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Method for abstracting graph and text infromation utilizing half-hue image networking hiding

A technology of hiding information and half-tone, which is applied in the direction of image communication, printing and printing of special varieties of printed matter, which can solve the problems of low-end anti-counterfeiting users who are not the best and high production cost, and achieve the effect of convenient and fast identification method

Inactive Publication Date: 2009-03-11
PEKING UNIV +2
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of analog anti-counterfeiting is that it has strong anti-counterfeiting performance and is not easy to copy and forge, but the disadvantage is that its production cost is high, and special materials and special production methods are required, so it is not the best method for low-end anti-counterfeiting users.

Method used

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  • Method for abstracting graph and text infromation utilizing half-hue image networking hiding
  • Method for abstracting graph and text infromation utilizing half-hue image networking hiding
  • Method for abstracting graph and text infromation utilizing half-hue image networking hiding

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0055] In the present embodiment, given each color plate threshold value matrix parameter is as follows:

[0056] Green version: α=90+arctan(33 / 56)=120.51 degrees, matrix width and height dimension L=208, linear dots

[0057] Product version: α=90-arctan(33 / 56)=59.49 degrees, matrix width and height size L=208, linear dots

[0058] Yellow version: α=120+arctan(33 / 56)=150.51 degrees, matrix width and height dimension L=208, linear dots

[0059] Black version: α=arctan(33 / 56)=30.51 degrees, matrix width and height dimension L=208, linear dots.

[0060] Among them, the mesh number of each color version is 187.5 lines / inch.

[0061] like figure 1 As shown, (i, j) represents the dyeing point position on the recording medium, (x, y) represents the coordinate value in the original image corresponding to it, and (u, v) represents the threshold value matrix elemen...

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Abstract

The invention relates to a method for hiding and extracting graphic and text information by hanging a halftone image on a net, belonging to an anti-counterfeiting method for halftone image processing in the field of image hard copy. Existing anti-counterfeiting technologies seldom involve the field of halftone image processing. There are mainly two anti-counterfeiting methods: digital type and analog type. The method of the present invention combines digital and analog anti-counterfeiting methods, learns from each other, and can effectively hide graphic and text information in printed manuscripts or printed manuscripts during the actual printing or printing process. At the same time, the printing film produced by the invention can easily extract the printed manuscript or the anti-counterfeit information hidden in the printed manuscript at relatively low cost. The invention ensures that all hidden information is lost after printed manuscripts or printed manuscripts undergo traditional copying and copying processes such as copying or scanning, thereby providing a convenient and quick identification method for the authenticity of anti-counterfeiting appraisal manuscripts.

Description

technical field [0001] The invention belongs to the field of halftone image processing anti-counterfeiting methods in the field of image hard copy, and in particular relates to a method for hiding and extracting graphic and text information by hanging a halftone image on a net. Background technique [0002] The development of anti-counterfeiting technology has become a considerable and fast-growing industry, and there are countless specific methods, technologies and products. The current main anti-counterfeiting technologies are: laser anti-counterfeiting technology, bio-anti-counterfeiting technology, nuclear track anti-counterfeiting technology, packaging anti-counterfeiting technology and query identification anti-counterfeiting technology and so on. There are many anti-counterfeiting technologies, but no matter what kind of anti-counterfeiting technology is used, there are two types of digital and analog. [0003] The so-called digital anti-counterfeiting technology mai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/405B41M3/00
Inventor 李海峰亓文法马世雄杨斌王立东
Owner PEKING UNIV
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