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Tracking the ball is critical for video-based analysis of team sports.However, it is difficult, especially in low-resolution images, due to the smallsize of the ball, its speed that creates motion blur, and its often beingoccluded by players. In this paper, we propose a generic and principledapproach to modeling the interaction between the ball and the players whilealso imposing appropriate physical constraints on the ball's trajectory. Weshow that our approach, formulated in terms of a Mixed Integer Program, is morerobust and more accurate than several state-of-the-art approaches on real-lifevolleyball, basketball, and soccer sequences.

What Players do with the Ball: A Physically Constrained Interaction Modeling