ITK/Examples/ImageSegmentation/ExtractLargestConnectedComponentFromBinaryImage: Difference between revisions

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{{warning|1=The media wiki content on this page is no longer maintained.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

Latest revision as of 16:25, 7 June 2019

Warning: 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.