ITK  5.0.0
Insight Segmentation and Registration Toolkit
WikiExamples/Developer/ImageFilter.cxx
#include "itkImage.h"
#include "ImageFilter.h"
template <typename TImage>
static void CreateImage(TImage* const image);
int main(int, char*[])
{
// Setup types
using ImageType = itk::Image<int, 2>;
using FilterType = itk::ImageFilter<ImageType>;
ImageType::Pointer image = ImageType::New();
CreateImage(image.GetPointer());
// Create and the filter
FilterType::Pointer 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);
}