基于扩展Zig-zag变换的数字图像置乱方法

文章针对传统数字图像置乱方法过于复杂的问题,提出一种利用扩展的Zig-zag扫描变换对数字图像进行置乱的方法。针对单方向的Zig-zag变换造成某些像素点位置始终不变的问题,提出从四个方向进行多次Zig-zag迭代置乱,并将四个方向的迭代次数作为密钥以便对置乱的图像进行还原。实验结果表明,该算法具有很好的图像置乱效果,安全性较高,且算法简单操作易实现。

Method of Digital Image Scrambling Based on Extended Zig-zag Transformation

As the traditional digital image scrambling methods are too complicated,a new method using extended Zig-zag scanning for digital image scrambling is proposed.In order to avoid the problem that single direction of the Zig-zag transform may cause positions of some points keep constant unchang,the solution which conducts Zig-zag iteration scrambling repeatedly from four directions is put forward,and the iteration times with four directions will be as the key to recover the scrambled image.The experiment results show that the algorithm has a good image scrambling effect,high safety,and the algorithm is simple and easy to realize.