基于Kwon3D动作分析系统对游泳动作的三维测量方法研究  

Method of 3D Measurement Applied to Swimming Based on Kwon3D Motion Analysis System

作　　者：陈亮[1] 严红[2] 门薇薇[3] 王嵘[2] 

机构地区：[1]天津体育学院运动生理与运动医学重点实验室,天津300381 [2]天津体育学院体育教育训练一系,天津300381 [3]天津体育学院体育文化传媒系,天津300381

出　　处：《天津体育学院学报》2016年第1期73-76,共4页Journal of Tianjin University of Sport

基　　金：国家体育总局科教司重点研究领域攻关课题(项目编号:2012B058)

摘　　要：运动生物力学的研究通常要借助专门的影像解析系统(软件)来获得三维运动学数据,游泳项目的水中三维影像解析一直是比较复杂和有难度的测试。国外对游泳的三维影像解析,大多也是以水下摄像机为主进行的三维测量。我国现阶段对游泳项目的研究大多尚处在二维摄像解析技术状态,而且我国使用水下三维摄像方法进行的为数不多的研究,其测试方法也只是完全在水下进行摄像测量。由于光线在不同介质中传播,会发生折射和反射。因此,对水中动作进行测试时,如果仅使用陆上摄像机或仅使用水下摄像机进行测试,光线折射带来的误差就会较大,更加影响了测试数据的准确性。以蛙泳动作为例,介绍一种基于Kwon3D动作分析系统的三维测量方法,此方法不同于单纯的水下摄像测试,是一种陆上摄像机与水下摄像机结合的三维测试方法。试验中,使用2台水下摄像机、2台陆上摄像机,对水上和水下空间用同一个定标框架同时定标。经过对三维重构精度进行分析和验证,结果表明,综合重建误差较小,平均相对误差小于1%。Study of sports biomechanics are often with the help of a special image analysis system（software）to obtain three dimensional kinematic data. Theunderwater three-dimensional motion image analysis of swimming is always complex and difficult. Foreign swimming 3D image analysis is mainly underwatercameras for 3D measurement. Most studies of the swimming events at the present stage in China is given priority to with two dimensional image analysis. ButChina＇s underwater 3D imaging methods are one of the few studies,its measurement method is completely underwater camera measurement. As measured inthe water,therefore,if only use camera on land,or just use underwater cameras,light refraction error will be larger,more affected the accuracy of the mea-surement data. As breaststroke action as an example,this paper introduces a method of 3D measurement and digitization based on Kwon3 D Motion AnalysisSystem. This method is different from pure underwater three-dimensional camera measurement,and it is a three-dimensional test method which combinesland camera with underwater camera. In the experiment two underwater cameras and two cameras of the land were used to record images,the calibration ofthe space underwater and out of the water were performed by the same calibration frame at the same time. Through analysis of three-dimensional reconstruc-tion precision and verification, the results showed that the comprehensive reconstruction error is small,the average relative error is less than 1%.

关 键 词：运动生物力学 三维测量 三维重构 游泳 Kwon3D 动作分析 

分 类 号：G804.6[文化科学—运动人体科学]