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When and why do we need to perform Fourier transform before calculating the phase of the image?

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    $\begingroup$ Can you define "phase of an image"? $\endgroup$ – MBaz Sep 15 '17 at 1:03
  • $\begingroup$ @MBaz i have edited the question. $\endgroup$ – Shdotcom Sep 15 '17 at 4:53
  • $\begingroup$ The phase is derived by the Fourier Transform. Can you please clarify the question? $\endgroup$ – A_A Sep 15 '17 at 8:04
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The discrete Fourier transform (DFT) does by definition transform your image into the frequency domain, mapping it to a matrix of complex numbers.

Again, by definition, a complex number has a phase and a magnitude component.

Thus, you don't "need to perform FT before calculating the phase of an image", you get the phase of the image as a result of the FT.

It's a bit like saying "why do I need to perform an addition before calculating the sum of 2 number?".

I would suggest you to learn more about Fourier Transform

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  • $\begingroup$ could you please check this link , they performed FT before calculating the phase. $\endgroup$ – Shdotcom Sep 15 '17 at 8:49

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