傳統的光學加密方法分為兩類,一種是基于聯合變換相關器的加密方法,第二種是基于
匹配濾波相關器的加密方法。為了提高光學元件的衍射效率和系統的實際可操作性,本文綜合兩種傳統的加密方法的優勢,利用多重相位恢復算法的思想,對算法進行改進,實現了在聯合變換相關器上的純相位加密方法,有效改善了識別圖像的質量,并給出了計算機仿真和光學試驗結果,證明了這種方法的正確性和可行性。
關鍵字: 圖像加密, 相關器, 雙相位
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