摘要
为满足深空探测全景相机的高精度标定要求,针对大型室外三维标定靶标构建困难、不能现场标定,平面棋盘靶标标定精度不高等问题,提出了一种基于圆形标志点的相机标定方法。大量圆形标志点按矩阵形式均匀分布在平面靶标上,以其中一个圆形标志点为原点建立世界坐标系。基于相机成像模型及物点、相机原点、像点的共线性约束,以投影误差最小作为目标函数,采用非线性优化方法得到了相机参数的最优解。标定实验结果显示所提标定方法可行、有效,具有较高的标定精度和较好的稳健性,相机参数的标定精度优于0.3pixel;采用的畸变模型合适,标志点投影误差优于0.07pixel。
Considering the difficulties in construction and on-site processing of outdoor three-dementional calibration target, and the low precision of chessboard target, a new camera calibration method based on circular markers is put forward to meet the high-precision of panoramic camera for deep space explorations. A large number of circular markers are distributed on the target in matrix form, one of which is taken as the origin of world coordinate system. Based on the camera model and collinearity of object point, camera origin, and image point, the optimal camera parameters are obtained with nonlinear optimization method, which use minimizing projection error as objective function. Experimental results show that this method with higher precision and better robustness is feasible and effective. The accuracy is better than 0.3 pixel. The distortion model is suitable and the projection error is better than 0.07 pixel.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第11期139-145,共7页
Acta Optica Sinica
基金
国家重大专项(探月工程)
国家自然科学基金(11273037)
关键词
机器视觉
相机标定
圆形标志点
全景相机
平面靶标
镜头畸变
machine vision
camera calibration
circular marker
panoramic camera
planar target
lens distortion
