Table 2 Key points distance, signal points distances with thresholds used on distances of rule-based scheme for recognition of most common AUs occurring in the car driving simulator

4

D C_2,7, D C_1,6, D C_1,3, D C_6,8

D C_1,6, D C_6,8, D C_1,3

D C_1,3≤τ₇ OR D C_6,8≤τ₇

12

D C_13,15, D C_13,17, D C_15,17,

D C _15,17

τ₅≤D C_15,17 AND τ₆≤D C_14,16

25

D C_13,18, D C_14,16, D C_15,17

D C_14,16, D C_13,18

τ₂≤D C_14,16≤τ₁

26

D C_13,18, D C_14,16

D C_14,16, D C_13,18

τ₃≤D C_13,18

28

D C_14,16, D C_15,17

D C_13,18, D C_15,17, D C_14,16, D C_13,16, D C_14,18

D C_14,16≤τ₄