光笔式视觉测量中椭圆类光斑图像的识别

Elliptical light spot image recognization in light-pen vision measurement

介绍了一种光笔式单摄像机便携三维坐标视觉测量系统。在分析该系统成像特点的基础上,提出了一种控制点椭圆形光斑图像的数字识别方法,而常用的方法是在CCD摄像机镜头上加滤光片来隔离背景干扰亮斑图像。该方法以光笔上被测控制点在摄像机CCD像平面上的光斑图像轮廓所占像素个数为基准,剔除过大和过小的图像轮廓,进而采用基于椭圆线轮廓度误差的评定方法实现控制点椭圆形光斑图像的识别。给出了该方法的具体算法,实验结果表明:该方法简单方便,易于实现,检测速度较快,适用于圆形被测控制点的视觉检测系统,具有一定的理论意义和工程实用价值。

A light-pen single camera 3D coordinate vision measurement system is introduced. On the basis of analysis of the system＇ s image characteristics, a digital recognization method, which is for recognizing the elliptical light spot images of the measured control points, is proposed. On the basis of the pixel number of a measured control point＇ elliptical light spot image contour, over large and small images contour can be eliminated. Using the method based on the evaluation for elliptical profile error, the measured control points＇ elliptical light spot image can be recognized. The algorithm for this method is given, and the experimental result shows that this algorithm is simple, fast, easy to be realized and practical for the vision inspection system of circular measured control points. It has certain theoretical significance and practical project value.