Examinando por Materia "3D point clouds"

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    3D scene reconstruction Based on a 2D moving LiDAR
    (Springer, Cham, 2018-10-25) Murcia Moreno, Harold Fabián; Monroy, Maria Fernanda; Mora, Luis Fernando
    A real-world reconstruction from a computer graphics tool is one of the main issues in two different communities: robotics and artificial intelligence, both of them under different points of view such as computer science, perception and machine vision. A real scene can be reconstructed by generating of point clouds with the help of depth sensors, rotational elements and mathematical transformations according to the mechanical design. This paper presents the development of a three-dimensional laser range finder based on a two-dimensional laser scanner Hokuyo URG-04LX-UG01 and a step motor. The design and kinematic model of the system to generate 3D point clouds are presented with an experimental acquisition algorithm implemented on Robotic Operative System ROS in Python language. The quality of the generated reconstruction is improved with a calibration algorithm based on a model parameter optimization from a reference surface, the results from the calibrated model were compared with a commercial low-cost device. The concurrent application of the system permits the viewing of the scene from different perspectives. The output files can be easily visualized with Python or MATLAB and used for surface reconstruction, scene classification or mapping. In this way, typical robotic tasks can be realized, highlighting autonomous navigation, collision avoidance, grasp calculation and handling of objects.
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    Reconstrucción de Imágenes 3D a partir de un sensor LiDAR de bajo costo.
    (Universidad de Ibagué, 2019) Mora Rios, Luis Fernando; Murcia, Harold Fabián
    This thesis report is the product of a degree project to obtain the degree of electronic engineer. It presents the development of a 3D reconstruction system using a 2D LiDAR sensor and two actuators. The document describes a process of characterization of the devices, modeling of the mechanical layer, electronic design and design and implementation of software using the ROS platform. With the help of the kinematic model it is possible to obtain a transformation matrix that, after being experimentally calibrated, gives rise to a cloud of three-dimensional points. It was obtained a system with two degrees of freedom of low cost applicable in a high range of Hokuyo 2D. In addition, artificial intelligence is essential for solving problems or in the field of research.