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Re: Image analysis and ring identification [message #30352 is a reply to message #30311]

Thu, 18 April 2002 11:47

Rachel Pepper
Messages: 3
Registered: April 2002

Junior Member

Sorry to be so confusing! I want the center of the circle (ie the bright ring)
and the bright spots are messing up the centroid-based method (James is right).

Rachel

David Fanning wrote:

> James Kuyper (kuyper@gscmail.gsfc.nasa.gov) writes:
>
>> Yes, but I didn't get the impression that he wants to find the bright
>> spot. He asked how to determine the center of the circle, and complained
>> about the fact that the bright spot would mess up the centroid-based
>> method of calculating the center, because the bright spot was off-center.
>
> Isn't language odd? I thought she asked how to find the
> center of the ring, but then realized she wasn't interested
> in the center, but in the bright spot, which wasn't necessarily
> in the center. I think she might be able to have her cake
> and eat it too, depending upon the values she uses to
> calculate the centroid. In fact, she might even learn
> something fascinating about her rings by measuringg how
> the centroid changes between the two different calculations.
>
> But, hang on a minute! We don't have to be Aristotle and
> his friends arguing endlessly about how many teeth a
> horse has, we can ask the source. Rachel, what in the
> world are you asking about?
>
> 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]

		Image analysis and ring identification By: Rachel Pepper on Wed, 17 April 2002 06:55
		Re: Image analysis and ring identification By: Karsten Rodenacker on Fri, 19 April 2002 00:14
		Re: Image analysis and ring identification By: Rachel Pepper on Thu, 18 April 2002 11:47
		Re: Image analysis and ring identification By: Jonathan Joseph on Mon, 22 April 2002 11:56

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