A video watermarking scheme for AVS based on motion vectors

To achieve copyright protection by noticing the serious problem of copyright piracy, a novel watermarking algorithm based on motion vector of AVS (audio video coding standard) was proposed. During the inter prediction step of AVS video compression standard, watermark embedding is implemented by modifying the resolution of the motion vectors of partition blocks in different macroblock partitions. The modulation is based on the mapping rules between the motion vector resolution and the watermark bits. At last, the prediction modes of current macroblock is determined using standard AVS coding algorithm which will ensures that the best prediction mode is selected for current watermarked macroblock. The experimental results show that the presented watermarking method achieves comparatively high embedding rate without complicated computation, and has almost no impact on video bitrate and video quality subjectively as well as objectively.