Basically there are two approaches to simulation. The first type involves the analysis of the “real” system, so as to identify the critical processes performed by the system. The second type is not concerned at all with the processes performed by the “real” system but is solely interested in the input and output of the system. The objective of this presentation is to introduce a model of the human visual system, based upon the first form of simulation. More specifically, the model is directed toward the pattern recognition, discrimination, and classification processes of the human visual system.