SphinxExamples/src/Filtering/ImageIntensity/MaskImage/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 "itkConfigure.h"
 
#include "itkImage.h"
#include "itkImageFileReader.h"
#include "itkMaskImageFilter.h"
#include "itkImageRegionIterator.h"
#ifdef ENABLE_QUICKVIEW
#  include "QuickView.h"
#endif
 
using ImageType = itk::Image<unsigned char, 2>;
 
void
CreateHalfMask(ImageType::Pointer image, ImageType::Pointer & mask);
 
int
main(int argc, char * argv[])
{
  if (argc < 2)
  {
    std::cerr << "Usage: " << argv[0] << " filename" << std::endl;
    return EXIT_FAILURE;
  }
 
  const auto input = itk::ReadImage<ImageType>(argv[1]);
 
  auto mask = ImageType::New();
  CreateHalfMask(input, mask);
 
  using MaskFilterType = itk::MaskImageFilter<ImageType, ImageType>;
  auto maskFilter = MaskFilterType::New();
  maskFilter->SetInput(input);
  maskFilter->SetMaskImage(mask);
  mask->Print(std::cout);
#ifdef ENABLE_QUICKVIEW
  QuickView viewer;
  viewer.AddImage(input.GetPointer(), true, itksys::SystemTools::GetFilenameName(argv[1]));
 
  std::stringstream desc;
  desc << "Mask";
  viewer.AddImage(mask.GetPointer(), true, desc.str());
 
  std::stringstream desc2;
  desc2 << "MaskFilter";
  viewer.AddImage(maskFilter->GetOutput(), true, desc2.str());
 
  viewer.Visualize();
#endif
  return EXIT_SUCCESS;
}
 
 
void
CreateHalfMask(ImageType::Pointer image, ImageType::Pointer & mask)
{
  ImageType::RegionType region = image->GetLargestPossibleRegion();
 
  mask->SetRegions(region);
  mask->Allocate();
 
  ImageType::SizeType regionSize = region.GetSize();
 
  itk::ImageRegionIterator<ImageType> imageIterator(mask, region);
 
  // Make the left half of the mask white and the right half black
  while (!imageIterator.IsAtEnd())
  {
    if (imageIterator.GetIndex()[0] > static_cast<ImageType::IndexValueType>(regionSize[0]) / 2)
    {
      imageIterator.Set(0);
    }
    else
    {
      imageIterator.Set(255);
    }
 
    ++imageIterator;
  }
}