The curved surface visualization of the expert behavior for skill transfer using Microsoft Kinect

Method of teaching and inheriting for skill is almost oral. It is not quantitative but qualitative. Quantitative inheriting of skill is difficult. In this paper, after tracking of a subject´s skill motion using Microsoft Kinect, a subject´s motion is visualized as the curved surface. A curved surface is fitted in the positions of a subject´s joint, or the direction of trajectories. Expert and beginner perform swimming and karate motion. After the motions are tracked, the trajectories of joints are transformed to a curved surface. The difference of an action between an expert and a beginner is extracted by investigating curvatures and form on the visualized curved surface. Therefore, we expected that technical skill is transferred easily.