In this paper, we propose a prototype of a self-training system for tennis forehand shots that allows trainees to practice their motion forms by themselves. Our system includes a motion capture device to record the trainee’s motion, and the system visualizes the differences between the features of the trainee’s motion and the correct motion performed by an expert. The system enables trainees to understand the errors in their motion and how to reduce or eliminate them. In this study, we classify the motion features and corresponding visualization methods based on the one-dimensional spatial, rotational, and temporal features of key poses. We also develop a statistical model for the motion features so that the system can assess and prioritize all features of a trainee’s motion. Related features are simultaneously visualized by analyzing their correlations. We describe the process of defining the motion features for the tennis forehand shot of an expert. We evaluated our prototype through several user experiments and demonstrated its feasibility as a self-training system.
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This work was supported in part by a Grant-in-Aid for Scientific Research (No. 15H02704) from the Japan Society for the Promotion of Science.
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Oshita, M., Inao, T., Ineno, S. et al. Development and evaluation of a self-training system for tennis shots with motion feature assessment and visualization. Vis Comput 35, 1517–1529 (2019). https://doi.org/10.1007/s00371-019-01662-1
- Training system
- Sports form
- Motion feature
- Motion capture