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

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dc.contributor.authorGuarnera, G. C.en_US
dc.contributor.authorBianco, S.en_US
dc.contributor.authorSchettini, R.en_US
dc.contributor.editorChen, Min and Benes, Bedrichen_US
dc.date.accessioned2019-03-17T09:56:48Z
dc.date.available2019-03-17T09:56:48Z
dc.date.issued2019
dc.description.abstractWe 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.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.en_US
dc.description.number1
dc.description.sectionheadersArticles
dc.description.seriesinformationComputer Graphics Forum
dc.description.volume38
dc.identifier.doi10.1111/cgf.13393
dc.identifier.issn1467-8659
dc.identifier.pages73-86
dc.identifier.urihttps://doi.org/10.1111/cgf.13393
dc.identifier.urihttps://diglib.eg.org:443/handle/10.1111/cgf13393
dc.publisher© 2019 The Eurographics Association and John Wiley & Sons Ltd.en_US
dc.subjectcolour
dc.subjectimage and video processing
dc.subjectappearance modelling
dc.subjectmodelling
dc.subjectimage‐based rendering
dc.subjectrendering
dc.subjectI.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
dc.titleTurning a Digital Camera into an Absolute 2D Tele‐Colorimeteren_US
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