纯相位图象的实值编码

The real-value encryption for the full phase image

一种用于纯相位图象加密的实值编码方法 ,待编码的纯相位图象与一个随机相位掩膜一起作傅立叶变换 ,取其实部作为编码图象。已编码的图象和随机相位掩膜的傅立叶变换相加作傅立叶反变换 ,记录反变换的光强分布 ,再通过图象灰度变换可以恢复图象。该编译码方法简单 ,编码图象是一个实值图象 。

A real-value encryption and decryption method is proposed for the optical image security system.A full-phase 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 values of the inverse-Fourier transformed image is adjusted.It 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.