DOC: add '\ingroup in docs

include/otbRegionComparator.h

@@ -35,6 +35,11 @@ using namespace std;
 
 namespace otb {
 
+/* \class RegionComparator
+ * \brief Compare regions layout
+ *
+ *  \ingroup SimpleExtractionTools
+ */
 template<class TInputImage1, class TInputImage2=TInputImage1> class RegionComparator{
 public:
 

include/otbStatisticsImageCustomFilter.h

@@ -34,7 +34,7 @@ namespace otb
  * A value to ignore (in the stats) can be chosen
  *
  * \ingroup MathematicalStatisticsImageCustomFilters
- * \ingroup ITKImageStatistics
+ * \ingroup SimpleExtractionTools
  *
  * \wiki
  * \wikiexample{Statistics/StatisticsImageCustomFilter,Compute min\, max\, variance and mean of an Image.}

include/otbVectorDataToLabelImageCustomFilter.h

@@ -39,6 +39,7 @@ namespace otb {
  *
  *  OGRRegisterAll() method must have been called before applying filter.
  *
+ * \ingroup SimpleExtractionTools
  */
 template <class TVectorData, class TOutputImage  >
 class  ITK_EXPORT VectorDataToLabelImageCustomFilter :