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Re: Convolution, IDL & Numerical Recipes [message #32756 is a reply to message #32678]

Fri, 01 November 2002 12:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

R.G. Stockwell (sorry@noemail.now) writes:

>> Which would I use if I'm trying to make a pretty image? :-)
>
> I suggest running all possible permutations of the keywords, and
> selecting the one that matches the textbook examples :)

Well, I can assure you that if you want to sharpen an image,
that setting the CENTER keyword correctly is critical. :-)

Here are some images and the code I used to make them,
so you can see for yourselves. You definitely want a
convolution, not a correlation, which is just the opposite
of what MatLab wants, or.... Oh, hell, I'm confused again.
Where are those aspirin!?

http://www.dfanning.com/test/center_1.jpg
http://www.dfanning.com/test/center_1.jpg
http://www.dfanning.com/test/sharpen.pro

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Convolution, IDL & Numerical Recipes By: aceves on Thu, 31 October 2002 12:50
		Re: Convolution, IDL & Numerical Recipes By: aceves on Wed, 06 November 2002 17:02
		Re: Convolution, IDL & Numerical Recipes By: JD Smith on Tue, 05 November 2002 14:42
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Tue, 05 November 2002 05:34
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 12:14
		Re: Convolution, IDL & Numerical Recipes By: David Fanning on Fri, 01 November 2002 11:12
		Re: Convolution, IDL & Numerical Recipes By: muzic on Tue, 12 November 2002 06:10
		Re: Convolution, IDL & Numerical Recipes By: muzic on Tue, 12 November 2002 06:10
		Re: Convolution, IDL & Numerical Recipes By: R.G. Stockwell on Fri, 01 November 2002 10:44

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