Gopal Sarma Pingali Agata Opalach Yves Jean Ball Tracking and Virtual Replays for Innovative Tennis Broadcasts. 4152-4156 2000 ICPR http://csdl.computer.org/comp/proceedings/icpr/2000/0750/04/07504152abs.htm db/conf/icpr/icpr2000-4.html#PingaliOJ00