Autonomous robot calibration using vision technology
Robotics and Computer-Integrated Manufacturing
Image-based Visual Servoing of a Gough—Stewart Parallel Manipulator using Leg Observations
International Journal of Robotics Research
ICIRA '08 Proceedings of the First International Conference on Intelligent Robotics and Applications: Part I
A novel XY-Theta precision table and a geometric procedure for its kinematic calibration
Robotics and Computer-Integrated Manufacturing
Online robot calibration based on vision measurement
Robotics and Computer-Integrated Manufacturing
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In this paper, a novel approach is proposed for the kinematic calibration of parallel mechanisms with linear actuators at the base. The originality of the approach lies in the observation of the mechanism legs with a camera, without any mechanism modification. The calibration can hence be achieved online, as no calibration device is linked to the end-effector, on any mechanism since no additional proprioceptive sensor installation is necessary. Because of the conditions of leg observability, several camera locations may be needed during the experimentation. The associated calibration method does not however require any accurate knowledge of the successive camera positions. The experimental procedure is therefore easy to perform. The method is developed theoretically in the context of mechanisms with legs linearly actuated at the base, giving the necessary conditions of identifiability. Application to an I4 mechanism is achieved with experimental results.