iss_3d.h

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#ifndef PCL_ISS_3D_H_
#define PCL_ISS_3D_H_

#include <pcl/keypoints/keypoint.h>

namespace pcl
{
  /** \brief ISSKeypoint3D detects the Intrinsic Shape Signatures keypoints for a given
    * point cloud. This class is based on a particular implementation made by Federico
    * Tombari and Samuele Salti and it has been explicitly adapted to PCL.
    *
    * For more information about the original ISS detector, see:
    *
    *\par
    * Yu Zhong, “Intrinsic shape signatures: A shape descriptor for 3D object recognition,”
    * Computer Vision Workshops (ICCV Workshops), 2009 IEEE 12th International Conference on ,
    * vol., no., pp.689-696, Sept. 27 2009-Oct. 4 2009
    *
    * Code example:
    *
    * \code
    * pcl::PointCloud<pcl::PointXYZRGBA>::Ptr model (new pcl::PointCloud<pcl::PointXYZRGBA> ());;
    * pcl::PointCloud<pcl::PointXYZRGBA>::Ptr model_keypoints (new pcl::PointCloud<pcl::PointXYZRGBA> ());
    * pcl::search::KdTree<pcl::PointXYZRGBA>::Ptr tree (new pcl::search::KdTree<pcl::PointXYZRGBA> ());
    *
    * // Fill in the model cloud
    *
    * double model_resolution;
    *
    * // Compute model_resolution
    *
    * pcl::ISSKeypoint3D<pcl::PointXYZRGBA, pcl::PointXYZRGBA> iss_detector;
    *
    * iss_detector.setSearchMethod (tree);
    * iss_detector.setSalientRadius (6 * model_resolution);
    * iss_detector.setNonMaxRadius (4 * model_resolution);
    * iss_detector.setThreshold21 (0.975);
    * iss_detector.setThreshold32 (0.975);
    * iss_detector.setMinNeighbors (5);
    * iss_detector.setNumberOfThreads (4);
    * iss_detector.setInputCloud (model);
    * iss_detector.compute (*model_keypoints);
    * \endcode
    *
    * \author Gioia Ballin
    * \ingroup keypoints
    */

  template <typename PointInT, typename PointOutT, typename NormalT = pcl::Normal>
  class ISSKeypoint3D : public Keypoint<PointInT, PointOutT>
  {
    public:
      typedef boost::shared_ptr<ISSKeypoint3D<PointInT, PointOutT, NormalT> > Ptr;
      typedef boost::shared_ptr<const ISSKeypoint3D<PointInT, PointOutT, NormalT> > ConstPtr;

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

      typedef typename pcl::PointCloud<NormalT> PointCloudN;
      typedef typename PointCloudN::Ptr PointCloudNPtr;
      typedef typename PointCloudN::ConstPtr PointCloudNConstPtr;

      typedef typename pcl::octree::OctreePointCloudSearch<PointInT> OctreeSearchIn;
      typedef typename OctreeSearchIn::Ptr OctreeSearchInPtr;

      using Keypoint<PointInT, PointOutT>::name_;
      using Keypoint<PointInT, PointOutT>::input_;
      using Keypoint<PointInT, PointOutT>::surface_;
      using Keypoint<PointInT, PointOutT>::tree_;
      using Keypoint<PointInT, PointOutT>::search_radius_;
      using Keypoint<PointInT, PointOutT>::search_parameter_;
      using Keypoint<PointInT, PointOutT>::keypoints_indices_;

      /** \brief Constructor.
        * \param[in] salient_radius the radius of the spherical neighborhood used to compute the scatter matrix.
        */
      ISSKeypoint3D (double salient_radius = 0.0001)
      : salient_radius_ (salient_radius)
      , non_max_radius_ (0.0)
      , normal_radius_ (0.0)
      , border_radius_ (0.0)
      , gamma_21_ (0.975)
      , gamma_32_ (0.975)
      , third_eigen_value_ (0)
      , edge_points_ (0)
      , min_neighbors_ (5)
      , normals_ (new pcl::PointCloud<NormalT>)
      , angle_threshold_ (static_cast<float> (M_PI) / 2.0f)
      , threads_ (0)
      {
        name_ = "ISSKeypoint3D";
        search_radius_ = salient_radius_;
      }

      /** \brief Set the radius of the spherical neighborhood used to compute the scatter matrix.
        * \param[in] salient_radius the radius of the spherical neighborhood
        */
      void
      setSalientRadius (double salient_radius);

      /** \brief Set the radius for the application of the non maxima supression algorithm.
        * \param[in] non_max_radius the non maxima suppression radius
        */
      void
      setNonMaxRadius (double non_max_radius);

      /** \brief Set the radius used for the estimation of the surface normals of the input cloud. If the radius is
  * too large, the temporal performances of the detector may degrade significantly.
        * \param[in] normal_radius the radius used to estimate surface normals
        */
      void
      setNormalRadius (double normal_radius);

      /** \brief Set the radius used for the estimation of the boundary points. If the radius is too large,
  * the temporal performances of the detector may degrade significantly.
        * \param[in] border_radius the radius used to compute the boundary points
        */
      void
      setBorderRadius (double border_radius);

      /** \brief Set the upper bound on the ratio between the second and the first eigenvalue.
        * \param[in] gamma_21 the upper bound on the ratio between the second and the first eigenvalue
        */
      void
      setThreshold21 (double gamma_21);

      /** \brief Set the upper bound on the ratio between the third and the second eigenvalue.
        * \param[in] gamma_32 the upper bound on the ratio between the third and the second eigenvalue
        */
      void
      setThreshold32 (double gamma_32);

      /** \brief Set the minimum number of neighbors that has to be found while applying the non maxima suppression algorithm.
        * \param[in] min_neighbors the minimum number of neighbors required
        */
      void
      setMinNeighbors (int min_neighbors);

      /** \brief Set the normals if pre-calculated normals are available.
        * \param[in] normals the given cloud of normals
        */
      void
      setNormals (const PointCloudNConstPtr &normals);

      /** \brief Set the decision boundary (angle threshold) that marks points as boundary or regular.
  * (default \f$\pi / 2.0\f$)
        * \param[in] angle the angle threshold
        */
      inline void
      setAngleThreshold (float angle)
      {
  angle_threshold_ = angle;
      }

      /** \brief Initialize the scheduler and set the number of threads to use.
        * \param[in] nr_threads the number of hardware threads to use (0 sets the value back to automatic)
        */
      inline void
      setNumberOfThreads (unsigned int nr_threads = 0) { threads_ = nr_threads; }

    protected:

      /** \brief Compute the boundary points for the given input cloud.
        * \param[in] input the input cloud
        * \param[in] border_radius the radius used to compute the boundary points
        * \param[in] angle_threshold the decision boundary that marks the points as boundary
        * \return the vector of boolean values in which the information about the boundary points is stored
        */
      bool*
      getBoundaryPoints (PointCloudIn &input, double border_radius, float angle_threshold);

      /** \brief Compute the scatter matrix for a point index.
        * \param[in] current_index the index of the point
        * \param[out] cov_m the point scatter matrix
        */
      void
      getScatterMatrix (const int &current_index, Eigen::Matrix3d &cov_m);

      /** \brief Perform the initial checks before computing the keypoints.
       *  \return true if all the checks are passed, false otherwise
        */
      bool
      initCompute ();

      /** \brief Detect the keypoints by performing the EVD of the scatter matrix.
        * \param[out] output the resultant cloud of keypoints
        */
      void
      detectKeypoints (PointCloudOut &output);


      /** \brief The radius of the spherical neighborhood used to compute the scatter matrix.*/
      double salient_radius_;

      /** \brief The non maxima suppression radius. */
      double non_max_radius_;

      /** \brief The radius used to compute the normals of the input cloud. */
      double normal_radius_;

      /** \brief The radius used to compute the boundary points of the input cloud. */
      double border_radius_;

      /** \brief The upper bound on the ratio between the second and the first eigenvalue returned by the EVD. */
      double gamma_21_;

      /** \brief The upper bound on the ratio between the third and the second eigenvalue returned by the EVD. */
      double gamma_32_;

      /** \brief Store the third eigen value associated to each point in the input cloud. */
      double *third_eigen_value_;

      /** \brief Store the information about the boundary points of the input cloud. */
      bool *edge_points_;

      /** \brief Minimum number of neighbors that has to be found while applying the non maxima suppression algorithm. */
      int min_neighbors_;

      /** \brief The cloud of normals related to the input surface. */
      PointCloudNConstPtr normals_;

      /** \brief The decision boundary (angle threshold) that marks points as boundary or regular. (default \f$\pi / 2.0\f$) */
      float angle_threshold_;

      /** \brief The number of threads that has to be used by the scheduler. */
      unsigned int threads_;

  };

}

#include <pcl/keypoints/impl/iss_3d.hpp>

#endif /* PCL_ISS_3D_H_ */