cvfh.hpp

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#ifndef PCL_FEATURES_IMPL_CVFH_H_
#define PCL_FEATURES_IMPL_CVFH_H_
 
#include <pcl/features/cvfh.h>
#include <pcl/features/normal_3d.h>
#include <pcl/common/centroid.h>
 
//////////////////////////////////////////////////////////////////////////////////////////////
template<typename PointInT, typename PointNT, typename PointOutT> void
pcl::CVFHEstimation<PointInT, PointNT, PointOutT>::compute (PointCloudOut &output)
{
  if (!Feature<PointInT, PointOutT>::initCompute ())
  {
    output.width = output.height = 0;
    output.clear ();
    return;
  }
  // Resize the output dataset
  // Important! We should only allocate precisely how many elements we will need, otherwise
  // we risk at pre-allocating too much memory which could lead to bad_alloc 
  // (see http://dev.pointclouds.org/issues/657)
  output.width = output.height = 1;
  output.resize (1);
 
  // Perform the actual feature computation
  computeFeature (output);
 
  Feature<PointInT, PointOutT>::deinitCompute ();
}
 
//////////////////////////////////////////////////////////////////////////////////////////////
template<typename PointInT, typename PointNT, typename PointOutT> void
pcl::CVFHEstimation<PointInT, PointNT, PointOutT>::extractEuclideanClustersSmooth (
    const pcl::PointCloud<pcl::PointNormal> &cloud,
    const pcl::PointCloud<pcl::PointNormal> &normals,
    float tolerance,
    const pcl::search::Search<pcl::PointNormal>::Ptr &tree,
    std::vector<pcl::PointIndices> &clusters,
    double eps_angle,
    unsigned int min_pts_per_cluster,
    unsigned int max_pts_per_cluster)
{
  if (tree->getInputCloud ()->size () != cloud.size ())
  {
    PCL_ERROR("[pcl::extractEuclideanClusters] Tree built for a different point cloud "
              "dataset (%zu) than the input cloud (%zu)!\n",
              static_cast<std::size_t>(tree->getInputCloud()->size()),
              static_cast<std::size_t>(cloud.size()));
    return;
  }
  if (cloud.size () != normals.size ())
  {
    PCL_ERROR("[pcl::extractEuclideanClusters] Number of points in the input point "
              "cloud (%zu) different than normals (%zu)!\n",
              static_cast<std::size_t>(cloud.size()),
              static_cast<std::size_t>(normals.size()));
    return;
  }
 
  // Create a bool vector of processed point indices, and initialize it to false
  std::vector<bool> processed (cloud.size (), false);
 
  pcl::Indices nn_indices;
  std::vector<float> nn_distances;
  // Process all points in the indices vector
  for (std::size_t i = 0; i < cloud.size (); ++i)
  {
    if (processed[i])
      continue;
    processed[i] = true;
 
    pcl::PointIndices r;
    r.header = cloud.header;
    auto& seed_queue = r.indices;
 
    seed_queue.push_back (i);
 
    // loop has an emplace_back, making it difficult to use modern loops
    for (std::size_t idx = 0; idx != seed_queue.size (); ++idx)
    {
      // Search for seed_queue[index]
      if (!tree->radiusSearch (seed_queue[idx], tolerance, nn_indices, nn_distances))
      {
        continue;
      }
 
      // skip index 0, since nn_indices[0] == idx, worth it?
      for (std::size_t j = 1; j < nn_indices.size (); ++j)
      {
        if (processed[nn_indices[j]]) // Has this point been processed before ?
          continue;
 
        //processed[nn_indices[j]] = true;
        // [-1;1]
        const double dot_p = normals[seed_queue[idx]].getNormalVector3fMap().dot(
                        normals[nn_indices[j]].getNormalVector3fMap());
 
        if (std::acos (dot_p) < eps_angle)
        {
          processed[nn_indices[j]] = true;
          seed_queue.emplace_back (nn_indices[j]);
        }
      }
    }
 
    // If this queue is satisfactory, add to the clusters
    if (seed_queue.size () >= min_pts_per_cluster && seed_queue.size () <= max_pts_per_cluster)
    {
      std::sort (r.indices.begin (), r.indices.end ());
      r.indices.erase (std::unique (r.indices.begin (), r.indices.end ()), r.indices.end ());
 
      // Might be better to work directly in the cluster somehow
      clusters.emplace_back (std::move(r)); // Trying to avoid a copy by moving
    }
  }
}
 
//////////////////////////////////////////////////////////////////////////////////////////////
template<typename PointInT, typename PointNT, typename PointOutT> void
pcl::CVFHEstimation<PointInT, PointNT, PointOutT>::filterNormalsWithHighCurvature (
    const pcl::PointCloud<PointNT> & cloud,
    pcl::Indices &indices_to_use,
    pcl::Indices &indices_out,
    pcl::Indices &indices_in,
    float threshold)
{
  indices_out.resize (cloud.size ());
  indices_in.resize (cloud.size ());
 
  std::size_t in, out;
  in = out = 0;
 
  for (const auto &index : indices_to_use)
  {
    if (cloud[index].curvature > threshold)
    {
      indices_out[out] = index;
      out++;
    }
    else
    {
      indices_in[in] = index;
      in++;
    }
  }
 
  indices_out.resize (out);
  indices_in.resize (in);
}
 
//////////////////////////////////////////////////////////////////////////////////////////////
template<typename PointInT, typename PointNT, typename PointOutT> void
pcl::CVFHEstimation<PointInT, PointNT, PointOutT>::computeFeature (PointCloudOut &output)
{
  // Check if input was set
  if (!normals_)
  {
    PCL_ERROR ("[pcl::%s::computeFeature] No input dataset containing normals was given!\n", getClassName ().c_str ());
    output.width = output.height = 0;
    output.clear ();
    return;
  }
  if (normals_->size () != surface_->size ())
  {
    PCL_ERROR ("[pcl::%s::computeFeature] The number of points in the input dataset differs from the number of points in the dataset containing the normals!\n", getClassName ().c_str ());
    output.width = output.height = 0;
    output.clear ();
    return;
  }
 
  centroids_dominant_orientations_.clear ();
 
  // ---[ Step 0: remove normals with high curvature
  pcl::Indices indices_out;
  pcl::Indices indices_in;
  filterNormalsWithHighCurvature (*normals_, *indices_, indices_out, indices_in, curv_threshold_);
 
  pcl::PointCloud<pcl::PointNormal>::Ptr normals_filtered_cloud (new pcl::PointCloud<pcl::PointNormal> ());
  normals_filtered_cloud->width = indices_in.size ();
  normals_filtered_cloud->height = 1;
  normals_filtered_cloud->points.resize (normals_filtered_cloud->width);
 
  for (std::size_t i = 0; i < indices_in.size (); ++i)
  {
    (*normals_filtered_cloud)[i].x = (*surface_)[indices_in[i]].x;
    (*normals_filtered_cloud)[i].y = (*surface_)[indices_in[i]].y;
    (*normals_filtered_cloud)[i].z = (*surface_)[indices_in[i]].z;
  }
 
  std::vector<pcl::PointIndices> clusters;
 
  if(normals_filtered_cloud->size() >= min_points_)
  {
    //recompute normals and use them for clustering
    KdTreePtr normals_tree_filtered (new pcl::search::KdTree<pcl::PointNormal> (false));
    normals_tree_filtered->setInputCloud (normals_filtered_cloud);
 
 
    pcl::NormalEstimation<PointNormal, PointNormal> n3d;
    n3d.setRadiusSearch (radius_normals_);
    n3d.setSearchMethod (normals_tree_filtered);
    n3d.setInputCloud (normals_filtered_cloud);
    n3d.compute (*normals_filtered_cloud);
 
    KdTreePtr normals_tree (new pcl::search::KdTree<pcl::PointNormal> (false));
    normals_tree->setInputCloud (normals_filtered_cloud);
 
    extractEuclideanClustersSmooth (*normals_filtered_cloud,
                                    *normals_filtered_cloud,
                                    cluster_tolerance_,
                                    normals_tree,
                                    clusters,
                                    eps_angle_threshold_,
                                    static_cast<unsigned int> (min_points_));
 
  }
 
  VFHEstimator vfh;
  vfh.setInputCloud (surface_);
  vfh.setInputNormals (normals_);
  vfh.setIndices(indices_);
  vfh.setSearchMethod (this->tree_);
  vfh.setUseGivenNormal (true);
  vfh.setUseGivenCentroid (true);
  vfh.setNormalizeBins (normalize_bins_);
  vfh.setNormalizeDistance (true);
  vfh.setFillSizeComponent (true);
  output.height = 1;
 
  // ---[ Step 1b : check if any dominant cluster was found
  if (!clusters.empty ())
  { // ---[ Step 1b.1 : If yes, compute CVFH using the cluster information
 
    for (const auto &cluster : clusters) //for each cluster
    {
      Eigen::Vector4f avg_normal = Eigen::Vector4f::Zero ();
      Eigen::Vector4f avg_centroid = Eigen::Vector4f::Zero ();
 
      for (const auto &index : cluster.indices)
      {
        avg_normal += (*normals_filtered_cloud)[index].getNormalVector4fMap ();
        avg_centroid += (*normals_filtered_cloud)[index].getVector4fMap ();
      }
 
      avg_normal /= static_cast<float> (cluster.indices.size ());
      avg_centroid /= static_cast<float> (cluster.indices.size ());
 
      Eigen::Vector4f centroid_test;
      pcl::compute3DCentroid (*normals_filtered_cloud, centroid_test);
      avg_normal.normalize ();
 
      Eigen::Vector3f avg_norm (avg_normal[0], avg_normal[1], avg_normal[2]);
      Eigen::Vector3f avg_dominant_centroid (avg_centroid[0], avg_centroid[1], avg_centroid[2]);
 
      //append normal and centroid for the clusters
      dominant_normals_.push_back (avg_norm);
      centroids_dominant_orientations_.push_back (avg_dominant_centroid);
    }
 
    //compute modified VFH for all dominant clusters and add them to the list!
    output.resize (dominant_normals_.size ());
    output.width = dominant_normals_.size ();
 
    for (std::size_t i = 0; i < dominant_normals_.size (); ++i)
    {
      //configure VFH computation for CVFH
      vfh.setNormalToUse (dominant_normals_[i]);
      vfh.setCentroidToUse (centroids_dominant_orientations_[i]);
      pcl::PointCloud<pcl::VFHSignature308> vfh_signature;
      vfh.compute (vfh_signature);
      output[i] = vfh_signature[0];
    }
  }
  else
  { // ---[ Step 1b.1 : If no, compute CVFH using all the object points
    Eigen::Vector4f avg_centroid;
    pcl::compute3DCentroid (*surface_, avg_centroid);
    Eigen::Vector3f cloud_centroid (avg_centroid[0], avg_centroid[1], avg_centroid[2]);
    centroids_dominant_orientations_.push_back (cloud_centroid);
 
    //configure VFH computation for CVFH using all object points
    vfh.setCentroidToUse (cloud_centroid);
    vfh.setUseGivenNormal (false);
 
    pcl::PointCloud<pcl::VFHSignature308> vfh_signature;
    vfh.compute (vfh_signature);
 
    output.resize (1);
    output.width = 1;
 
    output[0] = vfh_signature[0];
  }
}
 
#define PCL_INSTANTIATE_CVFHEstimation(T,NT,OutT) template class PCL_EXPORTS pcl::CVFHEstimation<T,NT,OutT>;
 
#endif    // PCL_FEATURES_IMPL_VFH_H_