Fig. 3From: Pose estimation by extended Kalman filter using noise covariance matrices based on sensor outputLeft lower limb joint angles during walking obtained using optical 3D motion analysis system, the extended Kalman filter using NBS, NBS (Only observation noise), NBS (Only process noise), and the extended Kalman filter using CNC (participant A). a The ankle joint angle. b The knee joint angle. c The hip joint angle.Back to article page