ITK/Examples/Iterators/NeighborhoodIterator

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkNeighborhoodIterator.h"
 
#include <itkImageToVTKImageFilter.h>
 
#include "vtkVersion.h"
#include "vtkImageViewer.h"
#include "vtkImageMapper3D.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
 
int main(int argc, char*argv[])
{
  if(argc < 2)
    {
    std::cerr << "Required: filename" << std::endl;
    return EXIT_FAILURE;
    }
 
  typedef itk::Image<unsigned char, 2>  ImageType;
 
  typedef itk::ImageFileReader<ImageType> ReaderType;
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName(argv[1]);
  reader->Update();
 
  ImageType::Pointer image = reader->GetOutput();
 
  ImageType::SizeType regionSize;
  regionSize[0] = 50;
  regionSize[1] = 1;
 
  ImageType::IndexType regionIndex;
  regionIndex[0] = 0;
  regionIndex[1] = 0;
 
  ImageType::RegionType region;
  region.SetSize(regionSize);
  region.SetIndex(regionIndex);
 
  ImageType::SizeType radius;
  radius[0] = 1;
  radius[1] = 1;
 
  itk::NeighborhoodIterator<ImageType> iterator(radius, image,region);
 
 
  while(!iterator.IsAtEnd())
    {
    // Set the current pixel to white
    iterator.SetCenterPixel(255);
 
    for(unsigned int i = 0; i < 9; i++)
      {
      ImageType::IndexType index = iterator.GetIndex(i);
      std::cout << index[0] << " " << index[1] << std::endl;
 
      bool IsInBounds;
      iterator.GetPixel(i, IsInBounds);
      if(IsInBounds)
        {
        iterator.SetPixel(i,255);
        }
      }
    ++iterator;
    }
 
  // Visualize
  typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
  ConnectorType::Pointer connector = ConnectorType::New();
  connector->SetInput(image);
 
  vtkSmartPointer<vtkImageActor> actor =
    vtkSmartPointer<vtkImageActor>::New();
#if VTK_MAJOR_VERSION <= 5
  actor->SetInput(connector->GetOutput());
#else
  connector->Update();
  actor->GetMapper()->SetInputData(connector->GetOutput());
#endif
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(renderer);
 
  renderer->AddActor(actor);
  renderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
 
  interactor->SetInteractorStyle(style);
 
  interactor->Start();
 
  return EXIT_SUCCESS;
}