Hawk-Eye in sports

For a long time, many sports such as tennis and soccer always exists disputes of the drop points of the ball. These situations always happen since our naked eyes are not able to capture things precisely in a very short time. Nevertheless, the appearance of the Hawk-Eye technique almost eliminates those argues.

The Hawk-Eye technique is first developed in UK.The system works via six (sometimes seven) high-performance cameras, normally positioned on the underside of the stadium roof, which track the ball from different angles. The video from the six cameras is then triangulated and combined to create a three-dimensional representation of the trajectory of the ball. Hawk-Eye is not infallible and is accurate to within 5 millimetres (0.19 inch) but is generally trusted as an impartial second opinion in sports.

The operation of Hawk-Eye is quite ingenious. Those cameras in the fields will collect the 3D positions of the ball in each point of view. Then the system will calculate each frames and compile those data. It then calculates for each frame the 3D position of the ball by comparing its position on at least two of the physically separate cameras at the same instant in time. A succession of frames builds up a record of the path along which the ball has traveled.

The Hawk-Eye is largely used in tennis, soccer, volleyball, cricket,etc. The using of Hawk-Eye shows that the sports has been stepped into a higher level.




References:
1. Derived from: https://en.wikipedia.org/wiki/Hawk-Eye 

Image References:
1. Derived from: http://image.baidu.com/search/detail?ct=503316480&z=0&ipn=d&word