Hors-Série IA 2020

Facial Action Coding System (FACS)

The system was developed in 1970 by the psychologists Paul Ekman and Wallace Friesen.
This coding system represents facial movements.
Contractions and relaxations of the face muscles are defined as action units (AU) and they are identified by a number.
Each number represents the action of one or more face muscles.
FACS is the reference tool to analyse faces.