**2.2 Face detection and recognition**

A first step of any face recognition or visually person identification system is to locate the face in the images. After locating the probable face, researchers use facial features (eyes, nose, nostrils, eyebrows, mouths, leaps, etc.) detection method to detect face accurately [Yang, 2000]. Face recognition or person identification compares an input face image or image features against a known face database or features databases and report match, if any. Following two subsections summarize promising past research works in the field of face detection and recognition.
