为了满足加工中心在机检测的实时性需求, 实现高效率、低成本、高精度地标定线结构光传感器, 提出了一种基于同心圆平面靶标标定线结构光平面参数的新方法。该方法将三点透视模型和交比不变原理相结合, 在线结构光传感器的视觉范围内通过移动同心圆平面靶标, 计算得到光平面上多组标定点的三维坐标, 进而使用最小二乘算法确定光平面方程, 通过标定和检测实验分析并验证了该方法的有效性。该方法具有标定算法简单且操作灵活方便等优点, 适合加工检测等领域的现场标定。

In order to meet the real-time demand in on-machine inspection of machining center and calibrate the parameters of line structured-light plane with high efficiency, low-cost and high precision, a calibration method of light plane was proposed based on the planar target with concentric circles. Through moving freely the planar target at several arbitrary positions in the field of the camera′s view, 3D coordinates of points on the line structured-light plane could be calculated by the calibration method integrated with the model of perspective-three-points (P3P) and the principle of cross-ratio invariance, then the equation of the line structured-light plane was fitted by least square method(LSM). Experiments showed the method′s validity and feasibility by the analysis of calibration and inspection accuracy. It concludes that the method is suitable for the machining and inspecting field calibration with advantages in its simple algorithm and the flexible calibration process.