NDLI: Matching Photometric Observation Vectors with Shadows and Variable Albedo

Content Provider	IEEE Xplore Digital Library
Author	Leitao, H.C.G. Saracchini, R.F.V. Stolfi, J.
Copyright Year	2008
Description	Author affiliation: Inst, of Comput., State Univ. of Campinas, Campinas (Saracchini, R.F.V.; Stolfi, J.) \|\| Inst, of Comput., Fluminense Fed. Univ., Niteroi (Leitao, H.C.G.)
Abstract	We describe a procedure to solve the basic problem of variable lighting photometric stereo - namely, recovering the normal directions and intrinsic albedos at all visible points of an opaque object, by analyzing three or more photos of the same taken with different illuminations. We follow the gauge-based approach, where the lighting conditions and light scattering properties of the surface are given indirectly by photographing a gauge object with known shape and albedo, under the same lighting conditions. Unlike previous solutions, our method yields reliable results even when some of the images contain cast shadows, penumbras, highlights, or inter-object lighting, at a cost. The cost of inner loop grows quadratically, (rather than exponentially) with the number m of input images. Usable approximations can be obtained in m log m time.
Starting Page	179
Ending Page	186
File Size	405834
Page Count	8
File Format	PDF
ISBN	9780769533582
ISSN	15301834
DOI	10.1109/SIBGRAPI.2008.39
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-12
Publisher Place	Brazil
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lighting Pixel Light sources Surface finishing Image color analysis Equations Face computer vision Photometric stereo
Content Type	Text
Resource Type	Article

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