RELIABILITY OF A NEW METHOD TO ANALYSE AND TO QUANTIFY ATHLETES’ DISPLACEMENT

  • João Serrano
  • Orlando Fernandes
Keywords: TACTO, Reliability, Semi auto-tracking Digitalization, Soccer

Abstract

This investigation was to assess the accuracy of the local position measurement (LPM) by a semi-auto tracking software (TACTO) using a single video camera. The reconstruction of virtual coordinates into real coordinates was made using DLT-2D (Planar direct linear transformation), with algorithms adapted from the ISB in ‚MATLAB’ software. Seventy-eight digitalization’s were made by six subjects. Correlation coefficient of Pearson (r), intra-class correlation coefficient (ICC) and the relative technical error of the measurement (ETM) were used to analyze the relationship between coordinates obtained. The ICC was 0.974 for x component and 0.984 for y component. The ETM was 1-1.7% for x coordinate and 0.5-1.0% for y coordinate. The results, demonstrate the intraoperator and inter-operators reliability of the LPM by TACTO.