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Research on Digital Watermaking Based on Transform Domain Algorithm

Author: WangJu
Tutor: FuZuo
School: Yanshan University
Course: Signal and Information Processing
Keywords: Digital Watermarking Discrete Wavelet Wavelet Transform Discrete Cosine Transform Arnold transformation Human vision system
CLC: TP309.7
Type: Master's thesis
Year: 2011
Downloads: 59
Quote: 0
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Abstract


With the rapid development of the network , more and more digital information such as : text , images , audio , video across the network quickly spread. Information on the Internet and at the same time can easily be copied and modified, so the network infringement intensified . Therefore , there is a growing emphasis on the protection of copyright in the work , so the digital watermarking technology came into being . First , the paper analyzes to study the historical background and significance of digital watermarking technology , digital watermark dynamic and the development status ; introduces the basic concepts and framework of digital watermark , basic characteristics and classification , as well as a typical digital watermarking algorithm , the final analysis introduced application of a digital watermark . Then, DCT transform principle theoretical study of the details of the definition and the basic principles of the DCT transform , DCT transform digital watermarking . Introduced pretreatment of digital watermarking technology , especially the analysis describes the Arnold transformation, and gives a different order of two-dimensional Arnold transformation cycle . IF scrambling transformation preprocessing, exchange DCT domain coefficients of the watermark to the watermark embedding . Secondly, theoretical studies on DWT principle , described in detail the definition and basic principles of the DWT transform analysis of the of DWT transform in digital watermarking applications . And gives a digital watermarking algorithm based on DWT algorithm makes use of the human visual system , the wavelet decomposition diagonal high-frequency part of the embedded watermark information . Finally, the use of the DWT and the DCT transform algorithm combining to transform the original image information , and preprocessing Arnold transform on the watermark information , and in accordance with the visual characteristics of the human eye , the full use of the characteristics of the watermark DCT and DWT transform The information is embedded into the original image .

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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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