基于上下文修正的ROI联合压缩加密算法  

ROI JOINT COMPRESSION-ENCRYPTION ALGORITHM BASED ON CONTEXT MODIFICATION

作　　者：邓小梅[1] 邓家先[1] 邓海涛[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：《计算机应用与软件》2013年第10期185-188,共4页Computer Applications and Software

基　　金：海南省自然科学基金项目(613155)

摘　　要：提出一种基于上下文修正的ROI图像联合压缩加密算法。对零树结构进行改进,引入自适应算术编码器,利用密钥对ROI图像压缩产生的原始上下文进行修正,修正后的上下文与原始判决一起送入自适应算术编码器中实现对ROI图像的联合压缩加密。为了满足不同权限用户的需求,对感兴趣区域按树型结构扫描的方式进行加密,并对该算法进行仿真。结果表明:在相同码率条件下,与原始压缩算法相比,所提出的算法具有基本相当的压缩效率;在压缩率保持不变的情况下,相对于区间分裂的算术编码而言,所提出的算法安全性能更好。The thesis proposes an ROI image joint compression-encryption algorithm based on context modification. It perfects the zero-tree structure, introduces an adaptive arithmetic encoder, and utilizes a key to modify the original context that is generated by ROI image compression. The modified context is sent into the adaptive arithmetic encoder together with the original decision to realize joint compression and encryption for the ROI image. In order to meet the demands of users with different privileges, encryption is carried out by tree structure scanning approach with regions of interest. In addition the proposed algorithm is simulated. Results show that, when code rate is constant, compared against the original compression algorithm, the proposed algorithm boasts of almost equivalent compression efficiency; when compression ratio keeps constant, compared against Interval Splitting algorithmic encoding, the proposed algorithm boasts of safety performance.

关 键 词：感兴趣区域 自适应算术编码 联合压缩加密 上下文修正 零树结构 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术] TN911.73[电子电信—通信与信息系统]