激光技术, 2013, 37 (2): 227, 网络出版: 2013-03-27
坐标测量机上红宝石轴承视觉自动定位系统
Vision automatic positioning system of ruby bearing in a coordinate measuring machine
图像处理 自动定位 轮廓跟踪 红宝石轴承 相机标定 image processing automatic positioning contour tracking ruby bearing camera calibration
摘要
坐标测量机中传统的间接定位方法对微小特征定位不够精确, 为了提高微小特征的定位精度, 采用机器视觉技术对微小特征本身直接定位的方法, 进行了理论分析和实验验证。根据红宝石轴承材料的光学特性, 设计了视觉自动定位系统, 通过图像算法提取轴承内孔的图像中心, 并使用测量机的测针端部作为靶标对相机进行标定, 取得了相机图像坐标系与测量机坐标系的转换系数数据。结果表明, 该系统的定位精度达到0.01mm, 这一结果对提高微小特征的定位精度是有帮助的。
Abstract
To improve the positioning accuracy of small objects, a direct positioning scheme was proposed based on machine vision. Besides, relevant theoretical analysis and experimental verification were carried out. By analyzing the optical features of ruby bearings, a vision automatic positioning system was designed, and image algorithms were used to get the center of the hole. The top of the probe on coordinate measuring machine was used as an ideal target for camera calibration, so the coefficients of coordinate transformation between camera system and the coordinate measuring machine was calculated. Experiments show that the positioning accuracy of the system is up to 0.01mm, which fulfills the requirement of positioning.
王星, 李醒飞, 黄健, 黎春宇, 谭文斌, 陈诚. 坐标测量机上红宝石轴承视觉自动定位系统[J]. 激光技术, 2013, 37(2): 227. WANG Xing, LI Xing-fei, HUANG Jian, LI Chun-yu, TAN Wen-bin, CHEN Cheng. Vision automatic positioning system of ruby bearing in a coordinate measuring machine[J]. Laser Technology, 2013, 37(2): 227.