说明：  代码对2D二维傅里叶过程进行了描述；有助于傅里叶光学领域的基础概念的理解；对二维傅里叶变化过程中的matlab代码进行了简要介绍，有助于初学者理解
(The code describes the 2D two-dimensional Fourier process, helps to understand the basic concepts of Fourier optics, and briefly introduces the matlab code in the process of two-dimensional Fourier change, which is helpful for beginners to understand.)