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Re: XROI - how to invoke region growing [message #29356 is a reply to message #29320]

Wed, 13 February 2002 06:05

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Dorthe Wildenschild (dw@er.dtu.dk) writes:

> Do you know what the difference is then between the old SEARCH3D (5.4)
> and the new REGION_GROW (in 5.5)?

Haven't you had the experience of spending a week writing
a great new routine, only to accidentally discover that
you had written (and forgotten) something very much like
it the year before? I don't know that this is the case here,
but it seems like it. REGION_GROW is definitely more robust
than SEARCH3D (n-dimensional arrays vs. 3D arrays, for example),
but they do very similar things. I'd like to think of them as two
approaches to the same problem. You should try them both and see which
you like better.

> Also, are any of you familiar with a
> 3-d equivalent of CONTOUR? I use CONTOUR to retrieve perimeter, area
> etc. for 2D objects (and thanks to this newsgroup and Dave Fanning I
> have learnt that it's necessary to smooth the object before! using
> CONTOUR to get decent results (error < 1%), but I don't think SURFACE
> will do the same in 3D, i.e., give me surface area for instance, of a
> 3D object?

I should think either ISOCONTOUR or ISOSURFACE is what you
are looking for.

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/
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[Message index]

		Re: XROI - how to invoke region growing By: Benno Puetz on Sat, 09 February 2002 12:19
		Re: XROI - how to invoke region growing By: Ted Cary on Sat, 09 February 2002 05:49
		Re: XROI - how to invoke region growing By: David Fanning on Fri, 08 February 2002 20:04
		Re: XROI - how to invoke region growing By: Ted Cary on Fri, 08 February 2002 16:25
		Re: XROI - how to invoke region growing By: David Fanning on Fri, 08 February 2002 16:06
		Re: XROI - how to invoke region growing By: Ted Cary on Fri, 08 February 2002 13:44
		Re: XROI - how to invoke region growing By: dw on Sun, 10 February 2002 02:37
		Re: XROI - how to invoke region growing By: David Fanning on Wed, 13 February 2002 06:05

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