Editing Hawk-Eye (section)

===Cricket===
{{main|Umpire Decision Review System}}

The technology was first used by [[Channel 4]] during a [[Test cricket|Test match]] between [[England cricket team|England]] and [[Pakistan national cricket team|Pakistan]] on [[Lord's Cricket Ground]], on 21 May 2001. It is used by the majority of television networks to track the trajectory of balls in flight. Its major use in cricket broadcasting is in analysing [[leg before wicket]] (LBW) decisions, where the likely path of the ball can be projected forward, through the [[batsman]]'s legs, to see if it would have hit the [[Stump (cricket)|stumps]].

In the winter season of 2008/2009 the [[International Cricket Council|ICC]] trialled a referral system where Hawk-Eye was used for referring decisions to the third umpire if a team disagreed with an LBW decision. Initially the third umpire was able to look at what the ball actually did up to the point when it hit the batsman, but could not look at the predicted flight of the ball after it hit the batsman.<ref>{{cite web|url=http://icc-cricket.yahoo.com/about-icc/rules-regulations.html |title=About ICC – Rules and Regulations |publisher=Icc-cricket.yahoo.com |date=1 January 2009 |access-date=1 June 2009 |url-status=dead |archive-url=https://web.archive.org/web/20081226210155/http://icc-cricket.yahoo.com/about-icc/rules-regulations.html |archive-date=26 December 2008 }}</ref>  The third umpire is now able to see the projected path of the ball too, and Hawk-Eye is currently sanctioned in international cricket even though some doubts remain about its accuracy.<ref>{{cite web|url=http://www.theroar.com.au/2008/01/24/nine-admits-hawk-eye-not-foolproof/ |title=Nine admits Hawk-Eye not foolproof » The Roar – Your Sports Opinion |publisher=The Roar |date=24 January 2008 |access-date=1 June 2009}}</ref>

When an LBW decision is referred to Hawk-Eye, it assists in assessing against three criteria:
* Where the ball pitched (in particular with respect to the stumps)
* The location of impact on the leg of the batsman (in particular with respect to the stumps)
* The projected path of the ball past the batsman

In all three cases, marginal calls result in the on-field umpire's call being maintained.

Due to its real-time coverage of bowling speed, the system is also used to show delivery patterns of a bowler's behaviour such as [[Bowling (cricket)#Line and length|line and length]], or [[Swing bowling|swing]]/turn information. At the end of an [[Over (cricket)|over]], all six deliveries are often shown simultaneously to illustrate a bowler's variations, such as slower deliveries, bouncers and leg-cutters. A complete record of a bowler can also be shown over the course of a match.

Batsmen also benefit from the analysis of Hawk-Eye, as a record can be brought up of the deliveries from which a batsman scored. These are often shown as a 2-D silhouetted figure of a batsman and colour-coded dots of the balls faced by the batsman. Information such as the exact spot where the ball pitches or speed of the ball from the bowler's hand (to gauge batsman reaction time) can also help in post-match analysis.