“DIY Absolute Tele-Colorimeter using a Camera-Projector System”

  • ©Giuseppe Claudio Guarnera, Simone Bianco, and Raimondo Schettini

  • ©Giuseppe Claudio Guarnera, Simone Bianco, and Raimondo Schettini

  • ©Giuseppe Claudio Guarnera, Simone Bianco, and Raimondo Schettini

  • ©Giuseppe Claudio Guarnera, Simone Bianco, and Raimondo Schettini

  • ©Giuseppe Claudio Guarnera, Simone Bianco, and Raimondo Schettini

  • ©Giuseppe Claudio Guarnera, Simone Bianco, and Raimondo Schettini

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Entry Number: 23

Title:

    DIY Absolute Tele-Colorimeter using a Camera-Projector System

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Abstract:


    Image-based reflectance measurement setups lower costs and increase the speed of reflectance acquisition. Unfortunately, consumer camera sensors are designed to produce aesthetically pleasing images, rather than faithfully capture the colors of a scene. We present a novel approach for colorimetric camera characterization, which exploits a commonly available projector as controllable light source, and accurately relates the camera sensor response to the known reflected radiance. The characterized camera can be effectively used as a 2D tele-colorimeter, suitable for image-based reflectance measurements, spectral prefiltering and spectral up-sampling for rendering, and to improve color accuracy in HDR imaging. We demonstrate our method in the context of radiometric compensation. Coupled with a gamut-mapping technique, it allows to seamlessly project images on almost any surface, including non-flat, colored or even textured ones.

References:


    S. Bianco, F. Gasparini, A. Russo, and R. Schettini. 2007. A new method for RGB to XYZ transformation based on pattern search optimization. IEEE Transactions on Consumer Electronics 53, 3 (2007), 1020–1028.
    D. Guarnera, G.C. Guarnera, A. Ghosh, C. Denk, and M. Glencross. 2016. BRDF Representation and Acquisition. Computer Graphics Forum 35, 2 (2016), 625–650.
    G. C. Guarnera, S. Bianco, and R. Schettini. 2018. Turning a Digital Camera into an Absolute 2D Tele-Colorimeter. Computer Graphics Forum (2018).
    M. H. Kim and J. Kautz. 2008. Characterization for High Dynamic Range Imaging. Computer Graphics Forum 27, 2 (2008), 691–697.
    F. Martínez-Verdú, J. Pujol, and P. Capilla. 2003. Characterization of a digital camera as an absolute tristimulus colorimeter. Journal of Imaging Science and Technology 47, 4 (2003), 279–295.
    F. Naccari, M. Guarnera, S. Bianco, and R. Schettini. 2016. Method for radiometric compensated display, corresponding system, apparatus and computer program product. (June 30 2016). US Patent App. 14/870,131.

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