How can i illustrate the fast fourier transform of an image ?

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Gn Gnk
Gn Gnk 2020-12-8
回答： Bjorn Gustavsson 2020-12-8
Hello ,
i perfrom Fast Fourier Transform on an image .This is my code:
I_fft=fftshift(fft2(I_new));
figure();
imagesc(abs(I_fft));
colormap(gray);
%imshow((I_fft));
I was asked to illustrate the result . The problem is that both imagesc and imshow doesn't give me any good result .
Any thoughts would be valuable.

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回答（1 个）

Bjorn Gustavsson
Bjorn Gustavsson 2020-12-8
Typically you will have to take the log of the magnitude of the fft-coefficients to get a "nice-looking" illustration. That is due to the fact that the amplitudes typically decreases very rapidly. You should also consider displaying the phase of the fourier-coefficients. For that use:
imagesc(angle(I_fft))
For that type of cyclical data the hsv colormap is better than the standard parula or jet.
HTH

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