A new method of estimating swimmer position in swimming pool video is proposed. The video of swimming games istaken from a higher seat row in audience seat area. It can cover the whole field of a swimming pool. The swimming poolvideo is transformed so that each lane can be analyzed along with the lane direction. The foreground region that includesboth the swimmer and their water splash is extracted by adaptive background modeling and by setting the mask region tocope with the influence of the non-planer water surface. Then, based on the color analysis on water splash, swimmerregion can be successfully extracted. The position is estimated as the center of the Gaussian distribution of the swimmerregion. The proposed method was applied to a nationwide swimming game.
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