基于随机相位实值编码的光学图像加密

提出了一种用于图像加密的随机相位实值编码方法,待编码的纯相位图像与一个随机相位掩膜一起作傅里叶变换,取其实部作为编码图像.已编码的图像和随机相位掩膜的傅里叶变换相加作傅里叶反变换,反变换的光强可以准确地重建原图像.该编译码方法简单,编码图像是一个实值图像,便于计算机打印或显示输出.

Optical Image Security Based on Random Phase Real-value Encryption

A random phase real value encryption and decryption method is proposed for the optical image security system.A phase only image to be encrypted together with a random phase mask is Fourier transformed and real part of the result is used as an encrypted image. The addition of encrypted image and the Fourier transformed of the random phase is inverse Fourier transformed.The intensity of inverse Fourier transformed image gives the exact original image. The method of encryption and decryption is simply performed and encrypted image is real valued,so it is convenient for print or display on computer.