一种基于混沌的JPEG2000图像加密算法

首先设计出一个性能优异的基于混沌系统的矩阵置乱算法.由于JPEG2000图像小波变换后的重要信息多集中在小波系数的低频系数部分,图像加密算法只选择了小波系数的低频分量进行置乱加密.算法巧妙地避免了以往基于JPEG2000图像加密的一些缺点,很好地将加密、解密与图像的编码、解码相结合.最后,实验验证并分析了算法的可行性和优越性,实验证明该算法复杂度高、保密性好、加密效率高,而又未明显降低图像的压缩率,具有很好的加密特性.

JPEG2000 Digital Image Encryption Algorithm Based on Chaotic System

This paper designed a matrix scrambling algorithm based on the chaotic system firstly which has excellent performance.As most important image information after DWT was concentrated upon the part of the lowest approximation coefficient,the image encryption algorithm was designed only to scramble the lowest approximation coefficient matrix for encryption.Therefore,the algorithm,which overcomes some shortcomings existing in preceding image encryption based on JPEG2000 skillfully,well comebined the encryption,d...