[Insight-users] Adaptive Threshold Segmentation

[Lassi Paavolainen]

Hi Edward,

I haven't seen any adaptive threshold method in ITK.

On Thu, 17 Sep 2009, Somer, Edward wrote:

> I'd write a class that inherited ConnectedThresholdImageFilter and add an 
> observer to update the lower threshold at each iteration as a set percentage 
> of the region mean. The filter would be initialised with a seed point and 
> iterate until the region grew no further.

This sounds correct if you are planning to do adaptive region growing 
segmentation. We have done adaptive threshold in BioImageXD project just 
by using mean or median filter and then comparing this result image to the 
original one. I guess this sort of adaptive thresholding is not what you 
are looking for, but you specifically want to do it in region growing way?

Anyway the code is available at:
http://bioimagexd.svn.sourceforge.net/viewvc/bioimagexd/bioimagexd/trunk/itkBXD/Algorithms/itkDynamicThreshold3DImageFilter.txx?revision=1473
http://bioimagexd.svn.sourceforge.net/viewvc/bioimagexd/bioimagexd/trunk/itkBXD/Algorithms/itkDynamicThreshold3DImageFilter.h?revision=1473

for anyone who is interested.

Lassi

-- 
Lassi Paavolainen, M.Sc.
Software Engineer
BioImageXD (http://www.bioimagexd.net)
lassi.paavolainen at jyu.fi