+ // Label extraction
+ TLabelFunction::Pointer label_function = TLabelFunction::New( );
+ label_function->SetLabel( label );
+ label_function->SetInsideValue( 255 );
+ label_function->SetOutsideValue( 0 );
+
+ TLabelExtractor::Pointer label_extractor = TLabelExtractor::New( );
+ label_extractor->SetInput( filter->GetMarks( ) );
+ label_extractor->SetFunction( label_function );
+
+