ITK/Examples/Iterators/ImageRegionIteratorWithIndex

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This example demonstrates how to traverse an itkImage. This iterator varies from ImageRegionIterator in that it provides efficient access to the location (index) of the current pixel.

ITK Examples Baseline Iterators TestImageRegionIteratorWithIndex.png

Contents

ImageRegionIteratorWithIndex.cxx

#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageRegionIteratorWithIndex.h"
 
#include "QuickView.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] = 5;
  regionSize[1] = 4;
 
  ImageType::IndexType regionIndex;
  regionIndex[0] = 0;
  regionIndex[1] = 0;
 
  ImageType::RegionType region;
  region.SetSize(regionSize);
  region.SetIndex(regionIndex);
 
  itk::ImageRegionIteratorWithIndex<ImageType> imageIterator(image,region);
 
  while(!imageIterator.IsAtEnd())
    {
    std::cout << "Index: " << imageIterator.GetIndex() << " value: " << imageIterator.Get() << std::endl;
 
    // Set the current pixel to white
    imageIterator.Set(255);
 
    ++imageIterator;
    }
 
  // Visualize
  QuickView viewer;
  viewer.AddImage<ImageType>( image );  
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
project(ImageRegionIteratorWithIndex)
 
find_package(ItkVtkGlue REQUIRED)
include(${ItkVtkGlue_USE_FILE})
 
add_executable(ImageRegionIteratorWithIndex ImageRegionIteratorWithIndex.cxx)
target_link_libraries(ImageRegionIteratorWithIndex
  ItkVtkGlue  ${VTK_LIBRARIES} ${ITK_LIBRARIES})

Building All of the Examples

Many of the examples in the ITK Wiki Examples Collection require VTK. You can build all of the the examples by following these instructions. If you are a new VTK user, you may want to try the Superbuild which will build a proper ITK and VTK.

ItkVtkGlue

If you download the entire ITK Wiki Examples Collection, the ItkVtkGlue directory will be included and configured. If you wish to just build a few examples, then you will need to download ItkVtkGlue and build it. When you run cmake it will ask you to specify the location of the ItkVtkGlue binary directory.

Retrieved from "http://www.kwwidgets.org/Wiki/ITK/Examples/Iterators/ImageRegionIteratorWithIndex"
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