[Insight-users] ThresholdSegmentationLevelSet

[Joshua Cates]

Hi,

Just a couple of tips using this filter:  Your initialization should be a
closed surface such as a sphere or a box.  A single point or line will
disintigrate under its own curvature after only a few iterations.  The key
to getting good results is obviously to find the correct threshold
parameters, which will be a trial and error process for your dataset.

As Luis has alluded to, I have developed an example which works with VTK 
visualization (it is a module in SegmentationEditor).  I will probably 
check this example into the CVS repository some time next month.

Josh.


______________________________
 Josh Cates			
 School of Computer Science	
 University of Utah
 Email: cates@sci.utah.edu
 Phone: (801) 587-7697
 URL:   www.cs.utk.edu/~cates


On Thu, 26 Sep 2002, Luis Ibanez wrote:

> 
> Hi Zein,
> 
> The ThresholdSegmentationLevelSet example illustrates
> how to use the ThresholdSegmentationLevelSetImageFilter.
> http://public.kitware.com/Insight/Doxygen/html/classitk_1_1ThresholdSegmentationLevelSetFunction.html
> 
> This is a recently writen example, so it may still have
> some tweaks on it.
> 
> This filter evolves a level set starting from a
> binary mask (it is in some way the equivalent of a
> deformable contour driven by the evolution of an
> implicit function.
> 
> 
> Here is a short description of how to use it:
> 
> 1) Load a 3D Image by clicking on the "Load" button.
>     (e.g. any of the BrainWeb images on the ftp
>     site  ftp://public.kitware.com/pub/itk/Data/BrainWeb)
> 
> 2) Create seeds for the binary mask:
>     Display the image by clicking on the "Input Image" button.
>     Once the image is displayed you can select slices and create
>     seed points by clicking with the left mouse button on the
>     image. Red points will be displayed on the selected points.
> 
> 
> 3) Run the filter by clicking on "Threshold Segmentation"
>     (it will take about 10 seconds to run in one of the BrainWeb
>     images)
> 
> 4) When the filter is done, the "Display" button will turn
>     green and you can click on it to display the result.
>     The result of the evolved level set is displayed slice by
>     slice in a viewer.
> 
> 5) Visualization with VTK is under development on this
>     example...
> 
> 
> Please let us know if you have further questions,
> 
>    Thanks
> 
> 
>     Luis
> 
> 
> ==============================================================
> 
> Zein Salah wrote:
> 
> > Hello all,
> > 
> >  
> > 
> > What does this new example ThresholdSegmentationLevelSet  do? I did not 
> > find any documentation about it!
> > 
> >  
> > 
> > Thanks,
> > 
> > Zein
> > 
> >  
> > 
> >  
> > 
> > ->8<------------->8<------------->8<------------->8<------------->8<------------->8<-
> > Zein I. Salah
> > Universität Tübingen, WSI-GRIS
> > Sand 14
> > 72076 Tübingen
> > Email: salah@gris.uni-tuebingen.de <mailto:salah@gris.uni-tuebingen.de>  
> > / zeinsalah@hotmail.com <mailto:zeinsalah@hotmail.com>
> > Tel.: (07071) 29 75465 (GRIS) , (07071) 96 44 39 (privat)
> > 
> 
> 
> 
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