SphinxExamples/src/Filtering/BinaryMathematicalMorphology/PruneBinaryImage/Code.cxx

/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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 "itkImage.h"
#include "itkBinaryPruningImageFilter.h"
#include "itkImageFileReader.h"
#include "itkImageFileWriter.h"
#include "itkBinaryBallStructuringElement.h"
 
#ifdef ENABLE_QUICKVIEW
#  include "QuickView.h"
#endif
 
template <typename TImage>
void
CreateImage(TImage * const image);
 
int
main(int argc, char * argv[])
{
  //   std::cerr << "Usage: " << std::endl;
  //   std::cerr << argv[0] << " InputImageFile OutputImageFile [iteration]" << std::endl;
 
  using ImageType = itk::Image<unsigned char, 2>;
  ImageType::Pointer image;
  std::string        outputFilename = "Output.png";
  unsigned int       iteration = 1;
 
  if (argc >= 4)
  {
    image = itk::ReadImage<ImageType>(argv[1]);
 
    std::stringstream ssIteration(argv[2]);
    ssIteration >> iteration;
 
    outputFilename = argv[3];
  }
  else
  {
    image = ImageType::New();
    CreateImage(image.GetPointer());
  }
 
  std::cout << "Iterations: " << iteration << std::endl;
 
  using BinaryPruningImageFilterType = itk::BinaryPruningImageFilter<ImageType, ImageType>;
  auto pruneFilter = BinaryPruningImageFilterType::New();
  pruneFilter->SetInput(image);
  pruneFilter->SetIteration(iteration);
  pruneFilter->GetOutput();
 
#ifdef ENABLE_QUICKVIEW
  QuickView viewer;
  viewer.AddImage(image.GetPointer());
  viewer.AddImage(pruneFilter->GetOutput());
  viewer.Visualize();
#endif
 
  itk::WriteImage(pruneFilter->GetOutput(), outputFilename);
 
  return EXIT_SUCCESS;
}
 
template <typename TImage>
void
CreateImage(TImage * const image)
{
  // This function creates a 2D image consisting of a black background,
  // a large square of a non-zero pixel value, and a single "erroneous" pixel
  // near the square.
  typename TImage::IndexType corner = { { 0, 0 } };
 
  typename TImage::SizeType size = { { 200, 200 } };
 
  typename TImage::RegionType region(corner, size);
 
  image->SetRegions(region);
  image->Allocate(true);
 
  // Make a square
  for (int r = 40; r < 100; ++r)
  {
    for (int c = 40; c < 100; ++c)
    {
      typename TImage::IndexType pixelIndex = { { r, c } };
      image->SetPixel(pixelIndex, 50);
    }
  }
 
  typename TImage::IndexType pixelIndex = { { 102, 102 } };
 
  image->SetPixel(pixelIndex, 50);
}