Definition
Face Descriptors is a Data Type representing the features of the Face of an Entity. with the Actions Units of the Facial Action Coding System (FACS) originally developed by Carl-Herman Hjortsjö, adopted by Paul Ekman and Wallace V. Friesen (1978) and updated by Ekman, Friesen, and Joseph C. Hager (2002).
Syntax
https://schemas.mpai.community/PAF/V1.1/data/FaceDescriptors.json
Semantics
| AU | Description | Facial muscle generating the Action |
| 1 | Inner Brow Raiser | Frontalis, pars medialis |
| 2 | Outer Brow Raiser | Frontalis, pars lateralis |
| 4 | Brow Lowerer | Corrugator supercilii, Depressor supercilii |
| 5 | Upper Lid Raiser | Levator palpebrae superioris |
| 6 | Cheek Raiser | Orbicularis oculi, pars orbitalis |
| 7 | Lid Tightener | Orbicularis oculi, pars palpebralis |
| 9 | Nose Wrinkler | Levator labii superioris alaquae nasi |
| 10 | Upper Lip Raiser | Levator labii superioris |
| 11 | Nasolabial Deepener | Zygomaticus minor |
| 12 | Lip Corner Puller | Zygomaticus major |
| 13 | Cheek Puffer | Levator anguli oris (a.k.a. Caninus) |
| 14 | Dimpler | Buccinator |
| 15 | Lip Corner Depressor | Depressor anguli oris (a.k.a. Triangularis) |
| 16 | Lower Lip Depressor | Depressor labii inferioris |
| 17 | Chin Raiser | Mentalis |
| 18 | Lip Puckerer | Incisivii labii superioris and Incisivii labii inferioris |
| 20 | Lip stretcher | Risorius with platysma |
| 22 | Lip Funneler | Orbicularis oris |
| 23 | Lip Tightener | Orbicularis oris |
| 24 | Lip Pressor | Orbicularis oris |
| 25 | Lips part | Depressor labii inferioris or relaxation of Mentalis, or Orbicularis oris |
| 26 | Jaw Drop | Masseter, relaxed Temporalis and internal Pterygoid |
| 27 | Mouth Stretch | Pterygoids, Digastric |
| 28 | Lip Suck | Orbicularis oris |
| 41 | Lid droop | Relaxation of Levator palpebrae superioris |
| 42 | Slit | Orbicularis oculi |
| 43 | Eyes Closed | Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis |
| 44 | Squint | Orbicularis oculi, pars palpebralis |
| 45 | Blink | Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis |
| 46 | Wink | Relaxation of Levator palpebrae superioris; Orbicularis oculi, pars palpebralis |
| 61 | Eyes turn left | Lateral rectus, medial rectus |
| 62 | Eyes turn right | Lateral rectus, medial rectus |
| 63 | Eyes up | Superior rectus, Inferior oblique |
| 64 | Eyes down | Inferior rectus, Superior oblique |
