Extraction Method of Driver’s Mental Component Based on Empirical Mode Decomposition and Approximate Entropy Statistic Characteristic in Vehicle Running State

Figure 7

The IMF-ApEn distribution of steering wheel angle and white noise.

(a) IMF1

(b) IMF2

(c) IMF3

(d) IMF4

(e) IMF5

(f) IMF6

(g) IMF7

(h) IMF8