A Low-power Neuromorphic System for Retinal Implants and Sensory Substitution

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Title: A Low-power Neuromorphic System for Retinal Implants and Sensory Substitution
Authors: Gaspar, N
Sondhi, A
Evans, B
Nikolic, K
Item Type: Conference Paper
Abstract: This paper describes the design and operation of a system which can be used as a Visual to Auditory Sensory Substitution Device (SSD), as well as the front-end of a real-time retinal prosthesis (RP) or Vision Augmentation (VA) system. Such systems consist of three components: a sensory block to capture the visual scene, a processing block to manage the collected data and generate stimulus patterns, and an output block. For the sensory block we use a Dynamic Vision Sensor (DVS) instead of a conventional camera. A microcontroller is used as the processing block, which receives asynchronous inputs from the DVS in the form of ON/OFF events and treats them like post-synaptic potentials. A simple algorithm based on an Integrate & Fire neuron model is used to emulate temporal contrast sensitive Retinal Ganglion Cells (RGCs). For an RP system the output would be an implanted electrode array, whereas for the SSD a sound is activated based on a certain mapping algorithm. The results are shown in the form of ON or OFF events on the LED matrix (equivalent to the stimulation pattern on an electrode array in the case of an RP), and in the form of a stereo sound output.
Issue Date: 26-Jan-2017
Date of Acceptance: 25-May-2016
URI: http://hdl.handle.net/10044/1/57359
DOI: https://dx.doi.org/10.1109/BioCAS.2016.7833729
ISSN: 2163-4025
Publisher: IEEE
Start Page: 78
End Page: 81
Copyright Statement: © 2016 IEEE.
Sponsor/Funder: Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: 270324
Conference Name: 12th IEEE Biomedical Circuits and Systems Conference (BioCAS)
Keywords: Science & Technology
Computer Science, Information Systems
Engineering, Biomedical
Engineering, Electrical & Electronic
Computer Science
Publication Status: Published
Start Date: 2016-10-17
Finish Date: 2016-10-19
Conference Place: Shanghai, PEOPLES R CHINA
Appears in Collections:Faculty of Engineering
Electrical and Electronic Engineering

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