基于分数傅里叶变换的光学彩色图像加密

Optical color image encryption based on fractional Fourier transform

提出一种基于分数傅里叶变换相位编码并结合三色光栅的方法,实现光学彩色图像的加密.该方法采用三色光栅技术将一幅彩色图像调制为灰度图像,并采用分数傅里叶变换的相位编码进行加密.该方法不仅实验设备简单,成本较低,利于实现,而且可利用分数傅立叶变换的分数阶增加加密的重数,从而提高了安全性.模拟实验结果证明了该方法的有效性.

A fractional Fourier transform phase encoding combined with tricolor grating method is proposed for the optical color image encryption system.According to tricolor grating theory,a color image is modulated into a gray scale image,and then the gray scale image is encrypted by fractional Fourier transform phase encoding.With the tricolor grating,the system is simper and more practical.And due to the additional degrees of freedom provided by the fractional Fourier transform,the numbers of security keys can be ...