Invertible Semi-fragile Video Watermarking Algorithm Used for Content Authentication
用于内容认证的半脆弱可逆视频水印算法

This paper proposes an invertible semi-fragile video watermarking algorithm using a hash function to authenticate the MPEG-4 video contents. The proposed algorithm embeds two watermarks into I frame while encoding the YUV video to MPEG-4 format. One watermark using a hash function aims to authenticate the contents and embed the frame number for tamper localization between frames, and the other one based on direct coefficients and low-frequency coefficients is used for the detection of tamper localization within the frame. The experimental results show that the proposed algorithm is able to authenticate the video contents and detect the tamper localization, and it is robust for MPEG-4 compression. In addition, the proposed algorithm is exactly invertible, which means that the original video data is available as long as the watermarked video is credible.