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In previous work, we developed a novel data association algorithm with graph-theoretic formulation, and used it to track a tennis ball in broadcast tennis video. However, the track initiation/termination was not automatic, and it could not deal with situations in which more than one ball appeared in the scene. In this paper, we extend our previous work to track multiple tennis balls fully automatically. The algorithm presented in this paper requires the set of all-pairs shortest paths in a directed and edge-weighted graph. We also propose an efficient All-Pairs Shortest Path algorithm by exploiting a special topological property of the graph. Comparative experiments show that the proposed data association algorithm performs well both in terms of efficiency and tracking accuracy.

All Pairs Shortest Path Formulation for Multiple Object Tracking with Application to Tennis Video Analysis