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

Guarnera, G., Bianco, S., Schettini, R. (2019). Turning a Digital Camera into an Absolute 2D Tele-Colorimeter. COMPUTER GRAPHICS FORUM, 38(1), 73-86 [10.1111/cgf.13393].

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

Guarnera, GC;Bianco, S;Schettini, R
2019

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
Articolo in rivista - Articolo scientifico
Appearance modelling; Colour; Image and video processing; Image-based rendering; Modelling; Rendering; Computer Graphics and Computer-Aided Design
English
2019
38
1
73
86
reserved
Guarnera, G., Bianco, S., Schettini, R. (2019). Turning a Digital Camera into an Absolute 2D Tele-Colorimeter. COMPUTER GRAPHICS FORUM, 38(1), 73-86 [10.1111/cgf.13393].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/215385
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