Title: Research on the method of vision online distance measurement of laser holes in solar base cell

Authors: Huaiguang Liu; Wanghui Xiao; Yu Cai

Addresses: Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China; Institute of Robotics and Intelligent Systems, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China ' Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China ' Key Laboratory of Metallurgical Equipment and Control Technology of Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China

Abstract: To address the low efficiency of the current off-line laser hole distance method for solar cells (SC), an on-line distance measurement method of laser holes based on image processing is proposed. First, a forward irradiation imaging method with surface light is provided for the SC images. A line detection method of SC edge fitting is proposed and then the sub-pixel coordinates of feature points are obtained according to the laser point extraction algorithm based on the local area, and the distance between the laser hole and edge is calculated. Finally, the precise distance is obtained according to calibrated results between the pixel and millimetre. The experimental results show that this method can accurately measure the laser distances of SC holes, and is more accurate than the existing sub-pixel corner detection algorithm, which verifies the feasibility and accuracy of this method.

Keywords: distance measurement; laser hole ranging; machine vision; solar cells.

DOI: 10.1504/IJWMC.2021.114143

International Journal of Wireless and Mobile Computing, 2021 Vol.20 No.2, pp.179 - 190

Received: 24 Nov 2020
Accepted: 04 Jan 2021
Published online: 09 Apr 2021 *

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