ITK/Examples/Iterators/ShapedNeighborhoodIteratorManual

ShapedNeighborhoodIterator.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkShapedNeighborhoodIterator.h"
3. include "itkImageRegionIterator.h"
4. include "itkNeighborhoodAlgorithm.h"

typedef itk::Image<unsigned char, 2> ImageType;

void CreateImage(ImageType::Pointer image);

int main(int, char*[]) {

 ImageType::Pointer image = ImageType::New();
 CreateImage(image);
 ImageType::SizeType radius;
 radius[0] = 1;
 radius[1] = 1;

 typedef itk::ShapedNeighborhoodIterator<ImageType> IteratorType;

 IteratorType::OffsetType top = Template:0,-1;
 IteratorType::OffsetType bottom = Template:0,1;
 IteratorType::OffsetType left = Template:-1,0;
 IteratorType::OffsetType right = Template:1,0;
 IteratorType::OffsetType center = Template:0,0;

 typedef itk::NeighborhoodAlgorithm
   ::ImageBoundaryFacesCalculator< ImageType > FaceCalculatorType;

 FaceCalculatorType faceCalculator;
 FaceCalculatorType::FaceListType faceList;
 faceList = faceCalculator(image, image->GetLargestPossibleRegion(),
                           radius);
 FaceCalculatorType::FaceListType::iterator faceListIterator;

 for ( faceListIterator=faceList.begin(); faceListIterator != faceList.end(); ++faceListIterator)
   {
   IteratorType iterator(radius, image, *faceListIterator);
   iterator.ActivateOffset(top);
   iterator.ActivateOffset(bottom);
   iterator.ActivateOffset(left);
   iterator.ActivateOffset(right);
   iterator.ActivateOffset(center);

   for(iterator.GoToBegin(); !iterator.IsAtEnd(); ++iterator) // Crashes here!
     {
     std::cout << "top: " << iterator[top] << std::endl;
     std::cout << "bottom: " << iterator[bottom] << std::endl;
     std::cout << "left: " << iterator[left] << std::endl;
     std::cout << "right: " << iterator[right] << std::endl;
     }
   }

 return EXIT_SUCCESS;

}

void CreateImage(ImageType::Pointer image) {

 // Create an image with 2 connected components
 ImageType::RegionType region;
 ImageType::IndexType start;
 start[0] = 0;
 start[1] = 0;

 ImageType::SizeType size;
 size[0] = 100;
 size[1] = 200;

 region.SetSize(size);
 region.SetIndex(start);

 image->SetRegions(region);
 image->Allocate();

 itk::ImageRegionIterator<ImageType> imageIterator(image,region);

 while(!imageIterator.IsAtEnd())
   {
   imageIterator.Set(0);

   ++imageIterator;
   }

} </source>

CMakeLists.txt

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

PROJECT(ShapedNeighborhoodIterator)

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

</source>