[Insight-users] How to use itk::SegmentationLevelSetImageFilter

[Lydia Ng]

Hi Yanjun,

>Does ITK have any filter supporting Multilabel  Fast Marching?=20

No, the fast marching filter currently only supports a single label.

- Lydia


-----Original Message-----
From: Xu, Yanjun [mailto:yanjunxu@umich.edu]
Sent: Friday, December 06, 2002 8:01 AM
To: insight-users@public.kitware.com
Subject: [Insight-users] How to use itk::SegmentationLevelSetImageFilter


Hi,
=20
I want to use SegmentationLevelSetImageFilter to do some brain MRI =
segmentation, but didn't make clear how to use it. I have the following =
questions about it.
=20
What kind of seed image does it need? Does it accept one label (class) =
or multiple label image? In SparseFieldLevelSetImageFilter<TInputImage, =
OutputImage>::ConstructActiveLayer(), it seems that only pixels with =
m_ValueZero  are put into ActiveLayer. Is this ActiveLayer considered =
propagation front? Does it mean that seed label must be zero? Can this =
seed label be point, contour, or area?=20
=20
Threshold SegmentationLevelSetImageFilter , a subclass of =
SegmentationLevelSetImageFilter,  need upperThreshold and =
lowerThreshold. What is the value range for these two thresholds? Are =
they the thresholds for original image or some derived feature image( =
Curvature, Gradient)?=20
=20
Does ITK have any filter supporting Multilabel  Fast Marching?=20
=20
Thanks a lot.
=20
Sincerely,
Yanjun
=20