Table 2. Definitions of facial expression factors around certain facial organs.

Subregions	FEFs
Eye factor
Eye corner	D(11,14), D(17,20), D(14,17)
Eyelid	D(12,16), D(12,16), D(18,22), D(19,21)
Eye angle	θ(13,14,15), θ(18,17,22), θ(12,11,16), θ(19,20,21), θ(14,23,5), θ(17,23,6), θ(17,14,5), θ(14,17,6)
Eyebrow factor
Eyebrow	D(5,6), D(5,14), D(6,17), D(1,11), D(10,20)
Eyebrow angle	θ(1,3,5), θ(6,8,10)
Nose factor
Nose	D(27,31), D(27,29), D(29,31), D(26,27), D(26,31), D(26,29), D(23,26), D(25,26)
Nose angle	θ(27,16,31)
Lip factor
Lip	D(32,38), D(32,35), D(32,46), D(38,35), D(38,46)
Outer lip	D(34,47), D(36,45)
Inner lip	D(42,49), D(41,50), D(40,51)
Cross	D(42,47), D(40,45), D(34,49), D(36,51)
Lip corner	θ(33,32,48), θ(37,38,44), θ(42,32,49), θ(40,38,51), θ(34,35,36), θ(33,34,35), θ(35,36,37), θ(47,46,45)
Chin factor
Chin	D(56,59), D(61,64), D(59,61), D(60,26), D(56,64)
Chin corner	θ(57,59,60), θ(63,61,60), θ(59,60,61), θ(54,56,59), θ(66,64,61)

FEFs, facial expression factors.