Emerging Topics in Computer Vision

9.1. Introduction

A face recognition system identifies faces in images and videos automatically using computers. It has a wide range of applications, such as biometric authentication and surveillance, human-computer interaction, and multimedia management. A face recognition system generally consists of four processing parts, as depicted in Figure 9.1: face detection, face alignment, facial feature extraction, and face classification. Face detection provides information about the location and scale of each detected face. In the case of video, the found faces may be tracked. In face alignment, facial components, such as eyes, nose, and mouth, and facial outline are located, and thereby the input face image is normalized in geometry and photometry. ...