We
implement
ed
a
system
visualizing
motion
and trajectory
of
a target
in quasi
-
3d form and
obtained
useful
information
from
motion and
trajectory of
a
ir
bounce
backhand
in ultimate
.
This paper show
s that our
system
i
s useful for
athle
tes
when they look back their
throws
and
trajectories of flying
disk
.