The DFL Deutsche Fußball Liga GmbH has decided that computer tracking company 'Hawk-Eye' will provide the technology for use in Germany's top flight. But how does the system work?
Hawk-Eye uses 14 high-speed cameras, including one for each goal fitted to the stadium's roof. If the ball comes within the vicinity of the goal, images from each camera capture its movement and software calculates its exact position from different angles, even if only a small part of the ball is visible.
As soon as the ball definitively crosses the goal-line, the system sends an acoustic signal to the match referee's earpiece within one second, while his watch also vibrates and displays the message 'GOAL'. A few seconds later an action replay, recorded by the special replay cameras fixed directly in line with the goal line, is displayed on television screens for spectators in the stadium.
World leader in football tracking technology
Hawk-Eye, a British company in existence since 2001, currently leads the world in the field of ball-tracking technology. Owned by Sony since 2011, its software is predominantly known for being used at tennis Grand Slams but it has also been implemented in cricket and at the Olympic Games.
The English Premier League introduced the Hawk-Eye system at the start of the 2013/14 campaign to settle contentious decisions and it is now being used increasingly in professional football. Hawk-Eye is recognised the world over across a range of sports and has been used in different 230 stadia.