采用基于记忆的模拟退火法对双随机相位加密中的相息图进行优化设计 ,并用该法分别对一个二元图像和一个灰度图像进行了模拟实验 .实验结果表明 ,在不增大设计冗余度的情况下 ,运用该方法可降低相息图和密钥的相位量化带来的误差 ,得到与原加密图像质量几乎相同的解密图像 . The phase diagram of double random phase encryption is optimized by memory-based simulated annealing method, and a binary image and a grayscale image are simulated by this method respectively. The experimental results show that without increasing the design redundancy In the case of redundancy, this method can reduce the error caused by the phase quantization of the phase diagram and the key, and obtain a decrypted image with almost the same quality as the original encrypted image.