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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:54 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
APPLICATIONS OF MULTISPECTRAL IMAGE ANALYSIS IN ARTWORK CONSERVATION – CASE STUDY
Authors:
Walter Maracineanu, Roxana Radvan, Joakim Striber
Affiliation:
National Institute of Research and Development for Optoelectronics
Centre for Restoration by Optoelectronical Techniques
Bucharest – Romania
E-mail
Keywords:
Abstract:
Multispectral image analysis is a technique based on some simple principles. It is sure that different materials absorb the light in different way. It is possible to measure the amount of light absorbed and reflected and to establish precise UV, VIS and NIR spectra of absorbancy or of reflection for substances that compose art objects. The benefit of those capabilities consists in possibility of understanding the way that artwork materials behave beyond visible range. Approaching this idea from a different angle we can consider that electromagnetic waves from UV range to NIR range, including of course visible spectra, go through artwork materials in different ways. If we can develop a specific device that is able to associate certain materials to certain range of former mentioned spectra we can obtain interesting information about multilayer structures.
Such device consists in a high resolution digital camera which can record in separate modes images in UV, visible and NIR spectra. These images are processed, compared and stored using dedicated software. Certain databases offer electronic version of classic conservation-restoration documentation.
Another aspect regarding artwork materials behaviour at different ranges o UV-VIS-NIR spectra is related to identification of differences between almost the same coloured materials. If the most trained human eye can hardly see any difference between two materials and these materials are chemically different somewhere from UV spectra to NIR spectra these materials will look different on computer screen due to selective mode operation of digital camera.
Working with renowned specialists from artwork field we developed a database which contains images with important artwork objects. Future collaborations are expected to develop further our database. Gathering numerous cases will lead us to better understanding visual differences resulted from physical or chemical alteration of material structure, the base of cultural message of artwork objects.
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