Low-resolution face recognition

Pao Yue-kong Library Electronic Theses Database

Low-resolution face recognition


Author: Qu, Tong
Title: Low-resolution face recognition
Degree: M.Sc.
Year: 2013
Subject: Human face recognition (Computer science)
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Engineering
Pages: x, 88 p. : ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2644310
URI: http://theses.lib.polyu.edu.hk/handle/200/7117
Abstract: Among face-recognition (FR) problems, the identification of low-resolution (LR) face images is still a challenging task. Traditional FR algorithms cannot work satisfactorily in matching LR probe images to high-resolution (HR) gallery images. To perform this matching, there are three standard approaches: (1) down-sample the gallery images and then perform the matching of LR face images; (2) upscale the probe images using super-resolution (SR) methods and then perform the matching of HR face images; and (3) project the LR probe images and the HR gallery images into a common subspace and then perform matching in the subspace. In this project, traditional algorithms based on the first two approaches will first be introduced and evaluated under different resolutions. The four baseline FR algorithms are PCA, also known as eigenfaces, combined PCA and LDA (PCA+LDA, a variant of fisherfaces), the PCA+LDA-based FR algorithm based on Gabor features (G-PCA+LDA), and LGBPHS. The three baseline SR algorithms are the bicubic interpolation, eigentransformation and Coherent Local Linear Reconstruction Super-resolution (CLLR-SR). After that, a coupled-projection method based on Canonical Correlation Analysis (CCA) is proposed and evaluated. Experiments show that the coupled-projection method produces higher identification rates than other FR methods do.

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