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Spatial Vision$
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Russell L. DeValois and Karen K. DeValois

Print publication date: 1991

Print ISBN-13: 9780195066579

Published to Oxford Scholarship Online: January 2008

DOI: 10.1093/acprof:oso/9780195066579.001.0001

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Why Localized Spatial Frequency Filtering?

Why Localized Spatial Frequency Filtering?

Chapter:
(p.333) 12 Why Localized Spatial Frequency Filtering?
Source:
Spatial Vision
Author(s):

Russell L. De Valois

Karen K. De Valois

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780195066579.003.0012

This chapter argues that visual information is encoded in terms of spatial frequency because the visual world is periodic and can thus be more efficiently encoded in the spatial frequency domain than in the pure space domain. However, insofar as visual patterns are only locally periodic, a local but not a global frequency analysis would take advantage of such redundant patterns. It may well be that spatial periodicities in fact rarely extend over more than a small fraction of the visual field. Thus, spatially localized, patch-by-patch spatial frequency encoding would be most adaptive, more so than more global processing.

Keywords:   spatial vision, visual system, spatial frequency, global frequency

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