纯相位图象的实值编码  

The real-value encryption for the full phase image

作　　者：李萍[1] 李榕[1] 常鸿森[1] 

机构地区：[1]华南师范大学物理系,广州510631

出　　处：《激光杂志》2004年第2期37-38,共2页Laser Journal

基　　金：广东省自然科学基金 ( 0 2 1 0 89) ;广东省教育厅自然科学研究项目 (Z0 2 0 2 0 )资助

摘　　要：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.

关 键 词：纯相位图象 实值编码 图象加密 随机相位掩膜 灰度变换 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] TN919.81[自动化与计算机技术—计算机科学与技术]