Constrained Spectral Uplifting for HDR Environment Maps

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F24%3A10485122" target="_blank" >RIV/00216208:11320/24:10485122 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.2312/sr.20241153" target="_blank" >https://doi.org/10.2312/sr.20241153</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.2312/sr.20241153" target="_blank" >10.2312/sr.20241153</a>

Result language
angličtina
Original language name
Constrained Spectral Uplifting for HDR Environment Maps
Original language description
Spectral representation of assets is an important precondition for achieving physical realism in rendering. However, defining assets by their spectral distribution is complicated and tedious. Therefore, it has become general practice to create RGB assets and convert them into their spectral counterparts prior to rendering. This process is called spectral uplifting. While a multitude of techniques focusing on reflectance uplifting exist, the current state of the art of uplifting emission for image-based lighting consists of simply scaling reflectance uplifts. Although this is usable insofar as the obtained overall scene appearance is not unrealistic, the generated emission spectra are only metamers of the original illumination. This, in turn, can cause deviations from the expected appearance even if the rest of the scene corresponds to real world data. We propose a method capable of uplifting HDR environment maps based on spectral measurements of light sources similar to those present in the maps. To identify the illuminants, we employ an extensive set of emission measurements, and we combine the results with an existing reflectance uplifting method. In addition, we address the problem of environment map capture for the purposes of a spectral rendering pipeline, for which we propose a novel solution.
Czech name
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Czech description
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Project
<a href="/en/project/GA22-22875S" target="_blank" >GA22-22875S: Differentiable rendering for accurate appearance modelling in computational fabrication</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proceedings of Eurographics Symposium on Rendering 2024
ISBN
978-3-03868-262-2
ISSN
1727-3463
e-ISSN
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Number of pages
11
Pages from-to
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Publisher name
The Eurographics Association
Place of publication
Neuveden
Event location
London, UK
Event date
Jul 3, 2024
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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