counterfeiting information hiding method based on a phase modulation method, comprising the following steps:

[0085] Step 1. Select the host image and determine the hidden area

[0086] Select the host image that needs to hide anti-counterfeiting information. The host image needs to meet the following conditions:

[0087] (1), composed of m*n pixels, the color mode is CMYK (that is, composed of C channel, M channel, Y channel and K channel);

[0088] (2) At least one channel of the host image has a hidden area where anti-counterfeiting information can be set, the hidden area has s*s pixels, s is smaller than m and n, the channel where the hidden area is located is the master, and the remaining channels are 3 sub-plates, determine the position of the hidden area on the master plate, remember that all pixels in the hidden area have the same color value on the master plate, denoted as α, and the range of α is 0.1-0.5;

[0089] In this implementation...

Embodiment 2

[0136] see Figure 8-11 , on the basis of embodiment 1, the differences of embodiment 2 are: (1), the host image is different; (2), the anti-counterfeiting information is text; (3), α is 0.1;

[0137] Covert evaluation:

[0138] Carrying the master plate halftone figure of anti-counterfeit information in embodiment 2 and 3 secondary plate halftone figures carry out image synthesis, obtain the host image halftone figure carrying anti-counterfeit information; Adopt SSIM (structural similarity) algorithm and WSNR (weighted Signal-to-noise ratio) to evaluate the similarity between the halftone image of the host image without anti-counterfeiting information and the halftone image of the host image carrying anti-counterfeiting information, so as to indirectly obtain the evaluation results of the concealment of hidden information, as shown in Table 3 below Show:

[0139] Table 3 Example 2 similarity evaluation results

[0140]

[0141] Wherein, the closer the value of SSIM is t...

Embodiment 3

[0148] see Figures 12 to 15 , on the basis of embodiment 1, the differences of embodiment 3 are: (1), the host image is different; (2), the anti-counterfeiting information is a graphic; (3), α is 0.25;

[0149] Covert evaluation:

[0150] Carrying the master plate halftone figure of anti-counterfeiting information in embodiment 3 and 3 sub-version halftone figures carry out image synthesis, obtain the host image halftone figure carrying anti-counterfeiting information; Adopt SSIM (structural similarity) algorithm and WSNR (weighted Signal-to-noise ratio) to evaluate the similarity between the halftone image of the host image without anti-counterfeiting information and the halftone image of the host image carrying anti-counterfeiting information, so as to indirectly obtain the evaluation results of the concealment of hidden information, as shown in Table 5 below Show:

[0151] Table 5 Example 3 similarity evaluation results

[0152]

[0153] Wherein, the closer the value...

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Abstract

The invention discloses a recognizable anti-counterfeit information hiding method based on a phase modulation method, comprising the following steps: 1, setting a host image and determining a hiding area; 2, performing halftone processing of the host image; 3, hiding anti-counterfeit information; 4: identifying the anti-counterfeit information. The phase modulation position of the invention is more diverse and flexible, the identification method is more scientific, and the concealment of the anti-counterfeit information is higher.

Description

technical field [0001] The invention belongs to the technical field of grating anti-counterfeiting, and in particular relates to an identifiable anti-counterfeiting information hiding method based on a phase modulation method. Background technique [0002] The limit resolution ability of normal human vision is limited. When the size and pitch of dots in the digitally screened image are smaller than the limit resolution ability of human vision, the human eye cannot distinguish the dots. Therefore, in fact, the discretized binary image is discontinuous, but due to the visual characteristics of the human eye, if you look at it at a certain viewing distance, you cannot distinguish the dots at all, that is, you cannot distinguish the image details, and finally give people a continuous tone. image effects for print reproduction of continuous tone originals. [0003] Grating anti-counterfeiting is the anti-counterfeiting technology produced by the combination of halftone screening...

Claims

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Application Information

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IPC IPC(8): G06T9/20
CPCG06T9/20
Inventor 何飞
Owner 合肥博创机械制造有限公司
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