一种基于EZW的ROI图像联合压缩加密算法  

Joint Compression-encryption Algorithm for ROI Image Based on EZW

作　　者：邓海涛[1] 邓家先[1] 邓小梅[1] 

机构地区：[1]海南大学信息科学技术学院,海南海口570228

出　　处：《电视技术》2013年第9期45-51,63,共8页Video Engineering

基　　金：海南省自然科学基金项目(613155)

摘　　要：提出一种基于EZW编码的ROI图像联合压缩加密算法,阐述了上下文修正和判决修正的原理及实现,对所提出算法的安全性进行了评估。对算法进行仿真,结果表明相对于原始图像压缩算法,该算法的重构图像基本具有相同的压缩效率;相较于提升系数的ROI方法,该算法采用小波域图像分割,不需要对ROI形状信息进行编码,并可灵活调整ROI与背景区域(BG)的重构质量;相较于区间分裂算术编码器而言,该算法采用自适应算术编码,可获得更好的安全性;结合比特平面编码技术,使用不同密钥对ROI不同小波分辨力的系数分别加密,实现分辨力选择性加密,以满足不同应用需求。A joint algorithm based on EZW coding is proposed. The principle of the context modification and the decision roodification described. Finally, the security and usability of the algorithm is analyzed and evaluated. The simulation results show that the proposed ROI image joint compression-encryption algorithm has the same compression efficiency compared with the original image compression algorithm. Compared with the methods of the lifting ROI＇ coefficient, the algorithm can adjust flexibly the quality of reconstructed image between ROI and background region （BG） , without coding for ROI shape. And the proposed algorithm, based on adaptive arithmetic coding, has better security than the joint compression-encryption algorithm based on the interval splitting. In order to meet different application,different keys are used to encrypt separately the different wavelet resolution coefficients during bit-plane coding,to make sure the resolution selective encryption is realized.

关 键 词：联合压缩加密 ROI EZW 比特平面编码 自适应算术编码 

分 类 号：TN918.91[电子电信—通信与信息系统]