Abstract
This paper presents an improved leg tracking method using a laser range sensor (LRS) for a gait measurement system to evaluate the motor function in walk tests such as the timed up & go test (TUG). The system tracks both legs and measures the trajectory of both legs. Particularly during the turning motion in the TUG, both legs might be close to each other and one leg might be hidden from the sensor. In addition, the moving direction of the leg rapidly changes. These situations are likely to lead to false tracking. To solve these problems, a novel data association method considering the gait phase is proposed. From the experimental results with young people, we confirm that the proposed methods can reduce the chances of false tracking, hi addition, we verify the measurement accuracy of the leg trajectory compared with a three-dimensional motion analysis system (VICON).
