Guarnera, G. C., Bianco, S. and Schettini, R. (2018) Turning a Digital Camera into an Absolute 2D Tele-Colorimeter. Computer graphics forum. pp. 73-86. ISSN 0167-7055
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/m 2 ) 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.
Metadata
Authors/Creators: |
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Keywords: | appearance modelling, colour, 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, modelling, rendering |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Computer Science (York) |
Depositing User: | Pure (York) |
Date Deposited: | 19 Nov 2019 09:00 |
Last Modified: | 06 Dec 2023 13:25 |
Published Version: | https://doi.org/10.1111/cgf.13393 |
Status: | Published online |
Refereed: | Yes |
Identification Number: | https://doi.org/10.1111/cgf.13393 |
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