面向近景工业摄影测量的分层式相机标定方法  

A layered camera calibration method for close range industrial photogrammetry

作　　者：李云雷[1] 隋文涛[1] 王建军[1] 李长安 LI Yunlei;SUI Wentao;WANG Jianjun;LI Changan(School of Mechanical Engineering,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学机械工程学院,山东淄博255000

出　　处：《光学技术》2022年第5期610-615,共6页Optical Technique

基　　金：山东省自然科学基金(ZR2021ME160)。

摘　　要：针对近景工业摄影测量中镜头自动对焦导致相机内参数波动进而降低测量精度的问题,提出一种分层式相机标定方法。分析了基于平面棋盘格的相机标定技术,阐述了数码单反相机的自动对焦原理及其如何影响相机主距的变化,重点分析了分层式相机标定方法的基本思想。分层式相机标定实验揭示了相机内参数及畸变系数随着标定距离变化的规律,精度评价实验的结果表明,依据摄影距离选择合适的相机内参数能够显著提高近景工业摄影测量的精度。In close range industrial photogrammetry, the automatic focusing of lens will lead to the fluctuation of camera parameters, resulting in the reduction of measurement accuracy. In order to solve this problem, a layered camera calibration method is proposed. The camera calibration technology based on plane checkerboard is analyzed, the automatic focusing principle of digital SLR camera and how it affects the change of camera principal distance are expounded, and the basic idea of the layered camera calibration method is emphatically analyzed. The layered camera calibration experiment reveals the variation law of the camera internal parameters and distortion coefficients with the calibration distances. The result of accuracy evaluation experiment shows that selecting appropriate camera internal parameters according to the photographing distance can significantly improve the accuracy of close range industrial photogrammetry.

关 键 词：近景工业摄影测量 自动对焦 分层式相机标定 光栅尺 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TH741[自动化与计算机技术—计算机科学与技术]