Face recognition by eigenfaces approach

Pao Yue-kong Library Electronic Theses Database

Face recognition by eigenfaces approach

 

Author: Lau, Tse-yim
Title: Face recognition by eigenfaces approach
Degree: M.Sc.
Year: 1999
Subject: Human face recognition (Computer science)
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Electronic Engineering
Pages: 49 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1479263
URI: http://theses.lib.polyu.edu.hk/handle/200/2839
Abstract: We have developed a real-time computer system that can recognize a person by comparing characteristics of the face to those of known individuals. Besides, the system can tackle the problem caused by illumination and scaling. Our approach treats the face recognition problem as an intrinsically two-dimensional (2-D) recognition problem rather than requiring recovery of three-dimensional geometry, taking advantage of the fact that faces are normally upright and thus may be described by a small set of 2-D characteristic views. The system functions by projecting face images onto a feature space that spans the significant variations among known face images. The significant features are known as "eigenfaces', because they are the eigenvectors (principal components) of a set of training faces; they do not necessarily correspond to features such as eyes, ears, and noses. The projection operation characterizes an individual face by a weighted sum of the eigenface features, and hence recognizing a particular face is equivalent to comparing these weights to those of known individuals. In order to solve the problem of various illumination directions, we apply both the intra- and inter-face illumination normalization algorithm to compensate the effect due to different angles of lighting source such that the accuracy of recognition will not be seriously affected. The system will select at most the three most similar faces in a face database to an input face. Besides, a general interpolation-scaling algorithm has been added to the system in order to handle numerous scales of images. Some particular advantages of our approach are that it provides for the ability to learn and later recognize new faces in an unsupervised manner, and that it is easy to implement using neural network architecture.

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