Abstract
Abstract. role in the field of cultural heritage. Making copies of virtual objects is very significant for their consultation, storage, disclosure and restoration. Nowadays the modeling of a free-form object can be attained both by laser-scanning and by digital photogrammetry. With the use of the last methodology dense point clouds can be obtained through elaborate process steps. The purpose of this study is to provide input to the automation of some phases of these processes. Recent advances in the Structure from Motion community have greatly extended the feature matching and triangulation capabilities to enable significantly larger datasets to be used for the reconstruction of the relative orientation of the cameras and, consequently, of the artefacts. In this paper a methodology to automatically orient a set of images is presented, such methodology makes use of algorithms for feature extraction coming from computer vision community and allows to easily recognize a large amount of homologous points on a set of images in a completely automatic way. The above said methodology has been adopted for the automatic orienting of some sequences of images relative to several interesting sites from the perspective of cultural heritage.
Highlights
The introduction of digital 3D modeling in the Cultural Heritage field gives to users the possibility to use 3D models as highly effective and intuitive means of communication as well as interface to share and visualize information collected in databases can be used for virtual tours, for digital storage, or as an aid to restoration operations
It is well known that the reconstruction and three-dimensional modeling may be achieved by either active optical sensors, such as laser scanner, or by using the image-based modeling techniques that are generally preferred in cases of low-budget project
The procedure for the extraction of tie-points has been implemented in a software called AutOrIm (Automatic Orienting Images) which provides the opportunity to export the tie-points to some well-known photogrammetric software to take advantage of their robust bundle adjustment algorithms to establish the orientation parameters of the images
Summary
The introduction of digital 3D modeling in the Cultural Heritage field gives to users the possibility to use 3D models as highly effective and intuitive means of communication as well as interface to share and visualize information collected in databases can be used for virtual tours, for digital storage, or as an aid to restoration operations. The procedure for the extraction of tie-points has been implemented in a software called AutOrIm (Automatic Orienting Images) which provides the opportunity to export the tie-points to some well-known photogrammetric software to take advantage of their robust bundle adjustment algorithms to establish the orientation parameters of the images. The knowledge of such orientation parameters allow the determination of dense cloud of points, by using software such as PMVS2, CLORAMA, or modules NGATE and ATE of SOCET SET suite, that use multi-image matching algorithms (Barazzetti et al 2010, Menna et al 2007, Remondino et al 2006)
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