盲源分离图像加密的相关运算解密法  

Correlation calculation decrypting for BSS-based image cryptosystem

作　　者：林秋华[1] 党杰[1] 殷福亮[1] 

机构地区：[1]大连理工大学电子与信息工程学院,辽宁大连116023

出　　处：《通信学报》2008年第1期109-114,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(60402013);辽宁省自然科学基金资助项目(20062174)~~

摘　　要：在盲源分离图像加密方法中,盲源分离解密的多幅图像在顺序和灰度值上存在不确定性,且解密强相关图像前需要去相关预处理。为了解决这两方面问题,利用密钥图像已知且与明文图像不相关的特点,提出了一种基于相关运算的图像解密新方法。该方法根据加密方程计算加密图像与密钥图像的相关阵;通过忽略较小的相关阵,得到与明文图像几乎相同的解密图像。仿真实验和性能分析结果表明,该方法解密质量好、速度快,且适于各种图像。For a blind source separation （BSS） based method for encrypting multiple images, the multiple decrypted images by BSS may have changed order and reversed pixel values. In addition, decorrelation preprocessing must be performed prior to decryption of strongly correlated images. To solve the two problems, a novel method for image decryption was proposed based on correlation calculation since the key images are known for legal users and are independent of the original images. Specifically, the correlation matrix between the encrypted images and the key images was calculated according to the encryption equation, the decrypted images are then obtained by ignoring the smaller correlation matrix between the original images and the key images. The results of computer simulations and performance analyses demonstrate that the proposed method can provide much higher quality and much faster speed compared to the BSS decryption, and also can directly decrypt varied images.

关 键 词：盲源分离 图像加密 图像解密 相关运算 

分 类 号：TN911.72[电子电信—通信与信息系统]