A21 The spin on a baseball in eight different pitches by a professional pitcher
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- Nagami T.
- Waseda Univ.
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- Kanosue K.
- Waseda Univ.
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- Morohosi J.
- Waseda Univ.
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- Omuro K.
- Waseda Univ.
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- Chagawa T.
- Waseda Univ.
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- Katsumata Y.
- Waseda Univ.
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- Ujihara Y.
- Saitama Univ.
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- Koyasu H.
- Saitama Univ.
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- Maekawa H.
- Saitama Univ.
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- Komiyama S.
- Chiba Lotte Marines
Bibliographic Information
- Other Title
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- A21 一人のプロ野球投手が投げる8種類の投球のボール回転(野球2)
- 一人のプロ野球投手が投げる8種類の投球のボール回転
- ヒトリ ノ プロ ヤキュウ トウシュ ガ ナゲル 8シュルイ ノ トウキュウ ノ ボール カイテン
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Abstract
The authors have recently developed a system for analyzing the spin on a baseball (Koseki et al., 2007). In the present study we analyzed the spin pitched by a professional pitcher. He pitched eight different pitches, each twice, from official pitching mound. The image of ball in the period from just before to 500 ms after the ball release was taken with a high speed video camera at 1000 fps. English alphabets E, M, A, and I were marked on the ball for image processing. Feature points from the image stream were assembled into a set of linear equations that represents orientation change between consecutive two frames by rotation matrix R, and the direction of spin axis and spin rate were obtained. Both values varied considerably depending on pitches. The recording of spin was suggested to be valuable for training if the data could be combined with those of motion analysis.
Journal
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- The Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics
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The Proceedings of Joint Symposium: Symposium on Sports Engineering, Symposium on Human Dynamics 2008 (0), 108-111, 2008
The Japan Society of Mechanical Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390282681045483520
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- NII Article ID
- 110007705551
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- NII Book ID
- AA11902376
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- ISSN
- 24331309
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- NDL BIB ID
- 10431446
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed