Accuracy and repeatability of joint angles measured using a single camera markerless motion capture system
Accuracy and repeatability of joint angles measured using a single camera markerless motion capture system
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DOI：
10.1016/j.jbiomech.2013.11.031
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发表时间：
2014-01-22
影响因子：
2.4
通讯作者：
Noehren, Brian
中科院分区：
文献类型：
--
作者：
Schmitz, Anne;Ye, Mao;Noehren, Brian
无标记运动捕捉系统已经发展为努力评估自然环境中的人类运动。然而，这些系统的准确性和可靠性仍有待研究。因此，本研究的目标是量化的准确性和重复性的关节角度使用一个单一的相机无标记的运动捕捉系统，并比较无标记的系统性能与基于标记的系统。将夹具放置在多个静态姿势中，使用十个相机运动分析系统收集标记轨迹。从单个Microsoft Kinect相机同时收集深度和彩色图像数据，随后用于计算虚拟标记轨迹。数字倾斜仪提供了矢状面和额状面关节角度的地面实况测量。关节角度的计算与标记数据从两个运动捕捉系统使用连续的身体固定旋转。从基于标记和无标记系统计算的矢状面和额状面关节角与测斜仪测量值一致< 0.5度。这些系统彼此一致，
Markerless motion capture systems have developed in an effort to evaluate human movement in a natural setting. However, the accuracy and reliability of these systems remain understudied. Therefore, the goals of this study were to quantify the accuracy and repeatability of joint angles using a single camera markerless motion capture system and to compare the markerless system performance with that of a marker-based system. A jig was placed in multiple static postures with marker trajectories collected using a ten camera motion analysis system. Depth and color image data were simultaneously collected from a single Microsoft Kinect camera, which was subsequently used to calculate virtual marker trajectories. A digital inclinometer provided a measure of ground-truth for sagittal and frontal plane joint angles. Joint angles were calculated with marker data from both motion capture systems using successive body-fixed rotations. The sagittal and frontal plane joint angles calculated from the marker-based and markerless system agreed with inclinometer measurements by < 0.5 degrees. The systems agreed with each other by