| With the development of compression technology and network technology, people can easily and quickly copy and transmit a variety of digital video, and its copyright protection has become an urgent need to address the issue of digital video watermarking technology that provides an effective means to resolve. In this paper, the digital video watermarking has been studied mainly in the following areas have achieved some results:A blind adaptive video watermarking algorithm based on DCT(disc-rete cosine transformation) and SVD (singular value decomposition) is proposed. The algorithm first partitions the video stream into several shots, And both the frames of the shots are transformed into DCT-SVD domain. the watermarking sequence is embedded into the largest singular value. Experiments showed the new algorithm meet the transparency requirements at the same time meet the requirements of a certain robustness, resistance to low-pass filtering, median filter, noise and H.264 compression, and Collusion, Cut-and-splice attacks.The paper also propose a algorithm to watermark in video while it is being compressed in accordance with the H.264 standard.First,we choose appropriate macroblocks to be watermarked and proper multiple used for spread spectrum in accordance with various macroblock texture features as well as the length of the watermark sequence.The algorithm embed the spread spectrum watermark sequence into the choosed macroblocks. In accordance with 4×4 DCT transform human vision model proposed specific for H.264 compression,we select a suitable coefficient of each macroblock and make appropriate adjustment to embed watermark. Watermark is extracted by identifying the symbol of the coefficients of the selected locations. Experimental results show that the algorithm takes care of robustness and transparency requirements. The robust watermark embedded has good immunity to some attacks such as the recompression, Gaussian noise, salt and pepper noise, Gaussian filtering an so on. |
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