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Research of Static Image Watermarking Algorithm Based on Wavelet Domain

Author: YangFaKe
Tutor: ZhengQiuMei
School: China University of Petroleum
Course: Applied Computer Technology
Keywords: Digital Watermarking Robustness Wavelet Transform Chaos Block energy Relationship
CLC: TP309.7
Type: Master's thesis
Year: 2008
Downloads: 72
Quote: 3
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With the network technology , the rapid development and wide application of multimedia technology , digital multimedia information can be convenient communication and transaction , which also brought the issue of digital copyright . The digital watermarking technology is the new method , the rise in recent years in the field of information security , copyright protection is an open network environment for copyright protection , authentication source and integrity of the new technology . Wavelet analysis with multi- resolution analysis and multi-scale analysis features , has been widely used in image processing . Wavelet analysis of the contradictions between the watermarking algorithm can better balance the watermark robustness and invisibility . Currently , based on the wavelet domain watermarking algorithm has become a hot topic . This paper first introduces the basic concepts of the development status of the digital watermarking and digital watermarking ; introduction of wavelet theory , introduced the multi-resolution analysis and Mallat algorithm principle of image wavelet decomposition and reconstruction . Secondly, the proposed two improved algorithm based on the wavelet domain watermark . (1 ) digital watermarking based wavelet coefficient block energy analysis improved algorithm : wavelet coefficients wavelet domain block , and further statistical analysis of the sub- block energy selected the maximum energy blocks as watermark information embedding area ; Logistic map pretreatment and after treatment normalized to 0,1 watermark sequences, as the watermark information is directly embedded in the carrier image of the watermark . Balance the conflict between robustness and invisibility algorithm to some extent , has better robustness , strong anti decipher . ( 2 ) based on the relationship of image watermarking Improved Algorithm : The algorithm is based on the second generation wavelet lifting scheme ; Arnold transform pretreatment of the watermark information , based on the size of the relationship of the wavelet coefficients adaptive wavelet decomposition of the embedded watermark carrier image . The algorithm is simple , fast operation , blind watermarking algorithm . The experimental results show that the algorithm has good robustness and invisibility . Conclude this work , pointed out the direction of future research , and the development of the digital watermarking prospected .

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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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