Journal of the Korean Institute of Intelligent Systems (한국지능시스템학회논문지)

Korean Institute of Intelligent Systems (한국지능시스템학회)
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Design of Robust Face Recognition System with Illumination Variation Realized with the Aid of CT Preprocessing Method

CT 전처리 기법을 이용하여 조명변화에 강인한 얼굴인식 시스템 설계

  • Jin, Yong-Tak (Department of Electrical Engineering, The University of Suwon) ;
  • Oh, Sung-Kwun (Department of Electrical Engineering, The University of Suwon) ;
  • Kim, Hyun-Ki (Department of Electrical Engineering, The University of Suwon)
  • Received : 2014.09.14
  • Accepted : 2014.12.05
  • Published : 2015.02.25
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Abstract

In this study, we introduce robust face recognition system with illumination variation realized with the aid of CT preprocessing method. As preprocessing algorithm, Census Transform(CT) algorithm is used to extract locally facial features under unilluminated condition. The dimension reduction of the preprocessed data is carried out by using $(2D)^2$PCA which is the extended type of PCA. Feature data extracted through dimension algorithm is used as the inputs of proposed radial basis function neural networks. The hidden layer of the radial basis function neural networks(RBFNN) is built up by fuzzy c-means(FCM) clustering algorithm and the connection weights of the networks are described as the coefficients of linear polynomial function. The essential design parameters (including the number of inputs and fuzzification coefficient) of the proposed networks are optimized by means of artificial bee colony(ABC) algorithm. This study is experimented with both Yale Face database B and CMU PIE database to evaluate the performance of the proposed system.

본 연구는 조명변화에 강인한 CT 전처리 기법 기반 개선된 얼굴인식 시스템을 소개한다. 전처리 알고리즘으로 CT알고리즘은 조명이 없는 환경에서도 얼굴의 지역적인 특징만을 추출한다. 얼굴의 지역적인 특징 추출을 가능하게 해준다. 처리된 데이터는 $(2D)^2$ 기반 대표적인 차원축소 알고리즘인 PCA를 사용하여 특징을 추출하였다. 전처리 알고리즘을 통한 특징 데이터는 제안한 방사형 기저함수 신경회로망의 입력으로 사용하였다. 방사형 기저함수 신경회로망의 은닉층은 FCM으로 구성하였고, 연결가중치는 1차 선형식을 사용하였다. 또한 ABC 알고리즘을 이용하여 제안된 분류기의 파라미터, 즉 입력의 수, 퍼지 클러스터링의 퍼지화 계수를 최적화 한다. 본 연구는 제안된 시스템의 성능 평가를 위해 Yale Face database B와 CMU PIE database로 실험하였다.

Keywords

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