Video digital watermark research based on MPEG4

This paper, based on DCT transform and image scrambling, presents the digital watermark embedding scheme. Embedding and extracting watermark in compressed video field are carried out in this way. In this paper, DCT transform is used as MPEG4 use DCT transform to compress. Before watermark is embedded, scrambling image is adopted to transform watermark information. Also, the embedding position of the watermark bit is modified by one chaos sequence, and this method promotes the robustness and the security of the watermark. Experiments make it clear that the scheme adopted in this paper satisfy the requirements for imperceptibility, robustness and security.