一种基于H.264视频内容认证的水印算法

提出一种基于H.264视频内容认证的半脆弱水印,该水印方案对视频内容恶意篡改敏感,而对于视频重编码等内容保持操作鲁棒。水印方案建立在视频压缩域上利用图像块之间不变的能量关系构建基于内容的特征码。由于DCT系数块能量主要集中在低频部分,所以用低频部分来生成特征码,用高频部分来嵌入水印。实验结果证明算法是有效的,并且较好地实现了篡改定位。

A Watermarking Algorithm based on H.264 Videos for Content Authentication

This paper presents a semi-fragile watermarking scheme based on h. 264 videos authentication, while being fragile to malicious manipulation , the scheme is robust against content-preserving manipulations like re-enconding. A content based on feature code is derived from the multimedia document, basing on a constant energy relationship between two groups of blocks. The lower DCT region is used to form the feature codes while t he higher one is used to embed watermarks. Experimental results on video objects demonstrate the effectiveness of the scheme, which enhance the capability of exact detection and localization of tempered areas.