An improved scheme for data hiding in encrypted H.264/AVC videos

作者：Xu, Dawen^*; Wang, Rangding; Shi, Yun Q.

来源：Journal of Visual Communication and Image Representation, 2016, 36: 229-242.

DOI：10.1016/j.jvcir.2016.02.002

• Data hiding
• Encrypted domain
• H.264/AVC
• Context-adaptive variable length coding (CAVLC)
• Code-word substitution
• Data extraction
• Code-word pair
• Data embedding capacity

Recently, a novel scheme to hide data into encrypted H.264/AVC videos using code-word substitution has been proposed by Xu et al. However, the statistical analysis of CAVLC code-words demonstrate that Xu et al.'s work does not fully exploit redundancy existing in CAVLC code-word for data embedding. In this paper, an improved version of Xu et al.'s data hiding method in encrypted H.264/AVC videos is proposed. Specifically, when suffixLength is equal to 1, data embedding is performed by paired code-word substitution. When suffixLength is greater than 2, not the single code-word substitution but the multiple-based notational system is adopted for data embedding. Experimental results have demonstrated that the improved method is indeed capable of providing a larger embedding capacity in comparison with Xu et al.'s method. Moreover, both encryption and data embedding can be accomplished without affecting the coding efficiency of H.264/AVC by keeping exactly the same bitrate.

• 出版日期2016-4
• 单位宁波大学; 宁波工程学院