About gesture recognition, a number of frameworks for
designing gestures are proposed [3][4]. Zhenyao et al. focused
on the shape of a hand to define overlap-less gestures
[3]. Chen et al. proposed the gestures for operate a 2D
content instead of buttons [4]. Avrahami et al. propose a special
(creator defined) curve by a finger to call a function [5].
To support a large number of functions, Wobbrock et al. propose
a method detecting gestures based on the combination
of the motions of fingers with a multi touch device [6]. However,
all of the gestures are fixed on the 2D coordinate because
the 2D contents do not change their shapes depending on the
viewing direction.