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Re: FFT OF A NON RECTANGULAR IMAGE [message #63075 is a reply to message #63071]

Tue, 28 October 2008 13:15

pgrigis
Messages: 436
Registered: September 2007

Senior Member

Maybe you could do a (slow) FT instead of FFT?

Ciao,

Paolo

legall_al...@yahoo.fr wrote:
> Hi all:
>
> How can we do a FFT on a 2D-function that defines a non-rectangular
> image?
>
> Here is an example: the region of interest is an inclined ellipse. To
> be able to apply FFT(array,1), I created an array where all the pixels
> around the ellipse are set to the value zero. I would like to exclude
> from the FFT process the black area (zero value pixels) surrounding
> the ellipse.
>
>
> Thank you a lot in advance for your help,
>
> Alice Le Gall

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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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