Abstract

Based on structured-light vision measurement technology, we study a measuring method for microdiameter. The measurement principle and mathematical model are described. A novel grayscale barycenter extraction algorithm along the radial direction is proposed, which can precisely gather the image coordinates of the ellipse-shaped light-stripe centers. The accuracy of the measurement result shows marked improvement by using the algorithm. The method executes circle fitting to the measured three-dimensional (3D) data using linear least square method, which can acquire the diameter, surface profile, and other information of the object effectively. On the scene, a line-structured light vision system using the presented method is applied to measure the curvature radius of metal blades. Experimental results show that the measurement precision of the system is higher than 2 \mu m.

© 2010 Chinese Optics Letters

Dynamic structured-light measurement for wheel diameter based on the cycloid constraint

Zheng Gong, Junhua Sun, and Guangjun Zhang
Appl. Opt. 55(1) 198-207 (2016)

Measurement model of the omnidirectional structured-light vision and its calibration method

Rongfang He, Chang Liu, Zhou Zhang, and Junhua Sun
OSA Continuum 2(3) 839-847 (2019)

Flexible dynamic measurement method of three-dimensional surface profilometry based on multiple vision sensors

Zhen Liu, Xiaojing Li, Fengjiao Li, and Guangjun Zhang
Opt. Express 23(1) 384-400 (2015)

Measurement of shaft diameters by machine vision

Guang Wei and Qingchang Tan
Appl. Opt. 50(19) 3246-3253 (2011)

Defect inspection for underwater structures based on line-structured light and binocular vision

Yi Wu, Yaqin Zhou, Shangjing Chen, Yunpeng Ma, and Qingwu Li
Appl. Opt. 60(25) 7754-7764 (2021)