立体Scheimpflug相机标定及极线校正方法

Calibration and Epipolar Rectification Methods for Stereo Scheimpflug Cameras

针对立体Scheimpflug相机成像系统,研究了内外参数标定及极线校正方法。在立体Scheimpflug相机成像的对极几何基础上,提出了一种鲁棒的逐级标定方法,并根据内外参数标定结果构建了立体Scheimpflug相机极线校正模型。进一步建立了基于立体Scheimpflug相机的三维数字图像相关(DIC)变形测量系统。实际测量实验结果显示,三维DIC变形测量系统的精度优于10μm,说明提出的立体Scheimpflug相机逐级标定及极线校正方法正确有效,精度可靠。

Aiming at the stereo imaging system with Scheimpflug cameras,the calibration and epipolar rectification methods are investigated in this paper.The epipolar geometry of stereo Scheimpflug cameras is described,on the basis of which a robust and effective stepwise calibration method is proposed.Based on the calibration results of intrinsic and extrinsic parameters,the epipolar rectification model of stereo Scheimpflug cameras is presented.Furthermore,a threedimensional digital image correlation(DIC)deformation measurement system is developed based on Scheimpflug cameras.The experimental results show that the accuracy of the three-dimensional DIC deformation measurement system is superior to 10μm,which demonstrates the effectiveness and accuracy of the stepwise calibration and epipolar rectification of proposed stereo Scheimpflug cameras.