I want to find the dominant frequency. I used fft in this way
yf3 = fftshift(fft2(intensity_profile));
and I got, again for example, this:
First, is it correct? I do not know hot to get the dominant frequency? For now I have plotted the intensity distribution along the circle points. How can I plot it against the frequency?
What I want finally is the main frequency and then wavelength of the profile.
Thanks so much.