To demonstrate the principle of a breaking pitch during a ball game, we have developed an image processing system for a pitched ball during its transit. This system can detect the rotational speed and the orientation of rotational axis of a ball from images taken by a high-speed video camera. These images are taken at a frame rate of 200 fps or 1000 fps with a shutter speed of 1/2000 s or 1/5000 s, and the ball's
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