UNSPECIFIED (2002) Energy and phase orientation mechanisms: a computational model. In: Annual Conference of the Applied-Vision-Association, 2001, LONDON, ENGLAND.

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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.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QH Natural history > QH301 Biology B Philosophy. Psychology. Religion > BF Psychology
Journal or Publication Title:	SPATIAL VISION
Publisher:	VSP BV
ISSN:	0169-1015
Date:	2002
Volume:	15
Number:	4
Number of Pages:	27
Page Range:	pp. 415-441
Publication Status:	Published
Title of Event:	Annual Conference of the Applied-Vision-Association
Location of Event:	LONDON, ENGLAND
Date(s) of Event:	2001
URI:	http://wrap.warwick.ac.uk/id/eprint/10377

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