Comparison of markerless and marker-based motion capture technologies through simultaneous data collection during gait: proof of concept.
Comparison of markerless and marker-based motion capture technologies through simultaneous data collection during gait: proof of concept.
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DOI：
10.1371/journal.pone.0087640
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Cobelli C
中科院分区：
文献类型：
--
作者：
Ceseracciu E;Sawacha Z;Cobelli C
在过去的十年中，无标记运动捕捉技术在生物力学界获得了越来越多的兴趣。然而，在临床领域，无标记技术的应用仍有争议。这主要是由于在三维关节运动学的可重复性方面，致力于与基于标记的运动捕获的现有技术进行比较的论文数量有限。在目前的工作中，无标记技术的应用与标记为基础的系统获得的数据进行了研究。所有视频和外部数据都是用相同的动作捕捉系统记录的，并且可以同时使用无标记和基于标记的方法。三维无标记的关节运动学估计和比较与传统的标记为基础的系统，通过评估关节旋转之间的均方根距离。为了比较无标记和基于标记的系统在临床相关关节角度估计方面的性能，为两种系统定义了相同的解剖参考系。通过对两种技术应用相同的棒校准和透镜失真校正，排除了摄像机校准和同步的差异。膝关节屈曲-伸展角度获得最佳结果，平均均方根距离为11.75度，相当于活动范围的18.35%。髋关节和踝关节的运动学估计值优于其他平面（均方根距离为17.62度，例如44.66%，7.17度，例如33.12%），同时髋关节的估计值最不正确。该技术使无标记技术的使用者能够比较基于标记技术与基于标记技术的差异，以确定无标记技术的适用程度。
During the last decade markerless motion capture techniques have gained an increasing interest in the biomechanics community. In the clinical field, however, the application of markerless techniques is still debated. This is mainly due to a limited number of papers dedicated to the comparison with the state of the art of marker based motion capture, in term of repeatability of the three dimensional joints' kinematics. In the present work the application of markerless technique to data acquired with a marker-based system was investigated. All videos and external data were recorded with the same motion capture system and included the possibility to use markerless and marker-based methods simultaneously. Three dimensional markerless joint kinematics was estimated and compared with the one determined with traditional marker based systems, through the evaluation of root mean square distance between joint rotations. In order to compare the performance of markerless and marker-based systems in terms of clinically relevant joint angles estimation, the same anatomical frames of reference were defined for both systems. Differences in calibration and synchronization of the cameras were excluded by applying the same wand calibration and lens distortion correction to both techniques. Best results were achieved for knee flexion-extension angle, with an average root mean square distance of 11.75 deg, corresponding to 18.35% of the range of motion. Sagittal plane kinematics was estimated better than on the other planes also for hip and ankle (root mean square distance of 17.62 deg e.g. 44.66%, and 7.17 deg e.g. 33.12%), meanwhile estimates for hip joint were the most incorrect. This technique enables users of markerless technology to compare differences with marker-based in order to define the degree of applicability of markerless technique.
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