A method for generating and recognizing document anti-counterfeiting based on green noise features

A recognition method and noise feature technology, applied in the field of document anti-counterfeiting generation and recognition, can solve the problems of high robustness, inability to directly embed anti-counterfeiting information in text, and low visibility of original images, and achieve the effect of high stability

Active Publication Date: 2019-01-25
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the digital content embeds anti-counterfeiting information or forms an anti-counterfeiting mark at a low frequency in Fourier space, the visibility of changes to the original digital content is high, but the robustness against D/A conversion, sampling, and A/D conversion is also high; in When the high-frequency region of the Fourier space of digital content embeds anti-counterfeiting information or forms anti-counterfeiting marks, the visibility of the original image change is low, but the robustness against D/A conversion and A/D conversion is a

Method used

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  • A method for generating and recognizing document anti-counterfeiting based on green noise features
  • A method for generating and recognizing document anti-counterfeiting based on green noise features
  • A method for generating and recognizing document anti-counterfeiting based on green noise features

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Embodiment Construction

[0036] A method for generating anti-counterfeiting documents based on green noise features is provided in this embodiment, comprising the following steps:

[0037] Step (1), get the texture

[0038] Select the logo pattern to obtain the gray value g in the logo image, see figure 2 , using a band-stop filter to generate green noise textures with specific distribution characteristics, the band-stop filter is

[0039]

[0040] Among them, the value of a is 0.086, f represents the frequency of Fourier space, u and v are two coordinate values ​​of Fourier space; σ is a parameter that determines the shape characteristics of the Fourier space of green noise, f c Indicates the main frequency, which affects the robustness of anti-counterfeiting information against printing and scanning, f c The calculation method is:

[0041]

[0042] In the above formula, g is the aforementioned gray value, num _ average is a parameter; in addition, the standard deviation value of the spe...

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Abstract

The invention discloses a method for generating and identifying document anti-counterfeiting based on green noise characteristics. In the generating method, the anti-counterfeiting shading is generated in the document by utilizing the characteristics of green noise medium frequency distribution, so that the anti-counterfeiting shading does not interfere with the text information distributed in thelow frequency and high frequency regions of Fourier space, and the anti-counterfeiting information is directly embedded in the text information. In the recognition method, the anti-counterfeit pattern is scanned, extracted and analyzed so as to distinguish the authenticity of the document.

Description

technical field [0001] The invention belongs to the technical field of printing anti-counterfeiting, and in particular relates to a method for generating and identifying document anti-counterfeiting based on green noise features. Background technique [0002] The forgery of bills, contracts and other documents in our country is rampant, which brings new challenges to the information security prevention and information anti-counterfeiting of state agencies, enterprises, institutions and users. How to effectively ensure the authenticity, integrity and uniqueness of output information, and prevent illegal copying, forgery and tampering of information has become an unavoidable problem in today's society. [0003] The security and anti-counterfeiting issues of printed output information are mainly related to three aspects, namely printing paper, printing ink and printing content. Although methods such as special anti-counterfeiting paper and anti-counterfeiting ink can improve t...

Claims

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Application Information

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IPC IPC(8): G06F21/16G06T1/00G06K9/34G06K9/62
CPCG06F21/16G06T1/0021G06V10/273G06V10/267G06V10/758
Inventor 谢德红于俊彦
Owner NANJING FORESTRY UNIV
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