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Re: Chain-Link Algorithm for Perimeter [message #30327 is a reply to message #30322]

Fri, 19 April 2002 13:41

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

dmarshall@ivory.trentu.ca (dmarshall@ivory.trentu.ca) writes:

> If you know the pixel co-ords and your blob has no "serious" cavities (ie,
> openings that cause the perimeter to fold back on itself) you can convert
> your cartesian co-ords to polar (centered about the blob center), sort on
> the angle and convert back.

Alas, those damn blobs are *full* of "serious" cavities,
which is exactly what is causing my current algorithm
to go cross-eyed. :-(

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: Chain-Link Algorithm for Perimeter By: Ted Cary on Sat, 20 April 2002 17:01
		Re: Chain-Link Algorithm for Perimeter By: David Fanning on Fri, 19 April 2002 13:41
		Re: Chain-Link Algorithm for Perimeter By: dmarshall on Fri, 19 April 2002 13:22
		Re: Chain-Link Algorithm for Perimeter By: gutmann on Fri, 26 April 2002 13:58

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