Abstract
Controlling the spin of a ball is important in a variety of sports, especially baseball. For an athlete to properly train, it is necessary to know spin information immediately after throwing or hitting a baseball. This paper presents a fully automatic and marker-free technique to measure both the spin rate and spin axis of a pitched baseball using a consumer-grade high-speed camera. After tracking a ball from the high-speed video, our technique measures spin rate by detecting periods in which similar ball images appear, and then estimates spin axis by performing rigid registration that considers three-dimensional rotation. By separating the spin rate measurement and spin axis estimation processes, we achieve reasonable computational efficiency and robustness for small blurred baseball images extracted from video. We evaluated the accuracy of our presented technique by using synthesized videos. To illustrate the feasibility of our technique, we applied it to a variety of breaking ball pitches captured under normal outdoor lighting conditions.
| Language | English |
|---|---|
| Pages | 1-8 |
| Number of pages | 8 |
| Journal | Signal, Image and Video Processing |
| DOIs | |
| State | Accepted/In press - 2017 Feb 22 |
| Externally published | Yes |
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Keywords
- Baseball
- High-speed video
- Spin analysis
ASJC Scopus subject areas
- Signal Processing
- Electrical and Electronic Engineering
Cite this
Automatic spin measurements for pitched Baseballs via consumer-grade high-speed cameras. / Ijiri, Takashi; Nakamura, Atsushi; Hirabayashi, Akira; Sakai, Wataru; Miyazaki, Takeshi; Himeno, Ryutaro.
In: Signal, Image and Video Processing, 22.02.2017, p. 1-8.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Automatic spin measurements for pitched Baseballs via consumer-grade high-speed cameras
AU - Ijiri,Takashi
AU - Nakamura,Atsushi
AU - Hirabayashi,Akira
AU - Sakai,Wataru
AU - Miyazaki,Takeshi
AU - Himeno,Ryutaro
PY - 2017/2/22
Y1 - 2017/2/22
N2 - Controlling the spin of a ball is important in a variety of sports, especially baseball. For an athlete to properly train, it is necessary to know spin information immediately after throwing or hitting a baseball. This paper presents a fully automatic and marker-free technique to measure both the spin rate and spin axis of a pitched baseball using a consumer-grade high-speed camera. After tracking a ball from the high-speed video, our technique measures spin rate by detecting periods in which similar ball images appear, and then estimates spin axis by performing rigid registration that considers three-dimensional rotation. By separating the spin rate measurement and spin axis estimation processes, we achieve reasonable computational efficiency and robustness for small blurred baseball images extracted from video. We evaluated the accuracy of our presented technique by using synthesized videos. To illustrate the feasibility of our technique, we applied it to a variety of breaking ball pitches captured under normal outdoor lighting conditions.
AB - Controlling the spin of a ball is important in a variety of sports, especially baseball. For an athlete to properly train, it is necessary to know spin information immediately after throwing or hitting a baseball. This paper presents a fully automatic and marker-free technique to measure both the spin rate and spin axis of a pitched baseball using a consumer-grade high-speed camera. After tracking a ball from the high-speed video, our technique measures spin rate by detecting periods in which similar ball images appear, and then estimates spin axis by performing rigid registration that considers three-dimensional rotation. By separating the spin rate measurement and spin axis estimation processes, we achieve reasonable computational efficiency and robustness for small blurred baseball images extracted from video. We evaluated the accuracy of our presented technique by using synthesized videos. To illustrate the feasibility of our technique, we applied it to a variety of breaking ball pitches captured under normal outdoor lighting conditions.
KW - Baseball
KW - High-speed video
KW - Spin analysis
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U2 - 10.1007/s11760-017-1075-x
DO - 10.1007/s11760-017-1075-x
M3 - Article
SP - 1
EP - 8
JO - Signal, Image and Video Processing
T2 - Signal, Image and Video Processing
JF - Signal, Image and Video Processing
SN - 1863-1703
ER -