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Re: Edge detection for saturn's rings [message #61406 is a reply to message #61345]

Tue, 15 July 2008 20:02

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

frankosuna writes:

> I've been trying to use some of the built in edge detection routines
> implemented in idl such as sobel but I haven't found a very good one
> that will work for images such as this:
>
> http://frankosuna.googlepages.com/supportImage.jpg
>
> I am trying to pull out all of the rings in this image and the best I
> have gotten is this:
>
> http://frankosuna.googlepages.com/edgeDetect.jpg
>
> Any suggestions and opinions are welcome.

Andrew Cool points out to me that as a backyard astronomer, he
is always interested in this kind of thing, and that the CANNY
edge detection routine is often the best one for this kind of
separation. Oddly, though, there is no mention of the CANNY
routine under "Edge Detection" in either the IDL 6.4 or IDL 7.x
on-line help! An oversite we hope someone at ITTVIS notices.

Cheers,

David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Edge detection for saturn's rings By: frankosuna on Mon, 14 July 2008 17:43
		Re: Edge detection for saturn's rings By: frankosuna on Wed, 16 July 2008 09:10
		Re: Edge detection for saturn's rings By: David Fanning on Wed, 16 July 2008 07:06
		Re: Edge detection for saturn's rings By: Vince Hradil on Wed, 16 July 2008 07:02
		Re: Edge detection for saturn's rings By: David Fanning on Tue, 15 July 2008 20:02

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