Modeling of the Three-Dimensional Point Cloud Based on the Binocular Stereovision and Structure Identification

Abstract

The existence of weak planes affects the stability of rock engineering, especially the failure modes of the surrounding rocks. Therefore, investigation of the structural planes of rock mass and the extraction of discontinuities is important for rock mechanics. In this work, the LenaCV binocular stereovision system was studied and applied to establish three-dimensional (3D) surface models. Calibration of the binocular camera parameters, optimal distance discussion, and 3D modeling optimization were conducted. The optimal measuring distance and the intrinsic parameters suitable for the LenaCV stereovision were discussed. Finally, the 3D reconstruction of two case studies was carried out and the 3D point cloud modeling was established. The structural discontinuity mapping in rock faces was also carried out. The feasibility of the binocular stereovision system, as well as the optimum baseline distance, was discussed and verified. The study results can provide a new platform for the economic investigation of 3D rock mass structures and provide a new approach for the efficient extraction of rock mass discontinuities.