Abstract
To make clear the principle of a breaking pitching of baseball, we have developed a image processing system of pitching ball. This system can detect a rotation speed and a direction of rotation axis of ball from images taken by a high-speed video camera. These images were taken at frame rate of 500 or 1000fps and shutter speed of 1/2000 or 1/5000s. The velocity of ball was determined by its position in 6 continuous flames. The rotation speed and axis of rotation were determined from the pattern of seam. The pitching balls of test pitchers were analyzed by the present system, and discussed. The present system will be used in an analysis of the pitching ball, a training of pitcher, a development of new breaking pitching and so on.
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