Robust image double-watermarking method

Abstract

The invention discloses a robust image double-watermarking method, which mainly solves the problem that the prior methods of the same type are poor in robustness and fully utilizes two image characteristics, namely inherent texture and edges to form double watermarks. When the watermarks are embedded, a zero watermark is structured by utilizing the edge characteristics of an original host image; an intensive-texture region of the host image is obtained by an empirical mode decomposition method; and a direction with maximum energy on a Contourlet domain is selected to embed binary watermarks. When the watermarks are extracted, the edge characteristics of a synthetic image is first extracted to detect the zero watermark; then a watermark-embedding position is quickly positioned by utilizing specific keys; and the binary watermarks are extracted. The method has the advantages of high capability of resisting geometric attacks, good transparency and high security, and can be used for protecting the copyright security of digital multimedia products.

Description

technical field [0001] The invention belongs to the field of image information processing, relates to a digital image double watermark method, and can be used for copyright protection of digital multimedia products. Background technique [0002] Image digital watermarking plays an important role in multimedia copyright protection and information integrity authentication. It is a hotspot in the field of information security research. Watermark transparency and robustness are two key technical characteristics. On the premise of satisfying the requirement of transparency, embedding the watermark to the maximum and improving the robustness feature become the difficulties in the research of watermarking methods. [0003] At present, image watermarking methods based on empirical mode decomposition are rare, and HVS-based watermarking methods are: [0004] [1] Autrusseau F, Le Callet P, Ninassi A.A Study of Content based Watermarking Using an Advanced HVS Model.Intelligent Informa...

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Problems solved by technology

[0004] [1] Autrusseau F, Le Callet P, Ninassi A.A Study of Content based Watermarking Using an Advanced HVS Model.Intelligent Information Hiding and Multimedia Signal Processing., 2007, 28(10): 485-488. Using HVS characteristics to perform Fourier coefficients The division of perceptual perception ability to determine the watermark embedding position, the embedding process does not combine the visual texture characteristics of the human eye

[0005] [2] Lan Hongxing, Chen Songqiao, Hu Aina, Li Taoshen, Research on the Second Generation Digital Watermarking Algorithm Based on Wavelet Domain, Acta Electronics, 2007, 9(9): 1799-1803. Embedding watermark on the low-frequency coefficient feature vector in wavelet domain , the watermark embedding strength is controlled by the texture characteristics, where the strength of the texture is determined by the number of large coefficients in the wavelet block, simple, and the accuracy needs to be improved

[0007] Analysis shows that the above method has certain limitations

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