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Periodic photogrammetric monitoring and surface reconstruction of a historical wood panel painting for restoration purposes

Robson, S; Bucklow, S; Woodhouse, N; Papadaki, H; (2004) Periodic photogrammetric monitoring and surface reconstruction of a historical wood panel painting for restoration purposes. In: (pp. pp. 395-400).

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Abstract

© 2014 ISPRS. All Rights Reserved. The Westminster Retable is a work of art occupying a central position in late thirteenth century painting in Europe. It is 3.4m long, 1m high and about 0.1m thick and consists of an oak support which carries numerous decorative and structural features and materials including: wood carvings, paintings, glass, dowels, metal, stone and vellum. During the restoration process it is necessary to conduct environmental response monitoring and mechanical deformation checking to ensure the integrity of the Retable. A multi-image digital photogrammetric system has been chosen for this purpose since it offers a periodic method of non-contact recording. However the image record and its associated spatial data can be used for other purposes including providing the basis of a visual database used to manage the conservation process and to automatically generate a 3D surface model which allows the art conservator to make measurements and comparisons between different parts of the structure. This paper describes the use of a photogrammetric system for high precision monitoring during the conservation process using multiphoto network adjustments, camera calibration and stochastic deformation analysis techniques. The technique has been able to monitor discrete points on the surface of the Retable to precisions of 20 micrometers. Techniques are then described which have allowed the automatic generation of an accurate surface model from the multi-photo image record. This latter work draws upon an integration of point interest algorithms, multi-photo image matching, epipolar geometry, extracted lines and edges to automatically generate a dense point cloud and triangulated surface model. These methods are integrated within an error propagation model to ensure the precision and reliability of the extracted data. The model is currently being integrated into the art conservation database system with the aim of allowing conservators to make dimensional and shape comparisons between some 3000 different structural elements on the Retable.

Type: Proceedings paper
Title: Periodic photogrammetric monitoring and surface reconstruction of a historical wood panel painting for restoration purposes
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: http://discovery.ucl.ac.uk/id/eprint/38692
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