Machine-vision-based Defect Detection Using Circular Hough Transform in Laser Welding
Qiao Ding, Jianhua Ji, Feng Gao, Yatao Yang · Advances in engineering research/Advances in Engineering Research · 2016
In the field of laser welding, image processing technology is the general method to detect defects on the surface of the seam.Here the Hough Transform is introduced into the defect detection and the accuracy is greatly improved.The process is to use the industrial CCD(Chargecoupled Device) camera for image acquisition, then use Canny operator for edge detection, use Circular Hough Transform to locate the weld seam position, and finally compare the number of continuous pixels with the defect criteria to report detection results.Experimental data show that the false positive rate and false negative rate are greatly reduced after the Hough Transform is introduced into the defect detection, which has met the industrial requirements.