基于H.264宏块内码率控制的隐写算法  

A Video Steganography Algorithm based on H.264 Macroblock Rate Control

作　　者：张家骥[1] 郭立[1] 王昱洁[1] 

机构地区：[1]中国科学技术大学电子科学与技术系,安徽合肥230026

出　　处：《信息安全与通信保密》2011年第10期82-85,共4页Information Security and Communications Privacy

基　　金：国家自然科学基金资助项目(批准号:61071173)

摘　　要：在H.264/AVC视频编码标准框架下,提出一种基于H.264宏块内码率控制的视频隐写算法,根据CSF函数对DCT变换频率进行分类,判别DCT变换块的不敏感频率,并对DCT块进行分类,最后通过秘密信息比特位指导DCT块不敏感频率系数的舍弃和选取。实验中进行了隐写容量测试、信噪比损失测试和视频压缩码流大小测试。实验表明,该算法在损失信噪比较小的情况下能嵌入较多的信息,并能保持原视频编码器的压缩特性。A novel video steganographic algorithm based on CSF and H.264 is presented.CSF function can be used to effectively discriminate the fast-moving blocks and slow-moving blocks in video.The algorithm is modified to distinguish the insensitive frequency and sensitive frequency for steganography,thus to realize blind extraction.Secret information is embedded according to the number of the insensitive frequency in a DCT block.Experimental results indicate that this algorithm could hide secret data of large capacity without noticeable distortion.

关 键 词：相对灵敏度函数 隐写 H.264 码率控制 

分 类 号：TN919.81[电子电信—通信与信息系统]