[Insight-users] Question about watershed filter

[Feng Ma]

Hi,

  I have been using watershed filter in ITK. It works great.

  I have a few questions about the label hierarchy with different values of 
parameter level:

  1. Is there a way to exact the hierarchy table at different levels? i.e., 
a method to answer the following sample question: a voxel has region label 
23 at level 0.2. What's its label value at level 0.4?

  2. From the manual, we can manipulate the level value below initial value 
to get segmentation without triggering the full watershed pipeline. Is there 
a limitation on step value how I change the level? For example, if I have 
initial level value set as 0.4. I could go to level 0.3 without triggering 
the full watershed pipeline. Could I go to 0.25 or even 0.245 and still have 
different segmentation table?
In other words, is there an internal step value of parameter level to 
control the building of segmentation hierachy table? Could we set this value 
to control the resolution of segmentation hierachy table?

  Thanks a lot.

-Feng

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