SphinxExamples/src/Filtering/ImageIntensity/InvertImage/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 "itkInvertIntensityImageFilter.h"
#include "itkImageFileReader.h"
 
#ifdef ENABLE_QUICKVIEW
#  include "QuickView.h"
#endif
 
using ImageType = itk::Image<unsigned char, 2>;
 
static void
CreateImage(ImageType::Pointer image);
 
int
main(int argc, char * argv[])
{
  auto              image = ImageType::New();
  std::stringstream desc;
 
  CreateImage(image);
 
  unsigned int maximum = 255;
  if (argc > 1)
  {
    image = itk::ReadImage<ImageType>(argv[1]);
    desc << itksys::SystemTools::GetFilenameName(argv[1]);
    if (argc > 2)
    {
      maximum = std::stoi(argv[2]);
    }
  }
  else
  {
    CreateImage(image);
    desc << "Synthetic image";
    maximum = 50;
  }
 
  using InvertIntensityImageFilterType = itk::InvertIntensityImageFilter<ImageType>;
 
  auto invertIntensityFilter = InvertIntensityImageFilterType::New();
  invertIntensityFilter->SetInput(image);
  invertIntensityFilter->SetMaximum(maximum);
 
#ifdef ENABLE_QUICKVIEW
  QuickView viewer;
  viewer.AddImage(image.GetPointer(), true, desc.str());
 
  std::stringstream desc2;
  desc2 << "InvertIntensity, maximum = " << maximum;
  viewer.AddImage(invertIntensityFilter->GetOutput(), true, desc2.str());
 
  viewer.Visualize();
#endif
  return EXIT_SUCCESS;
}
 
void
CreateImage(ImageType::Pointer image)
{
  // Create an image
  ImageType::RegionType region;
  ImageType::IndexType  start;
  start[0] = 0;
  start[1] = 0;
 
  ImageType::SizeType size;
  unsigned int        NumRows = 200;
  unsigned int        NumCols = 300;
  size[0] = NumRows;
  size[1] = NumCols;
 
  region.SetSize(size);
  region.SetIndex(start);
 
  image->SetRegions(region);
  image->Allocate();
 
  // Make a square
  for (unsigned int r = 40; r < 100; ++r)
  {
    for (unsigned int c = 40; c < 100; ++c)
    {
      ImageType::IndexType pixelIndex;
      pixelIndex[0] = r;
      pixelIndex[1] = c;
 
      image->SetPixel(pixelIndex, 50);
    }
  }
}