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| Research article summary (published 30 Dec 2001): |
Energy and phase orientation mechanisms: a computational model.
Full Abstract
A computational model is proposed for spatial orientation processing beyond the initial stage of linear filtering in visual cortex. The model accounts for orientation pop-out, edge location and orientation, and bar location and orientation. It naturally extends to higher order orientation symmetries. The model is consistent with much of the current understanding of early processing in mammalian visual cortex. It builds on the notions of orientation and spatial frequency specific simple cells, any subsequent non-linearity, and orientation 'pooling'. The processing treats simple cell energy, real, and imaginary responses in a unified way to generate 'feature maps'. The 'pooling' operation in each case is a discrete Fourier transform of the simple cell responses over orientation. The suggested processing has implications for psychophysics (e.g. providing an explanation of why orientation discrimination thresholds are more than an order of magnitude less than simple cell orientation bandwidths), provides some understanding of the variety of 'complex-cell' properties found in visual cortex, and provides a plausible starting point for subsequent processing.
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Author information
Author/s: Atherton, T J (TJ);
Affiliation: Department of Computer Science, University of Warwick, UK. tja(-atsign-)dcs.warwick.ac.uk
Journal and publication information
Publication Type: Journal Article
Journal: Spatial vision (Spat Vis), published in Netherlands. (Language: eng)
Reference: 2002-; vol 15 (issue 4) : pp 415-41
Dates: Created 2002/11/18; Completed 2003/01/06; Revised 2004/11/17;
PMID: 12434822, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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