Gracia-Ibáñez Verónica, Vergara Margarita, Buffi James H, Murray Wendy M, Sancho-Bru Joaquín L
a Department of Mechanical Engineering and Construction , Universitat Jaume I, Castelló , Spain.
b Department of Biomedical Engineering , Physical Medicine and Rehabilitation, and Physical Therapy and Human Movement Sciences, Northwestern University , Chicago , IL , USA.
Comput Methods Biomech Biomed Engin. 2017 May;20(6):587-597. doi: 10.1080/10255842.2016.1265950. Epub 2016 Dec 27.
Motion capture of all degrees of freedom of the hand collected during performance of daily living activities remains challenging. Instrumented gloves are an attractive option because of their higher ease of use. However, subject-specific calibration of gloves is lengthy and has limitations for individuals with disabilities. Here, a calibration procedure is presented, consisting in the recording of just a simple hand position so as to allow capture of the kinematics of 16 hand joints during daily life activities even in case of severe injured hands. 'across-subject gains' were obtained by averaging the gains obtained from a detailed subject-specific calibration involving 44 registrations that was repeated three times on multiple days to 6 subjects. In additional 4 subjects, joint angles that resulted from applying the 'across-subject calibration' or the subject-specific calibration were compared. Global errors associated with the 'across-subject calibration' relative to the detailed, subject-specific protocol were small (bias: 0.49°; precision: 4.45°) and comparable to those that resulted from repeating the detailed protocol with the same subject on multiple days (0.36°; 3.50°). Furthermore, in one subject, performance of the 'across-subject calibration' was directly compared to another fast calibration method, expressed relative to a videogrammetric protocol as a gold-standard, yielding better results.
在日常生活活动中对手部所有自由度进行运动捕捉仍然具有挑战性。仪器手套因其更高的易用性而成为一个有吸引力的选择。然而，手套的个体特定校准过程冗长，并且对残疾个体存在局限性。在此，提出了一种校准程序，该程序仅记录一个简单的手部位置，以便即使在手部严重受伤的情况下，也能在日常生活活动中捕捉16个手部关节的运动学信息。“跨个体增益”是通过对涉及44次配准的详细个体特定校准所获得的增益进行平均得到的，该校准在多天内对6名受试者重复进行了三次。在另外4名受试者中，比较了应用“跨个体校准”或个体特定校准所得到的关节角度。相对于详细的个体特定方案，与“跨个体校准”相关的全局误差较小（偏差：0.49°；精度：4.45°），并且与在多天内对同一受试者重复详细方案所得到的误差（0.36°；3.50°）相当。此外，在一名受试者中，将“跨个体校准”的性能与另一种快速校准方法直接进行了比较，相对于作为金标准的视频测量方案来表示，结果更好。
