Video analysis software and its application to trampolining
R White & L Kouache (2007)
University of Sunderland, UK
Journal of Sports Sciences, 25 (3), 235-369.
Abstracts : BASES Annual Conference, 11th-13th September 2006 : University of Wolverhampton.
Digital video recording has revolutionized processing and analysis of video information in almost every sport. There is a plethora of video analysis software available and each has its own unique features.
The aim of this study was to investigate the benefits of video analysis software when applied to coaching and judging in trampolining. Video clips of beginners up to international performers were captured and assessed for their usefulness in coaching (technique analysis) and judging (performance assessment). Three software packages (Dartfish, Quintic, and Silicon Coach) were compared for their suitability as a coaching tool and an aid to judging as they had been developed with biomechanical features. For the purpose of coaching, certain specific features were assessed: live capture, instant replay, split screen, digitizing facilities, playback speeds, tagging, drawing tools, special features (i.e. SimulCam, StroMotion), and import and export of data from multiple formats for editing, publishing, and presentations. A kinematic investigation was undertaken for judging and the following features assessed: live capture, split screen, instant replay, pause facility, tagging, and quick location were compared for use with all standards of performance.
The software packages were a useful addition to visualization of coaching trampolining as the movement could be replayed at much slower speeds than the live performance, almost instantly after capture, repeatedly played, and a more precise analysis obtained. The ease and speed of use is vital when judging competitions due to time constraints. Some limited use of video is already used in judging for the calculations of the difficulty (tariff) of the skills. The trampolining performance at competition lasts approximately 30 s and involves 10 skills. This fast moving action requires simultaneous assessment at multiple joints in three dimensions. Inputs from several cameras were needed to assess performance in more than one plane of motion. This can be achieved with both Dartfish and Quintic.
All three versions of the software were used for measuring consistency of jump height. Useful comparisons of technique were made using the SimulCam and StroMotion features in Dartfish.
The digitization facility was compared for all three software packages, for example in assessing the range of plantar flexion and dorsiflexion of the foot. The visual display of Quintic had many useful biomechanical features relevant to trampolining. Navigation through the Quintic analysis software was straightforward and intuitive. Silicon Coach was very user friendly and easy to learn but did not offer the full range of features available from Quintic or Dartfish.