Skip to main content

Table 2 Average (standard deviation) of the gait variables calculated for the motion capture and video data using the three pose tracking algorithms

From: Concurrent validity of human pose tracking in video for measuring gait parameters in older adults: a preliminary analysis with multiple trackers, viewing angles, and walking directions

Gait variable Motion capture AlphaPose OpenPose Detectron
Front view walks Back view walks Front view walks Back view walks Front view walks Back view walks Front view walks Back view walks
Top camera Eye-level camera Top camera Eye-level camera Top camera Eye-level camera Top camera Eye-level camera Top camera Eye-level camera Top camera Eye-level camera
Cadence (steps per minute) 106.44 (8.10) 105.30 (8.98) 106.23 (9.14) 106.51 (8.62) 105.63 (9.39) 105.26 (9.30) 106.22 (9.14) 106.51 (8.62) 105.63 (9.40) 105.26 (9.29) 106.23 (9.14) 106.52 (8.62) 105.63 (9.39) 105.26 (9.29)
Step time (s) 0.57 (0.06) 0.58 (0.07) 0.57 (0.10) 0.57 (0.06) 0.58 (0.17) 0.58 (0.07) 0.57 (0.10) 0.57 (0.06) 0.58 (0.17) 0.58 (0.07) 0.57 (0.10) 0.57 (0.06) 0.58 (0.17) 0.58 (0.07)
Step width (m)* 0.09 (0.05) 0.10 (0.04) 0.63 (0.20) 0.62 (0.20) 0.55 (0.16) 0.54 (0.16) 0.62 (0.46) 0.67 (0.29) 0.59 (0.23) 0.54 (0.22) 0.66 (0.19) 0.64 (0.19) 0.86 (1.92) 0.54 (0.15)
CV step time 0.06 (0.03) 0.06 (0.04) 0.13 (0.10) 0.06 (0.02) 0.16 (0.18) 0.06 (0.03) 0.13 (0.10) 0.06 (0.02) 0.16 (0.18) 0.06 (0.03) 0.13 (0.10) 0.06 (0.02) 0.16 (0.18) 0.06 (0.03)
CV step width 0.42 (0.21) 0.37 (0.16) 0.27 (0.08) 0.30 (0.07) 0.27 (0.08) 0.28 (0.07) 0.38 (0.21) 0.38 (0.12) 0.37 (0.10) 0.39 (0.09) 0.25 (0.07) 0.28 (0.06) 0.29 (0.12) 0.27 (0.08)
eMOS (m)a 0.04 (0.02) 0.04 (0.02) 0.25 (0.12) 0.23 (0.10) 0.22 (0.09) 0.21 (0.08) 0.33 (0.14) 0.30 (0.14) 0.28 (0.12) 0.25 (0.11) 0.25 (0.12) 0.23 (0.09) 0.40 (0.15) 0.21 (0.09)
  1. aNote that except for cadence and step time, the values calculated from the pose tracking algorithms are dimensionless (normalized by hip width) and cannot be directly compared with motion capture values