Turning a Digital Camera into an Absolute 2D Tele‐Colorimeter

We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for r...

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Vydáno v:	Computer graphics forum Ročník 38; číslo 1; s. 73 - 86
Hlavní autoři:	Guarnera, G. C., Bianco, S., Schettini, R.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford Blackwell Publishing Ltd 01.02.2019
Témata:	Apertures appearance modelling Chromaticity Colorimetry colour Computer graphics Digital cameras Electric power distribution Explicit knowledge I.3.3 [Computer Graphics]: Picture/Image Generation—I.4.1 [Image Processing and Computer Vision]: Digitization and Image Capture—I.4.8 [Image Processing and Computer Vision]: Scene Analysis image and video processing image‐based rendering Irradiance Light sources Luminance distribution modelling Power spectra Radiance Reflectance rendering
ISSN:	0167-7055, 1467-8659
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Abstract	We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We validate the approach by comparing our estimated absolute tristimulus values (XYZ data in cd/m2) with the measurements of a professional 2D tele‐colorimeter, for a set of scenes with complex geometry, spatially varying reflectance and light sources with very different spectral power distribution. We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra.
AbstractList	We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We validate the approach by comparing our estimated absolute tristimulus values (XYZ data in cd/m2) with the measurements of a professional 2D tele‐colorimeter, for a set of scenes with complex geometry, spatially varying reflectance and light sources with very different spectral power distribution. We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We validate the approach by comparing our estimated absolute tristimulus values (XYZ data in cd/m2) with the measurements of a professional 2D tele‐colorimeter, for a set of scenes with complex geometry, spatially varying reflectance and light sources with very different spectral power distribution. We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance, suitable in a wide range of applications including image‐based reflectance measurements, spectral pre‐filtering and spectral upsampling for rendering, to improve colour accuracy in high dynamic range imaging. Our method requires a limited number of acquisitions, an off‐the‐shelf target and a commonly available projector, used as a controllable light source, other than the reflected radiance to be known. The characterized camera can be effectively used as a 2D tele‐colorimeter, providing the user with an accurate estimate of the distribution of luminance and chromaticity in a scene, without requiring explicit knowledge of the incident lighting power spectra. We validate the approach by comparing our estimated absolute tristimulus values (XYZ data in ) with the measurements of a professional 2D tele‐colorimeter, for a set of scenes with complex geometry, spatially varying reflectance and light sources with very different spectral power distribution.
Author	Schettini, R. Guarnera, G. C. Bianco, S.
Author_xml	– sequence: 1 givenname: G. C. surname: Guarnera fullname: Guarnera, G. C. email: giuseppe.guarnera@ntnu.no organization: NTNU ‐ Norwegian University of Science and Technology – sequence: 2 givenname: S. surname: Bianco fullname: Bianco, S. email: simone.bianco@disco.unimib.it organization: University of Milano‐Bicocca – sequence: 3 givenname: R. surname: Schettini fullname: Schettini, R. email: schettini@disco.unimib.it organization: University of Milano‐Bicocca
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Cites_doi	10.1109/CVPR.2008.4587782 10.2352/J.ImagingSci.Technol.2002.46.1.art00004 10.1145/300776.300778 10.1145/15886.15902 10.1109/CVPR.1999.786966 10.1145/344779.344855 10.1109/TCE.2007.4341581 10.1007/978-3-642-33868-7_34 10.1111/cgf.12867 10.1111/j.1467-8659.2009.01493.x 10.1111/j.1467-8659.2008.01167.x 10.1364/JOSAA.29.000374 10.1007/978-3-7091-6809-7_13 10.1364/JOSA.57.001105 10.1117/1.JEI.22.2.023014 10.1007/s10851-014-0496-1 10.1137/S1052623497331373 10.1111/cgf.12719 10.1109/TVCG.2017.2657178 10.6028/jres.080A.021 10.1145/882262.882341 10.1109/CVPR.2000.855857 10.1117/12.474876 10.6028/NBS.MONO.160 10.1145/258734.258884 10.1145/280814.280864 10.1117/12.278080 10.1109/WACV.2013.6475015 10.1364/JOSAA.27.001868 10.1109/ICIP.2009.5413828 10.1145/383259.383320 10.1109/42.796284 10.1111/cgf.12676 10.1111/j.1467-8659.2008.01150.x
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Copyright	2018 The Authors Computer Graphics Forum © 2018 The Eurographics Association and John Wiley & Sons Ltd. 2019 The Eurographics Association and John Wiley & Sons Ltd.
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Snippet	We present a simple and effective technique for absolute colorimetric camera characterization, invariant to changes in exposure/aperture and scene irradiance,...
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SubjectTerms	Apertures appearance modelling Chromaticity Colorimetry colour Computer graphics Digital cameras Electric power distribution Explicit knowledge I.3.3 [Computer Graphics]: Picture/Image Generation—I.4.1 [Image Processing and Computer Vision]: Digitization and Image Capture—I.4.8 [Image Processing and Computer Vision]: Scene Analysis image and video processing image‐based rendering Irradiance Light sources Luminance distribution modelling Power spectra Radiance Reflectance rendering
Title	Turning a Digital Camera into an Absolute 2D Tele‐Colorimeter
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