Fig 1.
Body tridimensional planes.
Fig 2.
Illustration of exercises (A-E) represent the exercises E1: E5.
Fig 3.
Position and name of Kinect joints.
L, R and C represent Right, Left and Central joints, respectively.
Fig 4.
Illustration of (A) wrist pronation, (B) flexion, and (C) ulnar deviations. Formulation for extracting each deviation is illustrated respectively.
Fig 5.
Distribution of Ankle, Hand, and Elbow in coronal plane: (A) Ankle, (B) Elbow, and (C) Hand. The X-Y values were obtained in the camera space. The black points show the reference value. Outliers are shown with red, and the blue circles indicate data points considered for stability analysis.
Table 1.
Displacement error (mm) for joints that have a similar pose.
Table 2.
Average displacement error (mm) for Elbow, Hand, Shoulder, and Wrist joints.
Fig 6.
MDE errors for Elbow, Hand, Wrist, and Shoulder using (A) Kinect v2 joints at distance 1 (K2D1), and (B) Kinect v2 joints at distance 2 (K2D2).
Fig 7.
Maximum error (MDE) for additional joints provided by Kinect v2.
Measurements at distance (A) D2, and (B) D1.
Table 3.
SSE (mm) for Hand Tip, Thumb, and Neck joints provided by Kinect v2.
Table 4.
MAE and SSE in elbow flexion, shoulder abduction, wrist flexion, wrist pronation, and wrist ulnar deviation.
Fig 8.
(A) Wrist pronation angle during E4K2D2P1. (B-E) Joints used to obtain wrist pronation angle. For frames colored in red, small deviation of joints position results in large deviation of the measured angle.