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Re: FFT OF A NON RECTANGULAR IMAGE [message #63071]

Tue, 28 October 2008 14:07

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

<pgrigis@gmail.com> wrote in message
news:3cb784b7-dfed-4c87-a2ab-d775d1edec0e@f40g2000pri.google groups.com...
> Maybe you could do a (slow) FT instead of FFT?
>
> Ciao,
>
> Paolo

Not directly. DFT and FFT are the same, the difference is in how the
calculation is done.

One could simply do a series of one dimensional FFTs on the data (each of
differing length,
and just combine them into a couple of image. i.e. just look at an image of
kx spectra,
then a different image of ky spectra.

Also, one can write the 2D FT as a series of 1D ffts, and perhaps that
approach
would get what the OP wants (if that is what you are talking about).

Cheers,
bob

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[Message index]

		Re: FFT OF A NON RECTANGULAR IMAGE By: R.G. Stockwell on Tue, 28 October 2008 14:07
		Re: FFT OF A NON RECTANGULAR IMAGE By: pgrigis on Tue, 28 October 2008 13:15
		Re: FFT OF A NON RECTANGULAR IMAGE By: R.G. Stockwell on Tue, 28 October 2008 11:58
		Re: FFT OF A NON RECTANGULAR IMAGE By: pgrigis on Tue, 28 October 2008 14:21

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