[Insight-users] PointSet Segmentation

[Karthik Krishnan]

Kevin H. Hobbs wrote:

>Is there any way to segment PointSets or Blobs?  I looked through the
>software guide, and the Doxygen, and I didn't see anything.
>  
>
If your point set is sparse enough, you can use a clustering algorithm.

You can use Kmeans clustering from ITK.
Take a look at Examples/Statistics/KdTreeBasedKMeansClustering.cxx

Your sample in the example will be the list of points in the point set. 
You can define the number of clusters you want.
Since Euclidian distance metric is used, you will end up binning your 
sparse image into n clusters.

HTH
karthik

>I'm using a PointSet as a sort of sparse image to try to save some RAM
>on all those pesky background pixels.
>
>I'm trying to write some quick and dirty C to do a sort of
>ConnectedComponentPointSetFilter. Every time I try something like this,
>I get about half way through and become acutely aware that someone has
>to have done this before.
>
>Has anybody done this, or thought a lot about a it?
>  
>
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