一种压缩图像加密方法  

An Encryption Algorithm for Compressing Images

作　　者：刘春生[1] 

机构地区：[1]郑州电力职业技术学院预科教学部,河南郑州451450

出　　处：《河南教育学院学报（自然科学版）》2009年第4期32-37,共6页Journal of Henan Institute of Education(Natural Science Edition)

基　　金：河南省自然科学基金项目(072300410230)

摘　　要：在总结图像的加密方法和过程基础上,引入Lorenz混沌映射生成混沌序列,并通过混沌序列产生加密向量,然后用加密向量在图像的空间域和DCT域对图像进行复合加密,并对加密效果进行全面的评估,也初步建立了图像加密效果的评价体系,提出了四维测定的概念.分析和实验结果表明,这种压缩图像的加密方法具有较快的运算速度、较高的加密强度和相应的压缩性能,而且评价体系也是有效的参考.On the basis of summarizing encryption method and process on image, introduce Lorenz chaotic map, use encryption vector created by chaotic map to encrypt image in space domain and DCT domain at same time, and evaluate the encryption effect comprehensively. An evaluated system for image eneryption effect is set up preliminarily and the concept of four - dimensional evaluation is defined. Experimental and analytical results demonstrate that the algorithm for encryption has faster operation speed, higher eneryption robust and corresponding compressed pertormance. The evaluation system is effective reterence.

关 键 词：压缩图像 混沌映射 DCT系数 复合加密 四维测定 评价体系 

分 类 号：TP317.4[自动化与计算机技术—计算机软件与理论] TP391.41[自动化与计算机技术—计算机科学与技术]