中文摘要：

针对平面上目标的定位及长度测量等问题，提出了一种基于单目视觉测量平面上物体位置的方法，并讨论了标定点的选取原则。在被测目标所在平面上放置平面靶标，在平面靶标上选取标定点，通过最小二乘法求取模型参数，实现单目视觉测量模型的标定。利用标定出的模型参数，根据目标的图像坐标计算出其平面坐标位置，从而实现目标的定位及长度测量。标定点个数至少为4个，并且标定点需满足特定的位置关系。实验中测得目标长度的相对误差小于0．3％，验证了该方法的有效性。

英文摘要：

Aiming at the problem about the positioning of object on plane and length measurement, a method for measuring object position on the plane based on monocular vision is proposed. The selection principle of the calibration point is discussed. A planar target is placed on the plane, the calibration points are selected in the planar target, and model parameters can be calculated using the least square method. Then the measurement model calibration is realized. The object＇s position on the plane can be calculated using its image coordinates and the measurement model parameters, and the goal of positioning and length measurement on plane is achieved. Four points at least are chosen in the planar target, and the calibration points need to meet specific position relation. The relative error of the target＇s length is less than 0.3% in the experimental result, which verifies the effectiveness of the proposed method.