Abstract
We present a method allowing a quadrotor equipped with only onboard cameras and an IMU to catch a flying ball. Our system runs without any external infrastructure and with reasonable computational complexity. Central to our approach is an online monocular vision-based ball trajectory estimator that recovers and predicts the 3-D motion of a flying ball using only noisy 2-D observations. Our method eliminates the need for direct range sensing via stereo correspondences, making it robust against noisy or erroneous measurements. Our system is made by a simple 2-D visual ball tracker, a UKF-based state estimator that fuses optical flow and inertial data, and a nonlinear tracking controller. We perform extensive analysis on system performance by studying both the system dynamics and ball trajectory estimation accuracy. Through online experiments, we show the first mid-air interception of a flying ball with an aerial robot using only onboard sensors.
The authors would like to thank the scholarship and equipment support from DJI.
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Su, K., Shen, S. (2017). Catching a Flying Ball with a Vision-Based Quadrotor. In: Kulić, D., Nakamura, Y., Khatib, O., Venture, G. (eds) 2016 International Symposium on Experimental Robotics. ISER 2016. Springer Proceedings in Advanced Robotics, vol 1. Springer, Cham. https://doi.org/10.1007/978-3-319-50115-4_48
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DOI: https://doi.org/10.1007/978-3-319-50115-4_48
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