Hakkarainen Marko J, Bragge Timo, Liikavainio Tuomas, Arokoski Jari, Karjalainen Pasi A, Tarvainen Mika
Department of Physics and Mathematics, University of Eastern Finland, Kuopio, Finland.
J Biomech Eng. 2010 Nov;132(11):114501. doi: 10.1115/1.4002368.
This paper proposes a method for comparing data from accelerometers, optical based 3D motion capture systems, and force platforms (FPs) in the context of spatial and temporal differences. Testing method is based on the motion laboratory accreditation test (MLAT), which can be used to test FP and camera based motion capture components of a motion analysis laboratory. This study extends MLAT to include accelerometer data. Accelerometers were attached to a device similar to the MLAT rod. The elevation of the rod from the plane of the floor is computed and compared with the force platform vector orientation and the rod orientation obtained by optical motion capture system. Orientation of the test device is achieved by forming nonlinear equation group, which describes the components of the measured accelerations. Solution for this equation group is estimated by using the Gauss-Newton method. This expanded MLAT procedure can be used in the laboratory setting were either FP, camera based motion capture, or any other motion capture system is used along with accelerometer measurements.
本文提出了一种在空间和时间差异背景下比较来自加速度计、基于光学的3D运动捕捉系统和力平台（FP）数据的方法。测试方法基于运动实验室认证测试（MLAT），该测试可用于测试运动分析实验室中基于FP和相机的运动捕捉组件。本研究将MLAT扩展到包括加速度计数据。加速度计被连接到一个类似于MLAT杆的装置上。计算杆相对于地面平面的高度，并与力平台矢量方向以及通过光学运动捕捉系统获得的杆的方向进行比较。通过形成描述测量加速度分量的非线性方程组来实现测试装置的定向。使用高斯-牛顿法估计该方程组的解。这种扩展的MLAT程序可用于实验室环境，其中FP、基于相机的运动捕捉或任何其他运动捕捉系统与加速度计测量一起使用。
