The University of Southampton
University of Southampton Institutional Repository

Pooling of vertical disparities by the human visual system

Pooling of vertical disparities by the human visual system
Pooling of vertical disparities by the human visual system
Two experiments are described in which the effects of scaling vertical disparities on the perceived amplitudes of dome-shaped surfaces depicted with horizontal disparities were examined. The Mayhew and Longuet-Higgins's theory and the regional-disparity-correction theory of Garding et al predict that scaling should generate a change in perceived depth appropriate to the viewing distance simulated by the scaled vertical disparities. Significant depth changes were observed, by means of a nulling task in which the vertical-disparity-scaling effect was cancelled by the observer choosing a pattern of horizontal disparities that made the dome-shaped surface appear flat. The sizes of the scaling effects were less than those predicted by either theory, suggesting that other cues to fixation distance such as oculomotor information played an appreciable role. In conditions in which 50% of the texture elements were given one value of vertical-disparity scaling and the remaining 50% were left unscaled, the size of the scaling effect on perceived depth could be accounted for by equally weighted pooling of the vertical-disparity information unless the two scalings were very dissimilar, in which case the lower scaling factor tended to dominate. These findings are discussed in terms of a Hough parameter estimation model of the vertical-disparity-pooling process.
165-176
Adams, Wendy
25685aaa-fc54-4d25-8d65-f35f4c5ab688
Frisby, John P.
de8ffbb0-8d8e-4216-9f45-4d258e113946
Buckley, David
9c732a4b-a8cc-4352-afa2-7e951ec6fc3e
Gårding, Jonas
2aa67ab9-7a0f-477c-a145-a93f50f70e00
Hippisley-Cox, Stephen D.
c4eb47cd-d6c7-4a75-90cf-83ca13781e21
Porrill, John
095ced9b-05c6-4211-a26d-59fac74791bb
Adams, Wendy
25685aaa-fc54-4d25-8d65-f35f4c5ab688
Frisby, John P.
de8ffbb0-8d8e-4216-9f45-4d258e113946
Buckley, David
9c732a4b-a8cc-4352-afa2-7e951ec6fc3e
Gårding, Jonas
2aa67ab9-7a0f-477c-a145-a93f50f70e00
Hippisley-Cox, Stephen D.
c4eb47cd-d6c7-4a75-90cf-83ca13781e21
Porrill, John
095ced9b-05c6-4211-a26d-59fac74791bb

Adams, Wendy, Frisby, John P., Buckley, David, Gårding, Jonas, Hippisley-Cox, Stephen D. and Porrill, John (1996) Pooling of vertical disparities by the human visual system. Perception, 25 (2), 165-176.

Record type: Article

Abstract

Two experiments are described in which the effects of scaling vertical disparities on the perceived amplitudes of dome-shaped surfaces depicted with horizontal disparities were examined. The Mayhew and Longuet-Higgins's theory and the regional-disparity-correction theory of Garding et al predict that scaling should generate a change in perceived depth appropriate to the viewing distance simulated by the scaled vertical disparities. Significant depth changes were observed, by means of a nulling task in which the vertical-disparity-scaling effect was cancelled by the observer choosing a pattern of horizontal disparities that made the dome-shaped surface appear flat. The sizes of the scaling effects were less than those predicted by either theory, suggesting that other cues to fixation distance such as oculomotor information played an appreciable role. In conditions in which 50% of the texture elements were given one value of vertical-disparity scaling and the remaining 50% were left unscaled, the size of the scaling effect on perceived depth could be accounted for by equally weighted pooling of the vertical-disparity information unless the two scalings were very dissimilar, in which case the lower scaling factor tended to dominate. These findings are discussed in terms of a Hough parameter estimation model of the vertical-disparity-pooling process.

This record has no associated files available for download.

More information

Published date: 1996

Identifiers

Local EPrints ID: 18646
URI: http://eprints.soton.ac.uk/id/eprint/18646
PURE UUID: ebdc32f0-9e65-4e13-9a40-0ae009448f50
ORCID for Wendy Adams: ORCID iD orcid.org/0000-0002-5832-1056

Catalogue record

Date deposited: 29 Nov 2005
Last modified: 09 Jan 2022 03:16

Export record

Contributors

Author: Wendy Adams ORCID iD
Author: John P. Frisby
Author: David Buckley
Author: Jonas Gårding
Author: Stephen D. Hippisley-Cox
Author: John Porrill

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×