CSI-HC: A WiFi-Based Indoor Complex Human Motion Recognition Method

Figure 6

Data before and after comparison by the Butterworth low-pass filter: (a) channel 1 outlier 1; (b) after the Butterworth low-pass filtering of outlier 1; (c) channel 2 outlier 2; (d) after the Butterworth low-pass filtering of outlier 2.

(a)

(b)

(c)

(d)