pfhrgb.cpp

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/*
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 *
 *  Copyright (c) 2011, Alexandru-Eugen Ichim
 *                      Willow Garage, Inc
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 *  $Id: pfhrgb.cpp 6144 2012-07-04 22:06:28Z rusu $
 */

#include <pcl/point_types.h>
#include <pcl/impl/instantiate.hpp>
#include <pcl/features/pfhrgb.h>
#include <pcl/features/impl/pfhrgb.hpp>

bool
pcl::computeRGBPairFeatures (const Eigen::Vector4f &p1, const Eigen::Vector4f &n1, const Eigen::Vector4i &colors1,
                             const Eigen::Vector4f &p2, const Eigen::Vector4f &n2, const Eigen::Vector4i &colors2,
                             float &f1, float &f2, float &f3, float &f4, float &f5, float &f6, float &f7)
{
  Eigen::Vector4f dp2p1 = p2 - p1;
  dp2p1[3] = 0.0f;
  f4 = dp2p1.norm ();

  if (f4 == 0.0f)
  {
    PCL_DEBUG ("Euclidean distance between points is 0!\n");
    f1 = f2 = f3 = f4 = 0.0f;
    return (false);
  }

  Eigen::Vector4f n1_copy = n1,
      n2_copy = n2;
  n1_copy[3] = n2_copy[3] = 0.0f;
  float angle1 = n1_copy.dot (dp2p1) / f4;

  f3 = angle1;

  // Create a Darboux frame coordinate system u-v-w
  // u = n1; v = (p_idx - q_idx) x u / || (p_idx - q_idx) x u ||; w = u x v
  Eigen::Vector4f v = dp2p1.cross3 (n1_copy);
  v[3] = 0.0f;
  float v_norm = v.norm ();
  if (v_norm == 0.0f)
  {
    PCL_DEBUG ("Norm of Delta x U is 0!\n");
    f1 = f2 = f3 = f4 = 0.0f;
    return (false);
  }
  // Normalize v
  v /= v_norm;

  Eigen::Vector4f w = n1_copy.cross3 (v);
  // Do not have to normalize w - it is a unit vector by construction

  v[3] = 0.0f;
  f2 = v.dot (n2_copy);
  w[3] = 0.0f;
  // Compute f1 = arctan (w * n2, u * n2) i.e. angle of n2 in the x=u, y=w coordinate system
  f1 = atan2f (w.dot (n2_copy), n1_copy.dot (n2_copy)); // @todo optimize this

  // everything before was standard 4D-Darboux frame feature pair
  // now, for the experimental color stuff
  f5 = (colors2[0] != 0) ? static_cast<float> (colors1[0] / colors2[0]) : 1.0f;
  f6 = (colors2[1] != 0) ? static_cast<float> (colors1[1] / colors2[1]) : 1.0f;
  f7 = (colors2[2] != 0) ? static_cast<float> (colors1[2] / colors2[2]) : 1.0f;

  // make sure the ratios are in the [-1, 1] interval
  if (f5 > 1.0f) f5 = - 1.0f / f5;
  if (f6 > 1.0f) f6 = - 1.0f / f6;
  if (f7 > 1.0f) f7 = - 1.0f / f7;

  return (true);
}

// Instantiations of specific point types
#ifdef PCL_ONLY_CORE_POINT_TYPES
  PCL_INSTANTIATE_PRODUCT(PFHRGBEstimation, ((pcl::PointXYZRGBA)(pcl::PointXYZRGB)(pcl::PointXYZRGBNormal))
                          ((pcl::Normal)(pcl::PointXYZRGBNormal))
                          ((pcl::PFHRGBSignature250)))
#else
  PCL_INSTANTIATE_PRODUCT(PFHRGBEstimation, ((pcl::PointXYZRGB)(pcl::PointXYZRGBA)(pcl::PointXYZRGBNormal))
                          (PCL_NORMAL_POINT_TYPES)
                          ((pcl::PFHRGBSignature250)))
#endif