Hawk eye Technology

Hawk eye was first used by Channel 4 during a Test match between England and Pakistan on Lord's Cricket Ground, on 21 May 2001. It is used primarily by the majority of television networks to track the trajectory of balls in flight. In the winter season of 2008/2009 the 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. 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.Its major use in cricket broadcasting is in analysing leg before wicket 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 stumps. Consultation of the third umpire, for conventional slow motion or Hawk-Eye, on leg before wicket decisions, is currently sanctioned in international cricket even though doubts remain about its accuracy in cricket.Due to its realtime coverage of bowling speed, the systems are also used to show delivery patterns of bowler's behaviour such as line and length, or swing/turn information. At the end of an over, all six deliveries are often shown simultaneously to show 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.

Hawk Eye Controveries
The Australian media in cricket were critical of a specific LBW appeal made by Anil Kumble when Andrew Symonds was batting. The ball, as suggested by Hawk-Eye, would have bounced over the stumps, but to the naked eye looked absolutely out.

Hawk-Eye Innovations has defended the accuracy of its tracking technology used during the Cricket World Cup's most controversial umpiring moment, when an lbw decision against Sachin Tendulkar was reversed during India's semi-final against Pakistan.Ian Gould gave Tendulkar out lbw to Saeed Ajmal and shook his head with mystification when the decision was overturned on referral – a moment that may have cost England's leading official his chance to umpire in the World Cup final.Ajmal claimed he had bowled an arm ball that Hawk-Eye had somehow misread and there was even speculation that the wrong delivery had somehow been super-imposed, perhaps as part of a deliberate plot.