关键词: 立体匹配, 外极线约束, 运动捕捉, 标记点

Abstract: In order to solve the overlapped marker matching issues and satisfy speed requirement in a 3D video motion capture system，a novel algorithm was proposed.We calculated the mean vertical coordination difference of these two parallel structure cameras to reduce 3D matching error，and the epipolar geometry restriction was used to make the corresponding matching marker points be restricted within a given area.To compare with traditional epipolar geometry restriction method that searched the matching point in a whole line，the algorithm restrict the searching region around one estimate point.Consequently，the matching speed was improved greatly owe to the reduced the searching area.To deal with the case of the points overlapped with each other，we used clustering algorithm and minimized the weighted distance to obtain the accurate matching points.Therefore，the matching accurateness has been improved.Several experimental results show this algorithm is effective.

Key words: stereo matching, epipolar line restriction, motion capture, marker points