correspondence_rejection_median_distance.cpp

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#include <pcl/registration/correspondence_rejection_median_distance.h>

void
pcl::registration::CorrespondenceRejectorMedianDistance::getRemainingCorrespondences (
    const pcl::Correspondences& original_correspondences,
    pcl::Correspondences& remaining_correspondences)
{
  std::vector <double> dists;
  dists.resize (original_correspondences.size ());

  for (size_t i = 0; i < original_correspondences.size (); ++i)
  {
    if (data_container_)
      dists[i] = data_container_->getCorrespondenceScore (original_correspondences[i]);
    else
      dists[i] = original_correspondences[i].distance;
  }

  std::vector <double> nth (dists);
  nth_element (nth.begin (), nth.begin () + (nth.size () / 2), nth.end ());
  median_distance_ = nth [nth.size () / 2];

  unsigned int number_valid_correspondences = 0;
  remaining_correspondences.resize (original_correspondences.size ());

  for (size_t i = 0; i < original_correspondences.size (); ++i)
    if (dists[i] <= median_distance_ * factor_)
      remaining_correspondences[number_valid_correspondences++] = original_correspondences[i];
  remaining_correspondences.resize (number_valid_correspondences);
}