Journal
SENSORS
Volume 12, Issue 2, Pages 1594-1611Publisher
MDPI
DOI: 10.3390/s120201594
Keywords
gait analysis; image processing; inertial sensors; position estimation
Funding
- National Research Foundation of Korea
- Korean Government [2011-0021978]
- National Research Foundation of Korea [2011-0021978] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this paper, a gait analysis system which estimates step length and foot angles is proposed. A measurement unit, which consists of a camera and inertial sensors, is installed on a shoe. When the foot touches the floor, markers are recognized by the camera to obtain the current position and attitude. A simple planar marker with 4,096 different codes is used. These markers printed on paper are placed on the floor. When the foot is moving off the floor, the position and attitude are estimated using an inertial navigation algorithm. For accurate estimation, a smoother is proposed, where vision information and inertial sensor data are combined. Through experiments, it is shown that the proposed system can both track foot motion and estimate step length.
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