Abstract
This is a technical survey of the researches on synthesizing a model of the visual system of an animal, or an electronic eye such as a pattern recognizer for which ingenious mechanisms of biological systems are heuristics. These researches are reviewed from a standpoint of visual information processing.
This survey includes the models of photoreceptors, the models of neural interactions, in a retina, the models of the visual feature extraction from optical patterns, and the models of the recognizing system which have an ability to learn characters or figures.
