Abstract: For the copyright protection of digital video, a novel video watermarking algorithm based on MPEG7 contour description was proposed. I}he original video is spitted into a series of frame groups, for each frame in the group, the points of contour shape are described by MPEG7 , and taking advantage of hash function to calculate the Keys between those points in the lI}DI}I} transform domain and the watermark signals. Then, decomposes all those contour points of each frame in one group through 2I}DI}T transform and obtains the invariant domain of the time axis and the contours,and then embeds the watermark signals into this domain to ensure the watermark reliability and robustness. And in the process of watermark extracting, it is performed multiple watermark verification to keep it accuracy. Experimental resups show that the watermarked frames are indistinguishable from the original frames subjectively and the proposed video watermarking algorithm is robust against the attacks of additive Uaussian noise,frame dropping,frame averaging and lossy compression.

Key words: Video watermarking,Logistic,DFT, MPEG-7