The perceived image: efficient modelling of visual inhomogeneity.
When we fixate on a certain location in a scene, the image that our visual system provides us with is not like a snapshot of the scene. Because of visual inhomogeneity, the image we perceive is sharp and clean only around the fixation location, and it gradually blurs and loses detail with increasing distance from that location. In this paper, a procedure is presented that allows one to obtain the luminance distribution in the perceived image of a scene. The procedure is based on a stack distribution model of spatial visual processing, with parameters obtained experimentally. An application of this procedure is presented which allows an explanation of data on the decrease of visual acuity with eccentricity. The advantages of this procedure for taking visual inhomogeneity into account when seeking explanations for perceptual phenomena are also discussed.
García-Pérez
M A
MA
Laboratorio de Visión, Facultad de Psicologia, Universidad Complutense, Madrid, Spain.
D005403:Fixation, Ocular; D006801:Humans; D008027:Light; D008433:Mathematics; D008954:Models, Biological; D013028:Space Perception; D014796:Visual Perception