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

Research of Digital Video Watermarking Technology Based on MPEG-4

Author QuYunHui
Tutor TianYuMin
School Xi'an University of Electronic Science and Technology
Course Computer System Architecture
Keywords Video digital watermarking MPEG-4 stream Human visual system model
CLC TP309.7
Type Master's thesis
Year 2008
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With the increasingly widespread application of MPEG-4 video standard , must like this digital watermarking technology to protect the video copyright . However, due to some special properties of the MPEG-4 video standard , making many video watermarking method loses the role , so the study with a new video compression standard combination of watermarking algorithm has become the focus in the field of video digital watermarking . Lot of information on the basis of a comparative analysis of video watermarking method , combined with the characteristics of the MPEG-4 standard , the improvement of existing video watermarking algorithm proposed anti- frame attack and adaptive the two video watermarking algorithm : the combined motion vector and discrete cosine transform in the MPEG-4 video coding , based on their different characteristics , the low frequency coefficients in the watermark image wavelet transform embedded into the low frequency coefficients in the video sequence , I frames DCT transform , and a watermark IF after the wavelet transform coefficient embedded into the motion vectors of the B frame . 2 with MPEG-4 video compression principle as well as the characteristics of the human visual model system , and proposed an adaptive video watermarking algorithm . Based on the discrete cosine transform (DCT) of the I - frame image of the DC coefficient (DC) , and the number of low frequency coefficients , designing adaptive factor for different image blocks using different embedding strength , the watermark is embedded into the low frequency coefficients in the DCT transformed in . Comparative experiments based on MPEG-4 video watermarking system , on the basis of theoretical research . The results show that compared with the original algorithm , the algorithm proposed in robustness and imperceptibility have improved to varying degrees .

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