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Color image digital watermark method capable of resisting stamping, printing and scanning processes

A color image and digital watermarking technology, applied in the fields of authentication, information security and anti-counterfeiting, can solve the problems such as the watermark detection time cannot be too long, the watermark algorithm running time is short, etc., to achieve the effect of convenient technical detection and fast technical upgrade

Inactive Publication Date: 2015-01-28
JILIN UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (3) The detection time of the watermark should not be too long, and the authenticity identification of printed or printed documents usually needs to be carried out in real time on site, so the watermark algorithm should run for a short time

Method used

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  • Color image digital watermark method capable of resisting stamping, printing and scanning processes
  • Color image digital watermark method capable of resisting stamping, printing and scanning processes
  • Color image digital watermark method capable of resisting stamping, printing and scanning processes

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Embodiment Construction

[0041] 1. Convert the RGB color space of the color image stored in the computer to L * a * b * The color space is represented by a quaternary hypercomplex number matrix. The three components of the color image are respectively stored in the imaginary part of the hypercomplex number, and then the Fourier transform of the supercomplex number is performed on the whole, expressed by the matrix c(u, v), and the The origin of the matrix c(u,v) is moved to the center of the matrix, and the matrix is ​​processed in uniform logarithmic polar coordinates, and the discrete logarithmic polar coordinates (k 1 ,k 2 ), (01 ≤M,2 ≤N);

[0042] 2. Construct a two-dimensional watermark signal Qw(m,n) (0<m≤M,<n≤N) in the form of a quaternary hypercomplex number. First, encode the readable watermark (certificate number, text logo, icon, etc.) into binary Watermark signal, convert the unipolar binary sequence of the watermark signal after error correction coding and random interleaving into a b...

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Abstract

The invention relates to a color image digital watermark method capable of resisting stamping, printing and scanning processes and belongs to the technical fields of anti-counterfeit, authentication and information safety. The invention adopts the technical scheme that an L*a*b* color space of a color carrier image is represented by quaternary supercomplex number; readable watermark information is encoded and modulated to generate a two-dimensional watermark signal in a form of the quaternary supercomplex number; and the watermark embedding position is determined by a uniform discrete logarithmic polar coordinates method. The color image digital watermark method capable of resisting stamping, printing and scanning processes has the beneficial effects that the embedding capacity of watermarks is large; the robustness resisting synchronous distortion is strong; the gap of an image quality evaluation function of the color image is filled; self-adaption embedding of the watermarks with highest strength is realized; the robustness resisting rotation, compression, stamping, printing and scanning attacks is strong; and the method can be widely applied to anti-counterfeiting domain authentication of various certificates and printed products.

Description

technical field [0001] The invention relates to the technical field of anti-counterfeiting, authentication and information security, and is a color image digital watermarking technology that can embed large-capacity watermark information in color images and is resistant to printing, printing and scanning attacks and can be used for certificates and printed matter anti-counterfeiting and authentication . Background technique [0002] By consulting relevant materials and related patents, the following patents are mainly cited: [0003] [0004] The application of digital watermarking technology in the anti-counterfeiting and authentication of printed (printed) images has advantages that other technologies cannot replace, such as technology exclusivity, transparency, fast technology upgrading, convenient technology testing, and hierarchical and decentralized management. In this application, printing (printing) is a necessary process from digital content to physical objects ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 年桂君周军王丹唐笑年
Owner JILIN UNIV
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