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20-50% website percentage-based website displacement grating anti-fake method

A technology of dot percentage and dots, applied in image data processing, instruments, image data processing, etc., can solve the problems of suboptimal extraction performance, dot overlap problem, complicated operation, etc., to improve concealment and extraction recognition. , reduce workload, reduce the effect of workload

Inactive Publication Date: 2018-11-16
HEFEI DONGHENGRUI ELECTRONICS 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%, especially the dot percentage of 20-50%, using 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 in the production did not achieve the best extraction performance;
[0009] (3), the workload is heavy and the operation is cumbersome

Method used

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  • 20-50% website percentage-based website displacement grating anti-fake method
  • 20-50% website percentage-based website displacement grating anti-fake method
  • 20-50% website percentage-based website displacement grating anti-fake method

Examples

Experimental program
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Embodiment 1

[0080] An anti-counterfeiting method for a dot displacement grating based on a dot percentage of 20% to 50%, comprising the following steps:

[0081] (1), prepare the manuscript and pre-processing

[0082] see figure 1 , prepare the manuscript, the manuscript has a rectangular structure and is a digital file synthesized by color channels. The color channel consists of 4 channels: C channel, M channel, Y channel and K channel. Read the value of the dot percentage on each channel in photoshop , at least one of the color channels has an area with the same dot percentage, and the value of the dot percentage in the region is α, and α is 0.2 to 0.5; the value read in this embodiment is 0.3, and has the same dot percentage The channel in the area is C channel;

[0083] 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 , to obtain an encrypted chan...

Embodiment 2

[0129] see Figure 8 ~ Figure 13 , on the basis of embodiment 1, the difference between embodiment 2 and embodiment 1 is: (1), the α value of reading is 0.25; Substituting displacement algorithm and dot percentage improvement algorithm; (2), anti-counterfeiting information is figure, The method for setting up the network selection area is as follows:

[0130] Create a new image 2 in photoshop, the length and width of the image 2 are the same as the length and width of the original, the resolution of the image 2 is the same as the output resolution, the background content is white, and "layer 0" is obtained in the layer channel, and the The encrypted channel halftone map is copied into Image 2 to obtain "Layer 1", and "Layer 1" is copied to obtain "Layer 2"; "Layer 2", "Layer 1" and "Layer 0" are ” are arranged in the layer window in turn;

[0131] Insert the anti-counterfeiting information to get "Layer 3", select "Layer 3", use the magic wand tool to select the anti-counter...

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Abstract

The invention discloses a 20-50% website percentage-based website displacement grating anti-fake method. The method comprises the following steps of: (1) manuscript preparation and preprocessing; (2)website displacement; (3) website percentage-grade improvement; (4) image synthesis; and (5) simulation and decoding. According to the method, a displacement algorithm and a website percentage algorithm are designed for the encrypted areas with website percentage of 0.2-0.5, so that the stealthiness and extraction recognizability of anti-fake information are improved and the operation difficulty is reduced.

Description

technical field [0001] The invention belongs to the field of grating anti-counterfeiting technology, and in particular relates to an anti-counterfeiting method for a dot displacement grating based on a dot percentage of 20% to 50%. 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 scre...

Claims

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Application Information

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IPC IPC(8): G06T1/00
CPCG06T1/0021
Inventor 齐慧
Owner HEFEI DONGHENGRUI ELECTRONICS TECH CO LTD
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