Title: Structured light-based dynamic 3D measurement system for cold-formed steel hollow sections

Authors: Zemin Mao; Dahua Li; Xuewen Zhao

Addresses: Technical College for the Deaf, Tianjin University of Technology, Tianjin, 300384, China ' School of Electrical Engineering and Automation, Tianjin University of Technology, Tianjin, 300384, China ' School of Electrical Engineering and Automation, Tianjin University of Technology, Tianjin, 300384, China

Abstract: In the cold-formed steel hollow section manufacturing process, one of the key stages is forming an inspection to check whether it meets the requirement. In this paper, a dynamic 3D measurement system based on low-cost structured light was presented, which can be used to measure the dimensions of a cold-formed steel hollow section in real-time. The system is mainly composed of four sets line-structured light inspection device. A temporary coordinate is proposed to assist in solving multi the calibration of structured light plane. An optimisation method of L-M algorithm is proposed to solve the problem of stitching accuracy of point cloud contour. A point cloud simplification processing method is proposed for solving main parameters. The side length measurement error of the system is within ±0.05 mm, and the outer arc radius measurement error is within ±0.45 mm. All parallelisable tasks can achieve an acquisition rate of up to 25 fps.

Keywords: cold-formed steel hollow sections; structured light; machine vision; camera calibration; projector calibration; point cloud; optimisation; profile measurement.

DOI: 10.1504/IJMMS.2022.124920

International Journal of Mechatronics and Manufacturing Systems, 2022 Vol.15 No.2/3, pp.203 - 225

Received: 17 Feb 2022
Accepted: 20 May 2022
Published online: 16 Aug 2022 *

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