In accordance with rapid population growth throughout the world, facial detection technology
plays a more significant and crucial role in our daily lives, namely in such aspects as criminal
investigations, login systems, entrance systems, etc. Face detection accuracy is influenced by
different variations in classifying a target object in an image; this may include pose variation and
facial occlusion. The challenges of face detection will be discussed in later sections of this chapter.
The following factors explain the importance of face detection