http://www.nytimes.com/2002/03/28/technology/circuits/28HOWW.html
" PitchTrax gets 12 to 16 fixes on the ball from successive video frames, from 10 feet in front of the pitcher's mound to about 3 feet from home plate. The ball's position when it crosses the plate is extrapolated from the earlier data, Mr. Baim said. The data is available almost instantly, allowing the computer to create a broadcast-ready, 3-D reconstruction of the ball's path before a human has time to set up the video replay." -- Doug email: [EMAIL PROTECTED]
