Difference between revisions of "ITK/Examples/ImageProcessing/ConnectedComponentImageFilter"

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<div class="floatcenter">[[File:ITK_Examples_Baseline_ImageProcessing_TestConnectedComponentImageFilter.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{{warning|1=The media wiki content on this page is no longer maintained.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 releasesIn many cases, the examples on this page no longer conform to the best practices for modern ITK versions.}}
==ConnectedComponentImageFilter.cxx==
<source lang="cpp">
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkConnectedComponentImageFilter.h"
#include "itkRescaleIntensityImageFilter.h"
 
#include "QuickView.h"
template <typename TImage>
static void CreateImage(TImage* const image);
 
int main( int argc, char *argv[])
{
  typedef itk::Image<unsigned char, 2>  ImageType;
 
  ImageType::Pointer image;
 
  if(argc < 2)
    {
    image = ImageType::New();
    CreateImage(image.GetPointer());
    }
  else
    {
    std::string fileName = argv[1];
    typedef itk::ImageFileReader<ImageType> ReaderType;
    ReaderType::Pointer reader = ReaderType::New();
    reader->SetFileName(fileName);
    reader->Update();
 
    image = reader->GetOutput();
    }
 
  typedef itk::ConnectedComponentImageFilter <ImageType, ImageType >
    ConnectedComponentImageFilterType;
 
  ConnectedComponentImageFilterType::Pointer labelFilter
    = ConnectedComponentImageFilterType::New ();
  labelFilter->SetInput(image);
  labelFilter->Update();
 
  typedef itk::RescaleIntensityImageFilter< ImageType, ImageType > RescaleFilterType;
  RescaleFilterType::Pointer rescaleFilter = RescaleFilterType::New();
  rescaleFilter->SetOutputMinimum(0);
  rescaleFilter->SetOutputMaximum(255);
  rescaleFilter->SetInput(labelFilter->GetOutput());
 
  QuickView viewer;
  viewer.AddImage<ImageType>( image, false );  
  viewer.AddImage<ImageType>( rescaleFilter->GetOutput(), false ); 
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}
 
template <typename TImage>
void CreateImage(TImage* const image)
{
  // Create an image with 2 connected components
  typename TImage::IndexType start = {{0,0}};
  start[0] = 0;
  start[1] = 0;
 
  typename TImage::SizeType size;
  unsigned int NumRows = 200;
   unsigned int NumCols = 300;
  size[0] = NumRows;
  size[1] = NumCols;
 
  typename TImage::RegionType region(start, size);
 
  image->SetRegions(region);
  image->Allocate();
 
  // Make a square
  for(typename TImage::IndexValueType r = 20; r < 80; r++)
    {
    for(typename TImage::IndexValueType c = 30; c < 100; c++)
      {
      typename TImage::IndexType pixelIndex = {{r,c}};
 
      image->SetPixel(pixelIndex, 255);
      }
    }
 
  // Make another square
  for(typename TImage::IndexValueType r = 100; r < 130; r++)
    {
    for(typename TImage::IndexValueType c = 115; c < 160; c++)
      {
      typename TImage::IndexType pixelIndex = {{r,c}};
 
      image->SetPixel(pixelIndex, 255);
      }
    }
}
</source>
 
{{ITKVTKCMakeLists|{{SUBPAGENAME}}}}

Latest revision as of 10:42, 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.