摘要
在H.264帧间预测环节,基于改进的Exp-Golomb码字结构思想,引入信息变长分组概念,将标识信息划分为若干长度为2或3bits的互不重复的7类信息组,并设计帧间预测模式与待隐藏信息组的映射规则,通过调制当前宏块的帧间预测模式实现信息隐藏。宿主宏块位置由"嵌入点排除规则"确定,每次隐藏2或3bits标识信息,满足算法大容量需求。标识信息提取过程无需原始视频,只须对帧间预测模式进行解码即可完成,符合实时性要求。实验仿真结果证明了算法的有效性。
By using the improved structure of Exp-Golomb code, the conception of information variable length group in the inter-prediction process of H.264 video coding standard is introduced. The algorithm divides the identification information into some information groups with two or three bits in each group. These groups are seven different categories, which form total binary codes. Based on the mapping rule between inter-prediction modes and information groups, information hiding is accomplished by modulating the current macroblock＇s inter-prediction mode. The positions of host macroblock are determined by the proposed embedding exclusion rules and each one can hide two or three bits information, which meets the large capacity requirement. The detection of hidden information needs no original video and it merely requires decoding the inter-prediction modes from bit-stream rather than the whole video, which meets the requirement of video real-time processing. The experimental results also prove that it is an extremely effective algorithm.
出处
《电路与系统学报》
CSCD
北大核心
2012年第6期42-48,共7页
Journal of Circuits and Systems
基金
国防科研项目
国家教育部博士点基金项目(20060359004)
关键词
信息隐藏
H
264
AVC
信息变长分组
帧间预测模式选择
information hiding
H.264/AVC
information variable length group
inter-prediction mode decision
