WSEAS Transactions on Information Science and Applications
Print ISSN: 1790-0832, E-ISSN: 2224-3402
Volume 16, 2019
Application of Multi-Staged Dynamic Time Warping to Upper Limbs Motion Analysis
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Abstract: The method described in this paper can be used to compare three-dimensional upper limbs trajectories between two motion capture (MoCap) recordings. It analysis the kinematic chain using dynamic time warping, starting from hands trajectories, then elbows, arms and finally shoulders. Method generates Dynamic Time Warping align function (DTWaf) of hands which is used to detect local maxima which indicates the part of motions where the highest differences between reference and input recordings are present. Those maxima are used later to compare DTWaf of other body joints and to indicate which body joints caused deviation from the reference. The proposed method is evaluated on dataset containing six exercises performed by a healthy person and persons that suffer cuff muscle pain or shoulder injuries. The results obtained by our method supports the diagnosis of injured subjects which reassures us, that our approach works correctly. The method beside the numerical results enables to generate valuable visualizations that can be used to perform three-dimensional evaluation and comparison of motion ranges between subjects. This approach can be applied for example to support rehabilitation process. By using proposed method physician can easily visualize and measure improvement or deterioration of patient motion abilities comparing it to various reference MoCap.
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Keywords: Motion capture, kinematic chain, dynamic time warping, rehabilitation, motion analysis, signal processing
Pages: 35-48
WSEAS Transactions on Information Science and Applications, ISSN / E-ISSN: 1790-0832 / 2224-3402, Volume 16, 2019, Art. #4