基于单目相机的光热支架连接板双孔形位检测方法
2021-02-24
作者:程浩刚,龚俊,宁会峰,张雪峰,王一超
单位:兰州理工大学机电工程学院
摘要:针对槽式太阳能集热支架镜面连接板上的双孔进行形位检测,提出了一种基于单目相机检测方法。该方法利用单目相机分别对镜面连接板上的两个孔进行正位拍摄,并分别提取孔上下边缘的轮廓及圆心坐标,求出孔的位置度误差,利用“近大远小”的透视原理实现对孔的倾斜度检测。对于正位拍摄中相机光轴与孔心不重合引起的系统误差,利用相机拍摄标准块以确定孔心坐标标准块的标定方法,对加工孔的坐标进行矫正。
关键词:单目相机;透视原理;双孔零件;图像处理;形位检测
中图分类号: TG806;TG839;TH741文献标志码:ADOI:10.3969/j.issn.1000-7008.2021.02.022
Method for Detecting Shape and Position of Double Holes of Photothermal
Support Connecting Plate Based on Monocular Camera
Cheng Haogang,Gong Jun,Ning Huifeng,Zhang Xuefeng,Wang Yichao
Abstract:Aimed at the shape and position detection of the double holes in the mirror connecting plate of the trough-type solar collector support,a detection method based on monocular camera is proposed.In this method,the monocular camera is first used to shoot the two holes in the mirror connecting plate in a positive position,and then the contour and the center coordinates of the upper and lower edges of the holes are extracted respectively,and the position error of the holes is calculated.In the meantime,the perspective principle of near big and far small is also used to detect the inclination of the hole.For the system error caused by the inconsistency between the optical axis of the camera and the center of the hole,the method of standard block calibration to determine the coordinates of the hole center through camera shooting is used to correct the coordinates of the machined hole.
Keywords:monocular camera;perspective principle;double hole part;image processing;shape and position detection