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. 2019 Dec 26;14(12):e0227075. doi: 10.1371/journal.pone.0227075

Fig 1. Signal preprocessing.

Fig 1

The signal to which the moving average filters (Hanning filters) are applied (green, blue line) shifts to the right compared to the raw acceleration signal, on the time axis. Step discrimination points are indicated by crosses on the filtered signal. Whether the step is left or right is determined by the sign of the yaw angle at the step discrimination point.