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中文摘要：
提出了一种基于帧内预测模式调制的H．264视频信息隐藏算法。在模式选择过程，通过调制帧亮度的4×4块的预测模式实现信息隐藏。通过引入嵌入／提取矩阵，使得在修改一个4×4块的预测模式时，能够嵌入3比特信息。在信息提取过程，不需要原始视频，也不需要完全解码，只需对帧内预测模式解码即可。实验结果表明，本文算法能大幅提高信息隐藏容量，且保证了视频感知质量，对比特率变化影响不大。
英文摘要：
A new information hiding algorithm with prediction mode modulating for H. 264 video is pro- posed. The secrect information is embedded by modifying intra-prediction modes of intra-4 × 4 blocks during the mode decision process. By utilizing an embedding/extracting matrix, three watermark bits are hidden while only one intra-4 × 4 block＇s mode is changed. The detection of hidden information needs no original media,and merely requires to decode the intra-prediction modes of bit stream rather than to de code the whole video. Experimental results demonstrate that the proposed approach can effectively im- prove the capacity of hidden information with little bit rate increase and no quality degradation.
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A semi-fragile watermarking scheme for authenticating audio signal based on dual-tree complex wavele
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