thresholding a mask

[blowekamp (Bradley Lowekamp)]

There are not a shortage of ways to do this in ITK.

A new option with ITKv5 is to use the BinaryGeneratorImageFilter to us a white a little lambda function to place run inside a filter:

New Functor Filter with lambda support

This is in regards to the following topic: http://review.source.kitware.com/#/c/23352/ This patch introduces the UnaryGeneratorImageFilter BinaryGeneratorImageFilters, as replacements for the UnaryFunctorImageFilter and the BinaryFunctorImageFilters. The two big advantages are: Support for C++ lambda’s Removed class’s template parameter for functor, which enables reuse of a parent class. These new classes enable the setting for the functor with a “SetFunctor” method, where the type of functo…

I haven’t compiled this code, but it should be something like this:

using FilterType = itk::BinaryGeneratorImageFilter<InputImageType, MaskImageType OutputImageType>;
auto filter = FilterType::New();
filter->SetFunctor([](const InputPixelType &p1, const MaskPixelType &mask)->OutputPixelType
 { return mask!=1 || p1 > threshold; });