该压缩文件包含两个，直接调用img_fft2函数即可，该文件实现了傅里叶变换，且把高频和低频部分重新排列，输入图像，可得到响应的频谱图-The zip file contains two directly calls the img_fft2 function, this file implements the Fourier transform, and rearrange the high frequency and low frequency, input image can be obtained by response spectrum