REVIEW OF GEOMETRIC AND RADIOMETRIC ANALYSES OF PAINTINGS Fabio Remondino (remondino@fbk.eu) Alessandro Rizzi (rizziale@fbk.eu) Bruno Kessler Foundation (FBK), Trento, Italy Luigi Barazzetti (luigi.barazzetti@polimi.it) Marco Scaioni (marco.scaioni@polimi.it) Francesco Fassi (francesco.fassi@polimi.it) Raffaella Brumana (raffaella.brumana@polimi.it) Politecnico di Milano, Milan, Italy Anna Pelagotti (anna.pelagotti@ino.it) Istituto Nazionale di Ottica, Florence, Italy (Extended version of a paper presented at the ISPRS Commission V Symposium on ‘‘Close Range Image Measurement Techniques’’ hosted by Newcastle University, 22nd to 24th June 2010) Abstract This paper presents an overview of a number of diagnostic campaigns carried out to assess the conservation state of paintings. The specific characteristics required in cultural heritage applications have been investigated and are reported, where two main fields are considered: radiometric analyses using multispectral images and 3D surveying for geometric deformation analysis by means of photogrammetry and laser scanning. The activities described were accomplished in interdisciplinary teams, composed of photogrammetrists, art-historians, restorers and experts of non- destructive diagnostic techniques. Keywords: 3D surveying, close range photogrammetry, cultural heritage, deformation analysis, multispectral imaging Multispectral and multimodal images, as well as range data, are fundamental in the cultural heritage conservation domain, since they allow the faithful documentation, testing, digital archiving, computer-aided restoration and digital preservation of artworks at different scales. Multimodal data are data related to the same object or scene but acquired by different sensors or in different modes, for instance, using different illuminators. Multispectral images are a collection of images related to the same object or scenes, acquired in different spectral bands, generally contiguous, of the visible (or near-visible) spectrum. In the case of paintings, multispectral imaging and 3D surveying (Fig. 1) can be used for pigment identification, precise The Photogrammetric Record 26(136): 439–461 (December 2011) DOI: 10.1111/j.1477-9730.2011.00664.x Ó 2011 The Authors. The Photogrammetric Record Ó 2011 The Remote Sensing and Photogrammetry Society and Blackwell Publishing Ltd. Blackwell Publishing Ltd. 9600 Garsington Road, Oxford OX4 2DQ, UK and 350 Main Street Malden, MA 02148, USA.