基于非线性样条插值的大广角相机畸变校正方法  

Distortion correction method for cameras with wide-angle lens based on nonlinear spline interpolation

作　　者：李银国[1] 程诚 LI Yinguo;CHENG Cheng(Center for Automotive Electronics and Embedded System,College of Automation,Chongqing University of Posts and Telecommunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学自动化学院汽车电子与嵌入式系统研究所,重庆400065

出　　处：《智能系统学报》2020年第6期1033-1039,共7页CAAI Transactions on Intelligent Systems

基　　金：重庆市人工智能重大专项(cstc2017rgzn-zdyfX0035,cstc2017rgzn-zdyfX0014);重庆市重点产业共性关键技术创新专项(cstc2017zdcyzdyfX0004).

摘　　要：针对现有的棋盘格检测方法只能检测规则的棋盘格的问题,改进了基于生长法的棋盘格检测和匹配部分,使其能够生长出非规则的棋盘格,以增加棋盘内角点数据。针对目前大广角相机广角方向及复杂镜片的畸变校正方法存在精确性问题,提出了使用薄板样条(thin-plate spline)和双简谐(biharmonic)插值算法来解决畸变的方法。该方法通过散乱的多个数据点进行控制,使其趋近数据点目标值,从而拟合出映射曲面达到去畸变的目的。实验结果证明了该方法的可行性和鲁棒性,提高了复杂畸变和广角相机畸变在广角方向上的校正精度。Chessboard detection and corner extraction are imperative during the camera calibration process,which is a fundamental work in computer vision.The existing chessboard detection algorithm can only detect the standard chessboard and the chessboard matching and has distortion problems.Here,detection part based on the growth method is improved to generate a non-regular chessboard,so as to increase the data of chessboard points.Aiming to improve the accuracy of distortion correction of wide-angle lens(cameras)in the wide-angle direction and complex distortion of glasses,we propose a new nonlinear method that uses the interpolation of thin-plate spline interpolation and biharmonic equation to solve the distortion problems.In this method,scattered data points are controlled to approach the desired target values of data point,and thereby,the mapping surface is fitted to correct distortion.Experimental results show that the method is feasible and robust,improving the correction accuracy of complex distortion and wide-angle distortion in wide-angle cameras.

关 键 词：大广角相机畸变 复杂镜片畸变 生长法检测 相机标定 畸变校正 曲面拟合 薄板样条插值 Biharmonic插值 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]