Hawk-Eye Technology in Cricket: Ball-Tracking, DRS, and Pitch Maps Explained
Hawk-Eye is the ball-tracking system at the heart of cricket's Decision Review System — used to predict ball trajectories for LBW reviews, generate pitch maps, and enhance broadcast graphics.
What Is Hawk-Eye?
Hawk-Eye is a computer vision and ball-tracking system that uses multiple high-speed cameras positioned around the ground to triangulate the exact position of the cricket ball at every moment of its flight. The system was originally developed for tennis line-call reviews and was adapted for cricket in the early 2000s. In cricket, Hawk-Eye serves as the primary technology underpinning the Decision Review System (DRS).
LBW Reviews and Ball Trajectory Prediction
The most critical use of Hawk-Eye in cricket is for LBW (Leg Before Wicket) reviews. When a batter reviews an on-field LBW decision, Hawk-Eye tracks the ball from the bowler's hand to the point of impact and then predicts where the ball would have gone after hitting the pad. The prediction is probabilistic — the predicted trajectory is shown as a cone of probability, and 'Umpire's Call' applies when the predicted path clips but does not wholly hit the stumps.
Hawk-Eye LBW Review
A ball hits the batter's pad at middle stump height. Hawk-Eye tracks the impact point and predicts the ball would have hit the top of middle stump. Decision: Out (LBW). If the ball was predicted to clip the top bail but the full ball was not wholly hitting the stumps, Umpire's Call applies — the on-field decision stands.
Pitch Maps and Wagon Wheels
Beyond DRS, Hawk-Eye generates data for broadcast graphics that have become essential to modern cricket coverage. Pitch maps show where each delivery landed — revealing whether a bowler is targeting off stump, short of a length, or full. Wagon wheels show where a batsman has scored their runs by plotting shot direction. Wagon wheels and pitch maps are now standard features of television commentary.
Limitations and Controversy
Hawk-Eye has not been without controversy. Its LBW trajectory predictions involve probability estimates based on the ball's path up to the impact point — the further the ball would have needed to travel, the wider the cone of uncertainty. Critics argue that 'Umpire's Call' creates inconsistency. A delivery predicted to hit 51% of the stumps overturns the decision, while one hitting 49% does not.
Frequently asked questions
How does Hawk-Eye work in cricket?
Hawk-Eye uses multiple high-speed cameras to track the cricket ball's trajectory, predict where it would have gone after hitting a pad, and determine whether it would have hit the stumps — used in LBW reviews under DRS.
What is Umpire's Call in DRS?
Umpire's Call in DRS means the predicted Hawk-Eye trajectory clips but does not fully hit the stumps — in these cases, the on-field umpire's decision stands rather than being overturned.