| 摘要 |
A T.V camera in center field beyond the playing field directed at the home plate along a main axis. The camera senses the baseball in the strike zone. A second T.V. camera directed at the home plate in direction perpendicular to the main axis, which also senses the baseball in the strike zone, but in an area between the front end limits of the home plate. The two T.V. cameras are connected in series and serve to control the scoreboard and show on the scoreboard when the baseball in its passage by the strike zone constitutes a strike.
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