[Insight-users] Watershed Filter (flat regions)

[Langkammer, Christian (SCR US EXT)]

Hello,

I am using the WatershedFilterType to segment CT images. 
When big flat regions with the same pixel values (e.g. masked out
organs) are used as input a division through zero occurs in
itk_hashtable.h:640.
Does someone know details about that and could it be due to the problems
addressed in [1]?

Adding some noise to this regions solves the problem but it will not
affect the performance positive... 

Is there a calculable upper limit for the size of connected input
regions with the same intensity? 

Thanks and best regards,
Christian


[1]
http://insight-journal.org/dspace/bitstream/1926/202/2/The_watershed_tra
nsform_in_ITK_-_discussion_and_new_developments.pdf