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SCIENCE CHINA Information Sciences, Volume 59, Issue 9: 092208(2016) https://doi.org/10.1007/s11432-015-5497-1

Precise planar motion measurement of a swimming multi-joint robotic fish

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  • ReceivedMay 17, 2015
  • AcceptedSep 6, 2015
  • PublishedAug 23, 2016

Abstract

This paper presents a method for planar motion measurement of a swimming multi-joint robotic fish. The motion of the robotic fish is captured via image sequences and a proposed tracking scheme is employed to continuously detect and track the robotic fish. The tracking scheme initially acquires a rough scope of the robotic fish and thereafter precisely locates it. Historical motion information is utilized to determine the rough scope, which can speed up the tracking process and avoid possible ambient interference. A combination of adaptive bilateral filtering and k-means clustering is then applied to segment out color markers accurately. The pose of the robotic fish is calculated in accordance with the centers of these markers. Further, we address the problem of time synchronization between the on-board motion control system of the robotic fish and the motion measurement system. To the best of our knowledge, this problem has not been tackled in previous research on robotic fish. With information about both the multi-link structure and motion law of the robotic fish, we convert the problem to a nonlinear optimization problem, which we then solve using the particle swarm optimization (PSO) algorithm. Further, smoothing splines are adopted to fit curves of poses versus time, in order to obtain a continuous motion state and alleviate the impact of noise. Velocity is acquired via a temporal derivative operation. The results of experiments conducted verify the efficacy of the proposed method.


Funded by

National Natural Science Foundation of China(61333016)

National Natural Science Foundation of China(61421004)

State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(LAPS16006)

Beijing Natural Science Foundation(3141002)

National Natural Science Foundation of China(61375102)


Acknowledgment

Acknowledgments

This work was supported by National Natural Science Foundation of China (Grant Nos. 61375102, 61333016, 61421004), Beijing Natural Science Foundation (Grant No. 3141002), and State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources (Grant No. LAPS16006).


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