Dissertation
Dissertation > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > General issues > Security and confidentiality

Based on wavelet 's Digital Image Watermarking technology research

Author XuBing
Tutor ZhaoShuQing
School Beijing University of Chemical Technology
Course Applied Computer Technology
Keywords Digital watermarking Wavelet Transform Human visual system HVS
CLC TP309
Type Master's thesis
Year 2004
Downloads 225
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Digital watermarking is a digital multimedia data protection Technology]. It can be specific information - watermark embedded into audio, image, video and other all age in Digital Media. Watermark information can be representative of ownership text or ID (meaningful watermark), graphics, images, pseudo - random sequences, etc.. Transform domain digital watermarking algorithm is the future trend. In the transform domain the embedded watermark signal energy can be distributed to airspace's all pixels on, there are conducive to guarantee not to Visible Xing; HVS certain characteristics of can be easily binds to transform domain watermark coding process, there are conducive to watermark robustness performance 's improve the; transform domain method can be with the international data compression standard compatible, in order to achieve in the compressed domain's watermarking algorithm. Wavelet analysis is one kinds Time - scale analysis method, can be viewed as Fourier Transform after another milestone in the type of development, is the in recent years, rapid development of the up of the emerging disciplines, wavelet transform applied to the image processing of the basic ideological is to put image carried out multi-scale , spatial - frequency decomposition. With DCT and so other transform compared to the, DWT has many advantages, it having a multi - resolution analysis the characteristics of, better matching human visual system (HVS), having a better computing complexity degree of and so on. Wavelet transform has been a new generation of international image compression standard JPEG2000 to accept. This paper research is based on on wavelet digital watermarking technology, mainly contents are as follows. Briefly introduced the digital watermarking technology the history of, classification as well as research the status quo and progress. Gives the Digital Watermarking System the general framework of; digital watermarking the system's basic model and basic characteristics of; watermark generation, embedding and detection the general method; watermark systematic evaluation and benchmarks. And to against the digital watermarking's attack made brief introduction. Then analyzes the of wavelet the basic principles of, including the Wavelet packet and multi-wavelets, wavelet's Embedded Zero - tree structure, Wavelet Transform and the HVS matching, etc., as well as base lt; WP = 4 gt; Yu Wavelet's digital watermarking algorithm the design requirements of. As a basis for put forward two kinds wavelet domain Robust Digital watermarking algorithm, one kinds is based on the on wavelet with the on HVS two value of the image watermarking algorithm, it first take advantage of Arnold transform pairs of two value of the watermark image carry on scrambling, followed by According to HVS choose wavelet coefficients and control the embedded intensity to achieve not be something perceived case should the maximum embedding, another algorithm clever use of the BCH error correction yards to strings watermark to encode, then embedded host image, which may be used as sense watermarking algorithm to apply the .

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