Analysis of Human Pointing Behavior in Vision-based Pointing Interface System - difference of two typical pointing styles -

This paper reports human pointing behaviors in vision-based pointing interface system, to make a mathematical model of them for designing easy-to-use interface. In natural pointing situations, we point targets at distant position with various postures, for example straight arm style or bent elbow style. We analyze their difference in pointing behaviors with assuming the pointing interface system as a feedback control model including an indicator. The difference had been confirmed in the step responses and the estimated parameters in the transfer functions, and matches to our actual experiences in those pointing styles. The estimation accuracy of indicated position from indicator's posture in the intermediate styles has been also analyzed. The results said that the reference point of indication smoothly moves from indicator's eye to his or her elbow according to the elbow joint angle.