假设我是您的输入图像并且 F 是它的傅立叶变换（即 F = fft2（I））

Assuming that I is your input image and F is its Fourier Transform (i.e. F = fft2(I))

你可以使用此代码：

F = fftshift(F); % Center FFT

F = abs(F); % Get the magnitude
F = log(F+1); % Use log, for perceptual scaling, and +1 since log(0) is undefined
F = mat2gray(F); % Use mat2gray to scale the image between 0 and 1

imshow(F,[]); % Display the result