Abstract
Abstract. Movable heritage preserved in our museums are an invaluable evidence of our past. In order to properly respond to the need of 3D documentation of these significant assets, in the last few years both range-based and image-based solutions have been developed by researchers operating in the framework of Geomatics with a special focus on reaching a high level of detail and on texture radiometric quality, taking into consideration the intrinsic fragility of these kinds of objects which during the survey require a contactless approach. During the presented research a collection of architectural models representing ancient Nubian temples from “Museo Egizio di Torino” had been digitalized using different techniques; in particular, the wooden maquette of the temple of El-Hilla has been acquired using a new structured light handheld laser scanner, the Stonex F6 SR, and applying a close-range photogrammetric approach. In this paper a comparison between the two approaches is proposed as regards acquisition workflow, final results and suitability as regards digitisation of objects belonging to movable heritage and museum collections.
Highlights
The present analysis considers the right part of the Temple of El-Hilla ( Figure 1) as case study whose dimensions are approximatively 80x22x30 cm3
Three scale bars have been placed on the platform and fixed with adhesive tape at the sides of the wooden maquette, in order to provide a metric reference allowing to scale the model during the subsequent phase of data processing
After a manual editing to remove the context of the acquired scene, the Statistical Outlier Removal (SOR) algorithm reduced the noise of the point cloud (Figure 11)
Summary
The research takes place in the framework of B.A.C.K. TO T.H.E. One of the main goals of the project aims to create 3D databases of a collection of wooden maquettes dated back to the XVIII century and belonging to the “Museo Egizio” of Torino These artefacts constitute valuable witnesses of the ancient Nubian temples moved from. A very sensitive aspect of this research project is represented by the realisation of reality-based 3D models of the maquettes with high level of detail, to provide both geometric and radiometric information about the real object. This kind of objects constitute interesting case studies for the present investigation because of their complexity. The whole image acquisition process took of about 35 minutes by considering the time required for the changes of the camera assets and lighting conditions configuration, in addition to the effective time needed to record the digital images
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