comp.lang.idl-pvwave archive: archive » Re: FFT OF A NON RECTANGULAR IMAGE

Home » Public Forums » archive » Re: FFT OF A NON RECTANGULAR IMAGE

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

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

Report message to a moderator

[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

Previous Topic:	changing font type on a widget
Next Topic:	Multiple click region growing

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Nov 28 22:28:19 PST 2025

Total time taken to generate the page: 0.16140 seconds