# Fourier transform before calculating the phase [closed]

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

• Can you define "phase of an image"? – MBaz Sep 15 '17 at 1:03
• @MBaz i have edited the question. – Shdotcom Sep 15 '17 at 4:53
• The phase is derived by the Fourier Transform. Can you please clarify the question? – A_A Sep 15 '17 at 8:04