Cricket Rules

Hawk-Eye Ball Tracking Technology in Cricket Explained Fully

Karthik Iyer 24 April 2026 Updated 24 April 2026 ~5 min read ~917 words

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Every time a batter reviews an LBW decision and you see that 3D graphic of the ball pitching, striking the pad, and carrying on to the stumps, you're watching Hawk-Eye do its job. It's one of the most widely trusted pieces of sports technology in the world. But how does it actually work? How does software predict where a ball would have gone if it hadn't hit a pad? This explainer covers the whole system — cameras, math, calibration and real-world accuracy.

What Hawk-Eye is, in plain language

Hawk-Eye is a computer vision system. It uses multiple high-speed cameras positioned around the ground, tracks the ball's movement through the air and off the pitch, and builds a precise 3D model of the ball's trajectory. For LBW decisions, it takes the actual path the ball travelled up to impact, then uses physics-based modelling to predict where the ball would have gone if the batter's pad hadn't been in the way.

It was originally developed for television analysis and has since become a core part of DRS in cricket, line-calling in tennis, and analysis in several other sports.

The camera system

In a modern cricket telecast using Hawk-Eye, there are typically six or more high-speed cameras positioned around the ground. They are:

High-frame-rate. Each camera captures at several hundred frames per second.
Precisely calibrated. Their positions are known to the millimetre.
Synchronised. All cameras capture the same moment.
Tracking the ball's centre. Software identifies the ball in each frame and records its exact pixel location.

Because multiple cameras see the ball from different angles at the exact same instant, the software can use a technique called triangulation to calculate a precise 3D position of the ball.

How triangulation works

Think of two security cameras watching the same room from different corners. If a person is at a certain pixel in one camera's view and at a different pixel in the other's, the software can use the known positions of the cameras to calculate exactly where in 3D space the person is standing.

Hawk-Eye does this hundreds of times per second with a cricket ball. That produces a stream of 3D positions — effectively, a path in space.

Building the ball's path

Once Hawk-Eye has dozens of 3D positions for a single delivery, it fits a physics model to those positions. Cricket balls follow predictable trajectories in the air:

Gravity pulls the ball down.
Air drag slows the ball horizontally.
Spin and seam movement change the trajectory slightly.

The software fits a smooth curve through the measured positions and produces the full 3D flight path from release to impact.

Pitch impact and predicted path

When the ball hits the pitch, Hawk-Eye measures the impact location and the angle of the bounce. From there, it continues to track the ball as it travels towards the batter. At the point of impact with the pad (or bat), Hawk-Eye has the complete pre-impact path.

For LBW, the system then projects forward — using the ball's velocity, spin, and post-bounce behaviour — to predict where the ball would have gone if the pad had not been there. That projected path is what shows up on the TV graphic.

Margin of error

Hawk-Eye isn't magic. It has a stated margin of error, usually cited at a few millimetres for the measured path and a slightly higher uncertainty for the predicted section. This margin of error is exactly why cricket has the concept of "umpire's call" for LBW reviews.

If ball-tracking shows the ball only clipping the stump, the predicted path may be off by a few millimetres. To avoid giving a batter out on a margin smaller than the system's uncertainty, cricket defaults to the on-field umpire's original decision in those marginal zones.

Why Hawk-Eye is trusted

Transparent methodology. The physics is well-understood.
Independent testing. The system is calibrated at every venue.
Consistent results. The same input produces the same output, every time.
Cross-checked with other tech. UltraEdge, Hot Spot, and slow-motion corroborate key moments.

No single piece of technology is perfect. But Hawk-Eye, properly calibrated, is consistent and auditable in a way that human judgement can't always be.

What Hawk-Eye can and can't do

It can tell you:

Exactly where a ball pitched.
Exactly where it struck the pad.
A predicted path beyond the impact, within a stated margin.

It cannot tell you:

Whether the bat made contact with the ball (that's UltraEdge / Snicko / Hot Spot).
Whether the fielder had the bails in hand before the stumps broke (that's frame-by-frame replay).
The subjective side of a decision — only the physical one.