Abstract: Marking for feature points is the key task to realize camera calibration. Aiming at the circle array target without special mark and structure, a new automatic marking method is presented in this paper. This method uses three special feature points of the ellipse array in the projective image of target to establish the target coordinate system and determine the direction of target, then the topological positions of feature points are marked by mapping between the image coordinate system and the target coordinate system. Experimental results demonstrate that the proposed method  works  accurately and  steadily, moreover, it is easy to implement and has strong generality and high efficiency.

Key words: target, circle array, automatic marking, vision measurement

摘要： 特征点标记是实现摄像机标定的一个关键环节。针对无特殊标志和结构要求的一般圆阵列靶标，提出了一种快速的特征点标记方法。该方法利用靶标投影图像中的椭圆阵列的三个特殊特征点建立靶标坐标系，确定靶标方向，进而依据图像坐标系与靶标坐标系之间的映射关系实现对特征点的拓扑定位和标记。实验结果表明，该方法定位准确、稳定可靠，且实现简单，具有较强的通用性和很高的效率。

关键词: 平面靶标, 圆阵列, 自动标记, 视觉检测