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RE: loglog plot and fft2
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From: |
William Krekeler |
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Subject: |
RE: loglog plot and fft2 |
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Date: |
Tue, 8 Mar 2011 16:02:27 +0000 |
Paolo,
Many of the octave and Matlab help files overlap (though not always). Take a
look at http://www.mathworks.com/help/techdoc/ref/fft.html
The link explains how the fft works and how to plot in frequency space by
creating a f-space vector. Hope that helps.
Bill
-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Paolo Zaffino
Sent: Monday, March 07, 2011 12:49 PM
To: address@hidden
Subject: loglog plot and fft2
Hi at all!
I must compute the power spectrum density of an image.
For this reason I run:
psd=sqrt(abs(fft2(img)));
and it seems ok.
Now I'd like plot into a loglog graph the spectrum of the 2D Fouriere
trasform (frequency vs magnitude)...Could anyone help me?
Thanks a lot!
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