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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 29 — Oct. 10, 2007
  • pp: 7308–7316

Light field constancy within natural scenes

Alexander A. Mury, Sylvia C. Pont, and Jan J. Koenderink  »View Author Affiliations


Applied Optics, Vol. 46, Issue 29, pp. 7308-7316 (2007)
http://dx.doi.org/10.1364/AO.46.007308


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Abstract

The structure of light fields of natural scenes is highly complex due to high frequencies in the radiance distribution function. However it is the low-order properties of light that determine the appearance of common matte materials. We describe the local light field in terms of spherical harmonics and analyze the qualitative properties and physical meaning of the low-order components. We take a first step in the further development of Gershun's classical work on the light field by extending his description beyond the 3D vector field, toward a more complete description of the illumination using tensors. We show that the three first components, namely, the monopole (density of light), the dipole (light vector), and the quadrupole (squash tensor) suffice to describe a wide range of qualitatively different light fields.In this paper we address a related issue, namely, the spatial properties of light fields within natural scenes. We want to find out to what extent local light fields change from point to point and how different orders behave. We found experimentally that the low-order components of the light field are rather constant over the scenes whereas high-order components are not. Using very simple models, we found a strong relationship between the low-order components and the geometrical layouts of the scenes.

© 2007 Optical Society of America

OCIS Codes
(120.5240) Instrumentation, measurement, and metrology : Photometry
(150.2950) Machine vision : Illumination

ToC Category:
Machine Vision

History
Original Manuscript: February 8, 2007
Manuscript Accepted: May 7, 2007
Published: October 9, 2007

Citation
Alexander A. Mury, Sylvia C. Pont, and Jan J. Koenderink, "Light field constancy within natural scenes," Appl. Opt. 46, 7308-7316 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-29-7308


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