Laser Seam Tracking Based On Image Recognition Technology

With the rapid development of production automation and intelligentize technology, all kinds of new technologies have been widely used in the welding field. The welding automatic tracking system has been an important part of the welding automatic control field.A seam laser tracking system based on image recognition is studied. Laser is used as the assistant lamp-house irradiating at the welding line before welding torch. CCD collects the laser light images reflected from the surface of workpieces, then memories them as digital images into computers. Be carried on processing the images and recognizing the eigenvalues taken by the computer, we can get the warp between the torch and the welding seam, and carry on rectifying to the deviation.(1) On the basis of analysis and studying about development of weld seam-tracking home and abroad, this paper brings forward a seam laser tracking system based on laser structure light, also the paper discusses the system class and image processing about weld-tracking.(2) In order to preprocess image, filter methods of image processing and edge detection is used, so obtaining the aim of getting rid of noise, edge detection and making weld seam display. But the improved single median filter can't meet the request of system, so by combining of Laplacian and Gauss arithmetic the paper adopts LOG filter, which filters twice and satisfies the request of filter; Meanwhile, several methods of edge detection are introduced to compare in terms of speed and effect in weld seam image processing, then Roberts operator is selected as operator of system image edge detection, experimentation shows good effect.(3) On the basis of image processing, Hough transformation can not satisfy with the requests of the system. Aim at its insufficiency, improved it on and is putted forward to recognize eigenvalues. And then we analyse the control process and diversion coordinate, then by using slope method checking the...