ITK/Examples/Smoothing/RGBMedianImageFilter: Difference between revisions

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<div class="floatcenter">[[File:ITK_Examples_Baseline_Smoothing_TestRGBMedianImageFilter.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{{warning|1=The media wiki content on this page is no longer maintained.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.
This examples creates a subclass of RGBPixel that overrides the operator <= and < method. The operator compares luminances of pixels.
}}
==RGBMedianImageFilter.cxx==
<source lang="cpp">
#include "itkMedianImageFilter.h"


#include "itkImage.h"
[https://itk.org/ITKExamples[ITK Sphinx Examples]]
#include "itkImageFileReader.h"
#include "itkSubtractImageFilter.h"
#include "itkRGBPixel.h"
#include "itkCastImageFilter.h"
 
#include "itksys/SystemTools.hxx"
 
#include <sstream>
 
#include "QuickView.h"
 
namespace itk
{
/** \class myRGBPixel
* \brief Extends RGBPixel with operator <=
*
* This class overrides the <= and < operators to use Luminance as a sorting value.
*/
template< typename TComponent = unsigned short >
class myRGBPixel : public RGBPixel<TComponent>
{
public:
  typedef myRGBPixel          Self;
  typedef RGBPixel<TComponent> Superclass;
  using RGBPixel<TComponent>::operator=;
 
  bool operator<=(const Self & r) const
  {
    if (this->GetLuminance() <= r.GetLuminance())
      {
      return true;
      }
    else
      {
      return false;
      }
  }
  bool operator<(const Self & r) const
  {
    if (this->GetLuminance() < r.GetLuminance())
      {
      return true;
      }
    else
      {
      return false;
      }
  }
};
}
 
int main(int argc, char * argv[])
{
  // Verify command line arguments
  if( argc < 2 )
    {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << " InputImageFile [radius]" << std::endl;
    return EXIT_FAILURE;
    }
  std::string inputFilename = argv[1];
 
  // Setup types
  typedef itk::myRGBPixel<unsigned char>                      PixelType;
  typedef itk::Image<PixelType, 2 >                          ImageType;
  typedef itk::RGBPixel<unsigned char>                        RGBPixelType;
  typedef itk::Image<RGBPixelType, 2 >                        RGBImageType;
 
  typedef itk::ImageFileReader<ImageType>                    ReaderType;
  typedef itk::MedianImageFilter<ImageType, ImageType >      FilterType;
  typedef itk::CastImageFilter<ImageType, RGBImageType>      CastType;
 
  // Create and setup a reader
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName( inputFilename );
 
  // Create and setup a median filter
  FilterType::Pointer medianFilter = FilterType::New();
  FilterType::InputSizeType radius;
  radius.Fill(2);
  if (argc > 2)
    {
    radius.Fill(atoi(argv[2]));
    }
 
  medianFilter->SetRadius(radius);
  medianFilter->SetInput(reader->GetOutput());
 
  // Cast the custom myRBGPixel's to RGBPixel's
  CastType::Pointer castReader = CastType::New();
  castReader->SetInput(reader->GetOutput());
 
  CastType::Pointer castMedian = CastType::New();
  castMedian->SetInput(medianFilter->GetOutput());
 
  QuickView viewer;
  viewer.AddRGBImage(
    castReader->GetOutput(),
    true,
    itksys::SystemTools::GetFilenameName(inputFilename)); 
 
  std::stringstream desc;
  desc << "MedianImageFilter, radius = " << radius;
  viewer.AddRGBImage(
    castMedian->GetOutput(),
    true,
    desc.str()); 
 
  viewer.Visualize();
 
  return EXIT_SUCCESS;
}
</source>
{{ITKVTKCMakeLists|RGBMedianImageFilter|}}

Latest revision as of 16:24, 31 May 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.

[ITK Sphinx Examples]