Aiming at the problem of low attitude estimation accuracy of monocular visual system
a monocular visual inertial system based on semi-direct visual odometry (SVO) is proposed. The system uses an error-state Kalman filter to fuse visual information and inertial navigation information in a loosely coupled manner. SVO is used to process image data in the visual front-end
and the SVO keyframe selection strategy is modified to solve the problem of attitude estimation failure due to relocation failure in the front-view scene of the camera. The proposed algorithm is validated by using the MH 01 subset of the EuRoc dataset. The experiment shows that the monocular visual inertial system based on the SVO can effectively improve the accuracy of attitude estimation. Compared with the monocular SVO algorithm
the position error of the proposed algorithm is reduced by 13.4%
the error of the rotation angle is reduced by 30%.
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references
XIAO Y, RUAN X G, ZHU X Q, et al. Integrated navigation method of monocular SVO/INS for micro aerial vehicles[J]. Journal of Chinese Inertial Technology, 2019, 27(2): 211-219. DOI: 10.13695/j.cnki.12-1222/o3.2019.02.011.
FORSTER C, CARLONE L, DELLAERT F, et al. On-manifold preintegration for real-time visual-inertial odometry[J]. IEEE Transactions on Robotics, 20 17, 33( 1): 1-2 1. DOI: 10. 1 109/TRO.20 16.259732 1.
TANG L. Design and implementation of semi-direct based monocular visual odometry[D]. Chongqing: Chongqing University, 2018.
SOLÀJ. Quaternion kinematics for the error-state Kalman filter[J]. arXiv: 1711.02508, 2017.
MUR-ARTAL R, TARDO S J D. Visual-inertial monocular SLAM with map reuse[J]. IEEE Robotics and Automation Letters, 2017, 2(2): 796-803. DOI: 10.1109/LRA.2017.2653359.
QIN T, LI P L, SHEN S J. VINS-Mono: a robust and versatile monocular visual-inertial state estimator[J]. IEEE Transactions on Robotics, 2018, 34(4): 1004-1020. DOI: 10.1109/TRO.2018.2853729.
FORSTER C, PIZZOLI M, SCARAMUZZA D. SVO: Fast semi-direct monocular visual odometry[C]//2014 IEEE International Conference on Robotics and Automation (ICRA). Hong Kong, China: IEEE, 2014: 15-22. DOI: 10.1109/ICRA.2014.6906584.
YE B. Monocular visual inertial odometry for quadrotor systems[D]. Hanzhou: Zhejiang University, 2017.
CLEMENT L, KELLY J, BARFOOT T D. Monocular visual teach and repeat aided by local ground planarity[M]//WETTERGREEN D S, BARFOOT T D. Field and Service Robotics. Cham: Springer, 2016: 547-561. DOI: 10.1007/978-3-319-27702-8_36.
YANG Z F, SHEN S J. Monocular visual-inertial state estimation with online initialization and camera-IMU extrinsic calibration[J]. IEEE Transactions on Automation Science and Engineering, 2017, 14(1): 39-51. DOI: 10.1109/TASE.2016.2550621.