ITK/Examples/ImageProcessing/ProcessingNthImageElement

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This example is related to: http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/NthElementImageAdaptor

It simply demonstrates that to use the output of an ImageAdaptor the template argument of the next filter in the pipeline must be the AdaptorType.

ProcessingNthImageElement.cxx

#include "itkImageAdaptor.h"
#include "itkImageRegionIterator.h"
#include "itkNthElementImageAdaptor.h"
#include "itkBinomialBlurImageFilter.h"
 
typedef itk::Image<itk::CovariantVector< float, 3>, 2> VectorImageType;
 
static void CreateImage(VectorImageType::Pointer image);
 
int main(int, char *[])
{
  VectorImageType::Pointer image = VectorImageType::New();
  CreateImage(image);
 
  typedef itk::NthElementImageAdaptor<VectorImageType,
    float> ImageAdaptorType;
 
  ImageAdaptorType::Pointer adaptor = ImageAdaptorType::New();
 
  adaptor->SelectNthElement(0);
  adaptor->SetImage(image);
 
  typedef itk::BinomialBlurImageFilter<ImageAdaptorType, itk::Image<float,2> >  BlurFilterType;
  BlurFilterType::Pointer blurFilter = BlurFilterType::New();
  blurFilter->SetInput(adaptor);
  blurFilter->Update();
 
  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;
    }
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
project(ProcessingNthImageElement)
 
find_package(ITK REQUIRED)
include(${ITK_USE_FILE})
 
add_executable(ProcessingNthImageElement ProcessingNthImageElement.cxx)
 
if( "${ITK_VERSION_MAJOR}" LESS 4 )
  target_link_libraries(ProcessingNthImageElement ITKReview ${ITK_LIBRARIES})
else( "${ITK_VERSION_MAJOR}" LESS 4 )
  target_link_libraries(ProcessingNthImageElement ${ITK_LIBRARIES})
endif( "${ITK_VERSION_MAJOR}" LESS 4 )
Retrieved from "http://www.itk.org/Wiki/ITK/Examples/ImageProcessing/ProcessingNthImageElement"
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