Optical Motion Capture Systems (OMCSs) are considered the gold standard for kinematic measurement of human movements. However, in situations such as measuring wrist kinematics during a hairdressing activity, markers can be obscured, resulting in a loss of data. Other measurement methods based on non-optical data can be considered, such as magneto-inertial measurement units (MIMUs). Their accuracy is generally lower than that of an OMCS. In this context, it may be worth considering a hybrid system [MIMU + OMCS] to take advantage of OMCS accuracy while limiting occultation problems. The aim of this work was (1) to propose a methodology for coupling a low-cost MIMU (BNO055) to an OMCS in order to evaluate wrist kinematics, and then (2) to evaluate the accuracy of this hybrid system [MIMU + OMCS] during a simple hairdressing gesture. During hair cutting gestures, the root mean square error compared with the OMCS was 4.53° (1.45°) for flexion/extension, 5.07° (1.30°) for adduction/abduction, and 3.65° (1.19°) for pronation/supination. During combing gestures, they were significantly higher, but remained below 10°. In conclusion, this system allows for maintaining wrist kinematics in case of the loss of hand markers while preserving an acceptable level of precision (<10°) for ergonomic measurement or entertainment purposes.

中文翻译：

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确定手腕运动学的混合测量系统的开发和评估

光学运动捕捉系统 (OMCS) 被认为是人体运动运动学测量的黄金标准。然而，在美发活动期间测量手腕运动学等情况下，标记可能会被遮挡，从而导致数据丢失。可以考虑基于非光学数据的其他测量方法，例如磁惯性测量单元（MIMU）。它们的准确度通常低于 OMCS。在这种情况下，可能值得考虑混合系统 [MIMU + OMCS]，以利用 OMCS 精度，同时限制掩星问题。这项工作的目的是 (1) 提出一种将低成本 MIMU (BNO055) 耦合到 OMCS 的方法，以评估手腕运动学，然后 (2) 评估该混合系统 [MIMU + OMCS] 的准确性] 在一个简单的美发手势中。在剪发姿势期间，与 OMCS 相比，屈曲/伸展的均方根误差为 4.53°（1.45°），内收/外展为 5.07°（1.30°），内旋/旋后为 3.65°（1.19°）。在梳理手势期间，它们明显更高，但仍低于 10°。总之，该系统允许在手部标记丢失的情况下保持手腕运动学，同时保持可接受的精度水平（<10°），以实现人体工程学测量或娱乐目的。