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Digital Watermarking Based on Wavelet

Author: Hu
Tutor: LiaoXiaoFeng
School: Chongqing University
Course: Computer System Architecture
Keywords: Digital watermarking Template scrambling Singular value decomposition (SVD) Wavelet Transform
CLC: TP309.7
Type: Master's thesis
Year: 2009
Downloads: 116
Quote: 0
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Abstract


Information hiding and digital watermarking study was conducted in the 1990s and flourished attention , but traced , information hiding , the predecessor - steganography as early as BC was used . The rise of the 1990s and has become a hot research direction, precisely because of advances in information technology , the Internet's rapid development brought about by the application of a series of huge demand driven. Information hiding is mainly used in security and confidentiality of communications departments require the use of multimedia information redundancy in space to carry concealed information to achieve the purpose of passing secret information camouflage . Digital watermarking is also in essence a kind of information hiding, but its purpose is not to secure communication , but to indicate the carrier itself, some information, such as the creators of multimedia information , copyright information, etc. , the use of digital watermarking, multimedia products can be tracked dissemination and proliferation of illegal , to combat piracy. Digital watermarking technology is currently in a rapid and sustained development of advanced stage , the application areas is also developing rapidly . In this paper, a digital image of this most widely used digital media , the use of wavelet decomposition energy is focused on the characteristics of low-frequency coefficients part , combined Logistic chaotic sequence generator generates a set of pseudo- random numbers, as well as templates scrambling algorithm rotating diamond transform, and has good resistance to the use of geometric invariance singular value decomposition (SVD) algorithm that generates a strong security system, a digital watermark , the watermark embedding can be a good recovery, by attacks such as JPEG and show AFFINE this system has strong robustness and a certain ability to resist geometric changes , there are certain applications.

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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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