Computational model of neuronal system for local and global stereo vision D Matuzevicius, H Vaitkevicius |
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Department of General Psychology, Vilnius University, Lithuania
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| Current widely accepted models of stereo vision address the coding of either disparity or visual direction; moreover, no biologically plausible models combine processing of both. These properties of stereo vision are still not computationally explained: diplopia, allelotropia, stereoacuity phenomena, impact of differences in monocular contrast on the perception of object location in 3-D space. We propose a computational model of neuronal system for the determination of both stereo depth and visual direction. Introduced binocular analyzer consists of a set of local analyzers (LAs) that map information to a global system. Each LA provides encoded disparity and direction of light centroid presented in a small part of visual field. LAs combine signals from the four types of Gabor-like monocular neurons that have corresponding receptive fields. Here global system constructs representation of the entire binocular visual field. Proposed model embodies all properties of the energy model, and is supported by our and other authors’ experimental data. Model explains: exponential decrease of stereoacuity while object is moving away from horopter, influence of interocular contrast's differences on perceived direction and depth, phenomena of the allelotropia and diplopia. [Postdoctoral fellowship is being funded by European Union Structural Funds project “Postdoctoral Fellowship Implementation in Lithuania”] |
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