中文摘要：

提出了一种基于H.264/AVC低比特率视频流的快速半脆弱水印算法。该算法一方面将I帧DCT量化残差矩阵能量值E的大小作为嵌入鲁棒水印的判决条件,以增强水印的鲁棒性和透明性,降低对编码比特率的影响;另一方面通过限制P帧运动矢量的搜索范围和估计精度嵌入脆弱水印,以提高水印嵌入的实时性。鲁棒水印与脆弱水印相结合有效地实现视频版权保护和内容完整性认证。实验结果表明,该算法实时性高、复杂度低,具有较好的率失真特性。

英文摘要：

This paper proposed a real-time semi-fragile watermark algorithm based on H.264/AVC low bit-rate video stream,could achieve jointly copyright protection and content authentication by embedding the robust watermark and fragile watermark.This paper introduced I-frame block＇s energy E as a condition to embed robust watermark,and it could enhance robustness and transparency of the watermark.Embedded fragile watermark through restrict the range and the precision of the P-frame motion vector estimation.Experimental results show the algorithm has lower complexity and better rate-distortion characteristic.It can meet the needs of real-time processing of video.