Measurement in Sports: Umpire Information System

QuesTec, a leader in measurement technologies, has teamed with Major League Baseball to maintain the Umpire Information System (UIS). According to QuesTec, "The UIS uses QuesTec's proprietary measurement technology that analyzes video from cameras mounted in the rafters of each ballpark to precisely locate the ball throughout the pitch corridor. This information is then used to measure the speed, placement, and curvature of the pitch along its entire path. The UIS tracking system is a fully automated process that does not require changes to the ball, the field of play, or any other aspect of the game. Additional cameras are mounted at the field level to measure the strike zone for each individual batter, for each individual pitch, for each at bat. This information is compiled on a CD ROM disk and given to the home plate umpire immediately following each game."

How does it work?

"QuesTec technology actually measures information about interesting events during the game that would not be available any other way... The ball tracking component uses cameras mounted in the stands off the first and third base lines to follow the ball as it leaves the pitcher's hand until it crosses the plate. Along the way, multiple track points are measured to precisely locate the ball in space and time. This information is then used to measure the speed, placement, and curvature of the pitch along its entire path. The entire process is fully automatic including detection of the start of the pitch, tracking of the ball, location computations, and identification of non-baseball objects such as birds or wind swept debris moving through the field of view. No changes are made to the ball, the field of play, or any other aspect of the game, to work with QuesTec technology." QuesTec claims the technology is accurate to within 0.5 inch.

QuesTec Umpire Information System. Available at: www.questec.com

Measurement in Sports: Umpire Information System. QuesTec … Rasch Measurement Transactions, 2013, 27:2 p. 1421

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