Title :
A new surface inspection method of TWBS based on active laser-triangulation
Author :
Zhang, Lei ; Zhao, Mingyang ; Zou, Yuanyuan ; Gao, Shiyi
Author_Institution :
Grad. Sch. of the Chinese Acad. of Sci., Chinese Acad. of Sci., Shenyang
Abstract :
An vision inspection sensor system for the automation of laser welding processes in heavy industries is presented. The system consists of PC based vision camera and stripe type laser diode. For image de-noising, a new surface inspection method of Tailor-welded blanks including in: median filtering, bi-level thresholding, opening and closing, mid-line of the laser stripe extraction, has been developed. After extracting the middle line of the laser stripe, the algorithms of calculating bead width, mismatch, weld slope, convexity, concavity, overthickness and undercut are proposed. Finally, A series of experiments show that the proposed method in this paper is effective.
Keywords :
image denoising; inspection; laser beam welding; production engineering computing; semiconductor lasers; sensors; PC based vision camera; active laser-triangulation; heavy industries; image denoising; laser stripe extraction; laser welding process; median filtering; stripe type laser diode; surface inspection method; tailor-welded blanks; vision inspection sensor system; Automation; Cameras; Diode lasers; Filtering; Image denoising; Inspection; Machine vision; Sensor systems; Surface emitting lasers; Welding; Laser-triangulation; image processing; surface inspection; weld defect detection;
Conference_Titel :
Intelligent Control and Automation, 2008. WCICA 2008. 7th World Congress on
Conference_Location :
Chongqing
Print_ISBN :
978-1-4244-2113-8
Electronic_ISBN :
978-1-4244-2114-5
DOI :
10.1109/WCICA.2008.4593090