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Re: Image warping in IDL [message #51539 is a reply to message #51400]

Tue, 21 November 2006 09:10

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Tue, 21 Nov 2006 10:18:02 +0100, Wox wrote:

> This is because I added a "boarder" of two pixels to the output image.
>
> interimg=MAKE_ARRAY(imgs[1]+4,imgs[2]+4,type=size(*img,/type ))
>
> I did this for the pixels that "fall-off". I just have to use < and >
> as in:
>
> off_x=0>(rebin(outpix[0,*],4,npix)+off_x)<(imgsinter[1]-1)
> off_y=0>(rebin(outpix[1,*],4,npix)+off_y)<(imgsinter[2]-1)
>
> After that, I cut off the 2 pixel boarder that accumulated all
> fall-off pixels. I thought this was the most efficient way. Otherwise
> I had to use if statements or something.

Interesting method. What I was specificially referring to is that you
have no "sign" term for dx or dy, so I'm not sure how you know which
quadrant relative to the target pixel your 4 output pixels occupy (UL,
UR, LL, LR). It seems you're always hitting a single quadrant. For the
final fsum eq 0. test for empty pix, a simple where(fsum eq 0.) should
suffice.

JD

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[Message index]

		Image warping in IDL By: Wox on Wed, 08 November 2006 04:53
		Re: Image warping in IDL By: David Fanning on Fri, 10 November 2006 15:11
		Re: Image warping in IDL By: JD Smith on Fri, 10 November 2006 14:51
		Re: Image warping in IDL By: Wox on Tue, 14 November 2006 02:20
		Re: Image warping in IDL By: JD Smith on Mon, 20 November 2006 12:17
		Re: Image warping in IDL By: James Kuyper on Fri, 10 November 2006 08:38
		Re: Image warping in IDL By: Wox on Fri, 10 November 2006 01:12
		Re: Image warping in IDL By: Wox on Fri, 10 November 2006 01:05
		Re: Image warping in IDL By: JD Smith on Thu, 09 November 2006 11:50
		Re: Image warping in IDL By: Wox on Wed, 15 November 2006 04:18
		Re: Image warping in IDL By: Wox on Tue, 14 November 2006 08:20
		Re: Image warping in IDL By: Wox on Tue, 21 November 2006 01:18
		Re: Image warping in IDL By: JD Smith on Tue, 21 November 2006 09:10
		Re: Image warping in IDL By: Jeff Hester on Mon, 20 November 2006 09:00
		Re: Image warping in IDL By: Wox on Mon, 20 November 2006 01:18
		Re: Image warping in IDL By: JD Smith on Wed, 22 November 2006 08:22
		Re: Image warping in IDL By: Wox on Wed, 22 November 2006 00:21

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