-
While both CAIROS and GoalRef use magnetic fields around the goal and need to insert a chip in the ball, Hawk-Eye and GoalControl use a 3D imaging system to determine the precise location of the ball.
CNN: Latecomer wins FIFA goal-line tech deal
-
And Shivnarine Chanderpaul was controversially given out to a ball which Hawk-eye predicted would have missed the stumps off James Anderson for 70.
BBC: Swann defends umpiring referrals
-
The controversial Hawk-Eye ball-tracking system, which was developed in England and can accurately call LBWs (leg before wickets), catches and run-outs, is now used in other sports, including tennis.
CNN: Tech puts cricketers on right lines
-
At the top of that list is Hawk-Eye, the ball tracking system already used in tennis and cricket that may soon stake its place in World Cup soccer.
FORBES: The Sports Names You Need To Know In 2013
-
Overlooked by FIFA for those tournaments, Hawk-Eye -- which already provides ball-tracking systems for tennis and cricket -- will install its technology in 20 Premier League grounds and at Wembley, which will host August's Community Shield.
CNN: England on course for goal-line history
-
Hawk-Eye's system uses seven cameras to track the movement of the ball and sends a signal -- within a second -- to watches worn by match officials when a goal is scored.
CNN: England on course for goal-line history
-
The Hawk-Eye system uses strategically-placed cameras to determine the exact flight of a ball and is already used in international cricket and at grand slam tennis tournaments.
CNN: Goal-line technology enters final testing
-
The Hawk-Eye system is extensively used in tennis, using cameras to calculate the trajectory of the ball.
CNN: Does football need technology?