NDLI: Shape from shading for multiple albedo images

Content Provider	IEEE Xplore Digital Library
Author	Ortiz, A. Oliver, G.
Copyright Year	2000
Description	Author affiliation: Dept. of Math. & Comput. Sci., Univ. of the Balearic Islands, Spain (Ortiz, A.)
Abstract	Most shape from shading (SFS) algorithms assume that objects in the scene are Lambertian reflectors, i.e., they do not absorb any radiation for any wavelength. However, real objects reflect only part of the incoming radiation, so that these algorithms usually perform poorly on images with non-uniform reflectivity. In this paper an adaptation for such algorithms is proposed. The strategy mainly consists of guiding the SFS algorithm through the image in order not to violate the typical albedo uniformity assumption. To do this, the pixels in the image are iteratively grouped into regions coming from the same scene until there are no more adjacent pixels satisfying this condition. The decision about the aggregation of a new pixel to a region is based on estimating its albedo and comparing it with the albedo of the region. During this process, SFS is applied only to the considered region and its results are used in the albedo estimation procedure. Some experimental results with synthetic and real images are discussed.
Starting Page	786
Ending Page	789
File Size	451092
Page Count	4
File Format	PDF
ISBN	0769507506
ISSN	10514651
DOI	10.1109/ICPR.2000.905510
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2000-09-03
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Shape Pixel Layout Equations Surface fitting Light sources Mathematics Computer science Reflectivity Iterative algorithms
Content Type	Text
Resource Type	Article
Subject	Computer Vision and Pattern Recognition

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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