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Pooling of vertical disparities by the human visual system

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), pp. 165-176.

Record type: Article


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.

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Published date: 1996


Local EPrints ID: 18646
PURE UUID: ebdc32f0-9e65-4e13-9a40-0ae009448f50
ORCID for Wendy Adams: ORCID iD

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Date deposited: 29 Nov 2005
Last modified: 17 Jul 2017 16:35

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

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