ENH: Preparation of the NCC example for software guide output

Examples/DisparityMap/NCCRegistrationFilterExample.cxx

@@ -51,6 +51,10 @@
 #include "itkWarpImageFilter.h"
 // Software Guide : EndCodeSnippet
 
+#include "otbImageOfVectorsToMonoChannelExtractROI.h"
+#include "itkRescaleIntensityImageFilter.h"
+#include "itkCastImageFilter.h"
+
 #include <iostream>
 
 
@@ -73,6 +77,8 @@ int main(int argc, char** argv )
 
   typedef double                   CoordinateRepresentationType;
 
+  typedef unsigned char                         OutputPixelType;
+  typedef otb::Image<OutputPixelType,ImageDimension> OutputImageType;
   
     // Software Guide : BeginLatex
   //
@@ -187,11 +193,24 @@ int main(int argc, char** argv )
   // Software Guide : EndCodeSnippet
 
 
-  typedef otb::ImageFileWriter< DeformationFieldType > DFWriterType;
+  typedef otb::ImageOfVectorsToMonoChannelExtractROI<DeformationFieldType, MovingImageType> ChannelExtractionFilterType;
+  ChannelExtractionFilterType::Pointer channelExtractor = ChannelExtractionFilterType::New();
+
+  channelExtractor->SetInput(registrator->GetOutput());
+  channelExtractor->SetChannel(1);
+  
+  typedef itk::RescaleIntensityImageFilter<MovingImageType, OutputImageType> RescalerType;
+  RescalerType::Pointer fieldRescaler = RescalerType::New();
+  
+  fieldRescaler->SetInput(channelExtractor->GetOutput());
+  fieldRescaler->SetOutputMaximum(255);
+  fieldRescaler->SetOutputMinimum(0);
+  
+  typedef otb::ImageFileWriter< OutputImageType > DFWriterType;
 
   DFWriterType::Pointer dfWriter = DFWriterType::New();
   dfWriter->SetFileName(argv[3]);
-  dfWriter->SetInput( registrator->GetOutput() );
+  dfWriter->SetInput( fieldRescaler->GetOutput() );
   dfWriter->Update();
 
   
@@ -204,11 +223,17 @@ int main(int argc, char** argv )
   warper->SetDeformationField( registrator->GetOutput() );
   warper->SetEdgePaddingValue( padValue );
   
-  typedef otb::ImageFileWriter< MovingImageType > WriterType;
+  
+  
+  typedef itk::CastImageFilter< MovingImageType, OutputImageType > CastFilterType;
+  CastFilterType::Pointer  caster =  CastFilterType::New();
+  caster->SetInput( warper->GetOutput() );
+  
+  typedef otb::ImageFileWriter< OutputImageType > WriterType;
 
   WriterType::Pointer writer = WriterType::New();
   writer->SetFileName(argv[4]);
-  writer->SetInput( warper->GetOutput() );
+  writer->SetInput( caster->GetOutput() );
   writer->Update();
   
   // Software Guide : BeginLatex