ENH: Wrap LabelSetMeasures in LabelOverlapMeasuresImageFilter

This exposes the return value from
itk::LabelOverlapMeasuresImageFilter::GetLabelSetMeasures()
as a Python dictionary instead of
<Swig Object of type 'std::unordered_map< unsigned char,itkLabelOverlapMeasuresImageFilterIUC3::LabelSetMeasures > *'>
This is needed for convenient use of the class from Python.
The class has been un-nested to make wrapping easier/possible.

Modules/Filtering/ImageStatistics/include/itkLabelOverlapMeasuresImageFilter.h

@@ -25,6 +25,22 @@
 
 namespace itk
 {
+/** \class LabelOverlapLabelSetMeasures
+ * \brief Metrics stored per label
+ * \ingroup ITKImageStatistics
+ */
+class LabelOverlapLabelSetMeasures
+{
+public:
+  // default constructor/copy/move etc...
+
+  SizeValueType m_Source{ 0 };
+  SizeValueType m_Target{ 0 };
+  SizeValueType m_Union{ 0 };
+  SizeValueType m_Intersection{ 0 };
+  SizeValueType m_SourceComplement{ 0 };
+  SizeValueType m_TargetComplement{ 0 };
+};
 
 /** \class LabelOverlapMeasuresImageFilter
  * \brief Computes overlap measures between the set same set of labels of
@@ -73,25 +89,14 @@ class ITK_TEMPLATE_EXPORT LabelOverlapMeasuresImageFilter : public ImageSink<TLa
   /** Type to use for computations. */
   using RealType = typename NumericTraits<LabelType>::RealType;
 
-  /** \class LabelSetMeasures
-   * \brief Metrics stored per label
-   * \ingroup ITKImageStatistics
-   */
-  class LabelSetMeasures
-  {
-  public:
-    // default constructor/copy/move etc...
+#ifndef ITK_FUTURE_LEGACY_REMOVE
+  /** Type to use for computations. */
+  using LabelSetMeasures = LabelOverlapLabelSetMeasures;
+#endif // !ITK_FUTURE_LEGACY_REMOVE
 
-    SizeValueType m_Source{ 0 };
-    SizeValueType m_Target{ 0 };
-    SizeValueType m_Union{ 0 };
-    SizeValueType m_Intersection{ 0 };
-    SizeValueType m_SourceComplement{ 0 };
-    SizeValueType m_TargetComplement{ 0 };
-  };
 
   /** Type of the map used to store data per label */
-  using MapType = std::unordered_map<LabelType, LabelSetMeasures>;
+  using MapType = std::unordered_map<LabelType, LabelOverlapLabelSetMeasures>;
   using MapIterator = typename MapType::iterator;
   using MapConstIterator = typename MapType::const_iterator;
 

Modules/Filtering/ImageStatistics/wrapping/CMakeLists.txt

@@ -1,2 +1,6 @@
 itk_wrap_module(ITKImageStatistics)
+if(ITK_WRAP_PYTHON)
+  set(WRAPPER_SUBMODULE_ORDER itkLabelOverlapMeasuresImageFilter_LabelSetMeasures)
+  list(APPEND WRAPPER_SWIG_LIBRARY_FILES "${CMAKE_CURRENT_LIST_DIR}/itkLabelOverlapMeasuresImageFilter.i")
+endif()
 itk_auto_load_and_end_wrap_submodules()

Modules/Filtering/ImageStatistics/wrapping/itkLabelOverlapMeasuresImageFilter.i

@@ -0,0 +1,10 @@
+%include <std_unordered_map.i>
+
+%template(hashmapUCLOLSM)    std::unordered_map< unsigned char, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapSCLOLSM)    std::unordered_map< signed char, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapUSLOLSM)    std::unordered_map< unsigned short, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapSSLOLSM)    std::unordered_map< signed short, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapULLOLSM)    std::unordered_map< unsigned long, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapSLLOLSM)    std::unordered_map< signed long, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapULLLOLSM)   std::unordered_map< unsigned long long, itk::LabelOverlapLabelSetMeasures >;
+%template(hashmapSLLLOLSM)   std::unordered_map< signed long long, itk::LabelOverlapLabelSetMeasures >;

Modules/Filtering/ImageStatistics/wrapping/itkLabelOverlapMeasuresImageFilter_LabelSetMeasures.wrap

@@ -0,0 +1,4 @@
+set(WRAPPER_AUTO_INCLUDE_HEADERS OFF)
+itk_wrap_include("itkLabelOverlapMeasuresImageFilter.h")
+itk_wrap_simple_class("itk::LabelOverlapLabelSetMeasures")
+set(WRAPPER_AUTO_INCLUDE_HEADERS ON)

Wrapping/Generators/Python/PyBase/pyBase.i

@@ -23,6 +23,7 @@ from . import _ITKCommonPython
 %include <std_pair.i>
 %include <std_vector.i>
 %include <std_map.i>
+%include <std_unordered_map.i>
 %include <std_list.i>
 %include <std_set.i>