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Re: Image warping in IDL [message #51405 is a reply to message #51319]

Mon, 20 November 2006 12:17

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Tue, 14 Nov 2006 11:20:38 +0100, Wox wrote:

> On Fri, 10 Nov 2006 15:51:34 -0700, JD Smith <jdsmith@as.arizona.edu>
> wrote:
>
> <snip>
>
>> If you code this up, let us know whether it was faster.
>
> Wow, thanks! A nice opportunity to brush up my histogram skills :-).
>
> I'm almost there and I will post some benchmarks when finished.
>
> One question though: "Don't you need a second loop (a loop over the
> repeat counts in H4)?"

Yes, as I see you figured out. Nice implementation. As you found,
explicitly loop from 1 to omax in your histogram of repeat counts is
fine, and solves the problem without any monkeying of indices. In
fact, the snippet j=1,omax4-omin4 works only when omin4 is zero (which
it seems to be always for you). j=1,omax should work. If you want to
handle the j=1 case seperately for efficiency (as you've done), just do so
and start the loop at 2. Also, I couldn't quite understand the
rebin([3,2,3,2],4,npix) for selecting which 4 of the 9 output pixels
actually receive any data. It seems like those are fixed offsets, which
wouldn't work when the offset direction rotates around. Maybe something
about your mapping lets you get away with that.

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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