基于直方图修正的H.264视频加密域可逆信息隐藏

为实现视频加密域的可逆信息隐藏,首先使用随机二进制序列对运动矢量的符号位进行加密,然后通过运动矢量直方图修正进行信息的嵌入。信息嵌入算法是对称的,这样可以保证嵌入过程与提取过程均可分离,这样第三方管理者可以在不进行解密的情况下对存储的视频嵌入各种控制信息,保证了用户信息的隐私性。而视频的所有者在下载了视频后,无论是否进行解密,均可进行信息的提取。实验证明在拥有较大嵌入容量的前提下,实现了信息嵌入提取与视频加解密之间的可分离性,且算法完全可逆。

Reversible Data Hiding for Encrypted Video

In order to implement reversible data hiding for encrypted video, a special embedding algorithm is proposed in this paper. First, a random binary sequence was used to encrypt the signs of motion vectors, then base on histogram modification of motion vector, information would be embedded into the motion vectors. The embedding algorithm was symmetrical, the information embedding process and extracting process were all separable, then the third party can embed some control information into the video without decoding it, which can protect the privacy of users. When the legal owner of the encrypted video downloads the video, the information can be extracted with or without decoding the video. Experiments have proven that the embedding algorithm is reversible and the embedding capacity is large.