Contents 1 Introduction
The actions at the time of dances, sports, and engineering are different greatly to an expert and a beginner. However, methods of teaching and inheriting for skill is almost oral. It is not quantitative but qualitative. Quantitative inheriting of skill is difficult. In the case of sports, the experts express in abstract languages, such as onomatopoeia, or metaphor of an object image. However, they can't teach or inherit exactly and quantitatively. In the case of engineering [Takeo and Natsu, 2011], the experts can't express a motion of fingertips and arms orally in technical parts, such as machine tool operation. Then, after seeing an expert's operation, the beginner trains by performing imitated the operation. In addition, the inheritance is impossible when experts leave suddenly. Moreover, since quantitative evaluation cannot be performed, the same motion is not always repeated. Then, an expert's motion is captured by video camera photography, and the motions are analysed in research or software [Cheung, Baker and Kanade, 2003], [Sigal and Black, 2006]. The method is the motion capture by one or more camera sets, with the background subtraction technique, extracts a human's outline and displays only a human's motion. The motion can be preserved, and the reproducibility is high. However the extraction of human position is difficult, and quantitative evaluation is limited or no meaning. Furthermore, in order that motion capture may require large scale equipment, the possible capture place is restricted in many cases. By forcing marker wearing on a subject, we can hardly expect to track the usual motion.
