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| ==ExtractLargestConnectedComponentFromBinaryImage.cxx==
| | {{warning|1=The media wiki content on this page is no longer maintained.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.}} |
| <source lang="cpp">
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| #include "itkImage.h"
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| #include "itkImageFileReader.h"
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| #include "itkConnectedComponentImageFilter.h"
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| #include "itkLabelShapeKeepNObjectsImageFilter.h"
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| #include "itkRescaleIntensityImageFilter.h"
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| | |
| #include "itksys/SystemTools.hxx"
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| #include <sstream>
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| | |
| #include "QuickView.h"
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| | |
| int main( int argc, char *argv[])
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| { | |
| if( argc < 2 )
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| {
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| std::cout << "Usage:" << std::endl;
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| std::cout << argv[0] << " InputFileName" << std::endl;
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| }
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| const unsigned int Dimension = 2;
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| typedef unsigned char PixelType;
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| typedef itk::Image< PixelType, Dimension > 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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| | |
| typedef itk::Image< unsigned short, Dimension > OutputImageType;
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| | |
| typedef itk::ConnectedComponentImageFilter <ImageType, OutputImageType >
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| ConnectedComponentImageFilterType;
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| | |
| ConnectedComponentImageFilterType::Pointer connected = ConnectedComponentImageFilterType::New ();
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| connected->SetInput(reader->GetOutput());
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| connected->Update();
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| | |
| std::cout << "Number of objects: " << connected->GetObjectCount() << std::endl;
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| | |
| typedef itk::LabelShapeKeepNObjectsImageFilter< OutputImageType > LabelShapeKeepNObjectsImageFilterType;
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| LabelShapeKeepNObjectsImageFilterType::Pointer labelShapeKeepNObjectsImageFilter = LabelShapeKeepNObjectsImageFilterType::New();
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| labelShapeKeepNObjectsImageFilter->SetInput( connected->GetOutput() );
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| labelShapeKeepNObjectsImageFilter->SetBackgroundValue( 0 );
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| labelShapeKeepNObjectsImageFilter->SetNumberOfObjects( 1 );
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| labelShapeKeepNObjectsImageFilter->SetAttribute( LabelShapeKeepNObjectsImageFilterType::LabelObjectType::NUMBER_OF_PIXELS);
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| | |
| typedef itk::RescaleIntensityImageFilter< OutputImageType, ImageType > RescaleFilterType;
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| RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
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| rescaleFilter->SetOutputMinimum(0);
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| rescaleFilter->SetOutputMaximum(itk::NumericTraits<PixelType>::max());
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| rescaleFilter->SetInput(labelShapeKeepNObjectsImageFilter->GetOutput());
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| QuickView viewer;
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| viewer.AddImage(
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| reader->GetOutput(),true,
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| itksys::SystemTools::GetFilenameName(argv[1]));
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| std::stringstream desc;
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| desc << "Largest object of " << connected->GetObjectCount() << " objects";
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| viewer.AddImage(
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| rescaleFilter->GetOutput(),
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| true,
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| desc.str());
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| viewer.Visualize(); | |
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| return EXIT_SUCCESS;
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| }
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| </source>
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| | |
| {{ITKCMakeLists|{{SUBPAGENAME}}}}
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