基于改进零树编码的图像联合压缩加密算法.pdfVIP

第 12 卷第 1 期 光子学报 Vo l. 12 No. 1 2013 年 1 月 ACT A PHOTONICA SINICA January 2013 dOÍ:10. 3788/gzx 0121 基于改进零树编码的图像联合压缩加密算法 邓家先，任玉莉 (海南大学信息科学技术学院，海口 570228) 摘 要:在认真研究算术编码和算术加密的基础上，提出了一种基于改进零树编码的图像联合压缩 加密算法.使用密钥对图像压缩产生的原始上下文和原始判决进行修正，实现了图像联合加密.阐 述了上下文修正和判决修正算法的规则，对其安全性进行分析.结合比特平面编码技术，可以使用 不同密钥对不同小波分辨率的系数分别加密，实现分辨率选择性加密，以满足不同应用需求.对零 树编码进行改进，加入自适应算术编码，并对联合压缩加密算法进行仿真.结果表明:相对原始图像 压缩算法而言，所提出的图像联合压缩加密算法具有基本相当的压缩效率;相对区间分裂的联合加 密算法而言，所提出算法具有更好的安全性. 关键词:图像压缩;改进零树编码;联合压缩加密;算术加密;渐进性选择性加密 中图分类号:TN919. 81 文献标识码:A 文章编号:1004-4213(2013)01-0121-6 Image Joint Compression-encryption AIgorithm ßased on Improved Zero-tree Coding DENG Jia-xia口， REN Yu-li (Collegeof lnfοrmωtion Science and Technology , Hainan University , Hαz走οu 570228 , China) Abstract: On the basis of careful research on arithmetic coding and arithmetic encryption , a kind of image joint compression encryption algorithm based on improved zero-tree coding is proposed , where a key is used to modify the original context and the original decision produced in the process of image compression , and the image joint compression-encryption is realized in this way. In this work , the rule of the context modification and the decision modification algorithm is discussed and its security is analyzed. In order to meet different application requirements , different keys are used to encrypt separately the different wavelet resolution coefficients during bit-plane coding , so the resolution selective encryption is realized. Moreover , the