Table 2.
Feature variables expressing the facial characteristics.
| Size-related variables | Shape-related variables | |
|---|---|---|
| Face shape | Width: FW33*, FW43 Height: FD(47,51)†, FD(52,51) |
Ratio: FW33/FD(47,51), FW33/FD(52,51), FW43/FD(47,51), FW43/FD(52,51) Angle: FA(33,43,51)¶ |
| Forehead | Height: PDV(6,9)§, PDV(7,9), PDV(6,7), PDV(6,9) |
Angle: PA(6,7,9)¶, PA(9,7)||, PA(9,6), PA(9,12) Ratio: PD(77,9)†/PD(6,9), PDV(7,9)/PDV(6,9) Distance: PD(7,77) |
| Eye | Width: FDH(18,25)‡ Height: FDV(17,26)§ |
Angle: FA(25,18)||, FA(25,17), FA(25,26), FA(17,18), FA(18,17,25) Ratio: FDV(17,26)/FDH(18,25) |
| Nose | Width: FW35, PDH(12,14)‡ Height: PDV(12,14) Distance: PD(12,14) Area: PR(12,14,21)** |
Angle: PA(14,12), PA(14,21), PA(12,14,21) Ratio: FD(52,49)/FW35 |
| Mouth | Width: FW40 | Height: FDV(38,50) |
FWn: distance from a point n to the central vertical line in a frontal image.
FD(n1, n2) (or PD(n1, n2)): distance between point n1 and n2 in a frontal (or profile) image.
FDH(n1, n2) (or PDH(n1, n2)): horizontal distance between n1 and n2 in a frontal (or profile) image.
§FDV(n1, n2) (or PDV(n1, n2)): vertical distance between n1 and n2 in a frontal (or profile) image.
||FA(n1, n2) (or PA(n1, n2)): angle between the line through two points, n1 and n2, and a horizontal line in a frontal (or profile) image.
¶FA(n1, n2, n3) (or PA(n1, n2, n3)): angle between three points, n1, n2 and n3, in a frontal (or profile) image.
PR(n1, n2, n3): area of the triangle formed by three points, n1, n2, and n3, in a profile image.