Assessment of multispectral and hyperspectral imaging systems for digitisation of a Russian icon

Heritage Science

Ruven Pillay¹  Sérgio Nascimento²  João Linhares²  Lindsay W. MacDonald³  Tatiana Vitorino⁴  Marcello Picollo⁵  Joanna Sobczyk⁶  Michał Obarzanowski⁶ 

[1] C2RMF, Musée du Louvre;Department of Physics, University of Minho;Faculty of Engineering Sciences, University College London;Faculty of Science and Technology, Universidade NOVA de Lisboa;IFAC-CNR;National Museum in Kraków;

关键词: Multispectral;    Hyperspectral;    Imaging;    Digitisation;    Reflectance;    Spectrum;   

DOI  :  10.1186/s40494-017-0154-1

来源: DOAJ

【 摘 要 】

Abstract In a study of multispectral and hyperspectral reflectance imaging, a Round Robin Test assessed the performance of different systems for the spectral digitisation of artworks. A Russian icon, mass-produced in Moscow in 1899, was digitised by ten institutions around Europe. The image quality was assessed by observers, and the reflectance spectra at selected points were reconstructed to characterise the icon’s colourants and to obtain a quantitative estimate of accuracy. The differing spatial resolutions of the systems affected their ability to resolve fine details in the printed pattern. There was a surprisingly wide variation in the quality of imagery, caused by unwanted reflections from both glossy painted and metallic gold areas of the icon’s surface. Specular reflection also degraded the accuracy of the reconstructed reflectance spectrum in some places, indicating the importance of control over the illumination geometry. Some devices that gave excellent results for matte colour charts proved to have poor performance for this demanding test object. There is a need for adoption of standards for digitising cultural heritage objects to achieve greater consistency of system performance and image quality.

【 授权许可】

Unknown