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Improved hiding method of moire grating anti-counterfeiting information

A moiré and grating technology is applied in the hidden field of moiré grating anti-counterfeiting information, which can solve the problems of low concealment, suboptimal extraction performance, and overlapping of dots, etc., so as to reduce the difficulty of operation and improve the concealment of coding. Sex and the effect of extracting identification

Inactive Publication Date: 2018-11-23
合肥博之泰电子科技有限公司
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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 displacement adjustment method will cause dot overlapping problems, causing visual perception and low concealment;
[0008] (2) In the anti-counterfeiting information extraction stage, the digital grating used did not achieve the best extraction performance;
[0009] (3), the workload is heavy and the operation is cumbersome

Method used

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  • Improved hiding method of moire grating anti-counterfeiting information

Examples

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Embodiment 1

[0099] An improved method for hiding anti-counterfeiting information of moiré gratings, comprising the following steps:

[0100] (1), prepare the manuscript and pre-processing

[0101] see figure 1 , prepare the original, the original is a rectangular structure and a digital file synthesized by the color channel, the color channel is composed of four channels: C channel, M channel, Y channel and K channel, read the dot percentage on each channel in the image processing software value, at least one channel in the color channel has the same area of ​​dot percentage, and the value of the dot percentage in the described area is α, and α is 0.1~0.5; read in the photoshop software in the present embodiment and obtain α= 0.15; and the channel with the same dot percentage is the C channel;

[0102] Select channel C as the encryption channel, and the remaining channels are 3 common channels, and set the screening parameters for the 4 channels for screening processing, see figure 2 ...

Embodiment 2

[0142] On the basis of embodiment 1, the difference between embodiment 2 and embodiment 1 is: (1), select different manuscripts, the α value of reading is 0.3; (2), anti-counterfeit information is figure, and described dot displacement adopts The photoshop software is completed, and the method for establishing the dot selection area is as follows:

[0143] (1), create a new image two in photoshop, the length and width of image two are the same as the length and width of the original, the resolution of image two is the same as the output resolution, the background content is white, and the "layer" is obtained in the layer channel 0", copy the encrypted channel halftone image into image 2 to get "Layer 1", copy "Layer 1" to get "Layer 2"; copy "Layer 2", "Layer 1" and "Layer 0" is arranged sequentially in the layer window;

[0144] (2) Put in the anti-counterfeiting information to get "Layer 3", select "Layer 3", use the magic wand tool to select the anti-counterfeiting informa...

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Abstract

The invention discloses an improved hiding method of moire grating anti-counterfeiting information. The method comprises the following steps: (1) manuscript preparation pre-processing; (2) lattice point displacement; (3) improvement of lattice point percentage; (4) image synthesis; and (5) anti-counterfeiting information extraction. Microscopic processing is performed on the lattice points of a manuscript screening image, thus breaking through the technical bias, improving the encoding concealment and extraction identifiability, and reducing the operation difficulty.

Description

technical field [0001] The invention belongs to the technical field of grating anti-counterfeiting, and in particular relates to an improved method for hiding anti-counterfeiting information of moiré gratings. 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 M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32
CPCH04N1/32256
Inventor 王飞
Owner 合肥博之泰电子科技有限公司
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