PITCHf/x

PITCHf/x, created and maintained by Sportvision, is a system that tracks the speeds and trajectories of pitched baseballs. This system, which made its debut in the 2006 MLB playoffs, is installed in every MLB stadium.

Usage

PITCHf/x is a system using two 60 Hz cameras mounted in the stadium to track the speed and location of a pitched baseball from the pitcher's mound to home plate with an accuracy of better than one mile per hour and one inch. With PITCHf/x, statistics such as the pitcher with the fastest fastball, or the pitcher with the sharpest-breaking curve, etc., can be analyzed. It calculates the "movement" of pitches caused by the Magnus force.

The PITCHf/x data is used in MLB's online Gameday webcast to show the path and speed of each pitch, as well as the location with respect to the strike zone as the pitch crossed the front of home plate. Gameday presents two values from PITCHf/x to characterize the deflection of the pitch trajectory. The BRK quantity represents the amount of bend in the trajectory at its greatest distance from a straight line. A curveball will have a larger value of BRK than a fastball. The PFX quantity represents the deflection of the baseball due to the spin and drag forces from the path it would have taken under the influence of gravity alone. For example, a fastball would have a small value for BRK but a large value for the spin displacement PFX because of the rising action of the fastball caused by backspin. Conversely, a curveball or slider will have a significant break measurement, but lower spin displacement.