Recently, there has been an increase in the use of video and statistical data in sports practice and coaching. A playertrackingfunction plays an important role in order to obtain players’ trajectories which are essential for performingstatistical analyses of players. Usually, in video-based tracking systems, sensor cameras are mounted to ceiling toprevent players from overlapping on the image, because the overlapping makes it difficult to detect overlapped furtherplayers, which may lead wrong trajectories. So, the ceiling cameras are useful for tracking but it is expensive to mounton ceiling, thus a system using wall-mounted cameras that can be installed at low cost is desired. However, wallmountedcameras cause a problem that players may overlap each other on the image. To overcome this problem which isinevitable for such wall-mounted camera systems, we propose a stable tracking method which determines the position ofthe player having less overlapping ratio earlier and determines ones having more overlapping ratio later with usingpreviously determined players’ positions. The overlapping ratio is defined by using the positional relation between thetarget player and one’s surrounding players from all of those images where the target player exists. Experimental resultswith real basketball scenes show that the positional error is less than 15cm, and the processing time is less than10ms/frame at 3.0 GHz CPU, which proved that our method has enough performance for using real-time player trackingsystem.
展开▼
