pfhrgb.hpp

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 *  $Id: pfhrgb.hpp 5026 2012-03-12 02:51:44Z rusu $
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#ifndef PCL_FEATURES_IMPL_PFHRGB_H_
#define PCL_FEATURES_IMPL_PFHRGB_H_

#include <pcl/features/pfhrgb.h>

template <typename PointInT, typename PointNT, typename PointOutT> bool
pcl::PFHRGBEstimation<PointInT, PointNT, PointOutT>::computeRGBPairFeatures (
    const pcl::PointCloud<PointInT> &cloud, const pcl::PointCloud<PointNT> &normals,
    int p_idx, int q_idx,
    float &f1, float &f2, float &f3, float &f4, float &f5, float &f6, float &f7)
{
  Eigen::Vector4i colors1 (cloud.points[p_idx].r, cloud.points[p_idx].g, cloud.points[p_idx].b, 0),
      colors2 (cloud.points[q_idx].r, cloud.points[q_idx].g, cloud.points[q_idx].b, 0);
  pcl::computeRGBPairFeatures (cloud.points[p_idx].getVector4fMap (), normals.points[p_idx].getNormalVector4fMap (),
                               colors1,
                               cloud.points[q_idx].getVector4fMap (), normals.points[q_idx].getNormalVector4fMap (),
                               colors2,
                               f1, f2, f3, f4, f5, f6, f7);
  return (true);
}

template <typename PointInT, typename PointNT, typename PointOutT> void
pcl::PFHRGBEstimation<PointInT, PointNT, PointOutT>::computePointPFHRGBSignature (
    const pcl::PointCloud<PointInT> &cloud, const pcl::PointCloud<PointNT> &normals,
    const std::vector<int> &indices, int nr_split, Eigen::VectorXf &pfhrgb_histogram)
{
  int h_index, h_p;

  // Clear the resultant point histogram
  pfhrgb_histogram.setZero ();

  // Factorization constant
  float hist_incr = 100.0f / static_cast<float> (indices.size () * indices.size () - 1);

  // Iterate over all the points in the neighborhood
  for (size_t i_idx = 0; i_idx < indices.size (); ++i_idx)
  {
    for (size_t j_idx = 0; j_idx < indices.size (); ++j_idx)
    {
      // Avoid unnecessary returns
      if (i_idx == j_idx)
        continue;

      // Compute the pair NNi to NNj
      if (!computeRGBPairFeatures (cloud, normals, indices[i_idx], indices[j_idx],
                                   pfhrgb_tuple_[0], pfhrgb_tuple_[1], pfhrgb_tuple_[2], pfhrgb_tuple_[3],
                                   pfhrgb_tuple_[4], pfhrgb_tuple_[5], pfhrgb_tuple_[6]))
        continue;

      // Normalize the f1, f2, f3, f5, f6, f7 features and push them in the histogram
      f_index_[0] = static_cast<int> (floor (nr_split * ((pfhrgb_tuple_[0] + M_PI) * d_pi_)));
      if (f_index_[0] < 0)         f_index_[0] = 0;
      if (f_index_[0] >= nr_split) f_index_[0] = nr_split - 1;

      f_index_[1] = static_cast<int> (floor (nr_split * ((pfhrgb_tuple_[1] + 1.0) * 0.5)));
      if (f_index_[1] < 0)         f_index_[1] = 0;
      if (f_index_[1] >= nr_split) f_index_[1] = nr_split - 1;

      f_index_[2] = static_cast<int> (floor (nr_split * ((pfhrgb_tuple_[2] + 1.0) * 0.5)));
      if (f_index_[2] < 0)         f_index_[2] = 0;
      if (f_index_[2] >= nr_split) f_index_[2] = nr_split - 1;

      // color ratios are in [-1, 1]
      f_index_[4] = static_cast<int> (floor (nr_split * ((pfhrgb_tuple_[4] + 1.0) * 0.5)));
      if (f_index_[4] < 0)         f_index_[4] = 0;
      if (f_index_[4] >= nr_split) f_index_[4] = nr_split - 1;

      f_index_[5] = static_cast<int> (floor (nr_split * ((pfhrgb_tuple_[5] + 1.0) * 0.5)));
      if (f_index_[5] < 0)         f_index_[5] = 0;
      if (f_index_[5] >= nr_split) f_index_[5] = nr_split - 1;

      f_index_[6] = static_cast<int> (floor (nr_split * ((pfhrgb_tuple_[6] + 1.0) * 0.5)));
      if (f_index_[6] < 0)         f_index_[6] = 0;
      if (f_index_[6] >= nr_split) f_index_[6] = nr_split - 1;


      // Copy into the histogram
      h_index = 0;
      h_p     = 1;
      for (int d = 0; d < 3; ++d)
      {
        h_index += h_p * f_index_[d];
        h_p     *= nr_split;
      }
      pfhrgb_histogram[h_index] += hist_incr;

      // and the colors
      h_index = 125;
      h_p     = 1;
      for (int d = 4; d < 7; ++d)
      {
        h_index += h_p * f_index_[d];
        h_p     *= nr_split;
      }
      pfhrgb_histogram[h_index] += hist_incr;
    }
  }
}

template <typename PointInT, typename PointNT, typename PointOutT> void
pcl::PFHRGBEstimation<PointInT, PointNT, PointOutT>::computeFeature (PointCloudOut &output)
{
  pfhrgb_histogram_.setZero (2 * nr_subdiv_ * nr_subdiv_ * nr_subdiv_);
  pfhrgb_tuple_.setZero (7);

  // Allocate enough space to hold the results
  // \note This resize is irrelevant for a radiusSearch ().
  std::vector<int> nn_indices (k_);
  std::vector<float> nn_dists (k_);

  // Iterating over the entire index vector
  for (size_t idx = 0; idx < indices_->size (); ++idx)
  {
    this->searchForNeighbors ((*indices_)[idx], search_parameter_, nn_indices, nn_dists);

    // Estimate the PFH signature at each patch
    computePointPFHRGBSignature (*surface_, *normals_, nn_indices, nr_subdiv_, pfhrgb_histogram_);

    // Copy into the resultant cloud
    for (int d = 0; d < pfhrgb_histogram_.size (); ++d) {
      output.points[idx].histogram[d] = pfhrgb_histogram_[d];
//      PCL_INFO ("%f ", pfhrgb_histogram_[d]);
    }
//    PCL_INFO ("\n");
  }
}

#define PCL_INSTANTIATE_PFHRGBEstimation(T,NT,OutT) template class PCL_EXPORTS pcl::PFHRGBEstimation<T,NT,OutT>;

#endif /* PCL_FEATURES_IMPL_PFHRGB_H_ */