Transactions of the Visualization Society of Japan
Online ISSN : 1346-5260
ISSN-L : 1346-5252
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Volume 34, Issue 4
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  • Image Processing of Rotation of Moving Balls in Sports
    Ryozo ISHIWATA, Atsuo HIRAI, Takumi IIDA
    2014 Volume 34 Issue 4 Pages 1-7
    Published: 2014
    Released on J-STAGE: April 28, 2014
    DOIhttps://doi.org/10.3154/tvsj.34.1
    JOURNAL FREE ACCESS
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      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 velocity is determined by different positions in six continuous frames. The rotational speed and axis of rotation are determined from the surface pattern of the ball. In this study, various pitching balls are analyzed by the present system, and the results are discussed. The present system will be used in analyses of pitched balls, the training of pitchers, the development of new breaking pitches etc.
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