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Communication Dans Un Congrès Année : 2009

"Laser scanning technologies for 2D and 3D imaging and characterization of decorated monumental surfaces"

Résumé

Laser scanning prototypes, formerly developed in active remote sensing systems and in remote vision and metrology devices based on the amplitude modulation technique, have been specialized for high resolution multispectral applications suitable to be used in the characterization of large surfaces relevant to monumental Cultural Heritage. A three colour imaging topologic radar (RGB-ITR) has been developed for high resolution 3D imaging of frescos and successfully utilized in chapels of churches dating back to the Renaissance period. The high resolution 3D models reconstructed have allowed the hyper-realistic rendering of coloured features and the identification of surface irregularities, either in the layers or in the thickness of the underlying plaster, possibly related to otherwise undetectable damages. A laser induced fluorescence scanning system, capable of 2D monochromatic images acquisition on up to 90 different spectral channels in the visible/UV range has been developed and utilized in field campaigns in order to investigate the presence and the aging of consolidants as well as the occurrence of bio degradation. Its utilization in combination with the RGB-ITR on the same field campaign is reported. A new prototype with a line scanner facility for high speed data acquisition has been recently realized and is currently under laboratory tests. Different methods for image classification are presented, examining the possibilities offered for data fusion from different active and passive sensors, based on both optical and acoustical techniques. Two methods have been selected for LIF data processing software, one based on spectral angle mapper and the other one on principal component analysis. Both methods have been implemented to extract the information relevant to conservation strategy and visualize damaged areas in suitable false colour combinations of the collected images. Eventually, an augmented reality system with the possibility of projecting the image reconstruction on the real target has been realized as a tool for accurate surface study and for better fruition. Results on data collected in preliminary laboratory investigations on reference materials and during a recent field campaign on frescos and are reported and discussed
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Dates et versions

hal-02006984 , version 1 (05-02-2019)

Identifiants

  • HAL Id : hal-02006984 , version 1

Citer

R Fantoni, Mario Ferri de Collibus, G Fornetti, M Francucci, M Guarneri, et al.. "Laser scanning technologies for 2D and 3D imaging and characterization of decorated monumental surfaces". Science and Technology for the Safeguard of Cultural Heritage of the Mediterranean Basin, Dec 2009, Cairo, El Salvador. ⟨hal-02006984⟩
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