How to implement sign operator using matlab

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praveen kumar
praveen kumar 2020-11-2
评论： Walter Roberson 2020-11-10
I was trying to implement a filter for digital image processing which require sign operator ie.
Can some tell me how to calulate it.
where ,X[u,v] is fast fourier transform of image.

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回答（1 个）

Mathieu NOE
Mathieu NOE 2020-11-10
hello
your code request the sign of the phase of fft2 output
example below - nothing fancy :
img = imread('Noe_300dpi_3.jpg');
imagesc(img)
img = fftshift(img(:,:,2));
F = fft2(img);
figure;
imagesc(100*log(1+abs(fftshift(F)))); colormap(gray);
title('magnitude spectrum');
figure;
imagesc(angle(F)); colormap(gray);
title('phase spectrum');
figure;
imagesc(sign(angle(F))); colormap(gray);
title('phase spectrum sign');
you 'll notice the sharper output when you use sign(phase) instead of phase only
  1 个评论
Walter Roberson
Walter Roberson 2020-11-10
Is the phase of the fourier transform? The user indicated that is the fourier transform but did not define

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