Restricted H.264/AVC video coding for privacy region scrambling

Scrambling is widely used to protect privacy in surveillance video. However, as a critical issue in privacy protected video scrambling, drift error has not been adequately studied. In this paper, we focus on drift error prevention for different elements scrambling in privacy protected H.264/AVC video, which is the prevailing coding standard. A restricted coding scheme is proposed to prevent drift error in Transform Coefficient (TC), Intra Prediction Mode (IPM) and Motion Vector (MV) scrambling, respectively. Experiments show that the proposed scheme effectively prevents drift error with coding efficiency dramatically improved.