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Improving performance with
diferent length templates
using both of correlation and
absolute difference on similar
play estimation
Kyota Aoki; Ryo Aita Graduate school of Engineering, Utsunomiya University, 7-1-2, Yoto, Utsunomiya, Tochigi, Japan
Plays in sports are described as the motions of players. This paper proposes the similar play retrieving
method based on the motion compensation vector in MPEG sports videos. This work uses the one-di-
mensional degenerated descriptions of each motion image between two adjacent frames. Connecting the
one-dimensional degenerated descriptions on time direction, we have the space-time image. This space-
time image describes a sequence of frames as a two-dimensional image. Using this space-time image,
this work shows the performance using both of the correlation and the absolute difference to retrieve a
small number of plays in a huge number of frames based on a single template play. There are diferences
between the templates for absolute difference and correlation. We discuss about the length of templates.
Our experiment records 0.899 as recall, 0.922 as precision and 0.910 as F-measure in 168 plays in 132485
frames with the best mix of two different length of templates.
Play estimation
Motion compensation vector
MPEG video
Absolute diference
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