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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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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-6C64-1 Version Permalink: https://hdl.handle.net/21.11116/0000-000E-2EFB-5
Genre: Journal Article

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

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 Abstract: 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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Language(s): eng - English
 Dates: 20142014
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1111/cgf.12474
BibTex Citekey: CGF:Gryad:14
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Title: Computer Graphics Forum
Source Genre: Journal
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Publ. Info: Oxford, UK : Wiley-Blackwell
Pages: - Volume / Issue: 33 (7) Sequence Number: - Start / End Page: 61 - 69 Identifier: ISSN: 1467-8659

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Title: 22nd Pacific Conference on Computer Graphics and Applications
  Abbreviation : Pacific Graphics 2014
  Other : PG 2014
  Subtitle : 8 to 10 Oct 2014, Seoul, South Korea
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -