Facial Action Coding System (FACS) – A Visual Guidebook

출처: https://imotions.com/blog/facial-action-coding-system/

다시 정리 예정. 

Main Action Units

Action Unit	Description	Facial Muscle	Example (Hover to Play)
1	Inner Brow Raiser	Frontalis, pars medialis	GIF
2	Outer Brow Raiser (unilateral, right side)	Frontalis, pars lateralis	GIF
4	Brow Lowerer	Depressor Glabellae, Depressor Supercilli, Currugator	GIF
5	Upper Lid Raiser	Levator palpebrae superioris	GIF
6	Cheek Raiser	Orbicularis oculi, pars orbitalis	GIF
7	Lid Tightener	Orbicularis oculi, pars palpebralis	GIF
9 (also shows slight AU4 and AU10)	Nose Wrinkler	Levator labii superioris alaquae nasi	GIF
10 (also shows slight AU25)	Upper Lip Raiser	Levator Labii Superioris, Caput infraorbitalis	GIF
11	Nasolabial Deepener	Zygomatic Minor
12	Lip Corner Puller	Zygomatic Major	GIF
13	Cheek Puffer	Levator anguli oris (Caninus)	GIF
14	Dimpler	Buccinator
15	Lip Corner Depressor	Depressor anguli oris (Triangularis)	GIF
16 (with AU25)	Lower Lip Depressor	Depressor labii inferioris
17	Chin Raiser	Mentalis	GIF
18 (with slight AU22 and AU25)	Lip Puckerer	Incisivii labii superioris and Incisivii labii inferioris	GIF
20	Lip stretcher	Risorius	GIF
22 (with AU25)	Lip Funneler	Orbicularis oris	GIF
23	Lip Tightener	Orbicularis oris
24	Lip Pressor	Orbicularis oris	GIF
25	Lips part	Depressor Labii, Relaxation of Mentalis (AU17), Orbicularis Oris
26 (with AU25)	Jaw Drop	Masetter; Temporal and Internal Pterygoid relaxed	GIF
27	Mouth Stretch	Pterygoids, Digastric	GIF
28 (with AU26)	Lip Suck	Orbicularis oris	GIF
41	Lid droop	Relaxation of Levator Palpebrae Superioris
42	Slit	Orbicularis oculi	GIF
43	Eyes Closed	Relaxation of Levator Palpebrae Superioris	GIF
44	Squint	Orbicularis oculi, pars palpebralis
45	Blink	Relaxation of Levator Palpebrae and Contraction of Orbicularis Oculi, Pars Palpebralis.	GIF
46	Wink	Levator palpebrae superioris; Orbicularis oculi, pars palpebralis	GIF

 

Head Movement Action Units

Action Unit	Description	Example (Hover to Play)
51	Head Turn Left	GIF
52	Head Turn Right	GIF
53	Head Up	GIF
54	Head Down	GIF
55	Head Tilt Left	GIF
56	Head Tilt Right	GIF
57	Head Forward	GIF
58	Head Back	GIF

 

Eye Movement Action Units

Action Unit	Description	Example (Hover to Play)
51	Eyes Turn Left	GIF
51	Eyes Turn Right	GIF
51	Eyes Up	GIF
51	Eyes Down	GIF

Emotions and Action Units

The Action Units described above show the different movements of facial muscles. Certain combined movements of these facial muscles pertain to a displayed emotion. Emotion recognition is completed in iMotions using Affectiva or Emotient, which uses the collection of certain action units to provide information about which emotion is being displayed. For example, happiness is calculated from the combination of action unit 6 (cheek raiser) and 12 (lip corner puller). A complete list of these combinations and the emotion that they relate to is shown below. The gifs on the right are shown in the same order that the action units listed.

Emotion	Action Units	Description	Examples (Hover to Play)
Happiness / Joy	6 + 12	Cheek Raiser, Lip Corner Puller	GIF
Sadness	1 + 4 + 15	Inner Brow Raiser, Brow Lowerer, Lip Corner Depressor	GIF GIF GIF
Surprise	1 + 2 + 5 + 26	Inner Brow Raiser, Outer Brow Raiser, Upper Lid Raiser, Jaw Drop	GIF GIF GIF GIF
Fear	1 + 2 + 4 + 5 + 7 + 20 + 26	Inner Brow Raiser, Outer Brow Raiser, Brow Lowerer, Upper Lid Raiser, Lid Tightener, Lip Stretcher, Jaw Drop	GIF GIF GIF GIF GIF GIF GIF
Anger	4 + 5 + 7 + 23	Brow Lowerer, Upper Lid Raiser, Lid Tightener, Lip Tightener	GIF GIF GIF GIF
Disgust	9 + 15 + 16	Nose Wrinkler, Lip Corner Depressor, Lower Lip Depressor	GIF GIF GIF
Contempt	12 + 14 (on one side of the face)	Lip Corner Puller, Dimpler	GIF GIF