[ITK] [ITK-users] ShapeLabelMap Roundness/Perimeter Calculation Issue

[ebasafa]

Thank you for the pointer! After fiddling with the hxx file for a couple
hours, I traced the issue further and found out the method vnl_math_abs()
called on line 537 (which seems like in the repository has been replaced by
itk::Math::abs() but not implemented in the stable release), provides
different answers for absolute values in debug and release. Surprisingly,
for example, this method reports -1 as absolute value of -1 in release!
Replacing that with std::abs() resolves the issue and now roundness and
perimeter are the same and (seemingly) correct. I think a bug fix, if not
already done via itk::Math as I mentioned, is in order.




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