锯齿空间填充曲线耦合压缩感知的彩图灰度化实时加密算法

Color Image Gray Out Real-Time Encryption Algorithm Based on Saw-Tooth Space Filling Curve Coupled Compressive Sensing

针对当前彩色图像加密算法都是对RGB分量中所有像素加密,无法避免对次要像素的加密,使其加密效率较低,且加密后仍为彩色密文,增大了传输负载等不足。对此,本文提出了锯齿空间填充曲线耦合压缩感知的单通道彩图RGB分量灰度化实时同步加密算法。设计锯齿空间填充曲线,提高图像像素置乱率;嵌入压缩感知,对彩图RGB三分量进行同步压缩,得到三个测量矩阵,并构造灰度化函数,将图像演变为灰度图像;基于感兴趣区域原理,设计感兴趣像素提取方案,获取灰度图像的感兴趣像素矩阵,使其只扩散感兴趣像素,大幅度降低了像素扩散数量;设计加密函数,扩散感兴趣像素矩阵,再将加密像素映射到置乱图像相应位置,获取灰度密文。仿真结果显示:本文算法高度安全,能够得到灰度密文;与其他彩色加密算法相比,该算法具有更高的加密效率,可满足实时加密要求。

the low encryption effective which can not meet the requirement of real time was induced by encryption all the pixels of image and the cipher was still color which increasing the transmission loads after encryption in current algorithms,. So the color image real-time encryption algorithm based on pixel of interest coupled compressive sensing was proposed. The pixel of interest chooses mechanism was designed by principle areas of interest to avoid encrypting image non-significant pixels; Embedding the compressive sensing,the permutation pixels were synchronous compression. Finally,the encryption function was designed to diffusion the permutation pixels to obtain the gray cipher. The simulation results showed that this algorithm highly security,and the encryption efficiency of this algorithm was higher which can meet the requirement of real time comparison with other color image encryption algorithms.