Fig. 2: Tremor frequency analysis.
From: Validation and application of computer vision algorithms for video-based tremor analysis
a In the postural tremor condition, Mediapipe (MP) demonstrates strong correlations with accelerometer measurements (AM), similar to motion capture (MC), when estimating tremor frequencies (MP: r = 0.40, p < 0.05, MC: r = 0.46, p < 0.01). b Accuracies of postural tremor frequency measurements were calculated to be −0.34 Hz for motion capture and −0.21 Hz for Mediapipe. Bland–Altman plots revealed no systematic relationship of error and measurement magnitudes. c Absolute errors of postural tremor frequency measurements are equivalent to motion capture. d In the kinetic tremor condition, Mediapipe and motion capture-derived frequencies showed similar correlation strengths to accelerometric frequency measurements (ρ = 0.38, p < 0.05). e Accuracies of kinetic tremor frequency measurements were calculated to be −0.22 Hz for motion capture and −0.06 Hz for Mediapipe, however both with systematic relationships of error and measurement magnitudes. f Absolute errors of kinetic tremor frequency measurements are equivalent to motion capture.
