Abstract
The three dimensional extent where a thumb tip can reach is closely related to functions that can he performed by the thumb. However, on the hand and finger rehabilitation, range of motion for each finger joint is used for evaluating the current state of the hand. It requires a therapist to measure the ranges. In addition, it is difficult to evaluate the three dimensional extent of motion from the ranges. We propose a method to automatically estimate three dimensional position of the thumb tip with a contactless depth sensor. To evaluate the relative position to the palm, we also propose a method to estimate three dimensional configuration of the palm. With experiments, we show the effectiveness of the proposed method.
