Silicon retina with adaptive photoreceptors
- Creators
- Mahowald, M. A.
- Others:
- Mathur, Bimal P.
- Koch, Christof
Abstract
The central problem faced by the retina is to encode reliably small local differences in image intensity over a several-decade range of background illumination. The distal layers of the retina adjust the transducing elements to make this encoding possible. Several generations of silicon retinae that integrate phototransducers and CMOS processing elements in the focal plane are modeled after the distal layers of the vertebrate retina. A silicon retina with an adaptive photoreceptor that responds with high gain to small spatial and temporal variations in light intensity is described. Comparison with a spatial and temporal average of receptor response extends the dynamic range of the receptor. Continuous, slow adaptation centers the operating point of the photoreceptor around its time-average intensity and compensates for static transistor mismatch.
Additional Information
© 1991 Society of Photo-Optical Instrumentation Engineers (SPIE). Thanks to Carver Mead and Tobi Delbruck for many fruitful discussions. This work was supported by the Office of Naval Research, the National Institute of Health, the Systems Development Foundation, and the State of California Department of Commerce Competitive Technologies Program. Computation was provided by a grant from Hewlett-Packard, and Chip Fabrication was supported by DARPA, through the MOSIS service.Attached Files
Published - 52.pdf
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Additional details
- Eprint ID
- 91811
- Resolver ID
- CaltechAUTHORS:20181213-143632626
- Office of Naval Research (ONR)
- NIH
- Systems Development Foundation
- California Department of Commerce
- Hewlett-Packard Company
- Defense Advanced Research Projects Agency (DARPA)
- Created
-
2018-12-19Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 1473