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Color value based host image information hiding method

A host image and information hiding technology, which is applied in the field of host image information hiding based on color values, can solve the problems of limited dot movement position, dot overlap problem, low concealment, etc., and achieve good concealment and extraction, and various positions , high concealment effect

Inactive Publication Date: 2018-11-30
HEFEI OUSHIJIA ELECTRICAL & MECHANICAL EQUIP 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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  • Color value based host image information hiding method
  • Color value based host image information hiding method
  • Color value based host image information hiding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093]A method for hiding host image information based on color values, comprising the steps of:

[0094] Step 1. Select the host image and determine the hidden area

[0095] Select the host image that needs to hide anti-counterfeiting information. The host image needs to meet the following conditions:

[0096] (1), composed of m*n pixels, tiff format and color mode is CMYK (that is, composed of C channel, M channel, Y channel and K channel);

[0097] (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;

[0098] In this implementation, the input resolution of th...

Embodiment 2

[0145] 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;

[0146] Covert evaluation:

[0147] 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:

[0148] Table 3 Example 2 similarity evaluation results

[0149]

[0150] Wherein, the closer the value of SSIM is t...

Embodiment 3

[0157] 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;

[0158] Covert evaluation:

[0159] 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:

[0160] Table 5 Example 3 similarity evaluation results

[0161]

[0162] Wherein, the closer the value...

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Abstract

The invention discloses a color value based host image information hiding method. The color value based host image information hiding method comprises the following steps: 1, setting a host image anddetermining a hiding area; 2, performing host image halftone processing; 3, hiding anti-counterfeiting information; and 4, identifying the anti-counterfeiting information. The position of the phase modulation of the invention is more flexible, the identification method is more scientific, and the concealment of the anti-counterfeiting information is higher.

Description

technical field [0001] The invention belongs to the technical field of grating anti-counterfeiting, and in particular relates to a method for hiding host image information based on color values. 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 technology and Moiré effect. Th...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021G06T2201/0064
Inventor 孔令翠
Owner HEFEI OUSHIJIA ELECTRICAL & MECHANICAL EQUIP CO LTD
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