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  • Research Article
  • Open Access

Pushing it to the Limit: Adaptation with Dynamically Switching Gain Control

EURASIP Journal on Advances in Signal Processing20062007:051684

https://doi.org/10.1155/2007/51684

  • Received: 1 December 2005
  • Accepted: 26 August 2006
  • Published:

Abstract

With this paper we propose a model to simulate the functional aspects of light adaptation in retinal photoreceptors. Our model, however, does not link specific stages to the detailed molecular processes which are thought to mediate adaptation in real photoreceptors. We rather model the photoreceptor as a self-adjusting integration device, which adds up properly amplified luminance signals. The integration process and the amplification obey a switching behavior that acts to shut down locally the integration process in dependence on the internal state of the receptor. The mathematical structure of our model is quite simple, and its computational complexity is quite low. We present results of computer simulations which demonstrate that our model adapts properly to at least four orders of input magnitude.

Keywords

  • Information Technology
  • Computer Simulation
  • Computational Complexity
  • Quantum Information
  • Internal State

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Authors’ Affiliations

(1)
Centre de Visiò per Computador, Edifici O, Campus UAB, 08193 Bellaterra, Cerdanyola, Barcelona, Spain
(2)
Computer Science Department, Universitat Autònoma de Barcelona, 08193 Bellaterra, Cerdanyola, Barcelona, Spain

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