【摘要】 加密是视频安全传输的关键技术之一。通常视频加密是在一定的压缩框架下进行加密,由于变换后系数分布一般都具有一定的统计特性,而对变换系数进行完全置乱就会破坏这些特性,导致比特率增加。从便于加密的角度出发,联合考虑视频的压缩和加密,提出一种基于匹配追逐(matching pursuit)的视频压缩加密方案,该方案首先构造基于匹配追逐的视频压缩平台,由于视频信号经匹配追逐分解后,其分解系数的分布取决于字典的选取和输入信号空间特性,即变换系数的分布是随机的,再对变换系数进行完全加密,提高数据的安全性而不会改变压缩效率。实验结果证明了该方案的有效性。更多还原

【Abstract】 Encryption is one of the key techniques of video security.Usually video encryption is based on a given compression scheme.Scrambling the transform coefficients will change the statistical characteristics and result in the increase of the bit rate of the compressed video.In the view of encryption,this paper proposes a union coding scheme for compression and encryption based on the matching pursuit(MP).On the compression platform based on this method,the decomposed coefficients are of random distribution.The complete scrambling will not increase the bit rate,but with higher security.Experimental results are given to demonstrate the efficiency of this method.更多还原