Quantitative Measurement of Teamwork in Ball Games Using Dominant Region

This paper proposes a basic feature for quantitative measurement and evaluation of group motion in team sports. This feature called dominant region is a sphere of influence of each player or each team (the space where the player or the team is superior to others). Basic teamwork in ball games such as cooperative movement, space making and ball passing by players can be evaluated quantitatively by using dominant regions and their time variation. In the paper, the dominant region is applied to two different ball games; soccer games and handball games, in order to verify its applicability. How to use the dominant region in calculation of some basic teamwork is presented. From the experiments using actual games scenes, it is shown that the dominant region can be commonly used to quantitatively evaluate inferiority or superiority of teamwork in both soccer and handball games.