矩形孔菲涅尔衍射图像得计算程序，读者可以修改相关参数，以观察不同形式得菲涅尔衍射图像。-Rectangular aperture Fresnel diffraction image obtained calculation program, readers can modify the relevant parameters to observe the different forms have Fresnel diffraction image.

使用gdal实现影像的矩形裁剪，可以根据需要确定起始位置以及确定要裁剪的大小。-Use gdal achieve rectangle cropped image, you can determine the starting position and to determine the size needed to be cropped.