Image Encryption Based on Joint Transform Correlator and Phase-shifting Interferometry
基于联合变换相关和相移干涉的图像加密

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 the optical encryption technique and digital encryption technique.Its feasibility and validity were verified by a series of computer simulations.