SphinxExamples/src/Core/Common/DisplayImage/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 "itkImageFileReader.h"
#include "itkRescaleIntensityImageFilter.h"
 
#ifdef ENABLE_QUICKVIEW
#  include "QuickView.h"
#endif
 
using ImageType = itk::Image<unsigned char, 2>;
 
static void
CreateImage(ImageType * const image);
 
int
main(int argc, char * argv[])
{
  ImageType::Pointer image;
 
  if (argc < 2)
  {
    // std::cerr << "Required: filename" << std::endl;
    // return EXIT_FAILURE;
    image = ImageType::New();
    CreateImage(image);
  }
  else
  {
    image = itk::ReadImage<ImageType>(argv[1]);
  }
 
  using RescaleFilterType = itk::RescaleIntensityImageFilter<ImageType, ImageType>;
  auto rescaleFilter = RescaleFilterType::New();
  rescaleFilter->SetInput(image);
  rescaleFilter->SetOutputMinimum(0);
  rescaleFilter->SetOutputMaximum(255);
  rescaleFilter->Update();
 
#ifdef ENABLE_QUICKVIEW
  QuickView viewer;
  viewer.AddImage(image.GetPointer());
  viewer.AddImage(rescaleFilter->GetOutput());
  viewer.Visualize();
#endif
 
  return EXIT_SUCCESS;
}
 
void
CreateImage(ImageType * const image)
{
  // Create an image with 2 connected components
  ImageType::IndexType corner = { { 0, 0 } };
 
  ImageType::SizeType size;
  unsigned int        NumRows = 200;
  unsigned int        NumCols = 300;
  size[0] = NumRows;
  size[1] = NumCols;
 
  ImageType::RegionType region(corner, size);
 
  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, 15);
    }
  }
}