Barlow-Levick Motion Selective Silicon Retina
Biological retinas extract spatial and temporal features in an attempt to
reduce the complexity of performing visual tasks. We built and tested
a silicon retina which encodes several useful temporal features found in
vertebrate retinas. The cells in our silicon retina are selective to direction,
highly sensitive to positive contrast changes around an ambient light level,
and tuned to a particular velocity. Inhibitory connections in the null direction
perform the direction selectivity we desire. This silicon retina is on a
4.6 by 6.8mm die and consists of a 47 by 41 array of pixels, each of which is tuned to respond to the same horizontal direction of motion.
Tobi Delbruck
September 13, 2007