Rastreamento automatico de trajetorias de jogadores de futebol por videogrametria : validação do metodo e analise dos resultados

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

An objective analysis of the dynamic of a soccer game required the development of efficient methodologies for detection and codification about information during the match. The continuous data about the position in function of time of each players movement, make possible the analysis of covered distances, the displacement region in the field, the distribution of velocities, as well as the tactical analysis of the players movement. An automatic method capable in providing this data was recently proposed and it is based on the video register of a game by digital cameras and the tracking of the players using image processing and computer vision techniques. The advantages of this method consist in making available of simultaneous data of the players of both teams, without interfering in the performance or causing risk to the players, since they don?t need to carry any device as it is used by other methods found in the literature. This work consists in validation of method for automatic tracking of players based on videogrammetry. The method was applied in a official match of the national soccer championship. The objective of this study was a) evaluate the accuracy of the method in the determination of the position of the points in the field; b) evaluate the accuracy of the method in the determination of the distance covered by the players; c) evaluate the applicability of the method in a official soccer game. The result of the evaluation of the measured player position was: accuracy (30,61cm), bias (30,53cm), precision (2,16cm). The result of evaluation of the total distance covered by a subject in the experimental test was: observed value (2.884,67 m). The difference found between the expected value (2.924 m) and the observed value was 40,19 m and this result represents a relative error of 1,37%. The analysis of linear regression showed that the method based on videogrammetry supplied a measurement equivalent to the values obtained by direct measurement: R2 (1,00), angular coefficient (0,9877) with confidence interval (0,9868 m to 0,9887 m), linear coefficient (-2,2680 m) with confidence interval (-4,0151 m to ?0,5209 m). The method was applied in a official soccer match, and although the tracking was not totally automatic, it was possible to analyze the distance covered by all players and their velocities of both team during the first and the second half of the match. The method showed to be confident for the identification of the studied variables, besides not interfering in the performance of the player and can be used during the official matches

ASSUNTO(S)

futebol rastreamento automatico soccer tracking biomechanics biomecanica

ACESSO AO ARTIGO

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