基于機器視覺的羽毛球路徑跟蹤算法的研究及實現
[Abstract]:Badminton is a sports event with high real-time requirement. In order to realize the human-machine match of badminton robot, it is necessary to track the badminton with high speed in real-time and dynamically. The problem of tracking dynamic targets exists widely in industrial production, life and military fields, such as missile interception system and road traffic real-time monitoring system. In this paper, the binocular vision system is used to capture the badminton in the dynamic flight process, and according to the characteristics of the badminton flight, the aerodynamics model of badminton is established. The main contents of this paper are as follows: (1) three kinds of dynamic object capture algorithms in common use are analyzed and compared: background difference method, optical flow method and inter-frame difference method. The advantages and disadvantages of these three algorithms are analyzed and compared. According to the flight characteristics of badminton, a badminton dynamic capture algorithm based on three-frame difference method and optical flow algorithm is established, and its advantages and disadvantages are analyzed. (2) the aerodynamics model of badminton is established. The effects of aerodynamics and gravity on badminton flying in the air are analyzed. The main factors affecting the flight trajectory of badminton are analyzed by experiments. The steady-state flight model and spin model of badminton are established by high-speed camera. (3) in the process of badminton trajectory prediction, there are model errors and measurement errors. The maximum likelihood estimation of badminton state is calculated by Bayesian filtering. Kalman filter is a linear filter with poor estimation accuracy for nonlinear models. Two kinds of nonlinear filters, namely UKF and particle filter, are analyzed and compared. UKF is an estimation model based on Gao Si distribution sampling. Compared with Kalman filter, there is a good estimation result. Particle filter is a reasoning model based on Monte Carlo sampling, which does not need prior information of state transition and is more conducive to badminton state estimation. (4) Badminton robot system is constructed, including visual part and robot body part. The vision part makes global position correction and time synchronization of robot body. Badminton body is the execution unit of batting action. Badminton robot system is a high-speed and real-time system. A position correction model based on timestamp under high dynamic condition is established to solve the problem of decreasing position synchronization precision caused by communication delay. Set up badminton swing model and batting strategy.
【學位授予單位】:電子科技大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:G847;TP391.41
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