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1. (WO2001041884) VIDEO PROCESSOR SYSTEMS FOR BALL TRACKING IN BALL GAMES

Pub. No.:    WO/2001/041884    International Application No.:    PCT/GB2000/004507
Publication Date: Fri Jun 15 01:59:59 CEST 2001 International Filing Date: Wed Nov 29 00:59:59 CET 2000
IPC: A63B 69/00
A63B 71/06
G01S 3/786
Applicants: ROKE MANOR RESEARCH LIMITED
SHERRY, David
HAWKINS, Paul
Inventors: SHERRY, David
HAWKINS, Paul
Title: VIDEO PROCESSOR SYSTEMS FOR BALL TRACKING IN BALL GAMES
Abstract:
A video processing system for use in ball games played within a predetermined area on a pitch or the like such as cricket, comprising at least four video cameras arranged in spaced apart relationship at fixed positions around the said area, a video processor and ball tracker to which signals from the cameras are fed, a data store for date which models the said area and includes data representative of characteristic features positioned thereon for use in performance of the game, and a store for data appertaining to rules and/or key events of the ball game played, the video processor being operative to; (a) identify in each frame, from each camera, groups of pixels corresponding to the image of a ball; (b) compute for each frame the 3D position of an image thus identified using ball image data from at least two different cameras; (c) predict a ball flight-path from the said 3D ball position as computed in successive frames; and, (d) map the predicted flight-path on the modelled area so as to identify any interaction with one or more of the said characteristic features, which interaction signifies the occurrence of a key event or a rule infringement.