19 September 2013 Spectral interrogation of a several-hundred-years old painting with a broadband IR camera
Author Affiliations +
Previously, we examined an unknown several-hundred-year old undocumented painting for presence of any identifying symbols. Employing diverse IR techniques, we found invisible signatures, dates, and under-drawings. Here, we describe the theory of color in IR: we propose that the area on the painting where three constituent colors are present in approximately the same amount corresponds to a gray in IR. While IR imaging indeed functions well to identify invisible symbols, some spectral regions are more easily read than others, when symbols are written out with gray levels that significantly differ from those of the background. We observe different transparency on several areas of the painting with the IR LED illumination at 1.2 μm, indicating touch-ups and reparations after the creation of the original art piece.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Gonzalo Paez, Gonzalo Paez, Marija Strojnik, Marija Strojnik, "Spectral interrogation of a several-hundred-years old painting with a broadband IR camera", Proc. SPIE 8867, Infrared Remote Sensing and Instrumentation XXI, 886711 (19 September 2013); doi: 10.1117/12.2022210; https://doi.org/10.1117/12.2022210


High-resolution infrared imaging
Proceedings of SPIE (August 02 2010)
Half-active IR night-viewer system
Proceedings of SPIE (August 12 1998)
Becoming a NIR-sensitive aerial archaeologist
Proceedings of SPIE (October 22 2007)
A novel sensor system for 3D face scanning based on...
Proceedings of SPIE (February 24 2008)

Back to Top