GS算法的matlab例子，本例子仿真了一个圆形的光环结构，其它的参数见matlab中的注释-GS algorithm matlab example, the example of simulation of a circular ring structure, and other parameters, see the Notes matlab。

GS算法，图像经过多次傅里叶变换，最后提取图像的相位信息，加载空间光调制器，观察图像。-GS algorithm, the image after several Fourier transform, and finally extract the phase information of the image, loading the spatial light modulator, the observed image.

针对相位全息中的用傅里叶变换（fft2）来实现的GS算法-GS algorithm for phase hologram in the Fourier transform (fft2) to achieve