The accuracy of conventional 2D video for quantifying upper limb kinematics in repetitive motion occupational tasks.
The accuracy of conventional 2D video for quantifying upper limb kinematics in repetitive motion occupational tasks.
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DOI：
10.1080/00140139.2015.1051594
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发表时间：
2015
期刊：
影响因子：
2.4
通讯作者：
Radwin RG
中科院分区：
文献类型：
--
作者：
Chen CH;Azari DP;Hu YH;Lindstrom MJ;Thelen D;Yen TY;Radwin RG
研究了无标记二维视频跟踪作为一种实用的手段来测量上肢运动学的人机工程学评价。手部活动水平（HAL）可以从速度和占空比来估计。使用互相关模板匹配算法跟踪上肢上的感兴趣区域来测量准确性。10名参与者在不同HAL（2、4和5）和负荷（2.2 N、8.9 N和17.8 N）的情况下执行了起搏负荷转移任务。从2D视频测量的速度和加速度与使用3D红外运动捕捉的地面实况测量进行了比较。2D视频和3D运动捕捉之间的绝对差值中位数为速度86.5 mm/s，加速度591 mm/s2，当摄像机平移和倾斜在±30度范围内时，速度小于93 mm/s，加速度小于656 mm/s2。单摄像机2D视频具有足够的精度（< 100 mm/s）用于评估HAL。这项研究表明，当摄像机位于运动平面±30度范围内时，与模拟重复运动任务的3D运动捕获相比，2D视频跟踪具有足够的准确度来测量HAL，以确定重复运动的美国政府工业卫生学家会议阈值限值®。
Marker-less 2D video tracking was studied as a practical means to measure upper limb kinematics for ergonomics evaluations. Hand activity level (HAL) can be estimated from speed and duty cycle. Accuracy was measured using a cross correlation template-matching algorithm for tracking a region of interest on the upper extremities. Ten participants performed a paced load transfer task while varying HAL (2, 4, and 5) and load (2.2 N, 8.9 N and 17.8 N). Speed and acceleration measured from 2D video were compared against ground truth measurements using 3D infrared motion capture. The median absolute difference between 2D video and 3D motion capture was 86.5 mm/s for speed, and 591 mm/s2 for acceleration, and less than 93 mm/s for speed and 656 mm/s2 for acceleration when camera pan and tilt were within ±30 degrees. Single-camera 2D video had sufficient accuracy (< 100 mm/s) for evaluating HAL. This study demonstrated that 2D video tracking had sufficient accuracy to measure HAL for ascertaining the American Conference of Government Industrial Hygienists Threshold Limit Value® for repetitive motion when the camera is located within ±30 degrees off the plane of motion when compared against 3D motion capture for a simulated repetitive motion task.