Image processing-a problem?

2013 3 12
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更新时间：2021 8 20
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Hey everyone,
I was just wondering why when the magnitude of an image is zero, the phase is so noisy?

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Youssef Khmou
Youssef Khmou 2013-3-12
hi Tina,
that is general question, can you be more specific, you mean when computing 2D Fourier transform of clean or noisy signal ?
Tina
Tina 2013-3-12
Yes, I am using imagesc(angle(mydata)) and mydata is a fft transform of my data.
Youssef Khmou
Youssef Khmou 2013-3-12
ok, but phase has meaning when talking about periodic signals (1d or 2d) an image can not be considered as periodic signal, so of course the phase will look like rv , do you obtain something like :
I=im2double(imread('circuit.tif'));
dI=fft2(I);
P=angle(dI);
imagesc(P)
?

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Tina
Tina
2013-3-12

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