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Re: Convolution, IDL & Numerical Recipes [message #32670 is a reply to message #32669]

Fri, 01 November 2002 06:09

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

Senior Member

David Fanning wrote:

> Gonzales and Woods seem to suggest that "convolution" is a
> frequency domain concept, and can only be loosely applied in
> the linear spatial sense. Could this be part of the problem?

All operations performed in the time domain have an analogous
operation in the frequency domain. For the fourier transform, as
with all orthogonal transformations. only change the basis functions
on to which your data is projected, and does not change the data.

Just note that freq domain techniques do circular convolution,
time domain does not necessarily.

Cheers,
bob stockwell

> I'm curious about this because I have been trying to
> duplicate some of the results in the book (they apparently
> use MatLab) and I am having rather more trouble than
> I had hoped to. :-(

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[Message index]

		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 06:48
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 06:09
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 06:01
		Re: Convolution, IDL & Numerical Recipes By: Kenneth P. Bowman on Thu, 31 October 2002 19:41
		Re: Convolution, IDL & Numerical Recipes By: James Kuyper on Thu, 31 October 2002 17:10
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Thu, 31 October 2002 14:29
		Re: Convolution, IDL & Numerical Recipes By: JD Smith on Thu, 31 October 2002 13:48
		Re: Convolution, IDL & Numerical Recipes By: aceves on Mon, 04 November 2002 18:55
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 06:53
		Re: Convolution, IDL & Numerical Recipes By: aceves on Fri, 01 November 2002 17:06

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