A visual feature extraction system comprising electric circuit models having a similar construction with the visual system of higher animals. The system comprises analog threshold elements as the corresponding elements to visual neuron cells. An analog threshold element is composed in a manner that to each of a plurality of its inputs an interconnecting coefficient is allocated respectively and if an algebraic sum of all of the inputs is positive, a weighted sum of the inputs is derived as the output, and if the algebraic sum is negative, the output becomes zero.
VISUAL FEATURE EXTRACTION SYSTEM FOR CHARACTERS AND PATTERNS