Mr. Djamel Benarab Profile

Djamel Benarab

PhD Student at ISEN Brest

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Proceedings Article | 20 April 2016 Paper

All-automatic swimmer tracking system based on an optimized scaled composite JTC technique

D. Benarab, T. Napoléon, A. Alfalou, A. Verney, P. Hellard

Proceedings Volume 9845, 98450E (2016) https://doi.org/10.1117/12.2225448

KEYWORDS: Composites, Databases, Calibration, Video, Image filtering, Detection and tracking algorithms, Head, Motion detection, Target detection, Cameras, Optical tracking

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In this paper, an all-automatic optimized JTC based swimmer tracking system is proposed and evaluated on real video database outcome from national and international swimming competitions (French National Championship, Limoges 2015, FINA World Championships, Barcelona 2013 and Kazan 2015). First, we proposed to calibrate the swimming pool using the DLT algorithm (Direct Linear Transformation). DLT calculates the homography matrix given a sufficient set of correspondence points between pixels and metric coordinates: i.e. DLT takes into account the dimensions of the swimming pool and the type of the swim. Once the swimming pool is calibrated, we extract the lane. Then we apply a motion detection approach to detect globally the swimmer in this lane. Next, we apply our optimized Scaled Composite JTC which consists of creating an adapted input plane that contains the predicted region and the head reference image. This latter is generated using a composite filter of fin images chosen from the database. The dimension of this reference will be scaled according to the ratio between the head's dimension and the width of the swimming lane. Finally, applying the proposed approach improves the performances of our previous tracking method by adding a detection module in order to achieve an all-automatic swimmer tracking system.

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