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Football-specific validity of TRACAB's optical video tracking systems

Linke, Daniel ; Link, Daniel ; Lames, Martin Kerhervé, Hugo A.

PloS one, 2020-03, Vol.15 (3), p.e0230179-e0230179 [Periódico revisado por pares]

United States: Public Library of Science

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  • Título:
    Football-specific validity of TRACAB's optical video tracking systems
  • Autor: Linke, Daniel ; Link, Daniel ; Lames, Martin
  • Kerhervé, Hugo A.
  • Assuntos: Acceleration ; Accuracy ; Architecture ; Biology and Life Sciences ; Cameras ; Computer and Information Sciences ; Computer programs ; Deceleration ; Engineering and Technology ; Football ; Global positioning systems ; GPS ; Image processing ; Image processing software ; Informatics ; Low speed ; Media coverage ; Medicine and Health Sciences ; Motion capture ; Motion perception ; Optical tracking ; Physical Sciences ; Players ; Position indicators ; Position measurement ; Professional soccer ; Reference systems ; Research and Analysis Methods ; Retirement benefits ; Running ; Satellites ; Setting (Literature) ; Soccer ; Social Sciences ; Statistical analysis ; Studies ; Technology ; Testing ; Tracking systems ; United Kingdom ; Validity ; Velocity ; Video equipment ; Video processing equipment
  • É parte de: PloS one, 2020-03, Vol.15 (3), p.e0230179-e0230179
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
    Competing Interests: This research was supported by a research fund that was received from ChyronHego and Deutsche Fußball Liga DFL. The Technical University of Munich, represented by the Chair of Training Science and Sports Informatics, functioned as an independent third party for conducting this validation study. The funders did not exhibit influence on study design, data collection and analysis, decision to publish, or preparation of the manuscript. These conditions do not alter our adherence to PLOS ONE policies on sharing data and materials. We declare that with ChyronHego and Deutsche Fußball Liga DFL, no relationship like employment, consultancy, patents, products in development, marketed products, etc. exists. Further, the authors do not own sticks or shares of STATS LLC and the authors are not paid for employment of consultancy. This does not alter our adherence to PLOS ONE policies on sharing data and materials.
  • Descrição: The present study aimed to validate and compare the football-specific measurement accuracy of two optical tracking systems engineered by TRACAB. The "Gen4" system consists of two multi-camera units (a stereo pair) in two locations either side of the halfway line, whereas the distributed "Gen5" system combines two stereo pairs on each side of the field as well as two monocular systems behind the goal areas. Data were collected from 20 male football players in two different exercises (a football sport-specific running course and small-sided games) in a professional football stadium. For evaluating the accuracy of the systems, measures were compared against simultaneously recorded measures of a reference system (VICON motion capture system). Statistical analysis uses RMSE for kinematic variables (position, speed and acceleration) and the difference in percentages for performance indicators (e.g. distance covered, peak speed) per run compared to the reference system. Frames in which players were obviously not tracked were excluded. Gen5 had marginally better accuracy (0.08 m RMSE) for position measurements than Gen4 (0.09 m RMSE) compared to the reference. Accuracy difference in instantaneous speed (Gen4: 0.09 m⋅s-1 RMSE; Gen5: 0.08 m⋅s-1 RMSE) and acceleration (Gen4: 0.26 m⋅s-2 RMSE; Gen5: 0.21 m⋅s-2 RMSE) measurements were significant, but also trivial in terms of the effect size. For total distance travelled, both Gen4 (0.42 ± 0.60%) and Gen5 (0.27 ± 0.35%) showed only trivial deviations compared to the reference. Gen4 showed moderate differences in the low-speed distance travelled category (-19.41 ± 13.24%) and small differences in the high-speed distance travelled category (8.94 ± 9.49%). Differences in peak speed, acceleration and deceleration were trivial (<0.5%) for both Gen4 and Gen5. These findings suggest that Gen5's distributed camera architecture has minor benefits over Gen4's single-view camera architecture in terms of accuracy. We assume that the main benefit of the Gen5 towards Gen4 lies in increased robustness of the tracking when it comes to optical overlapping of players. Since differences towards the reference system were very low, both TRACAB's tracking systems can be considered as valid technologies for football-specific performance analyses in the settings tested as long as players are tracked correctly.
  • Editor: United States: Public Library of Science
  • Idioma: Inglês
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