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| ==Description== | | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| Relabel the components (blobs) in an image such that consecutive labels are used. This example creates a black image with one rectangle consisting of pixels with value 100 and a second rectangle consisting of pixels with value 200. There are three resulting components (the background and the two rectangles). The relabel filter labels these three components 0, 1, and 2.
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| ==Displayed Output==
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| The original image and an intensity scaled version of the relabeled image. | |
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| ==RelabelComponentImageFilter.cxx==
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| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkTranslationTransform.h"
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| #include "itkImageFileReader.h"
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| #include "itkNormalizeImageFilter.h"
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| #include "itkRelabelComponentImageFilter.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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| #include "vtkPolyDataMapper.h"
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| #include "vtkActor.h"
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| #include "vtkProperty.h"
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| #include "vtkSphereSource.h"
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| typedef itk::Image<unsigned char, 2> ImageType;
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| void CreateImage(ImageType::Pointer image);
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| int main(int, char *[])
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| {
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| ImageType::Pointer image = ImageType::New();
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| CreateImage(image);
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|
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| typedef itk::ImageToVTKImageFilter<ImageType> ConnectorType;
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| ConnectorType::Pointer originalConnector = ConnectorType::New();
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| originalConnector->SetInput(image);
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| vtkSmartPointer<vtkImageActor> originalActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| originalActor->SetInput(originalConnector->GetOutput());
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| itk::RelabelComponentImageFilter<ImageType, ImageType>::Pointer relabelFilter =
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| itk::RelabelComponentImageFilter<ImageType, ImageType>::New();
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| relabelFilter->SetInput(image);
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| relabelFilter->Update();
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| ConnectorType::Pointer relabeledConnector = ConnectorType::New();
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| relabeledConnector->SetInput(relabelFilter->GetOutput());
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| vtkSmartPointer<vtkImageActor> relabeledActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| relabeledActor->SetInput(relabeledConnector->GetOutput());
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| // There will be one render window
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| vtkSmartPointer<vtkRenderWindow> renderWindow =
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| vtkSmartPointer<vtkRenderWindow>::New();
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| renderWindow->SetSize(600, 300);
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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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| // Define viewport ranges
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| // (xmin, ymin, xmax, ymax)
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| double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
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| double rightViewport[4] = {0.5, 0.0, 1.0, 1.0}; | |
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| // Setup both renderers
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| vtkSmartPointer<vtkRenderer> leftRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(leftRenderer);
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| leftRenderer->SetViewport(leftViewport);
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| leftRenderer->SetBackground(.6, .5, .4);
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| vtkSmartPointer<vtkRenderer> rightRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(rightRenderer);
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| rightRenderer->SetViewport(rightViewport);
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| rightRenderer->SetBackground(.4, .5, .6);
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| // Add the sphere to the left and the cube to the right
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| leftRenderer->AddActor(originalActor);
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| rightRenderer->AddActor(relabeledActor);
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| leftRenderer->ResetCamera();
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| rightRenderer->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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| size[0] = 200;
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| size[1] = 300;
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| region.SetSize(size);
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| region.SetIndex(start);
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| image->SetRegions(region);
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| image->Allocate();
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| itk::ImageRegionIterator<ImageType> imageIterator(image,region);
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| while(!imageIterator.IsAtEnd())
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| {
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| if(imageIterator.GetIndex()[0] > 100 &&
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| imageIterator.GetIndex()[0] < 150 &&
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| imageIterator.GetIndex()[1] > 100 &&
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| imageIterator.GetIndex()[1] < 150)
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| {
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| imageIterator.Set(100);
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| }
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| else if(imageIterator.GetIndex()[0] > 50 &&
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| imageIterator.GetIndex()[0] < 70 &&
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| imageIterator.GetIndex()[1] > 50 &&
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| imageIterator.GetIndex()[1] < 70)
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| {
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| imageIterator.Set(200);
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| }
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| else
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| {
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| imageIterator.Set(0);
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| }
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| ++imageIterator;
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| }
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| }
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| </source>
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| {{ITKVTKCMakeLists|RelabelComponentImageFilter|}}
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