一维摄像机的线结构光测头标定方法  

Calibration Method of Line Structure Optical Probe for One-dimensional Camera

作　　者：周涛 高承帅 王建 聂潇乾 王炳琪 吴彬彬 Zhou Tao;Gao Chengshuai;Wang Jian;Nie Xiaoqian;Wang Bingqi;Wu Binbin(Shanghai Radio Equipment Research Institute,Shanghai 200090,China)

机构地区：[1]上海无线电设备研究所,上海200090

出　　处：《机电工程技术》2024年第7期83-86,共4页Mechanical & Electrical Engineering Technology

基　　金：工信部自然灾害防治技术装备工程化攻关专项项目(TC210H00L/43);上海市科技创新行动计划项目(20511106700);上海市科技兴农项目(沪农科创字2020第3-2号);上海市产业协同创新发展项目(HCXBCY-2023-028、XTCX-KJ-2023-50、HCXBCY-2021-010)。

摘　　要：为了解决传统的线结构光标定过程步骤繁琐并且准确度不足的问题,提出了把线结构光的光刀平面建立模型为一维摄像机的测头标定方法。首先从线结构光的光条中心提取坐标信息,并计算其在标定靶上的位置坐标,接着依据至少两组姿势下的光条中心的三维坐标点来建立拟合平面方程,最后构建虚拟一维摄像机来表示光刀平面。通过进行迭代摄像机标定和线结构光测头标定,再结合三角测量技术,可获得在立体视觉模型中的被测物的三维点云数据坐标。经实验测试,对两个有高低差异的量块进行了测量,重复10次标定实验,结果显示迭代摄像机标定的平均误差为0.077 220 pixel,光刀平面标定的平均误差为1.415 17 mm,这个试验表明了这种线结构光测头标定的方法有着较高精度,是可行的。In order to solve the problem of tedious steps and insufficient accuracy in the traditional line structure cursor determination process,the optical knife plane of line structure light is proposed as the measuring head calibration method of one-dimensional camera.First,the coordinate information is extracted from the light bar center of line structure light and its position coordinates are calculated on the calibration target.Then,the fitting plane equation is established according to the three-dimensional coordinate points of the light bar center under at least two groups of gestures.Finally,a virtual one-dimensional camera is constructed to represent the optical knife plane.By iterative camera calibration and line structure light probe calibration,and combined with triangulation technology,the three-dimensional point cloud data coordinates of the measured object in the stereoscopic model can be obtained.Two measuring blocks with high and low difference are measured,and the calibration experiment is repeated for 10 times.The results show that the average error of iterative camera calibration is0.077 220 pixel,and the average error of optical knife plane calibration is 1.415 17 mm.This experiment shows that this linear structure optical probe calibration method has high accuracy and it is feasible.

关 键 词：线结构光 测头标定 光条中心 光刀平面 

分 类 号：TG83[金属学及工艺—公差测量技术]