ITK/Examples/Iterators/ImageRegionConstIterator

This example demonstrates how to traverse an itkImage without write access to the pixels.

ImageRegionConstIterator.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"
3. include "itkImageRegionConstIterator.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::ImageRegionConstIterator<ImageType> imageIterator(image,region);
 //itk::ImageRegionConstIterator<ImageType> imageIterator(image,image->GetLargestPossibleRegion());

 while(!imageIterator.IsAtEnd())
   {
   // Get the value of the current pixel
   unsigned char val = imageIterator.Get();
   std::cout << (int)val << std::endl;

   ++imageIterator;
   }

 return EXIT_SUCCESS;

}

</source>

CMakeLists.txt

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

PROJECT(ImageRegionConstIterator)

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(ImageRegionConstIterator ImageRegionConstIterator.cxx) TARGET_LINK_LIBRARIES(ImageRegionConstIterator vtkHybrid ITKNumerics ITKBasicFilters ITKCommon ITKIO)

</source>