三维摄影解析中人体关节角度的计算方法

Calculating Method of Human Joint Angle in Three-Dimensional Film Analysis

人体运动的基础是环节围绕关节轴的转动,因此对人体关节角的概念和计算方法进行定义与规范是准确描述人体运动的保证,也是不同研究者间进行资料对比、数据共享的基础。本研究参考国外有关文献资料,利用影片解析所得到的人体测量点坐标对人体基本轴和基本切面进行了定义;根据人体运动解剖学对关节角度的定义,应用空间解析几何的知识,确定了人体上肢、下肢主要关节角度和躯干姿位的计算方法;应用VB开发了计算关节角度的软件;应用软件对棒球投掷时运动员的肩关节角度进行计算,计算的结果符合动作技术实际。

In the process of studying the motion techniques of athletes using the method of sports biomechanics, it is certainly important to define and standardize the concept and research method of joint angle in human body. This not only guarantees the accuracy of the description of body movement, but also builds the foundation for the comparison and sharing of materials and information for different researchers. With references to a variety of documentary materials in the international community, this article tries to serve the purpose of finding out the basic method for motion technique study. First of all, by using film analysis, which could eventually produces the coordinates of body measurements, it redefines the basic stalk and slice of human body. Secondly, it defines the joint angle with the knowledge of human body anatomy. Besides, based on the space analytic geometry, it also establishes the basic method to calculate the joint angle of arms and legs and at the same time the method for calculating the position of human body. Finally, it introduces the development of software based on VB for calculation of joint angle. Naturally, this newly-developed software was put into practice when calculating the joint angle of a baseball player who is in the movement of throwing a ball, and of course, the results are accord with the actual motion techniques as expected.