Abstract
There are three reasons for illumination to vary within a scene. First, a light source may be visible from some surfaces but not from others. Second, because of linear perspective, the shape and size of a finite source may be different when viewed from different points in a scene. Third, the brightness of a source may be non-uniform. These variations are captured by a new computational model of spatially varying illumination. Two types of source are described: a distant hemispheric source such as the sky in which light converges onto a scene, and a proximal source such as a lamp in which light diverges into a scene. Either type of source may have a non-uniform brightness function. We show how to render surfaces using this model, and how to compute shape from shading under it.
This research was supported by grants from NSERC and AFOSR.
Chapter PDF
Keywords
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
References
M. S. Langer, S.W. Zucker, “Diffuse Shading, Visibility Fields, and the Geometry of Ambient Light”, Proc. Fourth ICCV, Berlin, Germany. May 1993.
M. S. Langer, S.W. Zucker, “Shape from Shading on a Cloudy Day”. J. Opt. Soc. Am. (in press).
A. Gershun, “The Light Field”, J.Math.Phys. 18, 51–151 (1939).
Cohen, M.F., Greenberg, D.P. “The hemicube: A radiosity approach for complex enviroments.” Computer Graphics 22(4) 155–164 (1985).
P. Moon, The Scientific Basis of Illuminating Engineering. (Dover Publications, 1961).
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1994 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Langer, M.S., Zucker, S.W. (1994). Spatially varying illumination: A computational model of converging and diverging sources. In: Eklundh, JO. (eds) Computer Vision — ECCV '94. ECCV 1994. Lecture Notes in Computer Science, vol 801. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0028356
Download citation
DOI: https://doi.org/10.1007/BFb0028356
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-57957-1
Online ISBN: 978-3-540-48400-4
eBook Packages: Springer Book Archive