Hot Spot is an infra-red imaging system used in cricket to determine whether the ball has struck the batsman'sbat. Hot Spot uses two infra-red cameras on opposite sides of the ground above the field of play that are continuously recording the game. Any suspected snick or bat/pad event can be verified by examining the infra-red hot spot image, which shows a bright spot where contact friction from the ball has elevated the local temperature.
After referring the decision it is clear to see that the umpire was wrong and the batsman is OUT! You can see the bright white dot on the bat where the ball has struck from the use of the infra-red cameras.
Watch Hot Spot in action:
http://www.youtube.com/watch?v=_CTfREipYxc (0:54 Richie Benaud mentions how it is a fantastic innovation!)
Hot spot has been supported by nearly all cricketers bar that of the Indian cricket team. India's captain MS Dhoni said after the Melbourne Test that he had been a fan of Hot Spot before India's tour of England last year, but he was no longer convinced he could trust the technology. There was a number of appeals during the England-India series that went to umpire reviews and Hot Spot showed inconclusive results.
Further developments are being made to Hot Spot New. Inventor Warren Brennan, believes his technology can now pick up even the faintest of edges after the development of more sensitive cameras. Read more below.