Reflections on shading
Forsyth, D.
Zisserman, A.
Dept. of Eng. Sci., Oxford Univ.;
This paper appears in: Pattern Analysis and Machine Intelligence, IEEE Transactions on
Publication Date: Jul 1991
Volume: 13,
Issue: 7
On page(s): 671-679
ISSN: 0162-8828
References Cited: 35
CODEN: ITPIDJ
INSPEC Accession Number: 4026733
Digital Object Identifier: 10.1109/34.85657
Current Version Published: 2002-08-06
Abstract
It is demonstrated that mutual illumination can produce
significant effects in real scenes. An example is presented to
illustrate the difficulties that mutual illumination presents to shape
recovery schemes. These effects are qualitatively modeled by the
radiosity equation. Using the radiosity equation, the authors predict
the occurrence of spectral events in the radiance, namely,
discontinuities in the radiance and its derivatives. Experimental
evidence establishes the validity of this approach. Mutual illumination
can generate discontinuities in the derivatives of radiance unrelated to
local geometry. It is argued that it is not possible to obtain veridical
dense depth or normal maps from a shading analysis. However,
discontinuities in radiance are tractably related to scene geometry and,
moreover, can be detected
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