SphinxExamples/src/Developer/ImageFilter.cxx

#include "itkImage.h"
 
#include "ImageFilter.h"
 
template <typename TImage>
static void
CreateImage(TImage * const image);
 
int
main()
{
  // Setup types
  using ImageType = itk::Image<int, 2>;
  using FilterType = itk::ImageFilter<ImageType>;
 
  auto image = ImageType::New();
  CreateImage(image.GetPointer());
 
  // Create and the filter
  auto filter = FilterType::New();
  filter->SetInput(image);
  filter->Update();
 
  itk::Index<2> cornerPixel = image->GetLargestPossibleRegion().GetIndex();
 
  // The output here is:
  // 0
  // 3
  // That is, the filter changed the pixel, but the input remained unchagned.
  std::cout << image->GetPixel(cornerPixel) << std::endl;
  std::cout << filter->GetOutput()->GetPixel(cornerPixel) << std::endl;
 
  return EXIT_SUCCESS;
}
 
 
template <typename TImage>
void
CreateImage(TImage * const image)
{
  // Create an image with 2 connected components
  typename TImage::IndexType corner = { { 0, 0 } };
 
  unsigned int              NumRows = 200;
  unsigned int              NumCols = 300;
  typename TImage::SizeType size = { { NumRows, NumCols } };
 
  typename TImage::RegionType region(corner, size);
 
  image->SetRegions(region);
  image->Allocate();
 
  image->FillBuffer(0);
}