Constrained Spectral Uplifting for HDR Environment Maps

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Constrained Spectral Uplifting for HDR Environment Maps

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Constrained Spectral Uplifting for HDR Environment Maps

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20100 - Civil engineering

Projekt

<a href="/cs/project/GA22-22875S" target="_blank" >GA22-22875S: Diferencovatelné vykreslování pro přesné modelování vzhledu ve výpočetní výrobě</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of Eurographics Symposium on Rendering 2024

ISBN

978-3-03868-262-2

ISSN

1727-3463

e-ISSN

—

Počet stran výsledku

11

Strana od-do

—

Název nakladatele

The Eurographics Association

Místo vydání

Neuveden

Místo konání akce

London, UK

Datum konání akce

3. 7. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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