关键词: 机器视觉, 几何基元, 多边形近似, 匹配定位

Abstract: In order to achieve real-time positioning of the workpiece in the industrial processes, this paper  proposes a real-time location and matching method for the workpiece with circular geometric primitives. In the offline process, it uses the polygonal approximation method to approximate the edge contour image, and further divides it into segments as line primitives and arc primitives. Templates are created. And it determines the position and orientation of the workpiece. In the online process, the longest circular arc is examined first; with it the template is transformed to the image. The primitives can be matched to the image based on the distances of the image primitives and the transformed template primitives. Tests show that this method for circular geometry primitives of the workpiece, in the case of occlusion, can quickly and accurately perform real-time matching location.

Key words: machine vision, geometric primitives, polygonal approximation, positioning and matching