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Study of Video Watermarking Algorithm Based on the Wavelet Transform

Author: YangJing
Tutor: ZhangSuWen
School: Wuhan University of Technology
Course: Power Electronics and Power Drives
Keywords: digital watermarking wavelet transform video key frame robust
CLC: TP309.7
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 0
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Abstract


With the increasing popularity of computer networks and the rapid development of multimedia technology, multimedia data gradually become the main source of access to information,However, the rapid development of current digital signal processing and computer network transmission technology has made copyright protection facing serious challenges. So as an effective means of copyright prote-ction, digital watermarking technology become a difficult problem of multimedia signal processing. It is based on some kind algorithm, embedded the information in a particular vector, which can be detected by some standards to extraction or testing.Although the digital watermarking technology has made rapid development, mainly in a static image watermark technology. It is quite few to studies on the video, with more and more the appearance of digital video products, such as VCD, DVD, digital video watermarking technology makes the market demand has become extremely urgent. This article is based on the discrete wavelet transform and the theory of digital watermarking technology, in the video sequence to embedded watermarking. First, the article describes the classification and characteristics of digital watermarking, listed three different hashing algorithm, simply analysing the watermark embedding and extraction algorithm; then setting the theory of wavelet transform and multiresolution analysis, introducing the continuous wavelet transform, discrete wavelet transform and wavelet packet analysis, basing on the multi-resolution to transform the images of Thought 1-3 wavelet. Finally, based on the previous analysis, propose a video watermarking algorithm.Analysis this video watermarking algorithm, in two parts, one is the watermark embedding, one is the watermark extraction. For the watermark embedding, we use binary images, "Wuhan" as a watermark image, first using Arnold scrambling to enhance their security; second segmenting the AVI video on a video sequence, use European-style frame difference method to choose five key frames from the video sequence, and finally scrambling wavelet transform on images and 5 key frame disc-rete; to meet the invisibility of the robustness, select 0.04 as the embedding strength, embedding the watermark to the two low-frequency transform coefficients of video, and through the wavelet inverse transform, we can get the embedded video watermarked image; take the method needing the original video image extraction algorithm, quickly and efficiently extract the watermark. Finally, using MATLAB simulation to experiments, we can see from the experimental results that the algorith-m has strong invisibility. And for various noise attacks and frame compression, shear, and so this algorithm has a good robustness.

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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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