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Research on Digital Image Watermarking Algorithms Resistant to Geometric Attacks

Author: YangShengLi
Tutor: GaoZuoï¼›SunRui
School: Hefei University of Technology
Course: Signal and Information Processing
Keywords: Digital Watermarking Information Hiding Copyright Protection Geometric attacks Robustness
CLC: TP309.7
Type: Master's thesis
Year: 2011
Downloads: 91
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Abstract


With the rapid development of information technology and computer networks, storage, reproduction and dissemination of digital multimedia information becomes extremely convenient. At the same time, information security and copyright protection of digital multimedia works has become a social problem to be solved. Digital watermarking as an effective means of protecting the copyright of digital media, has become one of the hot spots of the research in the field of multimedia information security. The watermark works in the network communication process is bound to suffer from the intentional or unintentional interference or attacks. Therefore, the digital watermark for copyright protection must be hidden, security and robustness. Digital image watermarking system is facing a variety of types of attacks, including geometric attack is the most severe threat facing digital image watermarking is widely considered to be one of the bottlenecks of the digital image watermark technology onto commercial. Most able to resist geometric attacks digital image watermarking algorithm only resistant to a certain extent, the global linear geometric attacks (such as rotation, scale, zoom and pan, etc.), while the performance of random distorted attacks on the shearing attacks and recently popular powerless. Therefore, the to solve digital image watermark anti various geometric attacks (including cut and randomly distorted attacks nonlinear geometric attacks) robustness is of great practical significance. Copyright protection for digital images, still images as research subjects, in-depth analysis on the basis of the existing digital image watermarking algorithm against geometric attacks, according to the theory of digital image processing and the characteristics of digital watermarking system by studying the geometric transformation of digital images characteristics extracted with geometric invariance robust feature in the image, and the integrated use of cryptography, chaotic home chaos spread spectrum communication technology, three kinds of geometrical attacks effectively fight blind robust digital image watermarking algorithm . The focus of this paper is summarized as follows: (1) summarize and organize digital image watermarking against geometric attacks the status quo, and various digital image watermark algorithm against geometric attacks a summary of performance analysis and classification. (2) In accordance with the principle of geometric transformation of digital image gray value of the demographic characteristics of stability, the proposed color image watermarking algorithm based on the histogram to adjust the anti-geometric attacks. (3) in-depth analysis of image extended centroid the affine transformation Covarience and image singular value based on the invariance of geometric distortion (rotation, zoom, pan, transpose, mirror), based on extended centroid and DWT -SVD image watermarking algorithm against geometric attacks. (4) the use of the color image of a geometric invariant features - the mean-based 2D color histogram and cryptography, and third-party concept and zero watermark technology combine a 2D color histogram-based anti- kinds of geometric attack color image zero-watermarking algorithm.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality > Encryption and decryption
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