an alpha value (0< α < ∞) is a parameter imposing the precision of the final boundary. A large value(α->∞) results in the alpha boundary of a convex hull while a small value (α->0) means that every point can be the boundary point. 暴力思想: 预定义圆的半径r,遍历点集P内的任...
The registered point cloud was triangulated using the Alpha-shape algorithm to achieve surface reconstruction. The above-mentioned methods of initial registration and precise registration were used to globally register multiple jujube trees and completely reconstruct the three-dimensional model...
surface reconstruction;Alpha shape;average distance of k-nearest neighbors;Alpha—shapealgorithm引 言三维物体表面重建是获取三维空间信息建立该物体的三维模型,在3D城市、3D游戏等场景建模有着重要应用[11;在林业信息化测量中,利用重建的树冠形状,准确求解树冠体积、表面积和占地面积等信基金项目:国家自然科学基金(...
algorithm.h> typedef CGAL::Exact_predicates_inexact_constructions_kernel K; typedef K::FT FT; typedef K::Point_2 Point; typedef K::Segment_2 Segment; typedef CGAL::Alpha_shape_vertex_base_2<K> Vb; typedef CGAL::Alpha_shape_face_base_2<K> Fb; typedef CGAL::Triangulation_data_structure_...
// System.out.println("sha1 (Generated by Java built-in algorithm): " + b.toString(16)); } } class SHA1 { static String generate(byte[] dataBytes) throws Exception { byte[] fillBytes = new byte[64 * ((dataBytes.length + 8) / 64 + 1)]; ...
Third, they can be computed efficiently using theDelaunay triangulation, which is a well-known and widely used algorithm. Alpha shapes have been used in a variety of applications, including image processing, computer graphics, and computational geometry. In image processing, they can be used to ...
The registered point cloud was triangulated using the Alpha-shape algorithm to achieve surface reconstruction. The above-mentioned methods of initial registration and precise registration were used to globally register multiple jujube trees and completely reconstruct the three-dimensional model of fruit ...
文An efficient sweep-line Delaunay triangulation algorithm[Borut Zˇalik 2005.], 复杂度为O(nlgn)。此算法中涉及到advancing front 的概念,将所有点按y 坐 标排序,如下图点12 到点7 为此时的advancing front,当扫描到点15 时若连 接的三角形14-15-11 符合delaunay 三角形性质则加入结果集。
Alphashape 轮廓线提取-实验总结报告 马靖 吉晓飞 徐峰 2014213475 2014213472 2014213510 软件学院 软件学院 软件学院 1554594081@ 296722640@ 517326756@ 1 简介 2 2 功能描述 2 2.1 实验环境 2 2.2 使用手册 2 2.3 项目清单 3 3 算法 4 3.1 图片边缘点提取 4 3.2 delaunay 三角剖分 4 3.3 Alpha Shape 6 ...
The alpha shape algorithm works by constructing a Delaunay triangulation of the points, which forms a network of triangles connecting the points in such a way that no point is inside the circumcircle of anytriangle. By removing edges from the Delaunay triangulation based on the alpha parameter, ...