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Re: Image warping in IDL [message #51289 is a reply to message #51172]

Thu, 09 November 2006 02:53

Wox
Messages: 184
Registered: August 2006

Senior Member

On Wed, 08 Nov 2006 10:07:40 -0700, JD Smith <jdsmith@as.arizona.edu>
wrote:
> I don't see how forward and reverse mapping in this context are any
> different from each other.

The approach is different. And yes, if you just had the tie points in
input and output image, you could choose between forward and reverse
mapping.

But as stated after the description of forward and reverse mapping: "I
only have the surfaces (Xi,Yi)->Xo and (Xi,Yi)->Yo". I have these
surfaces as 2D splines, I don't have the anchor points.

So I can't just "swap the anchor points", because I don't have them, I
only have the coefficients of two 2D splines.

The thing is, how to "swap these surfaces", if you know what I mean.

Off course, one could define some arbitrarly tie points, evaluate the
spline for them and then "swap the anchor points" to do reverse
mapping. But how to define these tiepoints?

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[Message index]

		Re: Image warping in IDL By: Robbie on Wed, 08 November 2006 21:49
		Re: Image warping in IDL By: JD Smith on Wed, 08 November 2006 09:07
		Re: Image warping in IDL By: Wox on Wed, 08 November 2006 06:50
		Re: Image warping in IDL By: David Fanning on Wed, 08 November 2006 06:01
		Re: Image warping in IDL By: Wox on Thu, 09 November 2006 02:53
		Re: Image warping in IDL By: Jeff Hester on Sat, 18 November 2006 15:22
		Re: Image warping in IDL By: Wox on Thu, 09 November 2006 04:37

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