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NEUROMORPHIC MOTION SENSING CIRCUITS IN A SILICON RETINA
by
Ko-Chung Tseng
A Dissertation Presented to the
FACULTY OF THE USC GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(ELECTRICAL ENGINEERING)
December 2012
Copyright 2012 Ko-Chung Tseng
Object Description
| Title | Neuromorphic motion sensing circuits in a silicon retina |
| Author | Tseng, Ko-Chung |
| Author email | kochungt@usc.edu;kochungtseng@gmail.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Electrical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2012-07-11 |
| Date submitted | 2012-10-03 |
| Date approved | 2012-10-03 |
| Restricted until | 2012-10-03 |
| Date published | 2012-10-03 |
| Advisor (committee chair) | Parker, Alice C. |
| Advisor (committee member) |
Jenkins, B. Keith Weiland, James |
| Abstract | In the biological retina, the feedback and lateral pathways among retinal neurons construct a complicated network that contributes to motion sensing in the retina. When these complex pathways and diverse retinal cell types collaborate, the retina effectively extracts useful information from the visual scene and communicates it to the brain. A silicon retina with motion sensing may be useful for service robots, autonomous vehicles and other applications that require processing dynamic visual information in real time. Implementing motion sensing in a silicon retina presents many challenges. For engineers trying to model the motion sensing functions of a silicon retina, connectivity is one of the most significant engineering challenges that have to be considered. ❧ For this dissertation research, we implement a portion of the starburst amacrine cell (SAC) and differential motion detection model. We also investigate the importance of the feedback and lateral connections in implementing these motion sensing functions in silicon circuit. To validate the importance of the feedback and lateral pathways in the silicon retina, we first build a portion of a retinal network from photoreceptors to ganglion cells that maintains a hierarchical structure similar to that of the biological retina. Lateral connections with horizontal cells and amacrine cells are implemented, along with feedback within the inner and outer plexiform layers of the retina. We then perform demonstrations by comparing the silicon retina tested to one altered by removing these pathways and observing how the behaviors in the silicon retina are changed. We also compare some of our simulation results with biological data. In this research, we showed that some functions cannot be achieved or performances degrade without feedback and lateral connections. Hence, we concluded that incorporating feedback and lateral connections in the artificial retina helps the performance even though it complicates the retinal network. |
| Keyword | silicon retina; neuromorphic circuit; motion detection |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Provenance | Electronically uploaded by the author |
| Type | texts |
| Legacy record ID | usctheses-m |
| Rights | Tseng, Ko-Chung |
| Access conditions | The author retains rights to his/her dissertation, thesis or other graduate work according to U.S. copyright law. Electronic access is being provided by the USC Libraries in agreement with the author, as the original true and official version of the work, but does not grant the reader permission to use the work if the desired use is covered by copyright. It is the author, as rights holder, who must provide use permission if such use is covered by copyright. The original signature page accompanying the original submission of the work to the USC Libraries is retained by the USC Libraries and a copy of it may be obtained by authorized requesters contacting the repository e-mail address given. |
| Repository name | University of Southern California Digital Library |
| Repository address | USC Digital Library, University of Southern California, University Park Campus MC 7002, 106 University Village, Los Angeles, California 90089-7002, USA |
| Repository email | cisadmin@usc.edu |
| Archival file | uscthesesreloadpub_Volume4/etd-TsengKoChu-1223.pdf |
Description
| Title | Page 1 |
| Full text | NEUROMORPHIC MOTION SENSING CIRCUITS IN A SILICON RETINA by Ko-Chung Tseng A Dissertation Presented to the FACULTY OF THE USC GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (ELECTRICAL ENGINEERING) December 2012 Copyright 2012 Ko-Chung Tseng |
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