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Volume: 3 | Article ID: art00072
Spectral characterization of a hyperspectral system for imaging of large art paintings
  DOI :  10.2352/CGIV.2006.3.1.art00072  Published OnlineJanuary 2006

Spectral imaging of art paintings has been carried out using multi and hyperspectral systems with spectral filters mounted in front of the imaging device. This type of configuration exposes the painting to light not used by the imaging device and it is not suitable for large paintings when high resolution is required. The purpose of this work was the development and the spectral characterization of a hyperspectral system provided with an electronically fasttunable liquid-crystal filter, mounted in front of the light source, and with an automatic XY motorized table for accurate spatial scanning of large paintings. A GretagMacbeth ColorChecker® and 2 oil paintings were imaged by the proposed hyerspectral system and the spectral reflectance of each pixel was estimated. The quality of the spectral recovery was quantified by comparing the spectral reflectance estimated with the hyperspectral system with that measured with a telespectroradiometer. The comparisons produced average root mean square errors less than 1.3%, and average colorimetric differences less than 1.7 ΔE*ab units and less than 1.0 ΔE00 units. These data suggest that the described hyperspectral system can record spectral and colorimetric information from artistic oil paintings with high accuracy.

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F.M.P.B. Ferreira, P.T. Fiadeiro, S.M.C. Nascimento, V.M.N. de Almeida, M.J.T. Pereira, J.M.D.P. Bernardo, "Spectral characterization of a hyperspectral system for imaging of large art paintingsin Proc. IS&T CGIV 2006 3rd European Conf. on Colour in Graphics, Imaging, and Vision,  2006,  pp 350 - 354,

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