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Re: CONVOL with 2D array and 1D kernel [message #52971]

Fri, 09 March 2007 09:52

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Eric Hudson writes:

> This level of detail was why I was hoping for reference to some
> readable source. In any case, whether centered or not, the behavior
> of instantly setting all values in one row to zero once a 'magic'
> number of columns is reached is the problem I'd really like to
> understand. It seems like a bug but if this is expected behavior then
> I'd like to know because it means I really don't understand what the
> function is doing.

Well, when I want to understand something like "convolution"
(and I very seldom ever do!), I always pull out my trusty
copy of Gonzales and Woods' Digital Image Processing. It's
the only book on these topics I've ever been able to understand. :-)

> It was my understanding that this is what /edge_truncate does -- just
> duplicates the edge values once you get to the edge. I do not expand
> the array myself.

I think you are right. I was just fishing around for a
possible source of this weirdness. But, unfortunately,
I have no more ideas. :-(

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: CONVOL with 2D array and 1D kernel By: David Fanning on Fri, 09 March 2007 09:52
		Re: CONVOL with 2D array and 1D kernel By: Eric Hudson on Fri, 09 March 2007 09:38
		Re: CONVOL with 2D array and 1D kernel By: David Fanning on Fri, 09 March 2007 06:42

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