Identifying players in broadcast sports videos using conditional random fields

We are interested in the problem of automatic tracking and identification of players in broadcast sport videos shot with a moving camera from a medium distance. While there are many good tracking systems, there are fewer methods that can identify the tracked players. Player identification is challenging in such videos due to blurry facial features (due to fast camera motion and low-resolution) and rarely visi-ble jersey numbers (which, when visible, are deformed due to player movements). We introduce a new system consist-ing of three components: a robust tracking system, a robust person identification system, and a conditional random field (CRF) model that can perform joint probabilistic inference about the player identities. The resulting system is able to achieve a player recognition accuracy up to 85 % on unla-beled NBA basketball clips. 1