Adaptive Image-based Positioning of RCM Mechanisms Using Angle and Distance Features
Refereed conference paper presented and published in conference proceedings

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AbstractIn this paper, we address the positioning problem of remote centre of motion (RCM) mechanisms with uncalibrated image feedback from a monocular camera. Nowadays, RCM mechanisms are widely used in minimally invasive robotic surgery due to their ability to distally rotate a tool around a fixed entry port; note that in most surgical applications, the tools are typically controlled by manual/teleoperated motion commands given by a human user. In this paper, we depart from the traditional manual control scheme and derive sensor-based methods to automatically position the manipulated tool using real-time image feedback. To this end, we first characterise the mechanism's 3-DOF configuration with the angle of the image projected tool and scalar distances between feature points. To cope with uncertainty in the camera's calibration parameters, we propose two gradient descent estimators that adaptively compute the unknown Jacobian matrix; the stability of these algorithms is proved with Lyapunov theory. Finally, we derive a kinematic image-based controller and evaluate its performance with several positioning experiments.
All Author(s) ListNavarro-Alarcon D, Yip HM, Wang ZR, Liu YH, Lin WY, Li P
Name of ConferenceIEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)
Start Date of Conference28/09/2015
End Date of Conference02/10/2015
Place of ConferenceHamburg
Country/Region of ConferenceGermany
Pages5403 - 5409
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesComputer Science; Computer Science, Artificial Intelligence; Robotics

Last updated on 2020-25-11 at 03:02