Contourlet transform based digital image watermarking method resisting geometrical attack

An anti-geometric attack, digital image technology, applied in image data processing, image data processing, instruments, etc., can solve the problem of ineffective anti-geometric attack, can not resist and other problems, achieve fast calculation speed, anti-rotation, good visual effect Effect

Inactive Publication Date: 2011-06-29
XIDIAN UNIV
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AI Technical Summary

Problems solved by technology

[0009] The above methods involving watermarking in the contourlet domain have a common defect in that the effect of resisting geometric attacks is poor, that is, they cannot resist attacks of large-angle rotation, large-scale scaling, and affine transformation.

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  • Contourlet transform based digital image watermarking method resisting geometrical attack
  • Contourlet transform based digital image watermarking method resisting geometrical attack
  • Contourlet transform based digital image watermarking method resisting geometrical attack

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Embodiment Construction

[0050] 1. Introduction to basic theory

[0051] 1. Contourlet transformation

[0052] Contourlet transform, a new extension of wavelet transform, is a multi-scale, localized, and multi-directional image representation method, which has been developed into a "true" two-dimensional signal representation capable of capturing geometric structures. The Contourlet transform employs a dual filter bank structure, which first uses a Laplacian decomposition to perform a multi-scale decomposition of the input image to capture point singularities. Each LP decomposition generates a low-frequency sub-band with half the resolution of the original image and a high-frequency sub-band with the same resolution as the original image. The high-frequency sub-band is the difference signal after sampling and filtering between the original image and the low-frequency sub-band. By continuing to use LP transform to iteratively decompose the low-frequency subbands, the original image can be decomposed i...

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Abstract

The invention discloses a contourlet-transform-based anti-geometric attack digital image watermarking method, mainly solving the problem of poor robustness of the existing similar method. The invention is technically characterized in that the method completes watermark synchronization through a geometric moment method to realize watermark embedding and extraction in a contourlet transform domain,that is, to calculate a first-order origin moment containing a watermark image I when the watermark is embedded, and reserve the first-order origin moment for the estimation of the geometric attack parameters during extraction; during watermark extraction, to estimate the geometric transformation parameters through the attacked first-order origin moment and a second-order center moment containingwatermarks, and to recover the attacked watermarks through contourlet transform. The method described by the invention has the advantages of strong anti-geometric attack ability, good watermark extracting effect and self-positioning watermark embedded location, which can be used for safety protection of digital multimedia product copyright.

Description

technical field [0001] The invention belongs to the field of image information processing, and relates to a digital image watermarking method, in particular to a geometric attack-resistant digital watermarking method based on contourlet transformation, which can be used to provide technical guarantee for the security of digital multimedia product copyright. Background technique [0002] The digital watermarking technology based on image is one of the key research points of current watermarking technology. In recent years, the research of digital watermarking technology has made great progress, especially for image data, there are various watermarking methods, which have been widely studied, but the robustness of watermarking system has always been an obstacle restricting its application. Among them, the watermark synchronization under the geometric transformation attack becomes the decisive factor of whether the watermark technology can be commercialized, and thus gradually ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T1/00
Inventor 同鸣冯玮姬红兵
Owner XIDIAN UNIV
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