[Insight-users] WatershedSegmentTree...

[Miller, James V (Research)]

The WatershedSegmentTree is used internally by the WatershedFilter.  It is a tree (as opposed to a forest) because
at the highest flood level, there should be a single segment.  As the flood level is decreased, more and more 
of the tree is used. The leaves of the tree are the local minima (or plateaus).

You could also change the amount of preprocessing (smoothing) that is done prior to the watershed calculation.  That
can impact the number of segments.

Jim



-----Original Message-----
From: insight-users-bounces+millerjv=crd.ge.com at itk.org
[mailto:insight-users-bounces+millerjv=crd.ge.com at itk.org]On Behalf Of C
Heinzl
Sent: Friday, August 05, 2005 2:12 AM
To: insight-users at itk.org
Subject: [Insight-users] WatershedSegmentTree...


Hi,

I need to get a binary image of a watershed segmentation image. Basically I do the watershed the way shown in the examples. In the watershed segmented image there are about 10 major areas and lot of small minor areas. Tuning the parameters flooding level and threshold does not change too much to the resulting colored image regarding less and especially bigger areas. So I think the best thing would be some kind of hirarchical comparison. I found out that there is already a WatershedSegmentTree in ITK. Does itk create one tree or one graph of the segmented image? I think that there should be a"forrest" of trees, one for each local minimum. My question is: how can I combine the areas in my segmented image with the WatershedSegmentTree representation?

THX, 
Christoph



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