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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 20, Iss. 1 — Jan. 1, 2003
  • pp: 24–31

The KGBR viewpoint–lighting ambiguity

Alan Yuille, James M. Coughlan, and Scott Konishi  »View Author Affiliations

JOSA A, Vol. 20, Issue 1, pp. 24-31 (2003)

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We address the visual ambiguities that arise in estimating object and scene structure from a set of images when the viewpoint and lighting are unknown. We obtain a novel viewpoint–lighting ambiguity called the KGBR that corresponds to a group of three-dimensional affine transformations on the object or scene geometry combined with transformations on the object or scene albedo. Our analysis assumes orthographic projection with an affine camera model. We include photometric cues, such as shadowing and shading, that we model using Lambertian reflectance functions with shadows (cast and attached) and multiple light sources (but no interreflections). We relate the KGBR to affine ambiguities in estimating shape and to the generalized bas-relief (GBR) ambiguity.

© 2003 Optical Society of America

OCIS Codes
(100.0100) Image processing : Image processing
(150.0150) Machine vision : Machine vision

Original Manuscript: April 8, 2002
Revised Manuscript: July 23, 2002
Manuscript Accepted: July 26, 2002
Published: January 1, 2003

Alan Yuille, James M. Coughlan, and Scott Konishi, "The KGBR viewpoint–lighting ambiguity," J. Opt. Soc. Am. A 20, 24-31 (2003)

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