Research On New Algorithms Of Video Watermark Based On MPEG

Network-based information exchange supplies convenient approaches for the usage and spread of multimedia digital production.Because digital production is easy to be copied and tampered lawlessly,the information security and copyright protection of digital production has become a problem crying for solution.Therefore,the video watermarking technology has become a hot point of research,and also a difficulty.This paper generally summarized the principle of digital watermarking technology,especially video watermarking,and introduced status of video watermarking technology.After in-depth understand and researching about video watermarking technology,based on the writer' s watermarking methods of static picture,two algorithms,the video content-based video watermarking and the motion vector block-based video watermarking are put forward.In the video content-based video watermarking algorithm, the frame I is selected as embedding point.After considering that the content of video is an extremely important feature, the wavelet transformation technique,SOBEL extract technique and asymmetric encryption techniques are utilized to implement the watermark embedding.In the motion vector block-based algorithm,the characteristics of motion vector,the human visual system and the clustering features of motion vector block are considered. The FCM algorithm is used to classify the motion vectors. Watermarking information is embedded into the motion vector block units.Therefore complete decoding and re-encoding are unnecessary.The proposed algorithm is simple and efficient. Moreover,watermark can be extracted blindly without original images.Compared with the original video sequences before watermark,PSNR of watermarked frames is reduced slightly.The two algorithms put forward by this paper can satisfy the invisibility of watermark.At the same time,they have good robustness to withstand frame-deleting,frame-inserting and noise attack.