ITK/Examples/Iterators/ConstNeighborhoodIterator

This example demonstrates how to traverse an itkImage with access to a rectangular neighborhood around the center pixel of the iterator (without write access to the pixels).

ConstNeighborhoodIterator.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"
3. include "itkConstNeighborhoodIterator.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::ConstNeighborhoodIterator<ImageType> iterator(radius, image,region);

 while(!iterator.IsAtEnd())
   {
   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);

     }
   ++iterator;
   }

 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

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

PROJECT(ConstNeighborhoodIterator)

include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)

FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE})

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

ADD_EXECUTABLE(ConstNeighborhoodIterator ConstNeighborhoodIterator.cxx) TARGET_LINK_LIBRARIES(ConstNeighborhoodIterator vtkHybrid ITKNumerics ITKBasicFilters ITKCommon ITKIO)

</source>