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The Umpire Decision Review System (abbreviated as UDRS or DRS) is a technology-based system used in the sport of cricket. The system was first introduced in Test cricket, for the sole purpose of reviewing controversial decisions made by the on-field umpires as to whether or not a batsman had been dismissed. The system was first tested in an India v Sri Lanka match in 2008.〔(New review system on the cards )〕 The system was officially launched by the International Cricket Council ("ICC") on 24 November 2009 during the first Test match between New Zealand and Pakistan at the University Oval in Dunedin. It was first used in One Day Internationals in January 2011, during England's tour of Australia. The ICC initially made the UDRS mandatory in all international matches,〔(【引用サイトリンク】url=http://www.espncricinfo.com/ci-icc/content/current/story/520913.html )〕 but later made its use optional, so that the system would only be used if both teams agree. The ICC has agreed to continue to work on the technology and will try to incorporate its use into all ICC events. On 29 October 2012, the International Cricket Council made amendments on LBW protocols, increasing the margin of uncertainty when the ball hits the batsman's pad. On 18 September 2013, the International Cricket Council announced that for a trial period starting in October 2013, a team's referrals would be reset to two after 80 overs in an innings in Test matches. Previously each team had a maximum of two unsuccessful reviews in an innings. ==Components== There are three components in UDRS. The use of Snickometer was suspended but was reintroduced in 2013.〔(Real Time Snicko )〕〔(Hawk-Eye needs a leap of faith - Srinivasan )〕 * Hawk-Eye, Eagle Eye, or Virtual Eye: ball-tracking technology that plots the trajectory of a bowling delivery that has been interrupted by the batsman, often by the pad, and can determine whether it would have hit the wicket or not. * Hot Spot: Infra-red imaging system that illuminates where the ball has been in contact with bat or pad. * Real time Snickometer, which relies on directional microphones to detect small sounds made as the ball hits the bat or pad. Hot spot's success rate is found to be 90–95%. New cameras were used in Border-Gavaskar series in 2011–12 for viewers, which were vastly superior to those that had been part of the DRS in the past.〔(UDRS new cameras )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Umpire Decision Review System」の詳細全文を読む スポンサード リンク
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