Alignment Method of an Axis Based on Camera Calibration in a Rotating Optical Measurement System
Alignment Method of an Axis Based on Camera Calibration in a Rotating Optical Measurement System
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DOI：
10.3390/app10196962
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发表时间：
2020-10
期刊：
影响因子：
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通讯作者：
Yanli Hou;X. Su;Wenjing Chen
中科院分区：
文献类型：
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作者：
Yanli Hou;X. Su;Wenjing Chen
讨论了由电荷耦合器件（CCD）相机和转台组成的旋转光学测量系统的对准问题。建立随旋转装置旋转的相机光学中心（或计算机视觉中的投影中心）的运动轨迹模型。提出了一种基于二维目标的相机标定方法来计算转台旋转相机时的光心位置。引入辅助坐标系来调整相机的外参数矩阵，将光学中心映射到一个特殊的虚拟平面上。通过最小二乘平面圆拟合法可以准确计算出转台中心以及光学中心与旋转中心之间的距离。最后，旋转中心和光学中心的坐标用于为旋转测量系统中相机的安装提供指导。仿真和实验验证了该方法的可行性。
The alignment problem of a rotating optical measurement system composed of a charge-coupled device (CCD) camera and a turntable is discussed. The motion trajectory model of the optical center (or projection center in the computer vision) of a camera rotating with the rotating device is established. A method based on camera calibration with a two-dimensional target is proposed to calculate the positions of the optical center when the camera is rotated by the turntable. An auxiliary coordinate system is introduced to adjust the external parameter matrix of the camera to map the optical centers on a special fictitious plane. The center of the turntable and the distance between the optical center and the rotation center can be accurately calculated by the least square planar circle fitting method. Lastly, the coordinates of the rotation center and the optical centers are used to provide guidance for the installation of a camera in a rotation measurement system. Simulations and experiments verify the feasibility of the proposed method.