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Re: Image analysis and ring identification [message #30275 is a reply to message #30272]

Thu, 18 April 2002 06:05

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Rachel Pepper (Rachel_Pepper@brown.edu) writes:

> Actually, the rings often have a bright spot that is not in the center of
> the ring, so I don't think the centroiding technique will work. Do you have
> any other suggestions?

I think Paul's suggestions are right on the money,
but I wouldn't give up on the centroid theory too
quickly. The wonderful thing about centroids is that
they are really center of mass calculations. So if
the values you total are actual image values,
then the centroid will naturally zero in on
bright spots, since they are "heavier" in the
calculations.

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155

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[Message index]

		Re: Image analysis and ring identification By: James Kuyper on Thu, 18 April 2002 08:07
		Re: Image analysis and ring identification By: Paul Van Delst[1] on Thu, 18 April 2002 06:44
		Re: Image analysis and ring identification By: David Fanning on Thu, 18 April 2002 06:05
		Re: Image analysis and ring identification By: Paul Van Delst[1] on Thu, 18 April 2002 05:37
		Re: Image analysis and ring identification By: Rachel Pepper on Wed, 17 April 2002 21:21
		Re: Image analysis and ring identification By: David Fanning on Wed, 17 April 2002 07:29
		Re: Image analysis and ring identification By: Dan Larson on Thu, 18 April 2002 08:37
		Re: Image analysis and ring identification By: David Fanning on Thu, 18 April 2002 08:33

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