基于柔性平面靶标的摄像机现场标定方法  

On-spot camera calibration method based on flexible planar target

作　　者：余明浪[1] 魏振忠[2] 孙军华[2] 

机构地区：[1]成都大学工业制造学院,成都610106 [2]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《北京航空航天大学学报》2009年第3期347-350,共4页Journal of Beijing University of Aeronautics and Astronautics

基　　金：教育部新世纪优秀人才支持计划资助项目(NCET-07-0043);国家自然科学基金资助项目(50875014)

摘　　要：提出一种摄像机现场柔性平面靶标标定方法.该方法仅需在平面靶标上设置少量空间三维坐标已知特征点.在这些特征点中,任意共线的特征点可以确定一条直线,因此可以确定若干条直线.根据在透视投影变换下,直线和直线的交点均为不变量的性质,可获得除已知特征点之外的大量标定特征点用于摄像机标定.基于误差传播理论,对标定点的不确定度进行了详细分析.采用研制的尺寸为100 mm×100 mm,加工精度为0.01 mm的柔性平面靶标,对摄像机进行了现场标定实验,获得了0.032mm的标定精度.A flexible planar target method was proposed to perform on-spot camera calibration. In this method, only several characteristic points with known 3D coordinates are needed to be preset on the planar target, and among these preset characteristic points, the ones which are collinear could determine a straight line, so a number of straight lines can be determined. Furthermore, under the perspective projecting transformation, striaight line and the intersection point of two straight lines are invariables. So, based on the above mentioned properties, a great amount of points which differ from the preset characteristic points on the planar target can be obtained for on-spot camera calibration. Detailed error analysis of the obtained calibration points was conducted based on error propagation law. A real flexible planar target, which is of the size of 100 mm × 100 mm and the accuracy of 0.01 mm, was made to perform the experiments of on-spot camera calibration, and the calibration accuracy is 0. 032 mm.

关 键 词：摄像机标定 平面靶标 柔性 不确定度 

分 类 号：TN215[电子电信—物理电子学]