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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| | {{warning|1=The media wiki content on this page is no longer maintained.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 releases. In many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}} |
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| ==ImageRegionIteratorWithIndex.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 "itkImageRegionIteratorWithIndex.h"
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| #include <itkImageToVTKImageFilter.h>
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| #include "vtkImageViewer.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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| int main(int argc, char*argv[])
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| {
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| if(argc < 2)
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| {
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| std::cerr << "Required: filename" << std::endl;
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| return EXIT_FAILURE;
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| }
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| typedef itk::Image<unsigned char, 2> ImageType;
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| typedef itk::ImageFileReader<ImageType> ReaderType;
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| ReaderType::Pointer reader = ReaderType::New();
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| reader->SetFileName(argv[1]);
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| reader->Update();
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| ImageType::Pointer image = reader->GetOutput();
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|
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| ImageType::SizeType regionSize;
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| regionSize[0] = 5;
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| regionSize[1] = 4;
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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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| itk::ImageRegionIteratorWithIndex<ImageType> imageIterator(image,image->GetLargestPossibleRegion()); | |
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| while(!imageIterator.IsAtEnd())
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| {
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| std::cout << "Index: " << imageIterator.GetIndex() << " value: " << imageIterator.Get() << std::endl;
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|
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| // Set the current pixel to white
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| imageIterator.Set(255);
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|
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| ++imageIterator;
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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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| actor->SetInput(connector->GetOutput());
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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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| </source>
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| {{ITKVTKCMakeLists|ImageRegionIteratorWithIndex|}}
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