基于残差三维直方图调整的H.264可逆信息隐藏

Three-Dimensional Histogram Modification Based on Residual Block for Reversible Data Embedding into Stereo H.264 Video

在H.264视频的可逆信息隐藏中,直方图调整是一种有效的嵌入算法.为了充分利用系数之间的相关关系,提升嵌入效率,本文在二维直方图调整算法的基础上提出了三维直方图调整的方案.该方案从经过量化离散余弦变换后的4×4块中随机选择三个交流系数作为嵌入单元,通过对该单元的值进行调整,实现信息的嵌入.实验结果显示,与二维直方图调整算法相比,本文算法在峰值信噪比（PSNR）下降不到0.1%的情况下,将嵌入容量最多提升了11.4%.

Among all the reversible methods of embedding data into stereo H.264 video,Histogram modification（HM）is an efficient technique.To make full use of relevance between the QDCT（Quantized Discrete Cosine Transformation）coefficients,a special algorithm based on three-dimensional histogram modification is proposed in this paper.The proposed method selects three AC coefficients as an embedding pair.By modifying the value of the pair,data can be hidden into the QDCT coefficients.Experiment proves that with decreasing less than 0.1%in PSNR,the embedding capacity could increase up to 11.4% compared with the previous algorithm.