During the capture operation, the hand-eye camera measures the spatial position of the center of the docking ring. However, the center can’t be used as a direct capture point, so we need to find a suitable capture point on the docking ring. This point can be connected with the center of the docking ring while satisfying the capture of the manipulator. This paper presents a method to find the capture point based on the intersection of the circle and a straight line, consisting of the image main point and the center of the circle. Furthermore, an algorithm for calculating the spatial position of the capture point is proposed. The digital and semi-physical simulation experiments verify the effectiveness of the method. The results show the position error of the capture point is within 0.8mm, and the capture angle error is within 0.4°.
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