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| <div class="floatcenter">[[File:ITK_Examples_Baseline_Iterators_TestConstantBoundaryCondition.png]]</div>
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| At the boundaries of an image, a NeighborhoodIterator will point to invalid pixels. This example demonstrates one method of handling these cases. It simply returns a specified constant value for any invalid pixel.
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| ==ConstantBoundaryCondition.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkConstNeighborhoodIterator.h"
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| #include "itkConstantBoundaryCondition.h"
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| #include "itkImageRegionIterator.h"
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| #include <itkImageToVTKImageFilter.h>
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| #include "vtkVersion.h"
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| #include "vtkImageViewer.h"
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| #include "vtkImageMapper3D.h"
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| #include "vtkRenderWindowInteractor.h"
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| #include "vtkSmartPointer.h"
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| #include "vtkImageActor.h"
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| #include "vtkInteractorStyleImage.h"
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| #include "vtkRenderer.h"
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| typedef itk::Image<unsigned char, 2> ImageType;
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| static void CreateImage(ImageType::Pointer image);
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| int main(int, char*[])
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| { | |
| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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|
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| ImageType::SizeType regionSize;
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| regionSize[0] = 50;
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| regionSize[1] = 1;
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| ImageType::IndexType regionIndex;
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| regionIndex[0] = 0;
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| regionIndex[1] = 0;
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| ImageType::RegionType region;
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| region.SetSize(regionSize);
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| region.SetIndex(regionIndex);
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| ImageType::SizeType radius;
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| radius[0] = 1;
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| radius[1] = 1;
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| typedef itk::ConstantBoundaryCondition<ImageType> BoundaryConditionType;
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| itk::ConstNeighborhoodIterator<ImageType, BoundaryConditionType> iterator(radius, image,region);
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| while(!iterator.IsAtEnd())
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| {
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| for(unsigned int i = 0; i < 9; i++)
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| {
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| ImageType::IndexType index = iterator.GetIndex(i);
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| std::cout << "Index: " << index
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| << " Pixel: " << i << " = "
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| << (int)iterator.GetPixel(i) << std::endl;
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| }
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| ++iterator;
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| }
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| // Visualize
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| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
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| ConnectorType::Pointer connector = ConnectorType::New();
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| connector->SetInput(image);
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| vtkSmartPointer<vtkImageActor> actor =
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| vtkSmartPointer<vtkImageActor>::New();
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| #if VTK_MAJOR_VERSION <= 5
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| actor->SetInput(connector->GetOutput());
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| #else
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| connector->Update();
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| actor->GetMapper()->SetInputData(connector->GetOutput());
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| #endif
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| vtkSmartPointer<vtkRenderWindow> renderWindow =
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| vtkSmartPointer<vtkRenderWindow>::New();
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| vtkSmartPointer<vtkRenderWindowInteractor> interactor =
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| vtkSmartPointer<vtkRenderWindowInteractor>::New();
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| interactor->SetRenderWindow(renderWindow);
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| vtkSmartPointer<vtkRenderer> renderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(renderer);
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| renderer->AddActor(actor);
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| renderer->ResetCamera();
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| renderWindow->Render();
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| vtkSmartPointer<vtkInteractorStyleImage> style =
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| vtkSmartPointer<vtkInteractorStyleImage>::New();
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| interactor->SetInteractorStyle(style);
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| interactor->Start();
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| return EXIT_SUCCESS;
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| }
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| void CreateImage(ImageType::Pointer image)
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| {
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| // Create an image with 2 connected components
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| ImageType::RegionType region;
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| ImageType::IndexType start;
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| start[0] = 0;
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| start[1] = 0;
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| ImageType::SizeType size;
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| unsigned int NumRows = 5;
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| unsigned int NumCols = 5;
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| size[0] = NumRows;
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| size[1] = NumCols;
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| region.SetSize(size);
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| region.SetIndex(start);
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| image->SetRegions(region); | |
| image->Allocate();
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| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
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| // Set all pixels to white
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| while(!imageIterator.IsAtEnd())
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| {
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| imageIterator.Set(255);
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| ++imageIterator;
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| }
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| }
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| </source>
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| {{ITKVTKCMakeLists|{{SUBPAGENAME}}}}
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