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Study on Video Digital Watermarking Technology Based on LDPC Codes

Author: WangYaZuo
Tutor: ZhuBingLian
School: Chongqing University
Course: Signal and Information Processing
Keywords: LDPC code MPEG-4 video watermarking robustness
CLC: TP309.7
Type: Master's thesis
Year: 2010
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Abstract


Digital watermarking is an information hiding technology. By using human visual, auditory redundancy to the digital multimedia, this technology takes signal processing method to embed the information (watermarking) into the content of certain digital media, in order to achieve copyright protection, data authentication, piracy tracing, covert communications purposes and so on.As a kind of Error-correcting codes, LDPC (Low Density Parity Check) code is a block code based on sparse parity check matrices. Same as to Turbo code, LDPC good performance is close to that of the Shannon limit codes. Compared with the Turbo code, LDPC codes have a more systematic method of optimal design, more powerful error correction, capability and lower floor effect. And because LDPC iteration decoding algorithm is a parallel algorithm, LDPC iterative decoding can be implemented fully in parallel operation. Its delay is far less than that of Turbo code serial iterative decoding algorithm. Combining MPEG-4 video coding standard, this thesis made a preliminary exploration and research on the application of LDPC coeds in respect of video watermarking. Main tasks are as follows:(1) This thesis studies the theory of digital watermarking techniques, including watermarking classification features, basic model, typical algorithms, attack methods and so on. It focuses on the video watermarking and MPEG-4 encoding technology and gives a detailed exposition.(2) The thesis investigates the theory of LDPC codes, introduces LDPC codes definition, representation encoding and decoding methods and so on. Focuses on the LDPC code decoding based on several methods of Belief Propagation.(3) Through Matlab simulation, the thesis analyses the impact of LDPC code length, code rate, and decoding iterations on the decoding performance. Combined with capacity constraints of watermarking system, it proposes a blind image watermarking detection algorithm based on LDPC codes and quantization. The purpose of this method is to embed the watermark during the quantization process without additional process for watermarking itself. In the embedding process, it uses different quantizers to quantify the original signal according to different watermark information; in extracting process, watermark information is restored according to the distance between data to be detected and different quantitative results. Simulation results show that the program has good transparency and robustness.(4) Based on the image watermarking algorithm, the thesis proposes a blind watermarking detection algorithm combined with LDPC codes and MPEG-4 video coding standard. Experimental results show that the program can improve the watermarking against attack during the transmission and have good robustness and visual hidden features. This is a preliminary attempt of LDPC codes in the field of video watermarking.

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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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