point_cloud_simplification.h

/********************************************************************
 * Copyright (C) 2015 Liangliang Nan <liangliang.nan@gmail.com>
 * https://3d.bk.tudelft.nl/liangliang/
 *
 * This file is part of Easy3D. If it is useful in your research/work,
 * I would be grateful if you show your appreciation by citing it:
 * ------------------------------------------------------------------
 *      Liangliang Nan.
 *      Easy3D: a lightweight, easy-to-use, and efficient C++ library
 *      for processing and rendering 3D data.
 *      Journal of Open Source Software, 6(64), 3255, 2021.
 * ------------------------------------------------------------------
 *
 * Easy3D is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License Version 3
 * as published by the Free Software Foundation.
 *
 * Easy3D is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 ********************************************************************/
 
#ifndef EASY3D_ALGO_POINT_CLOUD_SIMPLIFICATION_H
#define EASY3D_ALGO_POINT_CLOUD_SIMPLIFICATION_H
 
 
#include <vector>
 
#include <easy3d/core/point_cloud.h>
 
 
namespace easy3d {
 
    class KdTreeSearch;
 
    class PointCloudSimplification {
    public:
 
        static float
        average_space(PointCloud *cloud, KdTreeSearch *kdtree = nullptr, int k = 6, bool accurate = false,
                      int samples = 10000
        );
 
        //----- simplification using a grid (non-uniform) ------------------------------------------------
 
        static std::vector<PointCloud::Vertex> grid_simplification(PointCloud *cloud, float cell_size);
 
        //----- uniform simplification (specifying distance threshold) ------------------------------------
 
        static std::vector<PointCloud::Vertex>
        uniform_simplification(PointCloud *cloud, float epsilon, KdTreeSearch *kdtree = nullptr);
 
        //----- uniform simplification (specifying expected point number) ---------------------------------
 
        static std::vector<PointCloud::Vertex> uniform_simplification(PointCloud *cloud, unsigned int num);
    };
 
 
} // namespace easy3d
 
 
#endif  // EASY3D_ALGO_POINT_CLOUD_SIMPLIFICATION_H