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Re: Cluster analysis [message #11189 is a reply to message #11153]

Mon, 09 March 1998 00:00

David Foster
Messages: 341
Registered: January 1996

Senior Member

Alex Schuster wrote:
>
> John Dickson wrote:
>
>> I have a 3D image array containing a series of clusters of pixels
>> of value 1, in a sea of value zero pixels.
>>
>> Has anyone an idea on how to produce an algorithm to count the
>> number of pixels in each of these clusters?
>
> Are the clusters connected? If not, I would look at the SEARCH3D
> routine.
>
> If you need more than that, maybe the routines NN_LEARN and NN_CLUST
> could help, this is an implementations of the k-means cluster analysis.
> I don't recall where I got them from, they were a bit hard to find, so
> if anyone is interested, just ask me and I mail them.
>
> Alex

If you haven't found what you need, email me and I will dig up a
C routine that does exactly what you need. It orders the clusters
in decreasing size, and assumes that they are NOT connected. It is
much faster than search3d.pro .

Dave

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~
David S. Foster Univ. of California, San Diego
Programmer/Analyst Brain Image Analysis Laboratory
foster@bial1.ucsd.edu Department of Psychiatry
(619) 622-5892 8950 Via La Jolla Drive, Suite 2240
La Jolla, CA 92037
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~

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[Message index]

		Cluster analysis By: mph410 on Fri, 27 February 1998 00:00
		Re: Cluster analysis By: David Foster on Mon, 09 March 1998 00:00
		Re: Cluster analysis By: Chris[2] on Tue, 07 December 2004 11:32
		Re: Cluster analysis By: Harald Frey on Mon, 06 December 2004 14:21
		Re: Cluster analysis By: George N. White III on Sun, 05 December 2004 06:43
		Re: Cluster analysis By: Chris.Jacobsen on Fri, 03 December 2004 15:30
		Re: Cluster analysis By: James Kuyper on Fri, 03 December 2004 06:44

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