半脆弱视频水印是一种进行视频数据内容完整性认证的重要技术。为了得到具有更强认证能力的半脆弱视频水印信息，提出了一种新的方案，该方案采用DCT块组能量关系特征和块灰度均值特征相结合的双特征提取方法构成水印信息，然后将水印信息进行Turbo编码，再利用改进的DEW算法实现水印的嵌入。双特征提取算法可以克服单特征提取的不完备性，增强篡改判断和定位能力，Turbo编码可以提高水印信息的鲁棒性，降低认证虚警率。实验结果表明，该算法在不破坏视觉质量的基础上，能够对常见的篡改操作进行完备的认证，虚警概率小。

Semi-fragile video watermarking is an important technology of videos’ content authentication. A novel semi-fragile watermarking scheme is proposed in this paper in order to improve authentication abilities. The scheme obtained the watermarking information by adopting double-feature extraction which was a combination of DCT blocks’ relation and grayscale blocks’ relation. The watermark was embedded into the host video with an improved DEW algorithm after it had been Turbo coded. The double-feature extraction algorithm can conquer single-feature’s imperfection to improve the abilities of tamper estimation and orientation. Turbo code can improve the robustness of watermark and decrease the probability of false positive. Experimental results demonstrate that it will not degrade the visual quality of original videos, and it can authenticate normal tamper operations. Besides the scheme have little probability of false positive.