混沌和小波变换的图像加密压缩算法  

An image encryption and compression algorithm based on chaos system and wavelet transform

作　　者：陈鸿[1] 柏森[2] 刘博文[2] 

机构地区：[1]重庆电子工程职业学院机电学院,重庆401331 [2]重庆通信学院信息工程系,重庆400035

出　　处：《重庆大学学报（自然科学版）》2014年第6期65-70,共6页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(61272043);重庆市基础与前沿研究计划项目(cstc2013jjB40009)

摘　　要：研究了一种基于混沌和小波变换的图像加密压缩算法。首先,是将4幅涉密图像分别进行一级小波变换,再把4个变换后的低频分量组成一个二维系数矩阵,采用混沌序列对其进行置乱加密,然后将加密后的系数矩阵分解为4个相同尺寸的二维系数矩阵,最后进行小波逆变换得到1幅加密压缩后的图像。该算法把混沌和小波变换结合起来,实现了加密和压缩同时进行,实验仿真和分析表明,算法具有良好的加密和压缩性能。An imag transform （DWT） e encryption and compression algorithm based on chaos system and discrete wavelet is studied in this paper. Firstly,four original secret images are transformed by DWT,and then the four low-frequency components are used to compose a two-dimensional coefficient matrix. The matrix is scrambled and encrypted by the chaos system, and then encrypted coefficient matrix is decomposed into four two-dimensional coefficient matrixes. Finally, an encrypted compressed image is obtained by the inverse DWT using the four decomposed two-dimensional coefficient matrices. Encryption and compression are realized at the same time in this algorithm which realizes the combination of chaos and wavelet transform, the experimental simulation and analysis show that the algorithm has good encryption and compression performance.

关 键 词：图像加密 图像压缩 混沌 离散小波变换 

分 类 号：TN99[电子电信—信号与信息处理]