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Proceedings Paper

The role of natural lighting diffuseness in human visual perception
Author(s): Yaniv Morgenstern; Wilson S. Geisler; Richard F. Murray
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Paper Abstract

The pattern of the light that falls on the retina is a conflation of real-world sources such as illumination and reflectance. Human observers often contend with the inherent ambiguity of the underlying sources by making assumptions about what real-world sources are most likely. Here we examine whether the visual system’s assumptions about illumination match the statistical regularities of the real world. We used a custom-built multidirectional photometer to capture lighting relevant to the shading of Lambertian surfaces in hundreds of real-world scenes. We quantify the diffuseness of these lighting measurements, and compare them to previous biases in human visual perception. We find that (1) natural lighting diffuseness falls over the same range as previous psychophysical estimates of the visual system’s assumptions on diffuseness, and (2) natural lighting almost always provides lighting direction cues that are strong enough to override the human visual system’s well known assumption that light tends to come from above. A consequence of these findings is that what seem to be errors in visual perception are often actually byproducts of the visual system knowing about and using reliable properties of real-world lighting when contending with ambiguous retinal images.

Paper Details

Date Published: 17 March 2015
PDF: 11 pages
Proc. SPIE 9394, Human Vision and Electronic Imaging XX, 93940P (17 March 2015); doi: 10.1117/12.2086258
Show Author Affiliations
Yaniv Morgenstern, Univ. of Minnesota, Twin Cities (United States)
Wilson S. Geisler, The Univ. of Texas at Austin (United States)
Richard F. Murray, York Univ. (Canada)

Published in SPIE Proceedings Vol. 9394:
Human Vision and Electronic Imaging XX
Bernice E. Rogowitz; Thrasyvoulos N. Pappas; Huib de Ridder, Editor(s)

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