SphinxExamples/src/Filtering/Smoothing/MedianFilteringOfAnRGBImage/Code.cxx

/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#include "itkMedianImageFilter.h"

#include "itkRGBPixel.h"
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"

namespace itk
{
template< typename TComponent = unsigned short >
class myRGBPixel : public RGBPixel<TComponent>
{
public:
  using Self = myRGBPixel;
  using Superclass = RGBPixel<TComponent>;

  using RGBPixel<TComponent>::operator=;

  bool operator<=(const Self & r) const
    {
    return (this->GetLuminance() <= r.GetLuminance());
    }
  bool operator<(const Self & r) const
    {
    return (this->GetLuminance() < r.GetLuminance());
    }
};
}

int main(int argc, char * argv[])
{
  // Verify command line arguments
  if( argc != 4 )
    {
    std::cerr << "Usage: " << std::endl;
    std::cerr << argv[0] << " <InputImageFile> <OutputImageFile> <radius>"
              << std::endl;
    return EXIT_FAILURE;
    }

  // Setup types
  constexpr unsigned int Dimension = 2;

  using MyPixelType = itk::myRGBPixel< unsigned char >;
  using MyImageType = itk::Image< MyPixelType, Dimension >;

  // Create and setup a reader
  using ReaderType = itk::ImageFileReader< MyImageType >;
  ReaderType::Pointer reader = ReaderType::New();
  reader->SetFileName( argv[1] );

  // Create and setup a median filter
  using FilterType = itk::MedianImageFilter< MyImageType, MyImageType >;
  FilterType::Pointer medianFilter = FilterType::New();

  FilterType::InputSizeType radius;
  radius.Fill( atoi( argv[3] ) );

  medianFilter->SetRadius( radius );
  medianFilter->SetInput( reader->GetOutput() );

  // Cast the custom myRBGPixel's to RGBPixel's
  using RGBPixelType = itk::RGBPixel< unsigned char >;
  using RGBImageType = itk::Image< RGBPixelType, Dimension >;
  using CastType = itk::CastImageFilter< MyImageType, RGBImageType >;
  CastType::Pointer cast = CastType::New();
  cast->SetInput( medianFilter->GetOutput() );

  using WriterType = itk::ImageFileWriter< RGBImageType >;
  WriterType::Pointer writer = WriterType::New();
  writer->SetInput( cast->GetOutput() );
  writer->SetFileName( argv[2] );

  try
    {
    writer->Update();
    }
  catch( itk::ExceptionObject & error )
    {
    std::cerr << "Error: " << error << std::endl;
    return EXIT_FAILURE;
    }

  return EXIT_SUCCESS;
}