TY - JOUR T1 - Face and Gesture Recognition-Appearance Characterization of Linear Lambertian Objects, Generalized Photometric Stereo, and Illumination-Invariant Face Recognition JF - IEEE Transactions on Pattern Analysis and Machine Intelligence Y1 - 2007 A1 - Zhou,S. K A1 - Aggarwal,G. A1 - Chellapa, Rama A1 - Jacobs, David W. VL - 29 CP - 2 ER -