involving 198 persons in the gallery and either 198 or 670 time-lapse probe images. PCA-
based methods are used separately for each modality and match scores in the separate face
spaces are combined for multimodal recognition. Major conclusions are: 1) 2D and 3D have
similar recognition performance when considered individually, 2) combining 2D and 3D
results using a simple weighting scheme outperforms either 2D or 3D alone, 3) combining …