template <typename PointInT, typename PointOutT> void pcl::MovingLeastSquares<PointInT, PointOutT>::computeMLSPointNormal (int index, const PointCloudIn &input, const std::vector<int> &nn_indices, std::vector<float> &nn_sqr_dists, PointCloudOut &projected_points, NormalCloud &projected_points_normals) { // Compute the plane coefficients //pcl::computePointNormal<PointInT> (*input_, nn_indices, model_coefficients, curvature); EIGEN_ALIGN16 Eigen::Matrix3f covariance_matrix; Eigen::Vector4f xyz_centroid; // Estimate the XYZ centroid pcl::compute3DCentroid (input, nn_indices, xyz_centroid); //pcl::compute3DCentroid (input, nn_indices, xyz_centroid); pcl::computeCovarianceMatrix (input, nn_indices, xyz_centroid, covariance_matrix); // Compute the 3x3 covariance matrix EIGEN_ALIGN16 Eigen::Vector3f::Scalar eigen_value; EIGEN_ALIGN16 Eigen::Vector3f eigen_vector; Eigen::Vector4f model_coefficients; pcl::eigen33 (covariance_matrix, eigen_value, eigen_vector); model_coefficients.head<3> () = eigen_vector; model_coefficients[3] = 0; model_coefficients[3] = -1 * model_coefficients.dot (xyz_centroid); // Projected query point Eigen::Vector3f point = input[(*indices_)[index]].getVector3fMap (); float distance = point.dot (model_coefficients.head<3> ()) + model_coefficients[3]; point -= distance * model_coefficients.head<3> (); float curvature = covariance_matrix.trace (); // Compute the curvature surface change if (curvature != 0) curvature = fabsf (eigen_value / curvature); // Get a copy of the plane normal easy access Eigen::Vector3d plane_normal = model_coefficients.head<3> ().cast<double> (); // Vector in which the polynomial coefficients will be put Eigen::VectorXd c_vec; // Local coordinate system (Darboux frame) Eigen::Vector3d v (0.0f, 0.0f, 0.0f), u (0.0f, 0.0f, 0.0f); // Perform polynomial fit to update point and normal //////////////////////////////////////////////////// if (polynomial_fit_ && static_cast<int> (nn_indices.size ()) >= nr_coeff_) { // Update neighborhood, since point was projected, and computing relative // positions. Note updating only distances for the weights for speed std::vector<Eigen::Vector3d> de_meaned (nn_indices.size ()); for (size_t ni = 0; ni < nn_indices.size (); ++ni) { de_meaned[ni][0] = input_->points[nn_indices[ni]].x - point[0]; de_meaned[ni][1] = input_->points[nn_indices[ni]].y - point[1]; de_meaned[ni][2] = input_->points[nn_indices[ni]].z - point[2]; nn_sqr_dists[ni] = static_cast<float> (de_meaned[ni].dot (de_meaned[ni])); } // Allocate matrices and vectors to hold the data used for the polynomial fit Eigen::VectorXd weight_vec (nn_indices.size ()); Eigen::MatrixXd P (nr_coeff_, nn_indices.size ()); Eigen::VectorXd f_vec (nn_indices.size ()); Eigen::MatrixXd P_weight; // size will be (nr_coeff_, nn_indices.size ()); Eigen::MatrixXd P_weight_Pt (nr_coeff_, nr_coeff_); // Get local coordinate system (Darboux frame) v = plane_normal.unitOrthogonal (); u = plane_normal.cross (v); // Go through neighbors, transform them in the local coordinate system, // save height and the evaluation of the polynome's terms double u_coord, v_coord, u_pow, v_pow; for (size_t ni = 0; ni < nn_indices.size (); ++ni) { // (re-)compute weights weight_vec (ni) = exp (-nn_sqr_dists[ni] / sqr_gauss_param_); // transforming coordinates u_coord = de_meaned[ni].dot (u); v_coord = de_meaned[ni].dot (v); f_vec (ni) = de_meaned[ni].dot (plane_normal); // compute the polynomial's terms at the current point int j = 0; u_pow = 1; for (int ui = 0; ui <= order_; ++ui) { v_pow = 1; for (int vi = 0; vi <= order_ - ui; ++vi) { P (j++, ni) = u_pow * v_pow; v_pow *= v_coord; } u_pow *= u_coord; } } // Computing coefficients P_weight = P * weight_vec.asDiagonal (); P_weight_Pt = P_weight * P.transpose (); c_vec = P_weight * f_vec; P_weight_Pt.llt ().solveInPlace (c_vec); } switch (upsample_method_) { case (NONE): { Eigen::Vector3d normal = plane_normal; if (polynomial_fit_ && static_cast<int> (nn_indices.size ()) >= nr_coeff_ && pcl_isfinite (c_vec[0])) { point += (c_vec[0] * plane_normal).cast<float> (); // Compute tangent vectors using the partial derivates evaluated at (0,0) which is c_vec[order_+1] and c_vec[1] if (compute_normals_) normal = plane_normal - c_vec[order_ + 1] * u - c_vec[1] * v; } PointOutT aux; aux.x = point[0]; aux.y = point[1]; aux.z = point[2]; projected_points.push_back (aux); if (compute_normals_) { pcl::Normal aux_normal; aux_normal.normal_x = static_cast<float> (normal[0]); aux_normal.normal_y = static_cast<float> (normal[1]); aux_normal.normal_z = static_cast<float> (normal[2]); aux_normal.curvature = curvature; projected_points_normals.push_back (aux_normal); } break; } case (SAMPLE_LOCAL_PLANE): { // Uniformly sample a circle around the query point using the radius and step parameters for (float u_disp = -static_cast<float> (upsampling_radius_); u_disp <= upsampling_radius_; u_disp += static_cast<float> (upsampling_step_)) for (float v_disp = -static_cast<float> (upsampling_radius_); v_disp <= upsampling_radius_; v_disp += static_cast<float> (upsampling_step_)) if (u_disp*u_disp + v_disp*v_disp < upsampling_radius_*upsampling_radius_) { PointOutT projected_point; pcl::Normal projected_normal; projectPointToMLSSurface (u_disp, v_disp, u, v, plane_normal, curvature, point, c_vec, static_cast<int> (nn_indices.size ()), projected_point, projected_normal); projected_points.push_back (projected_point); if (compute_normals_) projected_points_normals.push_back (projected_normal); } break; } case (RANDOM_UNIFORM_DENSITY): { // Compute the local point density and add more samples if necessary int num_points_to_add = static_cast<int> (floor (desired_num_points_in_radius_ / 2.0 / static_cast<double> (nn_indices.size ()))); // Just add the query point, because the density is good if (num_points_to_add <= 0) { // Just add the current point Eigen::Vector3d normal = plane_normal; if (polynomial_fit_ && static_cast<int> (nn_indices.size ()) >= nr_coeff_ && pcl_isfinite (c_vec[0])) { // Projection onto MLS surface along Darboux normal to the height at (0,0) point += (c_vec[0] * plane_normal).cast<float> (); // Compute tangent vectors using the partial derivates evaluated at (0,0) which is c_vec[order_+1] and c_vec[1] if (compute_normals_) normal = plane_normal - c_vec[order_ + 1] * u - c_vec[1] * v; } PointOutT aux; aux.x = point[0]; aux.y = point[1]; aux.z = point[2]; projected_points.push_back (aux); if (compute_normals_) { pcl::Normal aux_normal; aux_normal.normal_x = static_cast<float> (normal[0]); aux_normal.normal_y = static_cast<float> (normal[1]); aux_normal.normal_z = static_cast<float> (normal[2]); aux_normal.curvature = curvature; projected_points_normals.push_back (aux_normal); } } else { // Sample the local plane for (int num_added = 0; num_added < num_points_to_add;) { float u_disp = (*rng_uniform_distribution_) (), v_disp = (*rng_uniform_distribution_) (); // Check if inside circle; if not, try another coin flip if (u_disp * u_disp + v_disp * v_disp > search_radius_ * search_radius_/4) continue; PointOutT projected_point; pcl::Normal projected_normal; projectPointToMLSSurface (u_disp, v_disp, u, v, plane_normal, curvature, point, c_vec, static_cast<int> (nn_indices.size ()), projected_point, projected_normal); projected_points.push_back (projected_point); if (compute_normals_) projected_points_normals.push_back (projected_normal); num_added ++; } } break; } case (VOXEL_GRID_DILATION): { // Take all point pairs and sample space between them in a grid-fashion // \note consider only point pairs with increasing indices MLSResult result (plane_normal, u, v, c_vec, static_cast<int> (nn_indices.size ()), curvature); mls_results_[index] = result; break; } } }
template <typename PointT> void pcl::MLSResult::computeMLSSurface (const pcl::PointCloud<PointT> &cloud, int index, const std::vector<int> &nn_indices, double search_radius, int polynomial_order, boost::function<double(const double)> weight_func) { // Compute the plane coefficients EIGEN_ALIGN16 Eigen::Matrix3d covariance_matrix; Eigen::Vector4d xyz_centroid; // Estimate the XYZ centroid pcl::compute3DCentroid (cloud, nn_indices, xyz_centroid); // Compute the 3x3 covariance matrix pcl::computeCovarianceMatrix (cloud, nn_indices, xyz_centroid, covariance_matrix); EIGEN_ALIGN16 Eigen::Vector3d::Scalar eigen_value; EIGEN_ALIGN16 Eigen::Vector3d eigen_vector; Eigen::Vector4d model_coefficients (0, 0, 0, 0); pcl::eigen33 (covariance_matrix, eigen_value, eigen_vector); model_coefficients.head<3> ().matrix () = eigen_vector; model_coefficients[3] = -1 * model_coefficients.dot (xyz_centroid); // Projected query point valid = true; query_point = cloud.points[index].getVector3fMap ().template cast<double> (); double distance = query_point.dot (model_coefficients.head<3> ()) + model_coefficients[3]; mean = query_point - distance * model_coefficients.head<3> (); curvature = covariance_matrix.trace (); // Compute the curvature surface change if (curvature != 0) curvature = std::abs (eigen_value / curvature); // Get a copy of the plane normal easy access plane_normal = model_coefficients.head<3> (); // Local coordinate system (Darboux frame) v_axis = plane_normal.unitOrthogonal (); u_axis = plane_normal.cross (v_axis); // Perform polynomial fit to update point and normal //////////////////////////////////////////////////// num_neighbors = static_cast<int> (nn_indices.size ()); order = polynomial_order; if (order > 1) { int nr_coeff = (order + 1) * (order + 2) / 2; if (num_neighbors >= nr_coeff) { // Note: The max_sq_radius parameter is only used if weight_func was not defined double max_sq_radius = 1; if (weight_func == 0) { max_sq_radius = search_radius * search_radius; weight_func = boost::bind (&pcl::MLSResult::computeMLSWeight, this, _1, max_sq_radius); } // Allocate matrices and vectors to hold the data used for the polynomial fit Eigen::VectorXd weight_vec (num_neighbors); Eigen::MatrixXd P (nr_coeff, num_neighbors); Eigen::VectorXd f_vec (num_neighbors); Eigen::MatrixXd P_weight; // size will be (nr_coeff_, nn_indices.size ()); Eigen::MatrixXd P_weight_Pt (nr_coeff, nr_coeff); // Update neighborhood, since point was projected, and computing relative // positions. Note updating only distances for the weights for speed std::vector<Eigen::Vector3d, Eigen::aligned_allocator<Eigen::Vector3d> > de_meaned (num_neighbors); for (size_t ni = 0; ni < (size_t) num_neighbors; ++ni) { de_meaned[ni][0] = cloud.points[nn_indices[ni]].x - mean[0]; de_meaned[ni][1] = cloud.points[nn_indices[ni]].y - mean[1]; de_meaned[ni][2] = cloud.points[nn_indices[ni]].z - mean[2]; weight_vec (ni) = weight_func (de_meaned[ni].dot (de_meaned[ni])); } // Go through neighbors, transform them in the local coordinate system, // save height and the evaluation of the polynome's terms double u_coord, v_coord, u_pow, v_pow; for (size_t ni = 0; ni < (size_t) num_neighbors; ++ni) { // Transforming coordinates u_coord = de_meaned[ni].dot (u_axis); v_coord = de_meaned[ni].dot (v_axis); f_vec (ni) = de_meaned[ni].dot (plane_normal); // Compute the polynomial's terms at the current point int j = 0; u_pow = 1; for (int ui = 0; ui <= order; ++ui) { v_pow = 1; for (int vi = 0; vi <= order - ui; ++vi) { P (j++, ni) = u_pow * v_pow; v_pow *= v_coord; } u_pow *= u_coord; } } // Computing coefficients P_weight = P * weight_vec.asDiagonal (); P_weight_Pt = P_weight * P.transpose (); c_vec = P_weight * f_vec; P_weight_Pt.llt ().solveInPlace (c_vec); } } }