Modular extraction method for point cloud of shield tunnel

doi:10.13474/j.cnki.11-2246.2023.0329

Abstract

Abstract: This paper proposes an extraction method that combines Hough line detection and image matching for shield tunnel module extraction. Firstly, based on the RANSAC algorithm, the shield tunnel is cylindrical unfolded, and the open tunnel point cloud is binarized. Then, the Hough transform algorithm with constraints is used to extract the shield tunnel ring. Finally, based on the special matching module of the number of bolt holes and bolt hole layout in the middle of the inner sealing module and adjacent module of the tunnel ring, the module point cloud is accurately extracted by combining the ring construction size. The algorithm proposed in this paper is validated by scanning point cloud data obtained from a certain subway, and the results show that the algorithm can effectively achieve modular extraction of shield tunnels.

Key words: shield tunnel, Hough line detect, RANSAC algorithm, image matching

CLC Number:

P258

LIN Lesheng, LIN Song. Modular extraction method for point cloud of shield tunnel[J]. Bulletin of Surveying and Mapping, 2023, 0(11): 66-68,106.

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