Illumination Modeling and Normalization for Face Recognition

In this paper, we present a general framework for face modeling under varying lighting conditions. First, we show that a face lighting subspace can be constructed based on three or more training face images illuminated by non-coplanar lights. The lighting of any face image can be represented as a point in this subspace. Second, we show that the extreme rays, i.e. the boundary of an illumination cone, cover the entire light sphere. Therefore, a relatively sparsely sampled face images can be used to build a face model instead of calculating each extremely illuminated face image. Third, we present a face normalization algorithm, illumination alignment, i.e. changing the lighting of one face image to that of another face image. Experiments are presented.

• Type: Conference
• Year: 2003
• Where: AMFG
• Authors: Haitao Wang, Stan Z. Li, Yangsheng Wang, Weiwei Zhang
• Keywords: AMFG 2003, Biometrics, Face Image, Face Lighting Subspace, Face Modeling