Perceiving Geometry

Perceiving Geometry

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During the last few centuries, natural philosophers, and more recently vision scientists, have recognized that a fundamental problem in biological vision is that the sources underlying visual stimuli are unknowable in any direct sense, because of the inherent ambiguity of the stimuli that impinge on sensory receptors. The light that reaches the eye from any scene conflates the contributions of reflectance, illumination, transmittance, and subsidiary factors that affect these primary physical parameters. Spatial properties such as the size, distance and orientation of physical objects are also conflated in light stimuli. As a result, the provenance of light reaching the eye at any moment is uncertain. This quandary is referred to as the inverse optics problem. This book considers the evidence that the human visual system solves this problem by incorporating past human experience of what retinal images have typically corresponded to in the real world.Geometrical Illusions Explained by Natural Scene Statistics Catherine Q. Howe, Dale Purves ... The cumulative probability corresponding to 30a—b, however, is 0.185 (a‰ˆ33/180), which is larger than 30/180. ... producing an overall effect in which the vertical test lines appear to be more markedly tilted away from the contextualanbsp;...

Title:Perceiving Geometry
Author:Catherine Q. Howe, Dale Purves
Publisher:Springer Science & Business Media - 2005-12-06


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