Motion data acquisition method for motion analysis in golf

Abstract

SummaryAs golf becomes more popular, interest in the analysis and correction of golf swing postures increases. Thus, various methods for analyzing the golf swing have been studied. Methods have recently been extended to 3D analysis systems, using motion capture technology beyond 2D analysis using cameras. The inertial sensor is one of the sensors used in 3D analysis. It is mainly used in the motion capture system, because it is cheap and has negligible space limitations. However, the motion capture system using the inertial sensor has some disadvantages in that it cannot identify body characteristics, such as joint length or the subject's initial direction, which are required to accurately analyze the swing data of the subject in golf, where the initial posture is important. This study proposes a system that obtains the same motion as the actual one by acquiring information on the motion of the subject using 15 inertial sensors and using information on the actual joint length and initial direction of the subject extracted from a depth camera. Experimental results show that the measurement error of information on the joint length and the foot stance of subjects extracted through the depth camera ranges from a minimum of 4.4% to a maximum of 6.94%. The acquired motion data from the proposed system confirms that the motion is the same as the one taken by the subject.