修改标志位的大容量无损HEVC信息隐藏方法  

Large-Capacity Lossless HEVC Information Hiding Based on Index Parameter Modification

作　　者：胡永健[1] 龚文斌 刘琲贝[1] 刘烁炜 朱美能[2] HU Yongjian;GONG Wenbin;LIU Beibei;LIU Shuowei;ZHU Meineng(School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640, Guangdong,China;Beijing Institute of Electronics Technology and Application,Beijing 100091,China)

机构地区：[1]华南理工大学电子与信息学院,广东广州510640 [2]北京电子技术应用研究所,北京100091

出　　处：《华南理工大学学报（自然科学版）》2018年第5期1-8,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：广东省科技计划国际协同创新项目(2017A05051002);广东省自然科学基金博士科研启动项目(2017A030310320);广州市科技计划项目(201510010275);中新国际联合研究院项目(206-A017023)~~

摘　　要：传统的视频信息隐藏方法大多通过修改视频的帧内预测模式、运动向量或预测残差系数来实现.然而,高效视频编码(HEVC)标准的高级运动向量预测(AMVP)技术同时利用相邻块的空域运动向量和时域运动向量来预测当前块的运动向量,通过在码流中保存预测运动向量的标志值来标识所使用的预测运动向量.基于这一特点,文中创新性地提出通过修改标志值来嵌入秘密信息.为了保证嵌密视频的质量,文中分析了标志值、预测运动向量以及运动向量残差之间的关系,然后对运动向量残差进行匹配修改,以此确保嵌密前后预测块的运动向量不变.实验结果表明,文中方法具有较大的嵌入容量和较小的比特率增加,且嵌密视频的质量与原始视频完全相同.Traditional video information hiding usually modifies intra-frame prediction modes,motion vectors or prediction residual coefficients for secrete message embedding.For HEVC(High Efficiency Video Coding)stan-dard,however,it ado pts an advanced motion vector prediction(AMVP)which uses both spatial motion vector and temporal motion vector of the adjacent block to predict the motion vector of the current block.The motion vector index is given to a prediction motion vector when it is used.Due to this new technique,this article first proposes to embed the secret information by modifying the index value.In order to guarantee the quality of the modified video,we analyze the relationship among the index value,the predicted motion vector and the motion vector residual so that we can accordingly modify the corresponding motion vector residual.This motion vector can remain unchanged after embedding.We control the capacity and bit rate change by means of a threshold.Experimental results show that our method has a larger embedded capacity and smaller bit rate increase.In particular,our method can ensure that the quality of embedded video is the same as the original video.

关 键 词：信息隐藏 高效视频编码 运动向量 高级运动向量预测 预测运动向量标志值 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]