Abstract
Abstract. In this paper we are presenting our approach and workflow for macro photogrammetry as a complementary method for 3D digitization of polychromies on wood support. Macro photogrammetry can be used for detailed documentation of physical damages in painting layers, underlayers or support. For a better presentation of the context, a selection of typical physical damages, relevant to this study, are explained. Two case studies are presented. Two wooden icons realized with different techniques and presenting different types of physical deterioration. The experiments detailed within this paper represent the first epoch of long-term monitoring of the restoration interventions for each of these icons. All the stage of our workflow is thoroughly detailed with acquisition parameters and processing settings in order to better understand the results and where things can be improved. For each icon a full body photogrammetry process is described, followed by macro photogrammetry on smaller selected areas on the icons' surfaces. Macro magnifications of 1 : 1 and 2 : 1 are obtained by using a dedicated macro lens and extension rings. Lighting setups and focus stacking process are also described for a better understanding of the parameters and settings used.
Highlights
IntroductionCultural heritage assets are constantly exposed to a variety of risks
1.1 Context of this studyCultural heritage assets are constantly exposed to a variety of risks
The purpose of this paper was to put some light onto the use of macro photogrammetry and whether this method can be used or not for assessing different types of physical and chromatic damage in the polychrome surfaces
Summary
Cultural heritage assets are constantly exposed to a variety of risks. Whether it is the human hand (intentional - vandalism, unintentional - accidents) or natural phenomena and conditions (humidity, temperature, light or natural accidents), the integrity and quality of these goods is endangered without a good conservation plan. If not the majority, of these risks can be prevented or at least controlled by preventive conservation measures (ICOM-CC membership, 2008). A mandatory measure in the preventive conservation practice is the monitoring and control of the environment of the storage conditions. Humidity, light and pollutants are adjustable parameters that can be artificially modified by man depending on the physicochemical properties and the state of conservation of the constituent materials and surfaces of the protected objects.
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