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LITERATURE SURVEY OF AUTOMATIC FACE RECOGNITION ...

LITERATURE SURVEY OF AUTOMATIC FACE RECOGNITION ...

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Fig.2.2. Process of face recognition.<br />

A face recognition system can identify faces present in images and videos<br />

automatically .It can operate in either or both of two modes: (1) Face<br />

verification( authentication).(2) face identification (recognition).<br />

Face verification involves a one­to­one match that compares a query<br />

face image against a template (model) face image whose identity is being<br />

claimed.<br />

Face<br />

detection<br />

Tracking<br />

Face identification involves a one­to­many match that compares a query<br />

face image against all the template (model) images in the database to determine<br />

the identity of the query face.<br />

2.3.1 Face Recognition Processing<br />

A face recognition system can split into four modules. Face is a three­<br />

dimensional object and face recognition is a visual pattern recognition problem.<br />

For facial recognition purpose the following types of data can be used:<br />

• 2D­Images.<br />

Face<br />

Alignment<br />

• 3D­ images (obtained from laser).<br />

2.3.2 Processing steps before face recognition<br />

1. Detection (Normalization): segment the face from the background.<br />

2. Alignment (Localization): more accurate localization of the face and<br />

scale of each detected face.<br />

Feature<br />

extraction<br />

Feature<br />

matching<br />

Database of<br />

enrolled user<br />

15

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