一种改进的H.264运动估计信息隐藏算法

Improved Information Hiding Algorithm Based on Motion Estimation of H.264

基于H.264特有的1/4像素精度运动估计,提出一种改进的mH.264运动估计信息隐藏算法。通过修改宏块中每个分割块的最佳匹配位置,利用分割块匹配位置与待嵌二进制信息之间的映射规则,将信息隐藏到分割块的匹配位置中。信息的提取基于解码器中亮度像素内插过程,不需原始视频参与,属于盲提取机制。实验结果表明,改进的H.264运动估计信息隐藏算法在不明显降低视频质量的前提下提高了隐藏容量,降低了系统开销,具有较高的整体性能。

An improved information hiding algorithm based on H. 264＇s specific motion estimation with quarter-pixel precision was proposed. By modifying every sub-block＇s best matching position of macroblock and using the mapping rule between sub-block＇s position and binary information, the information is embedded in sub-block＇s position. Informa- tion extraction based on the interpolation process of luma pixels in decoder of H. 264 doesn＇t need the original videos and belongs to the blind extraction mechanism. The experiment results demonstrate that the improved information hi- ding algorithm in motion estimation of H. 264 increases the hiding capacity and decreases the system cost without decreasing the video quality conspicuously, which has higher integer performance than other algorithms.