基于消隐点的线结构光测量系统标定方法  

Calibration Method for Line Structured Light Measurement System Based on Vanishing Point

作　　者：王朝旭 伏燕军[1,2] 李晔 钟可君[1,2] 鲍伟 Wang Zhaoxu;Fu Yanjun;Li Ye;Zhong Kejun;Bao Wei(Key Laboratory of Nondestruetive Testing Technology,Ministry of Elucatiou,Nanchang Hangkong University,Nanchang,Jiangai 330063,China;School of Measuring and Optical Engineerving,Nanchang Hangkong University,Nanchang,Jianguei 330063,China)

机构地区：[1]南昌航空大学无损检测技术教育部重点实验室,江西南昌330063 [2]南昌航空大学测试与光电工程学院,江西南昌330063

出　　处：《激光与光电子学进展》2021年第22期338-346,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61661034,51765049);无损检测技术教育部重点实验室基金(EW201908087);图像处理与模式识别江西省重点实验室基金(ET201908399)。

摘　　要：针对现有线结构光测量系统标定模型复杂、需要特制靶标等局限性,提出了一种新的线结构光测量系统标定方法。利用精密导轨运载平面靶标沿着空间一个方向至少运动两次,创建一组在激光平面上的平行特征线。根据消隐点的原理,建立新的数学模型,可以标定成像像素与运动方向上一维信息的直接对应关系。改变导轨运动方向,另外两个空间正交方向上的像素-维度对应关系同样可以得到。与传统标定方法相比,所提标定方法无需标定系统多组空间关系,简化了传统标定过程,减少了误差的积累。另外,靶标可为普通平面,避免了特制靶标的制造困难。实验结果表明,所提方法测量结果均方根误差(RMSE)为0.0359 mm,平均绝对误差(MAE)为0.0306 mm,可以有效用于线结构光三维(3D)测量。Aiming at the limitations of complex calibration model and the need for special targets of the existing line structured light measurement system,a new calibration method for the line structured light measurement system is proposed.The precision guide rail is used to move the plane target at least twice in one direction in space,creating a set of parallel feature lines on the laser plane.According to the principle of vanishing point,a new mathematical model is established to calibrate the direct correspondence between the imaging pixels and the one-dimensional information in the moving direction.Changing the moving direction of the guide rail,the pixel-dimension correspondence in the other two orthogonal spatial directions can be obtained by the same way.Compared with the traditional calibration methods,the proposed calibration model does not need to calibrate multiple sets of spatial relationships of the system,which correspondingly simplifies the traditional calibration process and reduces the accumulation of errors.In addition,the target can be an ordinary plane,which avoids the difficult manufacturing of a special target.The experimental results show that the root mean square error(RMSE)of the measurement results of the proposed method is 0.0359 mm,the mean absolute error(MAE)is 0.0306 mm,which can be efficiently used for line structured light three-dimensional(3D)measurement.

关 键 词：测量 线结构光 系统标定 特征线 消隐点 

分 类 号：TN29[电子电信—物理电子学] TH711[机械工程—测试计量技术及仪器]