Table 2. Accuracy of movement signals from Kinect landmarks against Vicon marker locations expressed as mean 3D Euclidian distance diff3D, Pearson correlation coefficients r per dimension and signal-to-noise ratio SNR per dimension.
Data are presented as mean and standard deviation (SD) of all measurements (including all subjects, tasks and measurement repetitions).
| Joint name | diff3D [m] | rAP | rML | rV | SNRAP | SNRML | SNRV |
|---|---|---|---|---|---|---|---|
| Head | 0.01 (0.01) | 0.99 (0.05) | 0.90 (0.17) | 0.73 (0.30) | 31.69 (12.41) | 7.90 (5.98) | 4.70 (9.84) |
| Neck | 0.02 (0.01) | 0.99 (0.05) | 0.88 (0.16) | 0.46 (0.52) | 31.37 (11.47) | 6.96 (5.40) | 1.87 (9.56) |
| Spine shoulder | 0.01 (0.01) | 0.99 (0.05) | 0.86 (0.23) | 0.68 (0.37) | 31.30 (11.78) | 6.19 (6.72) | 5.70 (9.07) |
| Spine mid | 0.01 (0.01) | 0.99 (0.05) | 0.85 (0.23) | 0.70 (0.36) | 31.48 (11.89) | 5.51 (6.61) | 5.43 (9.54) |
| Spine base | 0.02 (0.01) | 0.99 (0.02) | 0.81 (0.24) | 0.66 (0.35) | 28.80 (11.78) | 3.24 (5.73) | 2.26 (9.69) |
| Left shoulder | 0.01 (0.01) | 0.99 (0.05) | 0.87 (0.20) | 0.74 (0.28) | 29.03 (12.03) | 6.61 (6.39) | 6.63 (9.06) |
| Left elbow | 0.02 (0.01) | 0.99 (0.02) | 0.89 (0.16) | 0.46 (0.39) | 28.31 (10.83) | 7.39 (5.19) | 1.17 (10.07) |
| Left wrist | 0.02 (0.01) | 0.98 (0.05) | 0.89 (0.15) | 0.80 (0.25) | 25.53 (10.74) | 7.30 (4.87) | 7.06 (8.39) |
| Left hand | 0.03 (0.02) | 0.97 (0.07) | 0.89 (0.13) | 0.76 (0.27) | 23.91 (11.70) | 7.14 (4.54) | 6.44 (8.32) |
| Right shoulder | 0.01 (0.01) | 0.99 (0.05) | 0.89 (0.17) | 0.72 (0.27) | 28.76 (12.37) | 7.13 (5.95) | 5.87 (9.57) |
| Right elbow | 0.02 (0.01) | 0.99 (0.05) | 0.87 (0.18) | 0.51 (0.37) | 28.54 (11.32) | 6.89 (5.88) | 2.56 (9.56) |
| Right wrist | 0.02 (0.02) | 0.98 (0.06) | 0.86 (0.18) | 0.78 (0.25) | 25.98 (11.12) | 6.34 (5.51) | 6.07 (8.86) |
| Right hand | 0.02 (0.02) | 0.97 (0.07) | 0.86 (0.17) | 0.74 (0.29) | 24.83 (12.24) | 6.54 (5.25) | 5.77 (8.58) |
| Left hip | 0.02 (0.01) | 0.99 (0.05) | 0.82 (0.22) | 0.61 (0.35) | 26.53 (10.91) | 4.06 (5.44) | 3.41 (8.41) |
| Left knee | 0.03 (0.02) | 0.87 (0.28) | 0.78 (0.20) | 0.19 (0.41) | 17.28 (12.60) | 2.83 (4.65) | -5.35 (6.38) |
| Left ankle | 0.05 (0.03) | 0.78 (0.35) | 0.64 (0.33) | 0.29 (0.41) | 9.73 (17.71) | -2.46 (9.34) | -7.27 (11.87) |
| Left foot | 0.06 (0.04) | 0.64 (0.46) | 0.47 (0.35) | -0.02 (0.37) | -0.47 (25.15) | -7.25 (11.48) | -14.30 (14.48) |
| Right hip | 0.02 (0.01) | 0.99 (0.05) | 0.81 (0.25) | 0.64 (0.34) | 26.16 (10.68) | 3.97 (5.60) | 3.99 (8.36) |
| Right knee | 0.04 (0.02) | 0.87 (0.28) | 0.80 (0.21) | 0.19 (0.41) | 16.93 (12.64) | 3.60 (5.09) | -5.42 (6.33) |
| Right ankle | 0.05 (0.04) | 0.81 (0.33) | 0.64 (0.32) | 0.22 (0.38) | 8.63 (16.27) | -2.26 (10.25) | -8.33 (12.49) |
| Right foot | 0.07 (0.04) | 0.66 (0.44) | 0.49 (0.36) | -0.03 (0.35) | -1.94 (26.03) | -7.83 (13.17) | -15.83 (14.96) |
r refers to the pearson correlation coefficient. Results are shown as mean values of all assessments, measurement repetitions and subjects. Abbrev: AP—anterio-posterior; ML—medio-lateral; V—vertical