一种改进的随机纯双相位图像加密算法

传统的光学加密方法分为两类,一种是基于联合变换相关器的加密方法,第二种是基于
匹配滤波相关器的加密方法。为了提高光学元件的衍射效率和系统的实际可操作性,本文综合两种传统的加密方法的优势,利用多重相位恢复算法的思想,对算法进行改进,实现了在联合变换相关器上的纯相位加密方法,有效改善了识别图像的质量,并给出了计算机仿真和光学试验结果,证明了这种方法的正确性和可行性。
关键字: 图像加密, 相关器, 双相位
Abstract: The traditional optical encryption methods are classified into two kinds, one is based on the joint transform correlator, the second is based on the matched filter. In this paper, in order to enhance the diffraction efficiency of optical component and actually operability of the system, through colligating the advantages of both traditional encryption methods, utilizing the idea of multiple-phase recovery algorithm, we have improved the algorithm, came true pure phase encryption method on the join transform correlator, effectively ameliorated the quality of the image recognition, and took out the emulational and optical test results. We also prove that the identification on joint transform correlator by using simple-phase function is correct and feasible.
Keywords: Image Encryption, Correlator, Double Phase