Analysis of smash motion image for badminton

Abstract

A method of analyzing a smash motion of a badminton player from an image is proposed. The proposed method is constituted by KL transformation and mapping. First, the proposed method expresses a motion of a part with the 1st, the 2nd, and the 3rd principal axes obtained by KL transform in time. Next, mapping is performed in velocity space. This proposed method roughly divides the motion of the part to the whole body into a closed loop, a curve, and a point (or a straight line). Analysis of time change of the motion is conducted. In this paper, computer simulation shows the theoretic verification result of the proposed method. Next, an experiment using an image by a Japanese elite player shows an application possibility of the proposed method. Furthermore, the method of analyzing for discovering a new motion from a motion of the sports player of international match level is considered from a viewpoint of sports science.