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trying to put a quantitative spin on video analysis.’ Cadavid gave a figure during his


presentation that, every year, Major League Baseball (MLB) spends more than $1.5 billion on its pitchers. Tat’s five times the combined salaries of all the starting quarterbacks in the National Football League, he added for comparison. Kinatrax’s system


consists of multiple cameras mounted throughout the stadium pointing at the pitcher’s mound. Tese capture high-speed synchronous video of the pitcher, from which the system obtains a 3D reconstruction of the pitch arm frame-by-frame and extracts the kinematic data. Te system is able to do micro-level


six million frames for pose estimation. A common injury for baseball pitchers is


The pinnacle of motion capture analysis would be to collect biomechanical data within the game


tearing their ulnar collateral ligament, which connects the upper arm to the lower arm. Traditionally, pitchers recovering from injury are analysed in a laboratory with marker- based motion capture to obtain data on the biomechanics of the throw. Even though marker-based motion capture is the gold standard for sports analysis, Cadavid said that there are advantages to a markerless system, the main one being analysis can be carried out during a game. ‘Te pinnacle of motion


capture analysis would be to be able to collect biomechanical data within


the game,’ he added. ‘In 2013 Kinatrax set out to do this.’ Te company provides the motion capture


analysis of the biomechanics of the pitcher. ‘We’re tracking more than 20 joints in the body on a frame-by-frame basis at over 300fps,’ Cadavid explained. Over the course of the 2016 season, Kinatrax analysed more than


results 12 to 24 hours aſter the game in order to achieve the level of accuracy required by the teams. Cadavid said that 95 per cent of the system’s frames are within a five degree angular error. Tis has been tested across


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elbow flexion and shoulder internal and external rotation, which are important measures for understanding the mechanics of the pitch. Te system can also compare pre-injury


mechanics with post-injury data to give an idea of when a pitcher can come back into the lineup. Kinatrax selects a series of key poses in the pitch delivery, including the windup, maximum external shoulder rotation, ball release, maximum internal shoulder rotation, and follow through, and subject-specific models are built for these actions. In 2016, the company built models for 300 pitchers spanning the majority of MLB. ‘We’re expanding that out to minor league,


where it’s even more important, because the mechanics there need more refinement, and there’s potentially more value added at the lower levels,’ Cadavid said. Te firm is also looking to expand to track the hitter, which is equally as interesting for many teams. ‘We did not help the Chicago Cubs win the


World Series, but we did provide data that provided them with some insights that were valuable to them,’ Cadavid concluded. ‘Tat was a nice success story last year.’ O


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