SphinxExamples/src/Filtering/DistanceMap/MeanDistanceBetweenAllPointsOnTwoCurves/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 "itkContourMeanDistanceImageFilter.h"
 
#ifdef ENABLE_QUICKVIEW
#  include "QuickView.h"
#endif
 
template <typename TImage>
static void
CreateImage1(TImage * const);
 
template <typename TImage>
static void
CreateImage2(TImage * const);
 
int
main()
{
  using ImageType = itk::Image<unsigned char, 2>;
 
  auto image1 = ImageType::New();
  CreateImage1(image1.GetPointer());
 
  auto image2 = ImageType::New();
  CreateImage2(image2.GetPointer());
 
  using ContourMeanDistanceImageFilterType = itk::ContourMeanDistanceImageFilter<ImageType, ImageType>;
 
  ContourMeanDistanceImageFilterType::Pointer contourMeanDistanceImageFilter =
    ContourMeanDistanceImageFilterType::New();
  contourMeanDistanceImageFilter->SetInput1(image1);
  contourMeanDistanceImageFilter->SetInput2(image2);
  contourMeanDistanceImageFilter->Update();
 
  std::cout << "Mean distance: " << contourMeanDistanceImageFilter->GetMeanDistance() << std::endl;
 
#ifdef ENABLE_QUICKVIEW
  QuickView viewer;
  viewer.AddImage(image1.GetPointer());
  viewer.AddImage(image2.GetPointer());
  viewer.Visualize();
#endif
  return EXIT_SUCCESS;
}
 
template <typename TImage>
void
CreateImage1(TImage * const image)
{
  // Create an image bigger than the input image and that has dimensions which are powers of two
  typename TImage::IndexType start = { { 0, 0 } };
 
  typename TImage::SizeType size = { { 20, 20 } };
 
  itk::ImageRegion<2> region(start, size);
 
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);
 
  // Create a diagonal white line through the image
  for (typename TImage::IndexValueType i = 0; i < 20; ++i)
  {
    for (typename TImage::IndexValueType j = 0; j < 20; ++j)
    {
      if (i == j)
      {
        itk::Index<2> pixel = { { i, j } };
        image->SetPixel(pixel, 255);
      }
    }
  }
}
 
template <typename TImage>
void
CreateImage2(TImage * const image)
{
  typename TImage::IndexType start = { { 0, 0 } };
 
  typename TImage::SizeType size = { { 20, 20 } };
 
  itk::ImageRegion<2> region(start, size);
 
  image->SetRegions(region);
  image->Allocate();
  image->FillBuffer(0);
 
  // Create a vertical line of white pixels down the center of the image
  for (typename TImage::IndexValueType i = 0; i < 20; ++i)
  {
    for (typename TImage::IndexValueType j = 0; j < 20; ++j)
    {
      if (i == 10)
      {
        itk::Index<2> pixel = { { i, j } };
        image->SetPixel(pixel, 255);
      }
    }
  }
}