基于相息图迭代的随机相位加密  

Kinoform-based iterative random phase encryption

作　　者：刘福民[1] 翟宏琛[1] 杨晓苹[2] 

机构地区：[1]教育部光电信息技术科学重点实验室,南开大学现代光学研究所,天津300071 [2]天津理工学院光电信息与电子工程系,天津300191

出　　处：《物理学报》2003年第10期2462-2465,共4页Acta Physica Sinica

基　　金：国家自然科学基金 (批准号 :6 0 1770 0 4 )资助的课题~~

摘　　要：提出了一种将随机相位加密和相位恢复算法中的求解附加相位分布分二步实施的加密方法 .由于该方法的实质是通过在随机谱和相息图之间进行相位恢复迭代以确定相息图和密钥的相位分布 ,因而能够减小图像的解密误差 .在相息图相位离散化的迭代过程中 ,采用增大设计冗余度的方法 ,降低了由相位离散化所带来的解密误差 .最后 。We propose a kinoform-based iterative random phase encryption method, in which the phase retrieval algorithm is divided into two steps: 1) random phase encryption and 2) iteration solving for phase distributions of both the key phase plate and the kinoform. Since the iterations are executed between a Fourier spectrum and the kinoform, the decryption errors can be effectively depressed. By the quantization process for the phase distributions during the iterations, a method of increasing the abundance of design is used to depress the decryption errors. The simulation results are presented at the end, which agree well with the theoretical analysis.

关 键 词：相息图 迭代 随机相位加密 相位恢复算法 二元光学 离散化误差 光学图像加密 光学防伪 

分 类 号：O438[机械工程—光学工程]