Illuminant Estimation by Voting

  • Obtaining an estimate of the illuminant color is an important component in many image analysis applications. Due to the complexity of the problem many estrictive assumptions are commonly applied, making the existing illuminant estimation methodologies not widely applicable on natural images. We propose a methodology which analyzes a large number of regions in an image. An illuminant estimate is obtained independently from each region and a global illumination color is computed by consensus. Each region itself is mainly composed by pixels which simultaneously exhibit both diffuse and specular reflection. This allows for a larger inclusion of pixels than purely specularity-based methods, whileObtaining an estimate of the illuminant color is an important component in many image analysis applications. Due to the complexity of the problem many estrictive assumptions are commonly applied, making the existing illuminant estimation methodologies not widely applicable on natural images. We propose a methodology which analyzes a large number of regions in an image. An illuminant estimate is obtained independently from each region and a global illumination color is computed by consensus. Each region itself is mainly composed by pixels which simultaneously exhibit both diffuse and specular reflection. This allows for a larger inclusion of pixels than purely specularity-based methods, while avoiding, at the same time, some of the restrictive assumptions of purely diffuse-based approaches. As such, our technique is particularly well-suited for analyzing real-world images. On natural images, the algorithm is very stable and provides qualitatively correct estimates.show moreshow less

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Metadaten
Author:Christian Riess, Eva Eibenberger, Elli Angelopoulou
URN:urn:nbn:de:bvb:29-opus-13917
Document Type:Working Paper
Language:English
Date of Publication (online):2009/07/27
Publishing Institution:Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU)
Release Date:2009/07/27
Tag:Beleuchtungsschätzung; Glanzlicht; physik-basiert
color; estiimation; illumination; natural images; physics-based
SWD-Keyword:Globale Beleuchtung; color
Institutes:Technische Fakultät / Technische Fakultät -ohne weitere Spezifikation-
Dewey Decimal Classification:0 Informatik, Informationswissenschaft, allgemeine Werke / 00 Informatik, Wissen, Systeme / 004 Datenverarbeitung; Informatik

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