Journal of Shanghai University(Natural Science Edition) ›› 2014, Vol. 20 ›› Issue (4): 489-497.doi: 10.3969/j.issn.1007-2861.2014.01.023

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Algorithm for Processing Optically Captured Motion Data

SHI Juan1, WANG De-yu1,2, TANG Gang1   

  1. 1. School of Logistics Engineering, Shanghai Maritime University, Shanghai 201306, China;
    2. Hangzhou State Power Machinery Research & Design Institute Co., Ltd., Hangzhou 310030, China
  • Received:2013-09-09 Online:2014-08-25 Published:2014-08-25

Abstract: Coordinate values of the markers arranged on the lower extremity of the experimental subject were recorded using an optical motion capture system. Reaction force from the outside was measured with a load board. A program was developed using Matlab to import the above data to quickly calculate the coordinates, displacement, velocity and acceleration of the barycenter in segments of the lower extremity. The joint angle, angular velocity, angular acceleration, joint force, torque and other motion parameters were also calculated. With existing analysis software, the processing methods were complicated and time consuming. This study aims to solve the problem. Using polynomial fitting, curves of various parameters are smoothed, and correctness of the algorithm is verified by comparing the processing results with those generated by Visual 3D software.

Key words: fast calculation, Matlab, polynomial fitting, optical motion capture system

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