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Space-variant visual processing: Spatially limited visual channels

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image of Spatial Vision
For more content, see Multisensory Research and Seeing and Perceiving.

A multichannel model incorporating visual inhomogeneity is presented in this paper. The parameters that describe inhomogeneity have been experimentally obtained both at threshold and in several suprathreshold conditions. At threshold, probability summation is taken into account in order to determine the spatial extent of visual channels from experimental data showing an asymptotic increase in sensitivity with increasing grating area. At suprathreshold contrast, the region where luminance variations at several scales are visible has also been found. The results support a spatially limited multichannel model of early visual processing and set out a basis for studying perceptual phenomena from the viewpoint of linear space-variant visual processing.

Affiliations: 1: Laboratorio de Visión, Facultad de Psicología. Universidad Complutense, Campus de Somosaguas, 28023 Madrid, Spain


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