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

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

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

FFT OF A NON RECTANGULAR IMAGE [message #63086]

Tue, 28 October 2008 09:23

legall_alice
Messages: 2
Registered: October 2008

Junior Member

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

Report message to a moderator

[Message index]

		FFT OF A NON RECTANGULAR IMAGE By: legall_alice on Tue, 28 October 2008 09:23
		Re: FFT OF A NON RECTANGULAR IMAGE By: legall_alice on Tue, 28 October 2008 20:56
		Re: FFT OF A NON RECTANGULAR IMAGE By: R.G. Stockwell on Tue, 28 October 2008 18:35
		Re: FFT OF A NON RECTANGULAR IMAGE By: pgrigis on Thu, 30 October 2008 08:10
		Re: FFT OF A NON RECTANGULAR IMAGE By: Kenneth P. Bowman on Tue, 28 October 2008 11:12

Previous Topic:	New Widgets Needed
Next Topic:	Re: position plot in iplot

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Nov 28 18:46:37 PST 2025

Total time taken to generate the page: 0.56410 seconds