| Silicon retina with correlation-based, velocity-tuned pixels. | |
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MedLine Citation:
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PMID: 18267755 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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A functional two-dimensional silicon retina that computes a complete set of local direction-selective outputs is reported. The chip motion computation uses unidirectional delay lines as tuned filters for moving edges. Photoreceptors detect local changes in image intensity, and the outputs from these photoreceptors are coupled into the delay line, where they propagate with a particular speed in one direction. If the velocity of the moving edges matches that of the delay line, then the signal on the delay line is reinforced. The output of each pixel is the power in the delay line signal, computed within each pixel. This power computation provides the essential nonlinearity for velocity selectivity. The delay line architecture differs from the usual pairwise correlation models in that motion information is aggregated over an extended spatiotemporal range. As a result, the detectors are sensitive to motion over a wide range of spatial frequencies. The design of functional one- and two-dimensional silicon retinas with direction-selective, velocity-tuned pixels is described. It is shown that pixels with three hexagonal directions of motion selectivity are approximately (225 mum)(2) in area in a 2-mum CMOS technology and consume less than 5 muW of power. |
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Authors:
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T Delbruck |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: IEEE transactions on neural networks / a publication of the IEEE Neural Networks Council Volume: 4 ISSN: 1045-9227 ISO Abbreviation: IEEE Trans Neural Netw Publication Date: 1993 |
Date Detail:
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Created Date: 2008-02-12 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101211035 Medline TA: IEEE Trans Neural Netw Country: United States |
Other Details:
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Languages: eng Pagination: 529-41 Citation Subset: - |
Affiliation:
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California Inst. of Technol., Pasadena, CA. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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