Real-World Normal Map Capture for Nearly Flat Reflective Surfaces.

Jacquet, B., Häne, C., Köser, Kevin and Pollefeys, M. (2013) Real-World Normal Map Capture for Nearly Flat Reflective Surfaces. In: Proceedings of the Internatioanl Conference on Computer Vision 2013 (ICCV 2013). . ICCV, Sydney, Australia, pp. 465-472. DOI 10.1109/ICCV.2013.94.

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Although specular objects have gained interest in recent
years, virtually no approaches exist for markerless reconstruction
of reflective scenes in the wild. In this work, we
present a practical approach to capturing normal maps in
real-world scenes using video only. We focus on nearly planar
surfaces such as windows, facades from glass or metal,
or frames, screens and other indoor objects and show how
normal maps of these can be obtained without the use of an
artificial calibration object. Rather, we track the reflections
of real-world straight lines, while moving with a hand-held
or vehicle-mounted camera in front of the object. In contrast
to error-prone local edge tracking, we obtain the reflections
by a robust, global segmentation technique of an
ortho-rectified 3D video cube that also naturally allows efficient
user interaction. Then, at each point of the reflective
surface, the resulting 2D-curve to 3D-line correspondence
provides a novel quadratic constraint on the local surface
normal. This allows to globally solve for the shape by integrability
and smoothness constraints and easily supports
the usage of multiple lines. We demonstrate the technique
on several objects and facades.

Document Type: Book chapter
Additional Information: Poster
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Open Access Journal?: Yes
DOI etc.: 10.1109/ICCV.2013.94
Date Deposited: 14 Jan 2014 08:34
Last Modified: 15 Jan 2014 09:33

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