A Caltech Library Service

Silicon retina with adaptive photoreceptors

Mahowald, M. A. (1991) Silicon retina with adaptive photoreceptors. In: Visual Information Processing: From Neurons to Chips. Proceedings of SPIE. No.1473. Society of Photo-optical Instrumentation Engineers (SPIE) , Bellingham, WA, pp. 52-58. ISBN 9780819405821.

[img] PDF - Published Version
See Usage Policy.


Use this Persistent URL to link to this item:


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.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
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.
Funding AgencyGrant Number
Office of Naval Research (ONR)UNSPECIFIED
Systems Development FoundationUNSPECIFIED
California Department of CommerceUNSPECIFIED
Hewlett-Packard CompanyUNSPECIFIED
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Series Name:Proceedings of SPIE
Issue or Number:1473
Record Number:CaltechAUTHORS:20181213-143632626
Persistent URL:
Official Citation:Misha A. Mahowald, "Silicon retina with adaptive photoreceptors," Proc. SPIE 1473, Visual Information Processing: From Neurons to Chips, (9 July 1991); doi: 10.1117/12.45540
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:91811
Deposited By: George Porter
Deposited On:19 Dec 2018 19:16
Last Modified:16 Nov 2021 03:44

Repository Staff Only: item control page