Journal of the Institute of Electronics Engineers of Korea SP (대한전자공학회논문지SP)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Face Recognition Robust to Brightness, Contrast, Scale, Rotation and Translation

밝기, 명암도, 크기, 회전, 위치 변화에 강인한 얼굴 인식

  • Published : 2003.11.01
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Abstract

This paper proposes a face recognition method based on modified Otsu binarization, Hu moment and linear discriminant analysis (LDA). Proposed method is robust to brightness, contrast, scale, rotation, and translation changes. Modified Otsu binarization can make binary images that have the invariant characteristic in brightness and contrast changes. From edge and multi-level binary images obtained by the threshold method, we compute the 17 dimensional Hu moment and then extract feature vector using LDA algorithm. Especially, our face recognition system is robust to scale, rotation, and translation changes because of using Hu moment. Experimental results showed that our method had almost a superior performance compared with the conventional well-known principal component analysis (PCA) and the method combined PCA and LDA in the perspective of brightness, contrast, scale, rotation, and translation changes with Olivetti Research Laboratory (ORL) database and the AR database.

본 논문에서는 변형 Otsu 이진화 방법, Hu 모멘트 및 선형 판별 분석(linear discriminant analysis, LDA)를 기반으로 밝기, 명암도, 크기, 회전 위치 변화에 강인한 얼굴 인식 방법을 제안하고자 한다. 제안한 변형 Otsu 이진화를 사용하여 밝기 및 명암도에 불변한 이진 영상들을 만든다. 그런 후 생성된 얼굴 영상의 경계 영상 및 다단계 이진영상으로부터 총 17개의 Hu 모멘트를 계산한 다음 LDA 방법을 적용하여 최종 특징 벡터를 추출한다. 특히 제안하는 얼굴 인식 방법은 Hu 모멘트를 이용함으로써 크기, 회전 및 위치 변화에도 강인한 특성을 갖고 있다. Olivetti research laboratory (ORL) 데이터베이스와 AR 데이터베이스의 총 100명의 얼굴 영상에 대해 기존의 주요 성문 분석(Principal component analysis, PCA) 방법 및 PCA와 LDA를 결합한 얼굴 인식 방법과 비교 실험한 결과, 제안한 얼굴 인식 방법은 대체적으로 기존 방법보다 뛰어난 인식 성능을 보였다.

Keywords

References

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