Digital watermarking for copyright protection of MPEG2 compressed video

Digital watermarking is the technique which embeds an invisible signal including owner identification and copy control information into multimedia data such as audio, video, images, for copyright protection. This paper proposes a new watermarking technique which is appropriate for MPEG2 video coding system by extending the direct sequence spl ead spectrum. The proposed watermarking scheme in this paper minimizes es the perceptual degradation of video quality caused by the embedded water mark through controlling the strength and area of embedding with respect to the global and local characteristics of the video sequences. And this technique can also directly extract the embedded watermark from the watermarked MPEG2 compressed video stream without using original video sequences. Simulation results show that the proposed scheme is robust to various attacks to remove;the embedded watermark and is feasible for real time system implementation.