Title :
Vision-Based Profile Generation Method of TWB for a New Automatic Laser Welding Line
Author :
Zhang, Lei ; Zhao, Mingyang ; Zhao, Lihua
Author_Institution :
Chinese Acad. of Sci., Shenyang
Abstract :
An on-line vision inspection sensor system for the automation of laser welding processes in heavy industries is presented. A method of image process and features extraction for structured light image of laser welding has been developed. In order to set the range of interest, the Radon transform is applied to determine the x and y coordinate in image coordinate system. For image de-noising, the median filtering and bi-level thresholding are used. Furthermore, the middle line of the laser stripe is extracted. Finally, a five step search method is carried out to examine the bead width. A series of experiments show that the proposed method in this paper is effective, and its detection precision is much better than traditional methods.
Keywords :
Radon transforms; computer vision; feature extraction; filtering theory; image denoising; image segmentation; inspection; laser beam welding; production engineering computing; search problems; sensors; Radon transform; automatic laser welding line; bilevel thresholding; features extraction; heavy industries; image denoising; image processing; laser stripe extraction; median filtering; online vision inspection sensor system; step search method; tailor-welded blanks; vision-based profile generation method; Apertures; Automation; Feature extraction; Filtering; Inspection; Laser modes; Laser theory; Mechanical factors; Vehicles; Welding; features extraction; image processing; structure light vision; weld defect detection;
Conference_Titel :
Automation and Logistics, 2007 IEEE International Conference on
Conference_Location :
Jinan
Print_ISBN :
978-1-4244-1531-1
DOI :
10.1109/ICAL.2007.4338838