Quéau, Yvain and Mecca, Roberto and Durou, Jean-Denis
and Descombes, Xavier
Photometric Stereo with Only Two Images: A Theoretical Study and Numerical Resolution.
(2017)
Image and Vision Computing, 57. 175-191. ISSN 0262-8856
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(Document in English)
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Official URL: https://doi.org/10.1016/j.imavis.2016.11.006
Abstract
This work tackles the problem of two-image photometric stereo. This problem constitutes the intermediate case between conventional photometric stereo with at least three images, which is well-posed, and shape-from-shading, which is ill-posed. We first provide a theoretical study of ambiguities arising in this intermediate case. Based on this study, we show that when the albedo is known, disambiguation can be formulated as a binary labeling problem, using integrability and a nonstationary Ising model. The resulting optimization problem is solved efficiently by resorting to the graph cut algorithm. These theoretical and numerical contributions are eventually validated in an application to three-image photometric stereo with shadows.
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