中文说明：
Gerchberg-Saxton算法实现对图像相位的恢复，输入两张图片其中一张作为目标振幅。是对GS算法很好理解的一个程序
English Description：
Gerchberg Saxton algorithm realizes the restoration of image phase, and inputs one of two images as the target amplitude. GS algorithm is a good understanding of the program