Algorithm study on video watermarking authentication based on AVS in compressed domain

In order to improve the security of digital video, a watermarking-based content authentication scheme is proposed for AVS in compressed domain. It makes use of the 3-dimensional signatures of video space, and the structure signature is built from the energy relationship between block of I frames, GOP and frame structural information. Furthermore, the mid-frequency DCT coefficients and motion vectors are both utilized for watermark embedding. In additional, Authentication is made by comparison between the extracted dual watermarking and restructure of the signature. The experimental results demonstrate that the proposed approach has better capability of tampering location.