New methodological approaches in Reflectance Transformation Imaging applications for conservation documentation of cultural heritage metal objects

• Colour, texture and gloss can be used to characterise the visual appearance of a surface. Proposed methodology for raw data processing Reflectance Transformation Imaging (RTI) extraction feature, saliency distance measurement maps. Resulting in automated mapping condition assessment monitoring conservation-restoration treatments. Application on late-Roman bronze coin. techniques, along with their subsequent analysis, are utmost importance documentation conservation processes cultural heritage (CH) objects. Amongst them, is being as tool enhancement surface topography, such decorative details. This paper proposes new approach based advanced RTI analysis document metal artefacts or monitor First, geometric statistical information from stack image relation topography attributes resulting feature maps described. Additionally, possibility quantifying intra- inter-surface changes measurements by applying Mahalanobis (MD) demonstrated. then documenting cleaning treatment late Roman