Subject-specific body segment parameter estimation using 3D photogrammetry with multiple cameras.

Subject-specific body segment parameter estimation using 3D photogrammetry with multiple cameras.
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DOI:
10.7717/peerj.831
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发表时间:
2015
期刊:
影响因子:
2.7
通讯作者:
Sellers WI
Sellers WI
中科院分区:
生物学3区
文献类型:
--
作者:
Peyer KE;Morris M;Sellers WI

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当研究人体的运动时,身体部分的惯性特性,例如质量、质心或惯性矩,是重要的参数。然而,这些量不能直接测量。目前的方法包括使用精度有限的回归模型:具有冗长测量程序的几何模型或获取和后处理参与者的MRI扫描。我们提出了一种几何方法的基础上,使用多个摄像机的三维摄影测量,提供特定的主体部分参数,同时最大限度地减少与参与者的互动时间。一个低成本的身体扫描仪,建立使用多个摄像机和三维点云数据生成的结构从运动摄影重建算法。点云被手动分成身体部分,并对每个部分应用凸壳,以产生所需的几何轮廓。该方法的精度可以通过选择身体段的细分数量来调整。六个参与者(四男两女)的身体部分参数,提出了使用所提出的方法。预计多相机摄影测量方法特别适合于研究,包括文献中没有回归模型的人群,以及由于时间或伦理限制而不适用其他几何技术或MRI扫描的人群。
Inertial properties of body segments, such as mass, centre of mass or moments of inertia, are important parameters when studying movements of the human body. However, these quantities are not directly measurable. Current approaches include using regression models which have limited accuracy: geometric models with lengthy measuring procedures or acquiring and post-processing MRI scans of participants. We propose a geometric methodology based on 3D photogrammetry using multiple cameras to provide subject-specific body segment parameters while minimizing the interaction time with the participants. A low-cost body scanner was built using multiple cameras and 3D point cloud data generated using structure from motion photogrammetric reconstruction algorithms. The point cloud was manually separated into body segments, and convex hulling applied to each segment to produce the required geometric outlines. The accuracy of the method can be adjusted by choosing the number of subdivisions of the body segments. The body segment parameters of six participants (four male and two female) are presented using the proposed method. The multi-camera photogrammetric approach is expected to be particularly suited for studies including populations for which regression models are not available in literature and where other geometric techniques or MRI scanning are not applicable due to time or ethical constraints.
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