Contourlet transform based digital image watermarking method resisting geometrical attack

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 ...

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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