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 * $Id: gfpfh.h 1423 2011-06-21 09:51:32Z bouffa $
 *
 */

#ifndef PCL_GFPFH_H_
#define PCL_GFPFH_H_

#include <pcl/features/feature.h>

namespace pcl
{
  /** \brief @b GFPFHEstimation estimates the Global Fast Point Feature Histogram (GFPFH) descriptor for a given point
    * cloud dataset containing points and labels.
    *
    * @note If you use this code in any academic work, please cite:
    *
    * <ul>
    * <li> R.B. Rusu, A. Holzbach, M. Beetz.
    *      Detecting and Segmenting Objects for Mobile Manipulation.
    *      In the S3DV Workshop of the 12th International Conference on Computer Vision (ICCV),
    *      2009.
    * </li>
    * </ul>
    *
    * \author Radu B. Rusu
    * \ingroup features
    */
  template <typename PointInT, typename PointLT, typename PointOutT>
  class GFPFHEstimation : public FeatureFromLabels<PointInT, PointLT, PointOutT>
  {
    public:
      typedef boost::shared_ptr<GFPFHEstimation<PointInT, PointLT, PointOutT> > Ptr;
      typedef boost::shared_ptr<const GFPFHEstimation<PointInT, PointLT, PointOutT> > ConstPtr;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::feature_name_;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::getClassName;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::indices_;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::k_;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::search_parameter_;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::surface_;

      using FeatureFromLabels<PointInT, PointLT, PointOutT>::input_;
      using FeatureFromLabels<PointInT, PointLT, PointOutT>::labels_;

      typedef typename Feature<PointInT, PointOutT>::PointCloudOut PointCloudOut;
      typedef typename Feature<PointInT, PointOutT>::PointCloudIn  PointCloudIn;

      /** \brief Empty constructor. */
      GFPFHEstimation () : 
        octree_leaf_size_ (0.01),
        number_of_classes_ (16),
        descriptor_size_ (PointOutT::descriptorSize ())
      {
        feature_name_ = "GFPFHEstimation";
      }

      /** \brief Set the size of the octree leaves.
        */
      inline void
      setOctreeLeafSize (double size) { octree_leaf_size_ = size; }

      /** \brief Get the sphere radius used for determining the neighbors. */
      inline double
      getOctreeLeafSize () { return (octree_leaf_size_); }

      /** \brief Return the empty label value. */
      inline uint32_t
      emptyLabel () const { return 0; }

      /** \brief Return the number of different classes. */
      inline uint32_t
      getNumberOfClasses () const { return number_of_classes_; }

      /** \brief Set the number of different classes.
       * \param n number of different classes.
       */
      inline void
      setNumberOfClasses (uint32_t n) { number_of_classes_ = n; }

      /** \brief Return the size of the descriptor. */
      inline int
      descriptorSize () const { return descriptor_size_; }

      /** \brief Overloaded computed method from pcl::Feature.
        * \param[out] output the resultant point cloud model dataset containing the estimated features
        */
      void
      compute (PointCloudOut &output);

    protected:

      /** \brief Estimate the Point Feature Histograms (PFH) descriptors at a set of points given by
        * <setInputCloud (), setIndices ()> using the surface in setSearchSurface () and the spatial locator in
        * setSearchMethod ()
        * \param output the resultant point cloud model dataset that contains the PFH feature estimates
        */
      void 
      computeFeature (PointCloudOut &output);

      /** \brief Return the dominant label of a set of points. */
      uint32_t
      getDominantLabel (const std::vector<int>& indices);

      /** \brief Compute the fixed-length histograms of transitions. */
      void computeTransitionHistograms (const std::vector< std::vector<int> >& label_histograms,
                                        std::vector< std::vector<int> >& transition_histograms);

      /** \brief Compute the distance of each transition histogram to the mean. */
      void
      computeDistancesToMean (const std::vector< std::vector<int> >& transition_histograms,
                              std::vector<float>& distances);

      /** \brief Return the Intersection Kernel distance between two histograms. */
      float
      computeHIKDistance (const std::vector<int>& histogram,
                          const std::vector<float>& mean_histogram);

      /** \brief Compute the binned histogram of distance values. */
      void
      computeDistanceHistogram (const std::vector<float>& distances,
                                std::vector<float>& histogram);

      /** \brief Compute the mean histogram of the given set of histograms. */
      void
      computeMeanHistogram (const std::vector< std::vector<int> >& histograms,
                            std::vector<float>& mean_histogram);

    private:
      /** \brief Size of octree leaves. */
      double octree_leaf_size_;

      /** \brief Number of possible classes/labels. */
      uint32_t number_of_classes_;

      /** \brief Dimension of the descriptors. */
      int descriptor_size_;
   };
}

#ifdef PCL_NO_PRECOMPILE
#include <pcl/features/impl/gfpfh.hpp>
#endif

#endif  //#ifndef PCL_GFPFH_H_
