基于联合变换相关和相移干涉的图像加密  

Image Encryption Based on Joint Transform Correlator and Phase-shifting Interferometry

作　　者：沈丽娜[1] 李军[1] 常鸿森[1] 

机构地区：[1]华南师范大学物理与电信工程学院,广州510006

出　　处：《光子学报》2008年第10期2114-2117,共4页Acta Photonica Sinica

摘　　要：提出了一种在联合变换相关器结构中引入三步相移干涉和二元置乱技术的图像加密方法.用纯相位空间光调制器同时调制原始图像和两个随机相位掩模,利用三步相移技术分别将图像信息和主密钥加密为全息图,并用CCD在输出面上接收,再利用二元置乱技术置乱图像信息的全息图.在获得置乱密钥和附加密钥的情况下,可以通过一定的算法快速、清晰的重建原始图像.用计算机仿真验证了它的可行性和有效性.An image encryption method combining three steps phase-shifting interferometry with dyadic permutations in the joint transform correlator based architecture is proposed. With a phase-only spatial light modulators the original image and two random phase masks are modulated simultaneously. The image information and the principal key are encoded to interferograms by the three phase-shifting interferometry and the interferograms are recorded by a CCD camera at the output plane; then the interferogram of the original image by the dyadic permutations is permuted. With the permutation key and the supplementary keys known,the clear retrieved image can be obtained at high speed by certain algorithm. This method is a combination of were verified b Key words. I permutations the optical encryption technique and digital encryption technique. Its feasibility and validity y a series of computer simulations.

关 键 词：图像加密 联合变换相关 相移干涉 二元置乱 

分 类 号：O438[机械工程—光学工程]