img=imread('D:\qwe\123.jpg');subplot(2,3,1),imshow(img);title('原图像');f=rgb2gray(img);subplot(2,3,2),imshow(f);title('傅里叶变换图像');F=fft2(f);FS=fftshift(F);f=fft2(img); f=fftshift(f); r=real(f); i=imag(f); margin=log(abs(f)); phase=angle(f)*180/pi;