Figure 4.

Illustration of the gait event estimation for ear-worn IMUs using the Diao Improved algorithm. A Singular Spectrum Analysis (SSA) is used to decompose the acceleration signal. (a) Acceleration signals with repetitive gait pattern. (b) Dominant oscillation of the superior–inferior (SI) is used to estimate IC events. Laterality of ICs is determined by using the dominant oscillation of the mediolateral (ML) axis. In contrast, the Diao Original approach used the trend-removed ML signal (green line) to determine laterality. (c) Trend-removed ML signal used to estimate the terminal contacts (TC).