旋转视觉测量系统相机光心与转轴距离的标定方法  

Calibration Method of Distance Between Optical Center of Camera and Rotation Axis in Rotating Vision Measurement System

作　　者：侯艳丽 苏显渝[1] 陈文静[1] Hou Yanli;Su Xianyu;Chen Wenjing(Department of OpticElectronic,College of Electronics and Information Engineering,Sichuan University,Chengdu 610065,Sichuan,China)

机构地区：[1]四川大学电子信息学院光电系,四川成都610065

出　　处：《光学学报》2022年第21期149-159,共11页Acta Optica Sinica

基　　金：国家重大仪器设备开发专项(2013YQ490879)。

摘　　要：在应用旋转台与相机组成的旋转视觉测量系统时,为了方便后续的数据拼接,标定出相机光心与旋转轴之间的距离至关重要。提出了一种基于双目视觉原理的相机光心与转轴距离的标定方法,建立了相应的数学模型并推导出了解析表达式。利用转台带动已知内参数的相机旋转一次,拍摄两幅标靶图片,即可利用标靶图像上特征点对的物理图像坐标、对应的空间距离、旋转角和相机内参数,计算出相机光心与旋转轴之间的距离。计算机模拟和实验验证了所提方法的可行性。计算结果可用于旋转视觉测量系统的相机光心与转轴的对位,对位精度可达到0.16 mm。In the application of a rotating vision measurement system composed of a turntable and a camera,it is important to accurately calibrate the distance between the optical center of camera and the rotation axis,so as to facilitate subsequent data splicing.Therefore,a method for calibrating the distance between the optical center of camera and the rotation axis based on the principle of binocular vision is proposed,and the corresponding mathematical model is established,with the analytical expression deduced.The turntable drives the camera with known internal parameters to rotate once,and two target images are shot.Then,the distance between the optical center of camera and the rotation axis can be calculated according to the image coordinates of the feature points on the target images,their corresponding spatial distance,the rotation angle,and the internal parameters of the camera.As a result,computer simulations and experiments verify the effectiveness of the proposed method,and the calculation results can be used to align the optical center of camera with the rotation axis in the rotating vision measurement system,with an alignment accuracy of 0.16 mm.

关 键 词：测量 旋转视觉测量系统 相机标定 双目视觉 光心与转轴对准 

分 类 号：O439[机械工程—光学工程]