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  Sky Based Light Metering for High Dynamic Range Images

Gryaditskaya, Y., Pouli, T., Reinhard, E., & Seidel, H.-P. (2014). Sky Based Light Metering for High Dynamic Range Images. Computer Graphics Forum, 33(7), 61-69. doi:10.1111/cgf.12474.

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Gryaditskaya, Yulia1, Autor           
Pouli, Tania1, Autor           
Reinhard, Erik1, Autor           
Seidel, Hans-Peter1, Autor           
Affiliations:
1Computer Graphics, MPI for Informatics, Max Planck Society, ou_40047              

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 Zusammenfassung: Image calibration requires both linearization of pixel values and scaling so that values in the image correspond to real-world luminances. In this paper we focus on the latter and rather than rely on camera characterization, we calibrate images by analysing their content and metadata, obviating the need for expensive measuring devices or modeling of lens and camera combinations. Our analysis correlates sky pixel values to luminances that would be expected based on geographical metadata. Combined with high dynamic range (HDR) imaging, which gives us linear pixel data, our algorithm allows us to find absolute luminance values for each pixel—effectively turning digital cameras into absolute light meters. To validate our algorithm we have collected and annotated a calibrated set of HDR images and compared our estimation with several other approaches, showing that our approach is able to more accurately recover absolute luminance. We discuss various applications and demonstrate the utility of our method in the context of calibrated color appearance reproduction and lighting design.

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Sprache(n): eng - English
 Datum: 20142014
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: DOI: 10.1111/cgf.12474
BibTex Citekey: CGF:Gryad:14
 Art des Abschluß: -

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Titel: Computer Graphics Forum
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Oxford, UK : Wiley-Blackwell
Seiten: - Band / Heft: 33 (7) Artikelnummer: - Start- / Endseite: 61 - 69 Identifikator: ISSN: 1467-8659

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Titel: 22nd Pacific Conference on Computer Graphics and Applications
  Kurztitel : Pacific Graphics 2014
  Andere : PG 2014
  Untertitel : 8 to 10 Oct 2014, Seoul, South Korea
Genre der Quelle: Konferenzband
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: - Artikelnummer: - Start- / Endseite: - Identifikator: -