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Automatic spin measurements for pitched Baseballs
via consumer-grade high-speed cameras
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.
This page provides authors' archives. Visit Springer page
for the final publication.
Takashi Ijiri, Atsushi Nakamura, Akira Hirabayashi, Wataru Sakai, Takeshi Miyazaki, Ryutaro Himeno,
Automatic spin measurements for pitched Baseballs via consumer-grade high-speed cameras,
SIViP (2017). doi:10.1007/s11760-017-1075-x.
author ="Ijiri, Takashi and Nakamura, Atsushi and Hirabayashi, Akira
and Sakai, Wataru and Miyazaki, Takeshi and Himeno, Ryutaro",
title ="Automatic spin measurements for pitched Baseballs via consumer-grade high-speed cameras",
journal ="Signal, Image and Video Processing",
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