摘要： 提出了一种基于MPEG-I/II视频内容认证的半脆弱水印方案，该水印方案对视频内容恶意篡改敏感，对类似于视频重编码等内容保持操作鲁棒。水印方案完全建立在视频压缩域之上，利用视频图像块与块之间不变的能量关系构建基于内容的特征码，加上版权信息、控制信息生成完整的水印认证码，运用边信息通信方式嵌入视频VLC域。通过对提取出的水印信息和重构的认证码进行比较，实现了对视频的内容认证。该文最后给出了实验结果，证明了该方案的可行性。

关键词: 视频水印, 半脆弱, 内容认证, 特征编码

Abstract: This paper presents a semi-fragile watermarking scheme based on MPEG-I II videos authentication. While being fragile to malicious manipulations, the scheme is robust against content-preserving manipulations like re-encoding. A content based on feature code is derived from the multimedia document, basing on a constant energy relationship between two groups of blocks, being added copyright and control information to construct the authentication code, which is robustly embedded in the VLC domain of MPEG-I II video as communications with side information. In the process of detection, it compares the content based on feature code and the retrieved watermark to detect and locate manipulations and presents experimental results to demonstrate the feasibility of the scheme.

Key words: Video watermarking, Semi-fragile, Content authentication, Feature code