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Re: Compute area between curves [message #62922 is a reply to message #62821]

Wed, 15 October 2008 20:42

Craig Markwardt
Messages: 1869
Registered: November 1996

Senior Member

frankosuna <frankosuna@gmail.com> writes:
>
> I need to come up with some measurement to see how close the edge
> detected ring from the image and the ring from the wireframe are. They
> are ellipses and they do cross since we're trying to get them as close
> as possible.

OK, it still sounds like the "best" way to do it is take your points
and re-sample them to the same grid, so they are directly comparable.
In principle you can re-sample in X, but I think it would be better to
convert the original points to R,PHI polar coordinates and sample to a
uniform PHI grid. At that stage, you can compute
TOTAL((R_MEAS - R_WIREFRAME)^2)
which is effectively a chi-square, which then also measures goodness
of your fit. [ I.e. forget about integrals. ]

Craig

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Craig B. Markwardt, Ph.D. EMAIL: cbmarkwardt+usenet@gmail.com
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[Message index]

		Compute area between curves By: frankosuna on Sun, 12 October 2008 13:16
		Re: Compute area between curves By: jameskuyper on Tue, 14 October 2008 04:26
		Re: Compute area between curves By: mystea on Tue, 14 October 2008 22:35
		Re: Compute area between curves By: mystea on Thu, 16 October 2008 08:50
		Re: Compute area between curves By: jameskuyper on Tue, 14 October 2008 03:16
		Re: Compute area between curves By: Craig Markwardt on Tue, 14 October 2008 09:59
		Re: Compute area between curves By: mystea on Mon, 13 October 2008 22:35
		Re: Compute area between curves By: Craig Markwardt on Mon, 13 October 2008 21:42
		Re: Compute area between curves By: jameskuyper on Mon, 13 October 2008 06:24
		Re: Compute area between curves By: Craig Markwardt on Mon, 13 October 2008 03:15
		Re: Compute area between curves By: frankosuna on Sun, 12 October 2008 18:31
		Re: Compute area between curves By: ben.bighair on Sun, 12 October 2008 15:59
		Re: Compute area between curves By: ben.bighair on Sun, 12 October 2008 15:59
		Re: Compute area between curves By: frankosuna on Sun, 12 October 2008 14:35
		Re: Compute area between curves By: jameskuyper on Sun, 12 October 2008 14:17
		Re: Compute area between curves By: frankosuna on Sun, 12 October 2008 14:14
		Re: Compute area between curves By: mankoff on Sun, 12 October 2008 13:57
		Re: Compute area between curves By: Jeremy Bailin on Thu, 16 October 2008 05:18
		Re: Compute area between curves By: Craig Markwardt on Wed, 15 October 2008 20:42
		Re: Compute area between curves By: pgrigis on Wed, 15 October 2008 13:56
		Re: Compute area between curves By: frankosuna on Wed, 15 October 2008 13:37
		Re: Compute area between curves By: jameskuyper on Wed, 15 October 2008 05:05
		Re: Compute area between curves By: jameskuyper on Wed, 15 October 2008 04:44
		Re: Compute area between curves By: Craig Markwardt on Wed, 15 October 2008 04:21
		Re: Compute area between curves By: jameskuyper on Tue, 14 October 2008 10:21
		Re: Compute area between curves By: jameskuyper on Fri, 17 October 2008 12:43
		Re: Compute area between curves By: pgrigis on Thu, 16 October 2008 09:30

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