Hi there
Thanks to those people who replied to my phase wrapping problem, I think I
understand the situation better now. I have (possibly obvious) question with
regards to Fraunhofer diffraction, please help!
Basically I'm confused as to the difference between a point spread function
(obtained using an FFT) and the images that you see on photographic film in
standard optics textbooks, e.g. for the Fraunhofer pattern of a square aperture
(i.e. Hecht, pg. 466). To get the Fraunhofer you bascially take the Fourier
transform, yet it is only when you plot it over a log scale that the image
becomes like those seen on photographic film. (Sorry I know this is more of an
optics question that a matlab question). A friend of mine suggested that because
the FT performs an exponential, to get a linear image as you would see in
reality you must therefore take the natural logarithm. Is this correct? I'd
appreciate any advice here.
Cheers,
Alex
