| Fourier transform, [message #29028] |
Wed, 30 January 2002 03:41  |
dinhnq
Messages: 14
Registered: December 2001
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Junior Member |
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Dear all,
I have an array (200,200,12). The variable change during 12 months. I
want to smooth this variable by creating new array with the same
dimentions that contain the results from Fourier transform.
FTT function return fourier coefficients for each pixel but not all.
Any helps would be very appreciate,
Dinh Huong
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| Re: fourier transform [message #45079 is a reply to message #29028] |
Mon, 01 August 2005 14:12  |
mperrin+news
Messages: 81
Registered: May 2001
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Member |
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Pravs <praveshsubramanian@yahoo.com> wrote:
> Hi ,
>
> I am trying to convolute a huge gaussian kernel ([192,192]) with an
> image array ([512,512]). of course, if i had all the time on earth, i
> could use the convol routine.
> can someone tell me how do i get it done faster by using fourier
> transform?
> more specifically,
>
> smoothimage = raw convol image
>
> = something in terms of fourier transform
The easiest way may be to use the CONVOLVE routine from the
Goddard IDL astronomy library. You can download it from
http://idlastro.gsfc.nasa.gov.
- Marshall
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