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| <div class="floatcenter">[[File:ITK_Examples_Baseline_Statistics_TestScalarImageKmeansImageFilter.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| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| ==ScalarImageKmeansImageFilter.cxx==
| |
| <source lang="cpp">
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| #include "itkImageFileReader.h"
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| #include "itkImageFileWriter.h"
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| #include "itkScalarImageKmeansImageFilter.h"
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| #include "itkRelabelComponentImageFilter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| #include "itkImageRegionIterator.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 "vtkImageMapper3D.h"
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| #include "vtkInteractorStyleImage.h"
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| #include "vtkRenderer.h"
| |
| | |
| 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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| | |
| typedef itk::ScalarImageKmeansImageFilter< ImageType > KMeansFilterType;
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| | |
| KMeansFilterType::Pointer kmeansFilter = KMeansFilterType::New();
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| | |
| kmeansFilter->SetInput(image);
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| kmeansFilter->SetUseNonContiguousLabels(true);
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| kmeansFilter->AddClassWithInitialMean(8);
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| kmeansFilter->AddClassWithInitialMean(110);
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| kmeansFilter->AddClassWithInitialMean(210);
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| kmeansFilter->Update();
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| | |
| KMeansFilterType::ParametersType estimatedMeans = kmeansFilter->GetFinalMeans();
| |
| | |
| const unsigned int numberOfClasses = estimatedMeans.Size();
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| | |
| for(unsigned int i = 0 ; i < numberOfClasses ; ++i)
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| {
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| std::cout << "cluster[" << i << "] ";
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| std::cout << " estimated mean : " << estimatedMeans[i] << std::endl;
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| }
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| | |
| typedef KMeansFilterType::OutputImageType OutputImageType;
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| | |
| typedef itk::RelabelComponentImageFilter<
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| OutputImageType,
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| OutputImageType > RelabelFilterType;
| |
| | |
| RelabelFilterType::Pointer relabeler = RelabelFilterType::New();
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| | |
| relabeler->SetInput( kmeansFilter->GetOutput() );
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| | |
| typedef itk::RescaleIntensityImageFilter< ImageType, ImageType > RescaleFilterType;
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| RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
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| rescaleFilter->SetInput(relabeler->GetOutput());
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| rescaleFilter->SetOutputMinimum(0);
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| rescaleFilter->SetOutputMaximum(255);
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| | |
| typedef std::vector< unsigned long > SizesType;
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| | |
| const SizesType & sizes = relabeler->GetSizeOfObjectsInPixels();
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| | |
| SizesType::const_iterator sizeItr = sizes.begin();
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| SizesType::const_iterator sizeEnd = sizes.end();
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| | |
| std::cout << "Number of pixels per class " << std::endl;
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| unsigned int kclass = 0;
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| while( sizeItr != sizeEnd )
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| {
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| std::cout << "Class " << kclass << " = " << *sizeItr << std::endl;
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| ++kclass;
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| ++sizeItr;
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| }
| |
| | |
| // Visualize
| |
| 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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| #if VTK_MAJOR_VERSION <= 5
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| originalActor->SetInput(originalConnector->GetOutput());
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| #else
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| originalConnector->Update();
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| originalActor->SetInputData(originalConnector->GetOutput());
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| #endif
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| | |
| ConnectorType::Pointer outputConnector = ConnectorType::New();
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| outputConnector->SetInput(rescaleFilter->GetOutput());
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| | |
| vtkSmartPointer<vtkImageActor> outputActor =
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| vtkSmartPointer<vtkImageActor>::New();
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| #if VTK_MAJOR_VERSION <= 5
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| outputActor->SetInput(outputConnector->GetOutput());
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| #else
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| outputConnector->Update();
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| outputActor->SetInputData(outputConnector->GetOutput());
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| #endif
| |
| | |
| // 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);
| |
| | |
| // 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};
| |
| | |
| // Setup both renderers
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| vtkSmartPointer<vtkRenderer> leftRenderer =
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| vtkSmartPointer<vtkRenderer>::New();
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| renderWindow->AddRenderer(leftRenderer); | |
| 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(outputActor);
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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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|
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| return EXIT_SUCCESS;
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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(10);
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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|ScalarImageKmeansImageFilter|}}
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