Techniques for Calibration of the Scale Factor and Image Center for High Accuracy 3-D Machine Vision Metrology
Techniques for Calibration of the Scale Factor and Image Center for High Accuracy 3-D Machine Vision Metrology
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DOI：
10.1109/34.6781
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发表时间：
1988-09
期刊：
影响因子：
--
通讯作者：
R. Lenz;R. Tsai
中科院分区：
文献类型：
--
作者：
R. Lenz;R. Tsai
描述了用于机器视觉标定某些固有相机参数的技术。需要标定的参数是水平尺度因子和图像中心。尺度因子校正采用一维快速傅立叶变换，精度高、效率高。它还允许仅使用一个共面校准点集进行一般摄像机校准。提出了三组中心校准技术：第一组需要使用激光和四自由度调整其方向，但概念最简单，精度高，可重复性好；第二组操作简单，但准确性低于其他两组；而最通用的第二组，精度高，效率高，但需要良好的定标板和准确的定标点图像特征提取。对于机器视觉应用，推荐使用II组。给出了实验结果，并与理论预测进行了比较。报告了校准参数的准确性和重复性，以及中心校准对实际三维测量的改善。>
Techniques are described for calibrating certain intrinsic camera parameters for machine vision. The parameters to be calibrated are the horizontal scale factor, and the image center. The scale factor calibration uses a one-dimensional fast Fourier transform and is accurate and efficient. It also permits the use of only one coplanar set of calibration points for general camera calibration. Three groups of techniques for center calibration are presented: Group I requires using a laser and a four-degree-of-freedom adjustment of its orientation, but is simplest in concept and is accurate and reproducible; Group II is simple to perform, but is less accurate than the other two; and the most general, Group II, is accurate and efficient, but requires a good calibration plate and accurate image feature extraction of calibration points. Group II is recommended most highly for machine vision applications. Results of experiments are presented and compared with theoretical predictions. Accuracy and reproducibility of the calibrated parameters are reported, as well as the improvement in actual 3-D measurement due to center calibration. >