ITK/Examples/Iterators/ImageRegionIteratorWithIndex: Difference between revisions

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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.
{{warning|1=The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/*  pages likely require ITK version 4.13 or earlier releasesIn many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}}
 
<div class="floatcenter">[[File:ITK_Examples_Baseline_Iterators_TestImageRegionIteratorWithIndex.png]]</div>
==ImageRegionIteratorWithIndex.cxx==
<source lang="cpp">
#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;
}
 
</source>
 
{{ITKVTKCMakeLists|ImageRegionIteratorWithIndex|}}

Latest revision as of 15:16, 6 June 2019

Warning: The media wiki content on this page is no longer maintained. The examples presented on the https://itk.org/Wiki/* pages likely require ITK version 4.13 or earlier releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.