Facial Action Coding System (FACS)
Classifying Facial Actions
This means FACS can be used to describe any possible set of facial movements. Originally developed by Dr. Paul Ekman, Dr. Wallace Friesen, and Dr. The basic unit of measurement in FACS is the action unit. AU An AU represents the muscular activities that produce momentary changes in facial appearances. The mapping between AUs and facial muscles is not necessarily 1-to-1; some AUs are composed of more than one muscle, and other AUs describe separate movements of the same muscle.
Is FACS Training right for you?
Emotion can be defined as any relatively brief conscious experience characterized by intense mental activity and a high degree of pleasure or displeasure. Scientific discourse has drifted to other meanings and there is no consensus on a single definition. Emotion is often intertwined with mood, temperament, personality, disposition, and motivation.
This system is widely used in behavioral investigations of emotion, cognitive processes, and social interaction. The coding is presently performed by highly trained human experts. This paper explores and compares techniques for automatically recognizing facial actions in sequences of images. These techniques include analysis of facial motion through estimation of optical flow; holistic spatial analysis, such as principal component analysis, independent component analysis, local feature analysis, and linear discriminant analysis; and methods based on the outputs of local filters, such as Gabor wavelet representations and local principal components. Performance of these systems is compared to naive and expert human subjects.