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Re: x-y offsets [message #70956 is a reply to message #70955]

Wed, 19 May 2010 12:45

Gray
Messages: 253
Registered: February 2010

Senior Member

On May 19, 2:50 am, Jeremy Bailin <astroco...@gmail.com> wrote:
> On May 18, 8:29 pm, Gray <grayliketheco...@gmail.com> wrote:
>
>
>
>
>
>> Hi all,
>
>> This is a variation on the 2D matching problem that I'm having trouble
>> algorithm-ing (to coin an incredibly awkward word).
>
>> I have two sets of XY coordinates of unequal length (i.e., x1/y1/n1,
>> x2/y2/n2, n1 ne n2). I want to find offsets in both X and Y that
>> match the two sets as closely as possible (there will obviously be
>> some unmatched coordinates in the larger set). I'm just looking for
>> constant offsets, so basically (for n1 < n2) x1 + Cx -> x2, y1 + Cy ->
>> y2, with some elements of x2 and y2 being unmatched. How do I go
>> about doing this? I don't think I can use JD's MATCH_2D because I
>> don't know a priori what my matching radius is.
>
>> Any suggestions? Thanks, as always!
>
>> --Gray
>
> I would be tempted to create a 2D histogram based on each set and then
> cross-correlate them.
>
> -Jeremy.

How do you turn the cross-correlation into offsets? And, how do you
intelligently choose a binsize for the histogram?

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[Message index]

		Re: x-y offsets By: Jeremy Bailin on Thu, 20 May 2010 13:11
		Re: x-y offsets By: Jeremy Bailin on Thu, 20 May 2010 12:20
		Re: x-y offsets By: Gray on Thu, 20 May 2010 08:01
		Re: x-y offsets By: Jeremy Bailin on Wed, 19 May 2010 21:59
		Re: x-y offsets By: Jeremy Bailin on Wed, 19 May 2010 19:56
		Re: x-y offsets By: Craig Markwardt on Wed, 19 May 2010 18:45
		Re: x-y offsets By: Jeremy Bailin on Wed, 19 May 2010 18:38
		Re: x-y offsets By: Gray on Wed, 19 May 2010 12:45
		Re: x-y offsets By: Jeremy Bailin on Tue, 18 May 2010 23:50
		Re: x-y offsets By: Gray on Tue, 18 May 2010 14:08

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