Please use this identifier to cite or link to this item: https://doi.org/10.1007/978-3-642-33712-3_33
Title: Elevation angle from reflectance monotonicity: Photometric stereo for general isotropic reflectances
Authors: Shi, B.
Tan, P. 
Matsushita, Y.
Ikeuchi, K.
Issue Date: 2012
Source: Shi, B.,Tan, P.,Matsushita, Y.,Ikeuchi, K. (2012). Elevation angle from reflectance monotonicity: Photometric stereo for general isotropic reflectances. Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 7574 LNCS (PART 3) : 455-468. ScholarBank@NUS Repository. https://doi.org/10.1007/978-3-642-33712-3_33
Abstract: This paper exploits the monotonicity of general isotropic reflectances for estimating elevation angles of surface normal given the azimuth angles. With an assumption that the reflectance includes at least one lobe that is a monotonic function of the angle between the surface normal and half-vector (bisector of lighting and viewing directions), we prove that elevation angles can be uniquely determined when the surface is observed under varying directional lights densely and uniformly distributed over the hemisphere. We evaluate our method by experiments using synthetic and real data to show its wide applicability, even when the assumption does not strictly hold. By combining an existing method for azimuth angle estimation, our method derives complete surface normal estimates for general isotropic reflectances. © 2012 Springer-Verlag.
Source Title: Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
URI: http://scholarbank.nus.edu.sg/handle/10635/70154
ISBN: 9783642337116
ISSN: 03029743
DOI: 10.1007/978-3-642-33712-3_33
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