彩色图像置乱方法研究

Research on Color Image Scrambling Algorithm

这里主要研究彩色图像的置乱方法,目的是提高置乱效果及置乱效率。分别研究了基于像素灰度变换的彩色图像置乱方法及基于像素位置变换的彩色图像置乱方法,仿真分析了2种置乱方法的不足,提出了一种新的基于Arnold变换的彩色图像置乱方法。采用同时改变像素位置及灰度值的方法,兼顾了置乱图像在视觉上及理论上的置乱效果。仿真实验表明该置乱算法提高了置乱度,节约了恢复时间,是一种简单、高效的彩色图像置乱方法。

This paper mainly focuses on scrambling algorithm in color image.With purposes to enhance the scrambling effect and improve the scrambling efficiency,two algorithms based respectively on changing pixels’ gray value and shifting pixels’ position,including are discussed by simulation,including their imperfections.A novel color image scrambling algorithm based on Arnold transformation is proposed,which simultaneously changes the location and the gray value of pixels.Both the scrambling effect in theory and the effect in vision are taken into account.Simulation results show that this algorithm could improve scrambling degree and reduce restoring time,and thus is a simple and efficient scrambling method.