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The Research of Digtal Watermaking Based on Image Security

Author: FanTengFei
Tutor: HuangYingWei
School: Xi'an University of Technology
Course: Of Food Science
Keywords: Image forgery Discrete Cosine Transform Discrete Wavelet Transform Robustness
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 97
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Abstract


The digital watermarking technology is cutting - edge research areas , the rise in recent years has been the rapid development of the copyright protection of multimedia information and the integrity of the certification has become a hot topic in the field of multimedia information security , digital watermarking has become a kind of new technology as a security trend. In this paper, the digital image forgery done the following work : first introduced the discrete cosine transform domain watermarking technology , put forward a better robustness discrete cosine transform domain digital watermarking algorithm . The algorithm of the watermark information Hamming error correction function watermark extraction combined with pseudo-random selection of the Logistic chaotic sequence embedded subgraph , to enhance the security of watermarking system . Experiments show that the algorithm has better robustness of conventional geometric attacks . Secondly , focuses on the discrete wavelet domain watermarking technology , an anti- print scanned color image watermarking algorithm . The algorithm first image converted from the RGB color space to a device-independent Lab color space , whichever brightness L in the Lab model component is selected according to the block size of the energy suitable embedding point adaptively embedded watermark . The experimental results show that the application of the algorithm can not only resist the conventional image processing , geometric transformations, and has good resistance on the print scan robustness . Finally , on the basis of the above algorithm , the paper gives a digital watermarking system prototype .

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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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