【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 ,通过计算机模拟实验验证了该方法在减小图像解密误差方面的有效性更多还原

【Abstract】 We propose a kinoform-based iterative random phase encryption method, in which the phase retrieval algorithm is divided into two steps: 1) random phas e encryption and 2) iteration solving for phase distributions of both the key ph ase plate and the kinoform. Since the iterations are executed between a Fourier sp ectrum and the kinoform, the decryption errors can be effectively depressed. By the quantization process for the phase distributions during the iterations, a me thod of increasing the abundance of design is used to depress the decryption err ors. The simulation results are presented at the end, which agree well with the theoretical analysis.更多还原