organized_connected_component_segmentation.h

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#pragma once
 
#include <pcl/pcl_base.h>
#include <pcl/PointIndices.h>
#include <pcl/segmentation/comparator.h>
 
namespace pcl
{
  /** \brief OrganizedConnectedComponentSegmentation allows connected
    * components to be found within organized point cloud data, given a
    * comparison function.  Given an input cloud and a comparator, it will
    * output a PointCloud of labels, giving each connected component a unique
    * id, along with a vector of PointIndices corresponding to each component.
    * See OrganizedMultiPlaneSegmentation for an example application.
    *
    * \author Alex Trevor, Suat Gedikli
    * \ingroup segmentation
    */
  template <typename PointT, typename PointLT>
  class OrganizedConnectedComponentSegmentation : public PCLBase<PointT>
  {
    using PCLBase<PointT>::input_;
    using PCLBase<PointT>::indices_;
    using PCLBase<PointT>::initCompute;
    using PCLBase<PointT>::deinitCompute;
 
    public:
      using PointCloud = pcl::PointCloud<PointT>;
      using PointCloudPtr = typename PointCloud::Ptr;
      using PointCloudConstPtr = typename PointCloud::ConstPtr;
      
      using PointCloudL = pcl::PointCloud<PointLT>;
      using PointCloudLPtr = typename PointCloudL::Ptr;
      using PointCloudLConstPtr = typename PointCloudL::ConstPtr;
 
      using Comparator = pcl::Comparator<PointT>;
      using ComparatorPtr = typename Comparator::Ptr;
      using ComparatorConstPtr = typename Comparator::ConstPtr;
      
      /** \brief Constructor for OrganizedConnectedComponentSegmentation
        * \param[in] compare A pointer to the comparator to be used for segmentation.  Must be an instance of pcl::Comparator.
        */
      OrganizedConnectedComponentSegmentation (const ComparatorConstPtr& compare)
        : compare_ (compare)
      {
      }
 
      /** \brief Destructor for OrganizedConnectedComponentSegmentation. */
      
      ~OrganizedConnectedComponentSegmentation () override = default;
 
      /** \brief Provide a pointer to the comparator to be used for segmentation.
        * \param[in] compare the comparator
        */
      void
      setComparator (const ComparatorConstPtr& compare)
      {
        compare_ = compare;
      }
      
      /** \brief Get the comparator.*/
      ComparatorConstPtr
      getComparator () const { return (compare_); }
 
      /** \brief Perform the connected component segmentation.
        * \param[out] labels a PointCloud of labels: each connected component will have a unique id.
        * \param[out] label_indices a vector of PointIndices corresponding to each label / component id.
        */
      void
      segment (pcl::PointCloud<PointLT>& labels, std::vector<pcl::PointIndices>& label_indices) const;
      
      /** \brief Find the boundary points / contour of a connected component
        * \param[in] start_idx the first (lowest) index of the connected component for which a boundary should be returned
        * \param[in] labels the Label cloud produced by segmentation
        * \param[out] boundary_indices the indices of the boundary points for the label corresponding to start_idx
        */
      static void
      findLabeledRegionBoundary (int start_idx, PointCloudLPtr labels, pcl::PointIndices& boundary_indices);      
      
 
    protected:
      ComparatorConstPtr compare_;
      
      inline unsigned
      findRoot (const std::vector<unsigned>& runs, unsigned index) const
      {
        unsigned idx = index;
        while (runs[idx] != idx)
          idx = runs[idx];
 
        return (idx);
      }
 
    private:
      struct Neighbor
      {
        Neighbor (int dx, int dy, int didx)
        : d_x (dx)
        , d_y (dy)
        , d_index (didx)
        {}
        
        int d_x;
        int d_y;
        int d_index; // = dy * width + dx: pre-calculated
      };
  };
}
 
#ifdef PCL_NO_PRECOMPILE
#include <pcl/segmentation/impl/organized_connected_component_segmentation.hpp>
#endif