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Reliable disparity estimation through selective integration

Published online by Cambridge University Press:  01 March 1998

MICHAEL S. GRAY
Affiliation:
Department of Cognitive Science, University of California, San Diego, La Jolla Howard Hughes Medical Institute, Computational Neurobiology Laboratory, The Salk Institute, San Diego
ALEXANDRE POUGET
Affiliation:
Georgetown Institute for Cognitive and Computational Sciences, Georgetown University, Washington, DC
RICHARD S. ZEMEL
Affiliation:
Department of Psychology, University of Arizona, Tucson
STEVEN J. NOWLAN
Affiliation:
Lexicus, Inc., Palo Alto
TERRENCE J. SEJNOWSKI
Affiliation:
Howard Hughes Medical Institute, Computational Neurobiology Laboratory, The Salk Institute, San Diego Department of Biology, University of California, San Diego, La Jolla

Abstract

A network model of disparity estimation was developed based on disparity-selective neurons, such as those found in the early stages of processing in the visual cortex. The model accurately estimated multiple disparities in regions, which may be caused by transparency or occlusion. The selective integration of reliable local estimates enabled the network to generate accurate disparity estimates on normal and transparent random-dot stereograms. The model was consistent with human psychophysical results on the effects of spatial-frequency filtering on disparity sensitivity. The responses of neurons in macaque area V2 to random-dot stereograms are consistent with the prediction of the model that a subset of neurons responsible for disparity selection should be sensitive to disparity gradients.

Type
Research Article
Copyright
1998 Cambridge University Press

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