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Anti-RSC (rotating, scaling and cutting) attack robust watermark synchronization method based on parameter estimation

A robust watermarking and parameter estimation technology, applied in computing, image data processing, image data processing and other directions, can solve problems such as easy loss of feature points and limited watermark capacity.

Inactive Publication Date: 2011-05-11
SHANGHAI UNIV OF ENG SCI
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Problems solved by technology

This method uses the Harris operator to detect image feature points, which are easy to lose. In addition, although this method can resist RSC attack, because the watermark content embedded in each triangle is the same, the capacity of the embedded watermark is limited, so it can only embed unlimited pseudorandom sequence

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  • Anti-RSC (rotating, scaling and cutting) attack robust watermark synchronization method based on parameter estimation
  • Anti-RSC (rotating, scaling and cutting) attack robust watermark synchronization method based on parameter estimation

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with accompanying drawing.

[0022] like figure 1 As shown, the robust watermark synchronization method against RSC attack based on parameter estimation includes the following steps:

[0023] 1) Read in the original image, use the Harris affine invariant feature point detector to extract the original image feature points that are robust to attacks such as rotation and scaling, form a Delaunay triangle, record and save the original image feature points and Di Structural information of the Rodney-Delaunay triangle;

[0024] 2) After receiving the watermarked image at the receiving end, use the Harris affine invariant feature point detector to extract the feature points of the watermarked image to form a Delaunay triangle, record and save these feature points and triangle structure information;

[0025] 3) Normalize the Delaunay triangle of the original image and the Delaunay triangle of the watermarked...

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Abstract

The invention relates to an anti-RSC (rotating, scaling and cutting) attack robust watermark synchronization method based on parameter estimation. The method comprises the following steps: extracting affine invariant characteristic points by using a Harris affine invariant characteristic point detector; forming a Delaunay triangle by utilizing the characteristic points; matching the triangles in the image before and after the affine transformation by utilizing image normalization; computing the affine transformation parameters experienced by the image by utilizing the matched triangles; carrying out inverse transformation on the image containing watermark; and detecting the watermark after realizing synchronization. Compared with the prior art, the method provided by the invention can be free from the influence of the watermark embedding domain and the embedding method; a watermark synchronization mechanism is added to the receiving end, and the affine transformation parameters experienced by the image containing watermark are estimated by utilizing triangle normalization; and the detection is carried out after inverse transformation is carried out on the image containing watermark, thereby greatly enhancing the robustness during the processes of carrying out geometrical attacks such as rotating, scaling, cutting and the like.

Description

technical field [0001] The invention relates to watermark detection, in particular to a parameter estimation-based robust watermark synchronization method against RSC attack. Background technique [0002] As a means of copyright protection, digital watermarking is bound to suffer from various attacks. Therefore, robustness is a basic requirement of digital watermarking. Most of the existing watermarking methods can resist general signal processing such as lossy compression, adding noise, filtering and other operations, but these methods cannot resist tiny geometric attacks. The research on digital watermarking against geometric attacks has become the most challenging and difficult hot research topic in the world. [0003] The current watermarking methods against geometric attacks mainly include: [0004] ● methods based on invariant fields [0005] A typical method based on the invariant field is the Fourier-Mellin (Fourier-Mellin) invariant field proposed by Ruanaidh. T...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T1/00
Inventor 吴健珍
Owner SHANGHAI UNIV OF ENG SCI
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