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Re: checking for connectedness of a given set of pixels [message #73332 is a reply to message #73312]

Tue, 02 November 2010 15:14

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Guillermo writes:

> Libreme Dios! Both functions are great, but I just need to know
> whether or not the pixels are connected. That is, as soon as I find
> one of the little guys who doesn't go hand in hand with the rest,
> that's good enough for me. So I thought there should be a way of
> getting this info without having to call the big shots ...

Bueno! You might try some variation of the chain-code algorithm
then. If you get to the end of a chain and there are no roads
leading anywhere but back the way you came, you are probably
at the end of the road.

This is not the easiest of algorithms to code, but you
can find one version (written for my purposes) in
find_boundary.pro. I think I found the algorithm in the
Russ image processing book.

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]

		Re: checking for connectedness of a given set of pixels By: David Fanning on Wed, 03 November 2010 06:35
		Re: checking for connectedness of a given set of pixels By: guillermo.castilla.ca on Wed, 03 November 2010 06:32
		Re: checking for connectedness of a given set of pixels By: David Fanning on Tue, 02 November 2010 15:14
		Re: checking for connectedness of a given set of pixels By: guillermo.castilla.ca on Tue, 02 November 2010 15:06
		Re: checking for connectedness of a given set of pixels By: David Fanning on Tue, 02 November 2010 13:37
		Re: checking for connectedness of a given set of pixels By: James[2] on Mon, 08 November 2010 11:22
		Re: checking for connectedness of a given set of pixels By: guillermo.castilla.ca on Sun, 14 November 2010 13:56
		Re: checking for connectedness of a given set of pixels By: guillermo.castilla.ca on Mon, 03 January 2011 13:50

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