InsightSoftwareConsortium / InsightSoftwareConsortium/ITK

itkMorphologicalDistanceTransformImageFilter instead of itkSignedMaurerDistanceMapImageFilter

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Description

Is there a particular reason to use itkSignedMaurerDistanceMapImageFilter
https://github.com/InsightSoftwareConsortium/ITKThickness3D/blob/2539b34e4b43fd9369a0ad961c4811f2f329c0e4/include/itkMedialThicknessImageFilter3D.h#L23
instead of e.g. [itkMorphologicalDistanceTransformImageFilter](https://itk.org/Doxygen/html/classitk_1_1MorphologicalDistanceTransformImageFilter.html) (which would be multi-threaded)?
Why signed DM? Are there cases where the skeleton reaches outside of the binary image?

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