ITK/Examples/Iterators/ShapedNeighborhoodIteratorManual: Difference between revisions

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Crashes when initializing the iterator loop?
{{warning|1=The media wiki content on this page is no longer maintained.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 releases.  In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.
}}


==ShapedNeighborhoodIterator.cxx==
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
<source lang="cpp">
#include "itkImage.h"
#include "itkShapedNeighborhoodIterator.h"
#include "itkImageRegionIterator.h"
 
#include <itkImageToVTKImageFilter.h>
 
#include "vtkImageViewer.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkSmartPointer.h"
#include "vtkImageActor.h"
#include "vtkInteractorStyleImage.h"
#include "vtkRenderer.h"
 
typedef itk::Image<unsigned char, 2>  ImageType;
 
void CreateImage(ImageType::Pointer image);
 
int main(int, char*[])
{
  ImageType::Pointer image = ImageType::New();
  ImageType::SizeType radius;
  radius[0] = 1;
  radius[1] = 1;
 
  typedef itk::ShapedNeighborhoodIterator<ImageType> IteratorType;
  IteratorType iterator(radius, image, image->GetLargestPossibleRegion());
 
  /*
  // a smaller region
  ImageType::RegionType region;
  ImageType::IndexType start;
  start[0] = 5;
  start[1] = 5;
 
  ImageType::SizeType size;
  size[0] = 3;
  size[1] = 4;
 
  region.SetSize(size);
  region.SetIndex(start);
  IteratorType iterator(radius, image, region);
  */
 
  IteratorType::OffsetType top = {{0,-1}};
  IteratorType::OffsetType bottom = {{0,1}};
  IteratorType::OffsetType left = {{-1,0}};
  IteratorType::OffsetType right = {{1,0}};
  iterator.ActivateOffset(top);
  iterator.ActivateOffset(bottom);
  iterator.ActivateOffset(left);
  iterator.ActivateOffset(right);
 
  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;
    }
 
  // Visualize
  typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
  ConnectorType::Pointer connector = ConnectorType::New();
  connector->SetInput(image);
 
  vtkSmartPointer<vtkImageActor> actor =
    vtkSmartPointer<vtkImageActor>::New();
  actor->SetInput(connector->GetOutput());
 
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
 
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(renderer);
 
  renderer->AddActor(actor);
  renderer->ResetCamera();
 
  renderWindow->Render();
 
  vtkSmartPointer<vtkInteractorStyleImage> style =
    vtkSmartPointer<vtkInteractorStyleImage>::New();
 
  interactor->SetInteractorStyle(style);
 
  interactor->Start();
 
  return EXIT_SUCCESS;
}
 
void CreateImage(ImageType::Pointer image)
{
  // Create an image
  ImageType::RegionType region;
  ImageType::IndexType start;
  start[0] = 0;
  start[1] = 0;
 
  ImageType::SizeType size;
  unsigned int NumRows = 20;
  unsigned int NumCols = 30;
  size[0] = NumRows;
  size[1] = NumCols;
 
  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>

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]