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Implications of spatial summation models for processes of contour perception: a geometric perspective

journal contribution
posted on 1978-01-01, 00:00 authored by Terry CaelliTerry Caelli, G A N Preston, E R Howell
Current models of how the visual system extracts contours from an image are based on its ability to encode relative position, element interactions and some form of spatial summation. The interactive process is usually interpreted as a weighting function inversely proportional to interelement distances. In this paper two particular weighting functions were experimentally compared—an exponential decay process (EDP) and the sinc function. Results indicated that the EDP decay parameter predicted local contour extraction better than the sinc function. The problem of contour extraction is phrased in terms of how the visual system extracts tangent vectors, curvature vectors and invariant vector fields from the stimulus. However it is contended that the underlying processes for these geometric operators reside in the cortical network dynamics that include summation. Results support this process and some considerations are given to the neurophysiological bases for these general functions which not only result in contour extraction but also produce orientation tuning curves and illusions.

History

Journal

Vision Research

Volume

18

Issue

6

Pagination

723 - 734

Publisher

Elsevier

Location

Oxford, Eng.

ISSN

0042-6989

eISSN

1878-5646

Language

eng

Publication classification

C1 Refereed article in a scholarly journal

Copyright notice

1978, Pergamon Press

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