ITK/Examples/Smoothing/MedianImageFilter

Replace every pixel in an image with the median of its neighbors.

MedianImageFilter.cxx

<source lang="cpp">

1. include "itkImage.h"
2. include "itkImageFileReader.h"
3. include "itkMedianImageFilter.h"
4. include "itkSubtractImageFilter.h"

1. include "itksys/SystemTools.hxx"

1. include <sstream>

1. include "QuickView.h"

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;
   }
 unsigned int radius = 2;
 if (argc > 2)
   {
   radius = atoi(argv[2]);
   }

 std::string inputFilename = argv[1];

 // Setup types
 typedef itk::Image<float, 2 >                         ImageType;
 typedef itk::ImageFileReader<ImageType>               ReaderType;
 typedef itk::MedianImageFilter<ImageType, ImageType > FilterType;
 typedef itk::SubtractImageFilter<ImageType>           SubtractType;

 // 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::SizeType kernelRadius;
 kernelRadius.Fill(radius);
 medianFilter->SetRadius(radius);
 medianFilter->SetInput( reader->GetOutput() );

 SubtractType::Pointer diff = SubtractType::New();
 diff->SetInput1(reader->GetOutput());
 diff->SetInput2(medianFilter->GetOutput());

 QuickView viewer;
 viewer.AddImage(
   reader->GetOutput(),true,
   itksys::SystemTools::GetFilenameName(inputFilename));  

 std::stringstream desc;
 desc << "MedianImageFilter, radius = " << radius;
 viewer.AddImage(
   medianFilter->GetOutput(),
   true,
   desc.str());  

 std::stringstream desc2;
 desc2 << "Original - Median";
 viewer.AddImage(
   diff->GetOutput(),
   true,
   desc2.str());  

 viewer.Visualize();

 return EXIT_SUCCESS;

} </source>

CMakeLists.txt

<source lang="cmake"> cmake_minimum_required(VERSION 2.6)

PROJECT(MedianImageFilter)

include_directories(/home/doriad/src/ITK/Wrapping/WrapITK/ExternalProjects/ItkVtkGlue/src/)

FIND_PACKAGE(VTK REQUIRED) INCLUDE(${VTK_USE_FILE})

FIND_PACKAGE(ITK REQUIRED) INCLUDE(${ITK_USE_FILE})

ADD_EXECUTABLE(MedianImageFilter MedianImageFilter.cxx) TARGET_LINK_LIBRARIES(MedianImageFilter vtkHybrid ITKBasicFilters ITKIO ITKCommon)

</source>