A Contrast Sensitive Silicon Retina with Reciprocal Synapses
Abstract
The goal of perception is to extract invariant properties of the underlying world. By computing contrast at edges, the retina reduces incident light intensities spanning twelve decades to a twentyfold variation. In one stroke, it solves the dynamic range problem and extracts relative reflectivity, bringing us a step closer to the goal. We have built a contrast-sensitive silicon retina that models all major synaptic interactions in the outer-plexiform layer of the vertebrate retina using current-mode CMOS circuits: namely, reciprocal synapses between cones and horizontal cells, which produce the antagonistic center/surround receptive field, and cone and horizontal cell gap junctions, which determine its size. The chip has 90 x 92 pixels on a 6.8 x 6.9mm die in 2μm n-well technology and is fully functional.
Additional Information
© 1992 Morgan Kaufmann.Attached Files
Published - 466-a-contrast-sensitive-silicon-retina-with-reciprocal-synapses.pdf
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Additional details
- Eprint ID
- 63786
- Resolver ID
- CaltechAUTHORS:20160119-165146283
- Created
-
2016-01-20Created from EPrint's datestamp field
- Updated
-
2019-10-03Created from EPrint's last_modified field
- Series Name
- Advances in Neural Information Processing Systems
- Series Volume or Issue Number
- 4