Stereoscopic volume perception: effects of local scene arrangement across space and depth J M Harris |
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School of Psychology and Neuroscience, University of St. Andrews, United Kingdom
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| Complex three-dimensional scenes, with transparent surfaces or objects scattered through a volume, provide a compelling sensation of depth, yet can challenge models of binocular disparity extraction. Very few studies have explored the perception of volume from binocular disparity. Here we explored stereoscopic depth volume perception in scenes consisting of line elements located at a range of depths. Line elements could be scattered through a volume in depth, or presented on a pair of planes with a depth separation between them. The task was always volume discrimination: which of two volumes was the deeper in depth. We explored the effects of element density and local element layout. The perception of volume was sensitive to element density, with smaller depths being perceived for higher densities. High local disparity gradients resulted in reduced perceived volume, compared with scenes where local disparity gradients were low. The shape of the depth distribution within the volume also affected the depth of volume perceived. We explore the extent to which these perceptual effects can be explained by models of disparity extraction based on cross-correlation at a number of different spatial scales. |
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