Fig. 1: CNN architecture and operation.
From: Facial recognition as a tool to identify Roman emperors: towards a new methodology

a General CNN architecture. Image of Hadrian: © Centre for Art Historical Documentation, Radboud University. b Convolutional layer operation. c Max pooling layer operation. d Fully connected layer operation. b, c and d reprinted from Guo et al. (2016) with permission from Elsevier.