Robust approach to inverse lighting using RGB-D images

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Proper lighting is a key element in developing a photorealistic computer-generated image. This paper introduces a novel approach for robustly extracting lighting conditions from an RGB-D (RGB + depth) image. Existing studies on lighting estimation have developed image analysis techniques by constraining the scope and condition of the target objects. For example, they have assumed that the objects have homogeneous surfaces, inter-reflections can be ignored, and their three-dimensional (3D) geometries consist of a noise-free mesh. These assumptions, however, are unrealistic; real objects often have complicated non-homogeneous surfaces, inter-reflections that affect a considerable portion of illumination, or unpredictable noise that can affect sensor measurements. To overcome these limitations, this study takes non-homogeneous surface objects into account in the inverse lighting framework via segment-based scene representation. Moreover, we employ outlier removal and appropriate region selection to achieve robust lighting estimation in the presence of inter-reflections and noise. We demonstrate the effectiveness of the proposed approach by conducting extensive experiments on synthetic and real RGB-D images. (C) 2018 Elsevier Inc. All rights reserved.
Publisher
ELSEVIER SCIENCE INC
Issue Date
2018-04
Language
English
Article Type
Article
Citation

INFORMATION SCIENCES, v.438, pp.73 - 94

ISSN
0020-0255
DOI
10.1016/j.ins.2018.01.049
URI
http://hdl.handle.net/10203/297175
Appears in Collection
AI-Journal Papers(저널논문)
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