Estimation of Bowing Angle for Ritsurei Teaching System using Human Body Contour and Local Features

Abstract

In Japan, we frequently bow to various people in daily life. Therefore, we should acquire the polite ritsurei so that we don't give the other party the unpleasant. The goal of the research is development of ritsurei teaching system which is composed of ritsurei evaluation phase and user teaching phase. The ritsurei evaluation phase evaluates ritsurei based on position of human body as back of the head, the back, and the waist. However, it is difficult to track these positions. Because back of the head, the back, and waist have little characteristic pattern. In this paper, we estimate bowing angle by tracking relative movements of local features on human body contour. Experimental results have shown that the proposed method has increased estimation accuracy of angle by 40% compared with the system which tracks back of the head, the back, and the waist without contour of human body. In addition, identification accuracy of proposed system has been equal to identification accuracy of marker tracking system.