一种Arnold变换和骑士巡游算法相结合的医学图像置乱法

摘要

图像加密对保护医学图像安全性具有重要意义.针对Arnold周期性安全问题,利用Arnold变换和骑士巡游算法结合解决此问题.先迭代Arnold变换置乱图像,再把置乱图分成大块和小块,最后骑士巡游算法从局部和全局对图像进行置乱加密.该方法具有置乱度高和安全性高等优点.%Image encryption is very important in protecting medical images. To solve the security problem of Arnold's periodicity,a method of combining Arnold and Knight's Tour algorithm is proposed. Firstly,an image is scrambled in an iterative process of Arnold. Secondly,it is cut into large and small areas,Lastly,it is scrambled by knight's tour algorithm locally and globally.The method enjoys the advantages of good scrambling and high security.