ITK/Examples/Iterators/ShapedNeighborhoodIteratorManual: Difference between revisions

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==ShapedNeighborhoodIterator_Manual.cxx==
{{warning|1=The media wiki content on this page is no longer maintainedThe 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.
<source lang="cpp">
}}
#include "itkImage.h"
#include "itkShapedNeighborhoodIterator.h"
#include "itkImageRegionIterator.h"
#include "itkNeighborhoodAlgorithm.h"
   
// Notice that char type pixel values will not appear
// properly on the command prompt therefore for the
// demonstration purposes it is best to use the int
// type, however in real applications iterators have
// no problems with char type images.
//typedef itk::Image<unsigned char, 2>  ImageType;
typedef itk::Image<unsigned int, 2>  ImageType;
void CreateImage(ImageType::Pointer image);
int main(int, char*[])
{
  ImageType::Pointer image = ImageType::New();
  CreateImage(image);
  typedef itk::ShapedNeighborhoodIterator<ImageType> IteratorType;


  itk::Size<2> radius;
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
  radius.Fill(1);
  IteratorType iterator(radius, image, image->GetLargestPossibleRegion());
  std::cout << "By default there are " << iterator.GetActiveIndexListSize() << " active indices." << std::endl;
 
  IteratorType::OffsetType top = {{0,-1}};
  iterator.ActivateOffset(top);
  IteratorType::OffsetType bottom = {{0,1}};
  iterator.ActivateOffset(bottom);
 
  std::cout << "Now there are " << iterator.GetActiveIndexListSize() << " active indices." << std::endl;
 
  IteratorType::IndexListType indexList = iterator.GetActiveIndexList();
  IteratorType::IndexListType::const_iterator listIterator = indexList.begin();
  while (listIterator != indexList.end())
    {
    std::cout << *listIterator << " ";
    ++listIterator;
    }
  std::cout << std::endl;
 
  // Note that ZeroFluxNeumannBoundaryCondition is used by default so even
  // pixels outside of the image will have valid values (equivalent to their neighbors just inside the image)
  for(iterator.GoToBegin(); !iterator.IsAtEnd(); ++iterator)
    {
    std::cout << "New position: " << std::endl;
    IteratorType::ConstIterator ci = iterator.Begin();
 
    while (! ci.IsAtEnd())
      {
      std::cout << "Centered at " << iterator.GetIndex() << std::endl;
      std::cout << "Neighborhood index " << ci.GetNeighborhoodIndex()
<< " is offset " << ci.GetNeighborhoodOffset()
<< " and has value " << ci.Get()
<< " The real index is " << iterator.GetIndex() + ci.GetNeighborhoodOffset() << std::endl;
      ci++;
      }
    }
   
  std::cout << std::endl;
   
  return EXIT_SUCCESS;
}
void CreateImage(ImageType::Pointer image)
{
  ImageType::IndexType start;
  start.Fill(0);
  ImageType::SizeType size;
  size.Fill(10);
 
  ImageType::RegionType region(start,size);
 
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);
}
 
</source>
 
{{ITKCMakeLists|ShapedNeighborhoodIterator_Manual}}

Latest revision as of 15:56, 31 May 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.

[ITK Sphinx Examples]