19 January 1993 Passive optical computerized tracking system with graphic replay
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The system has been designed for instant sports replay. The passive unit utilizes two video cameras, an image processor, and a graphics computer to track the baseball pitch and provide an instant graphic replay of the pitch, showing the ball's trajectory, speed, and movement. Shown on the 1991 World Series, it has applications for both team training and game broadcasting as well as other sports.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Donald R. Johnston, "Passive optical computerized tracking system with graphic replay", Proc. SPIE 1757, Ultrahigh- and High-Speed Photography, Videography, and Photonics, (19 January 1993); doi: 10.1117/12.139124; https://doi.org/10.1117/12.139124

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