A Survey on Linguistic Interpretation of Facial Expressions and Technologies

In recent years, many studies have been conducted for analysis of facial expressions. The importance of facial expressions is particularly evident in sign languages because they help in social communication between deaf and dumb among themselves as well as their interaction with the world. These facial expressions are called Grammatical Facial Expressions (GFEs). In this paper, an overview of several methods used for face tracking based on tracking a set of landmark points projected on the face and also a review of classification techniques that used in order to recognize grammatical expressions. This paper also mentions available datasets that used to facilitate linguistic and computational research on signed languages and the gestural components of spoken languages.