Hiding and extracting method for anti-counterfeiting information with 0-degree mother set screening angle

A technology of screening angle and extraction method, which is applied in the field of hiding and extracting anti-counterfeiting information, can solve the problems of low concealment, overlap of dots, limited moving position of dots, etc., and achieve high concealment, diverse positions, and good concealment and extractive effects

Inactive Publication Date: 2018-10-30
HEFEI DAHU ELECTRIC WIRE & CABLE TECH CO LTD
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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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  • Hiding and extracting method for anti-counterfeiting information with 0-degree mother set screening angle
  • Hiding and extracting method for anti-counterfeiting information with 0-degree mother set screening angle
  • Hiding and extracting method for anti-counterfeiting information with 0-degree mother set screening angle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] A method for hiding and extracting anti-counterfeiting information with a master screen angle of 0 degrees, comprising the following steps:

[0087] Step 1. Select the host image and determine the hidden area

[0088] Select the host image that needs to hide anti-counterfeiting information. The host image needs to meet the following conditions:

[0089] (1), composed of m*n pixels, the color mode is CMYK (that is, composed of C channel, M channel, Y channel and K channel);

[0090] (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;

[0091] In this impl...

Embodiment 2

[0138] 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;

[0139] Covert evaluation:

[0140] 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:

[0141] Table 3 Example 2 similarity evaluation results

[0142]

[0143] Wherein, the closer the value of SSIM is t...

Embodiment 3

[0150] 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;

[0151] Covert evaluation:

[0152] Carry the master halftone image of anti-counterfeit information in embodiment 3 and carry out image synthesis with 3 sub-version halftone images, obtain the host image halftone image that carries 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 5 below Show:

[0153] Table 5 Example 3 similarity evaluation results

[0154]

[0155]

[0156] Wherein, the closer the va...

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Abstract

The invention discloses a hiding and extracting method for anti-counterfeiting information with a 0-degree mother set screening angle. The method comprises the following steps that: S1: setting a hostimage, and determining a hiding area; S2: carrying out halftone processing on the host image; S3: hiding the anti-counterfeiting information; and S4: identifying the anti-counterfeiting information.By use of the method, a phase modulation position is more diversified and flexible, the identification method is more scientific, and the stealthiness of the counterfeiting prevention information is higher.

Description

technical field [0001] The invention belongs to the field of grating anti-counterfeiting technology, and in particular relates to a method for hiding and extracting anti-counterfeiting information whose master screen screen angle is 0 degrees. 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 h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00G06T9/00
CPCG06T1/00G06T9/00
Inventor 王月斌
Owner HEFEI DAHU ELECTRIC WIRE & CABLE TECH CO LTD
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