Analysis of alpine skiing technique by using a 3D motion analysis from 2D video based on 3DCAD model matching

Abstract

Japanese alpine ski racer has not won the medal in the Olympic Game for over half a century. This study aimed at building a novel ski technique that can improve the results of Japanese alpine ski racer. This paper focused on the angle formed by knee and ski board of ski racer in the turn motion, and clarified a turn technique to shorten the finish time by introducing a 3D motion analysis from 2D video based on 3DCAD model matching. As the result, the knee of top level alpine ski racer turned to the inside direction with respect to the ski board during the turn motion compared to not top level alpine ski racer. In addition, we clarified that this turn technique, which is the internal rotation motion of knee, had correlation with other ski skills, which are joint work and leg lean angle.