Kinematic analysis of human walking gait using digital image processing |
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Authors: | M O'Malley D Lynn A M de Paor |
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Institution: | (1) Department of Electronic & Electrical Engineering, University College, Belfield, 4 Dublin, Ireland |
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Abstract: | A system using digital image processing techniques for kinematic analysis of human gait has been developed. The system is
cheap, easy to use, automated and provides useful detailed quantitative information to the medical profession. Passive markers
comprising black annuli on white card are placed on the anatomical landmarks of the subject. Digital images at the standard
television rate of 25 per second are acquired of the subject walking past a white background. The images are obtained, stored
and processed using standard commercially available hardware, i.e. video camera, video recorder, digital framestore and an
IBM PC. Using a single-threshold grey level, all the images are thresholded to produce binary images. An automatic routine
then uses a set of pattern recognition algorithms to locate accurately and consistently the markers in each image. The positions
of the markers are analysed to determine to which anatomical landmark they correspond, and thus a stick diagram for each image
is obtained. There is also a facility where the positions of the markers may be entered manually and errors corrected. The
results may be presented in a variety of ways: stick diagram animation, sagittal displacement graphs, flexion diagrams and
gait parameters. |
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Keywords: | Digital image processing Gait analysis Kinematics Pattern recognition |
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