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3-D Reconstruction of Shaded Objects from Multiple Images Under Unknown Illumination
Abstract : We propose a variational algorithm to jointly estimate the shape, albedo, and light configuration of a Lambertian scene from a collection of images taken from different vantage points. Our work can be thought of as extending classical multi-view stereo to cases where point correspondence cannot be established, or extending classical shape from shading to the case of multiple views with unknown light sources. We show that a first naive formalization of this problem yields algorithms that are numerically unstable, no matter how close the initialization is to the true geometry. We then propose a computational scheme to overcome this problem, resulting in provably stable algorithms that converge to (local) minima of the cost functional. We develop a new model that explicitly enforces positivity in the light sources with the assumption that the object is Lambertian and its albedo is piecewise constant and show that the new model significantly improves the accuracy and robustness relative to existing approaches.
Cited literature [40 references]
https://hal.inria.fr/inria-00260433
Contributor : Emmanuel Prados Connect in order to contact the contributor
Submitted on : Tuesday, March 4, 2008 - 11:08:32 AM
Last modification on : Thursday, February 3, 2022 - 3:09:45 AM
Long-term archiving on: : Friday, September 28, 2012 - 10:35:35 AM
Contributor : Emmanuel Prados Connect in order to contact the contributor
Submitted on : Tuesday, March 4, 2008 - 11:08:32 AM
Last modification on : Thursday, February 3, 2022 - 3:09:45 AM
Long-term archiving on: : Friday, September 28, 2012 - 10:35:35 AM
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