中文摘要：

提出了一种基于 H.264的视频信息隐藏算法．该算法引入菱形编码，通过轻微调制运动矢量实现信息的嵌入过程．菱形编码不仅可以有效减少运动矢量修改率，同时可以提高嵌入容量．在嵌入过程为减少信息嵌入对码率和视频图像质量的影响，选择纹理复杂区域和较大运动矢量为嵌入点．实验结果表明，该算法在确保良好视频质量的条件下，可以满足大容量信息嵌入的要求，对压缩码率的影响较小．

英文摘要：

A steganography algorithm based on motion vectors of H.264 is proposed in this paper. The algorithm in-troduces the diamond coding to achieve information hiding by a slight modulation of motion vectors. The diamond coding can not only effectively reduce the modification rate of motion vectors but also improve the embedding capac-ity. In the embedding process, in order to reduce the effects of information embedding on bit rate and video image quality, regions with complex textures and larger motion vectors are selected as the embedded points. Experimental results show that the algorithm ensures good video quality and large embedding capacity, with little effects on bit rate.