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Method for local non-linear geometric attack resisting watermark based on image phase characteristic

A geometric attack and non-linear technology, which is applied in the field of digital watermarking and multimedia data protection, can solve problems such as non-linear geometric attacks, achieve good robustness, realize watermark detection, and have a wide range of applications

Inactive Publication Date: 2008-09-24
李京兵
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  • Abstract
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  • Application Information

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Problems solved by technology

So far, local nonlinear geometric attacks are still a relatively difficult problem to solve
The effective method has not been reported yet, and it is still blank

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  • Method for local non-linear geometric attack resisting watermark based on image phase characteristic
  • Method for local non-linear geometric attack resisting watermark based on image phase characteristic
  • Method for local non-linear geometric attack resisting watermark based on image phase characteristic

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Embodiment Construction

[0107] Below in conjunction with accompanying drawing, the present invention is further described, test platform adopts Matlab6.5, uses 1000 groups of independent binary pseudo-random sequences (values ​​are +1 or -1), and each group of sequence length is 128bit, in these 1000 groups of data In , we randomly extract a group (here we choose the 500th group) as the embedded watermark sequence. The original image is lena512, see Figure 3(a), the original image is expressed as F(i, j), where 1≤i≤512, 1≤j≤512 corresponds to the DFT transformation coefficient matrix FF(i,j), where 1≤i≤512, 1≤j≤512. The phase eigenvector of the image is formed by performing sign operation on the coefficients of the low-intermediate frequency part of FF(i, j). Considering the robustness and the capacity of embedding the watermark once, the length of the feature vector is taken here as L=128bit. After the watermark W' is detected, it is judged whether there is a watermark embedded by calculating the ...

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Abstract

A figure watermark technology based on image phase character belongs to multimedia signal dispose field. The first step is to embed the watermark: (1) pick up one vector standing for original image phase character, in the phase sub-space through DFT transform; (2) get one two-valued logic list through Hash function for the phase feature vector and the watermark. The extraction of watermark includes the follows- (3) get phase feature vector to the image by DFT transform; (4) pick up the watermark through Hash function and two-valued logic list. It is the figure watermark technology based on image phase character with stronger ability to resist local non-linearity geometry attack.

Description

technical field [0001] The invention relates to a digital watermark technology based on image phase characteristics, is a multimedia data protection method, and belongs to the field of multimedia signal processing. technical background [0002] At present, digital watermarking is one of the effective methods to protect digital media copyright. But now most watermarks can only resist conventional attacks, often powerless against geometric attacks. In recent years, some foreign scholars have done some theoretical research on anti-geometric attack watermarking algorithm, but the effect is not ideal. [0003] The current digital watermarking algorithms against geometric attacks mainly include: [0004] The original image is used to judge the geometric transformation experienced by the strategy of search and judgment, and then the watermark is extracted by inverse transformation of the watermark image. Since the geometric deformation experienced by the watermarked image is not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 李京兵
Owner 李京兵