Silicon models of lateral inhibition
Wolpert, S.; Micheli-Tzanakou, E.
Neural Networks, IEEE Transactions on
Volume 4, Issue 6, Nov 1993 Page(s):955 - 961
Digital Object Identifier 10.1109/72.286890
Summary:The neurological process known as lateral inhibition (LI) has long
been acknowledged as a critical operation for the preprocessing many
types of sensory stimuli. In the mammalian retina, LI is utilized to
enhance visual images by performing differential amplification on the
pixels from which the image is composed. In this study, LI is
implemented using VLSI-based models. These models consist of small
two-dimensional arrays of generalized sensory pixels, each of which
inhibits, and in turn is inhibited by, each of its immediate neighbors.
Two custom CMOS array prototypes circuits have been designed,
fabricated, and characterized. Test results indicate that both circuits
are able to impart contrast to arbitrary two-dimensional geometric
images in a flexible yet stable manner, and do so immediately and
simultaneously. These arrays thus offer a level of performance not
attainable by software methods, making this method well suited for
machine vision systems that utilize parallel architectures
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