Research Article

Effectiveness of Variable-Gain Kalman Filter Based on Angle Error Calculated from Acceleration Signals in Lower Limb Angle Measurement with Inertial Sensors

Figure 3

Evaluation results of RMSE of measured inclination angles during treadmill walking. Average values obtained from the results of 5 trials of all subjects are shown for each walking speed.
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(a) Foot inclination angle  
398042.fig.003b
(b) Shank inclination angle
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(c) Thigh inclination angle