Method for hiding and extracting anti-counterfeiting information based on dot displacement

An extraction method and network technology, applied in the field of concealment and extraction of anti-counterfeiting information, can solve the problems of low concealment, suboptimal extraction performance, cumbersome operation, etc., so as to reduce the difficulty of operation, improve the concealment of coding and the recognition of extraction. Effect

Inactive Publication Date: 2018-11-27
合肥佳洋电子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for hiding and extracting anti-counterfeiting information based on dot displacement
  • Method for hiding and extracting anti-counterfeiting information based on dot displacement
  • Method for hiding and extracting anti-counterfeiting information based on dot displacement

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Embodiment 1

[0099] A method for hiding and extracting anti-counterfeiting information based on dot displacement, 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= 0.2; and the channel with the same dot percentage is the C channel;

[0102] Select the C channel as the encryption channel, and the remaining channels are 3 common channels, set the screening parameters for the 4 channels respectively for screening pr...

Embodiment 2

[0146] On the basis of embodiment 1, the difference between embodiment 2 and embodiment 1 is: (1), select different manuscripts for use, and the alpha value of reading is 0.3; (2), anti-counterfeiting 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:

[0147] (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;

[0148] (2) Put in the anti-counterfeiting information to get "Layer 3", select "Layer 3", use the magic wand tool to select the anti-cou...

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Abstract

The invention discloses a method for hiding and extracting anti-counterfeiting information based on dot displacement. The method comprises the following steps: (1), preparing an original document andpreprocessing the original document; (2) performing dot displacement; (3) improving the dot percentage; (4), performing the image synthesis; and (5) extracting the anti-counterfeiting information. Thedots of the original screen image are subjected to microscopic processing, the technical prejudice is broken, the coding invisibility and the extraction identification are improved, and the operationdifficulty is lowered.

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 based on dot displacement. 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 te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N1/32
CPCH04N1/32256H04N1/32272
Inventor 朱明超
Owner 合肥佳洋电子科技有限公司
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