Summary
Computer vision technology that tracks the trajectory of the cricket ball and predicts its future path, used primarily for LBW decisions in DRS.
Full Explanation
Hawk-Eye is a computer vision system developed by Dr. Paul Hawkins that uses six or more cameras to track the ball's trajectory. It can predict where the ball would have gone after hitting the batsman's pad.
The system captures the ball from the moment it leaves the bowler's hand and uses complex algorithms to project its path. For LBW decisions, it shows three key elements: where the ball pitched, where it hit the pad, and where it was going.
Hawk-Eye was first used in cricket broadcasting in 2001 and became part of the official DRS in 2008. While the technology has improved significantly, it still has an acknowledged margin of error, which is why Umpire's Call exists.
In recent years, the ICC has explored using AI-enhanced ball tracking that could potentially eliminate the need for Umpire's Call.
Key Points
- •Uses 6+ high-speed cameras to track ball trajectory
- •Can predict ball path with approximately 2.5mm margin of error
- •Developed by Dr. Paul Hawkins in 2001
- •Shows pitch point, impact point, and predicted path
- •Forms the core of DRS for LBW decisions
Notable Controversies
- •Accuracy questioned in early years — some boards refused to accept it
- •Debate about whether it should override umpire's call entirely
- •Different broadcast companies use different tracking systems
Related Rules
LBW (Leg Before Wicket)
A batsman can be given out if the ball hits the pad and would have gone on to hit the stumps, subject to various conditions about where the ball pitched and where it hit the pad.
Decision Review System (DRS)
A technology-based system that allows players to challenge on-field umpiring decisions using ball-tracking, UltraEdge, and video replays.
Umpire's Call
When DRS shows the ball is only marginally hitting the stumps (less than 50%), the on-field umpire's original decision stands — cricket's most controversial modern rule.