comp.lang.idl-pvwave archive: archive » Re: Chain-Link Algorithm for Perimeter

Home » Public Forums » archive » Re: Chain-Link Algorithm for Perimeter

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Chain-Link Algorithm for Perimeter [message #30328 is a reply to message #30327]

Fri, 19 April 2002 13:22

dmarshall
Messages: 23
Registered: December 1997

Junior Member

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.

But then I guess, if you could assume the constraints of this method, you
wouldn't be asking about a Chain-Link method.....

....never mind.

Dave

In article <MPG.172a01b613e13adb98989e@news.frii.com>, David Fanning <david@dfanning.com> writes:
> Folks,
>
> I have a blob (naturally) and I want to know the
> pixels, in order, that describe the perimeter of
> the blob. The output of the Contour command, etc.
> is inappropriate, in this case.
>
> I think what I want to use is the Chain-Link Coding
> algorithm of R.L.T. Cederberg as described in The
> Image Processing Handbook by John Russ. Has anyone
> coded this up in IDL by any chance?
>
> I've been known to pay for code that saves me a ton
> of time. :-)
>
> 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

Report message to a moderator

[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

Previous Topic:	Re: environment variables on windows
Next Topic:	Need your help on changing visual class from Directcolor to True

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sun Nov 30 06:25:30 PST 2025

Total time taken to generate the page: 2.16399 seconds