Publisher's Synopsis
INTRODUCTION
1.1 Development of Facial Expression Analysis
Facial expression analysis started in the nineteenth century when Darwin wrote a treatise
that established the general principles of expression and the means of expression in
both humans and animals [44]. He grouped various kinds of expressions into different
categories.
The pioneering work for facial expression analysis was done by [53] by defining six
basic emotions: happy, sad, anger, disgust, fear, and surprise, and their subclassification.
These emotions are well-known and universally accepted.
