transformation_estimation_svd.hpp

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#ifndef PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_SVD_HPP_
#define PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_SVD_HPP_

template <typename PointSource, typename PointTarget> inline void
pcl::registration::TransformationEstimationSVD<PointSource, PointTarget>::estimateRigidTransformation (
    const pcl::PointCloud<PointSource> &cloud_src,
    const pcl::PointCloud<PointTarget> &cloud_tgt,
    Eigen::Matrix4f &transformation_matrix)
{
  // <cloud_src,cloud_src> is the source dataset
  transformation_matrix.setIdentity ();

  Eigen::Vector4f centroid_src, centroid_tgt;
  // Estimate the centroids of source, target
  compute3DCentroid (cloud_src, centroid_src);
  compute3DCentroid (cloud_tgt, centroid_tgt);

  // Subtract the centroids from source, target
  Eigen::MatrixXf cloud_src_demean;
  demeanPointCloud (cloud_src, centroid_src, cloud_src_demean);

  Eigen::MatrixXf cloud_tgt_demean;
  demeanPointCloud (cloud_tgt, centroid_tgt, cloud_tgt_demean);

  getTransformationFromCorrelation (cloud_src_demean, centroid_src, cloud_tgt_demean, centroid_tgt, transformation_matrix);
}

template <typename PointSource, typename PointTarget> void
pcl::registration::TransformationEstimationSVD<PointSource, PointTarget>::estimateRigidTransformation (
    const pcl::PointCloud<PointSource> &cloud_src,
    const std::vector<int> &indices_src,
    const pcl::PointCloud<PointTarget> &cloud_tgt,
    Eigen::Matrix4f &transformation_matrix)
{
  if (indices_src.size () != cloud_tgt.points.size ())
  {
    PCL_ERROR ("[pcl::TransformationSVD::estimateRigidTransformation] Number or points in source (%zu) differs than target (%zu)!\n", indices_src.size (), cloud_tgt.points.size ());
    return;
  }

  // <cloud_src,cloud_src> is the source dataset
  transformation_matrix.setIdentity ();

  Eigen::Vector4f centroid_src, centroid_tgt;
  // Estimate the centroids of source, target
  compute3DCentroid (cloud_src, indices_src, centroid_src);
  compute3DCentroid (cloud_tgt, centroid_tgt);

  // Subtract the centroids from source, target
  Eigen::MatrixXf cloud_src_demean;
  demeanPointCloud (cloud_src, indices_src, centroid_src, cloud_src_demean);

  Eigen::MatrixXf cloud_tgt_demean;
  demeanPointCloud (cloud_tgt, centroid_tgt, cloud_tgt_demean);

  getTransformationFromCorrelation (cloud_src_demean, centroid_src, cloud_tgt_demean, centroid_tgt, transformation_matrix);
}


template <typename PointSource, typename PointTarget> inline void
pcl::registration::TransformationEstimationSVD<PointSource, PointTarget>::estimateRigidTransformation (
    const pcl::PointCloud<PointSource> &cloud_src,
    const std::vector<int> &indices_src,
    const pcl::PointCloud<PointTarget> &cloud_tgt,
    const std::vector<int> &indices_tgt,
    Eigen::Matrix4f &transformation_matrix)
{
  if (indices_src.size () != indices_tgt.size ())
  {
    PCL_ERROR ("[pcl::TransformationEstimationSVD::estimateRigidTransformation] Number or points in source (%zu) differs than target (%zu)!\n", indices_src.size (), indices_tgt.size ());
    return;
  }

  // <cloud_src,cloud_src> is the source dataset
  transformation_matrix.setIdentity ();

  Eigen::Vector4f centroid_src, centroid_tgt;
  // Estimate the centroids of source, target
  compute3DCentroid (cloud_src, indices_src, centroid_src);
  compute3DCentroid (cloud_tgt, indices_tgt, centroid_tgt);

  // Subtract the centroids from source, target
  Eigen::MatrixXf cloud_src_demean;
  demeanPointCloud (cloud_src, indices_src, centroid_src, cloud_src_demean);

  Eigen::MatrixXf cloud_tgt_demean;
  demeanPointCloud (cloud_tgt, indices_tgt, centroid_tgt, cloud_tgt_demean);

  getTransformationFromCorrelation (cloud_src_demean, centroid_src, cloud_tgt_demean, centroid_tgt, transformation_matrix);
}

template <typename PointSource, typename PointTarget> void
pcl::registration::TransformationEstimationSVD<PointSource, PointTarget>::estimateRigidTransformation (
    const pcl::PointCloud<PointSource> &cloud_src,
    const pcl::PointCloud<PointTarget> &cloud_tgt,
    const pcl::Correspondences &correspondences,
    Eigen::Matrix4f &transformation_matrix)
{
  std::vector<int> indices_src, indices_tgt;
  pcl::registration::getQueryIndices (correspondences, indices_src);
  pcl::registration::getMatchIndices (correspondences, indices_tgt);

  // <cloud_src,cloud_src> is the source dataset
  Eigen::Vector4f centroid_src, centroid_tgt;
  // Estimate the centroids of source, target
  compute3DCentroid (cloud_src, indices_src, centroid_src);
  compute3DCentroid (cloud_tgt, indices_tgt, centroid_tgt);

  // Subtract the centroids from source, target
  Eigen::MatrixXf cloud_src_demean;
  demeanPointCloud (cloud_src, indices_src, centroid_src, cloud_src_demean);

  Eigen::MatrixXf cloud_tgt_demean;
  demeanPointCloud (cloud_tgt, indices_tgt, centroid_tgt, cloud_tgt_demean);

  getTransformationFromCorrelation (cloud_src_demean, centroid_src, cloud_tgt_demean, centroid_tgt, transformation_matrix);
}

template <typename PointSource, typename PointTarget> void
pcl::registration::TransformationEstimationSVD<PointSource, PointTarget>::getTransformationFromCorrelation (
    const Eigen::MatrixXf &cloud_src_demean,
    const Eigen::Vector4f &centroid_src,
    const Eigen::MatrixXf &cloud_tgt_demean,
    const Eigen::Vector4f &centroid_tgt,
    Eigen::Matrix4f &transformation_matrix)
{
  transformation_matrix.setIdentity ();

  // Assemble the correlation matrix H = source * target'
  Eigen::Matrix3f H = (cloud_src_demean * cloud_tgt_demean.transpose ()).topLeftCorner<3, 3>();

  // Compute the Singular Value Decomposition
  Eigen::JacobiSVD<Eigen::Matrix3f> svd (H, Eigen::ComputeFullU | Eigen::ComputeFullV);
  Eigen::Matrix3f u = svd.matrixU ();
  Eigen::Matrix3f v = svd.matrixV ();

  // Compute R = V * U'
  if (u.determinant () * v.determinant () < 0)
  {
    for (int x = 0; x < 3; ++x)
      v (x, 2) *= -1;
  }

  Eigen::Matrix3f R = v * u.transpose ();

  // Return the correct transformation
  transformation_matrix.topLeftCorner<3, 3> () = R;
  const Eigen::Vector3f Rc (R * centroid_src.head<3> ());
  transformation_matrix.block <3, 1> (0, 3) = centroid_tgt.head<3> () - Rc;
}

//#define PCL_INSTANTIATE_TransformationEstimationSVD(T,U) template class PCL_EXPORTS pcl::registration::TransformationEstimationSVD<T,U>;

#endif /* PCL_REGISTRATION_TRANSFORMATION_ESTIMATION_SVD_HPP_ */