ITK/Examples/ImageProcessing/ImageAdaptorExtractVectorComponent

ImageAdaptorExtractVectorComponent.cxx

<source lang="cpp">

1. include "itkImageAdaptor.h"
2. include "itkImageRegionIterator.h"

typedef itk::Image<float, 2> ScalarImageType; typedef itk::Image<itk::CovariantVector< float, 3>, 2> VectorImageType;

void CreateImage(VectorImageType::Pointer image);

class VectorPixelAccessor { public:

 typedef itk::CovariantVector<float,3>   InternalType;
 typedef                      float      ExternalType;

 void operator=( const VectorPixelAccessor & vpa )
   {
     m_Index = vpa.m_Index;
   }
 ExternalType Get( const InternalType & input ) const
   {
   return static_cast<ExternalType>( input[ m_Index ] );
   }
 void SetIndex( unsigned int index )
   {
   m_Index = index;
   }

private:

 unsigned int m_Index;

};

int main(int, char *[]) {

 VectorImageType::Pointer image = VectorImageType::New();
 CreateImage(image);

 itk::Index<2> index;
 index.Fill(0);
 
 std::cout << image->GetPixel(index) << std::endl;
 
 typedef itk::ImageAdaptor<  VectorImageType,
                             VectorPixelAccessor > ImageAdaptorType;

 ImageAdaptorType::Pointer adaptor = ImageAdaptorType::New();

 VectorPixelAccessor  accessor;
 accessor.SetIndex(0);
 adaptor->SetPixelAccessor( accessor );
 adaptor->SetImage(image);

 std::cout << adaptor->GetPixel(index) << std::endl;
 
 return EXIT_SUCCESS;

}

void CreateImage(VectorImageType::Pointer image) {

 VectorImageType::IndexType start;
 start.Fill(0);

 VectorImageType::SizeType size;
 size.Fill(2);

 VectorImageType::RegionType region;
 region.SetSize(size);
 region.SetIndex(start);

 image->SetRegions(region);
 image->Allocate();
 
 itk::ImageRegionIterator<VectorImageType> imageIterator(image,image->GetLargestPossibleRegion());
 itk::CovariantVector<float, 3> vec;
 vec[0] = 1;
 vec[1] = 2;
 vec[2] = 3;
 
 while(!imageIterator.IsAtEnd())
   {
   imageIterator.Set(vec);

   ++imageIterator;
   }

} </source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(ImageAdaptorExtractVectorComponent)

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(ImageAdaptorExtractVectorComponent ImageAdaptorExtractVectorComponent.cxx) TARGET_LINK_LIBRARIES(ImageAdaptorExtractVectorComponent ITKIO)

</source>