Automatic multi-image photo-texturing of 3D surface models obtained with laser scanning

dc.contributor.author	Γραμματικόπουλος, Λάζαρος	el
dc.contributor.author	Καλησπεράκης, Ηλίας	el
dc.contributor.author	Καρράς, Γιώργος	el
dc.contributor.author	Κόκκινος, Τριαντάφυλλος-Φίλης	el
dc.contributor.author	Πέτσα, Έλλη	el
dc.date.accessioned	2015-01-29T11:33:29Z
dc.date.available	2015-01-29T11:33:29Z
dc.date.issued	2015-01-29
dc.identifier.uri	http://hdl.handle.net/11400/5050
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/us/	*
dc.subject	Automation
dc.subject	Texture
dc.subject	Laser scanning
dc.subject	Orthorectification
dc.subject	DEM/DTM
dc.subject	Visualization
dc.subject	Heritage Conservation
dc.subject	Υφή
dc.subject	Αυτοματισμός
dc.subject	Ορθοαναγωγή
dc.subject	Νοερά απεικόνηση
dc.subject	Διατήρησης της πολιτιστικής κληρονομιάς
dc.title	Automatic multi-image photo-texturing of 3D surface models obtained with laser scanning	en
heal.type	conferenceItem
heal.classification	Technology
heal.classification	Photogrammetry
heal.classification	Τεχνολογία
heal.classification	Φωτογραμμετρία
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85133147
heal.classificationURI	http://skos.um.es/unescothes/C02980
heal.classificationURI	N/A-Τεχνολογία
heal.classificationURI	N/A-Φωτογραμμετρία
heal.keywordURI	http://id.loc.gov/authorities/subjects/sh2001008980
heal.language	en
heal.access	free
heal.recordProvider	Τ.Ε.Ι. Αθήνας, Σχολή Τεχνολογικών Εφαρμογών, Τμήμα Μηχανικών Πληροφορικής και Μηχανικών Τοπογραφίας & Γεωπληροφορικής	el
heal.publicationDate	2004-10-25
heal.bibliographicCitation	Grammatikopoulos, L., Kalisperakis, I., Karras, G., Kokkinos, T. and Petsa, E. (2004). Automatic multi-image photo-texturing of 3D surface models obtained with laser scanning. CIPA International Workshop on Vision Techniques Applied to the Rehabilitation of City Centres, Lisbon, 25-27/10/2004. Available from: http://portal.survey.ntua.gr/main/labs/photo/staff/gkarras/Karras_cipa_Lisbon_04.pdf.	en
heal.abstract	The basic photogrammetric deliverable in heritage conservation is orthophotography (and other suitable raster projections) – closely followed today by a growing demand for photo-textured 3D surface models. The fundamental limitation of conventional photogram-metric software is twofold: it can handle neither fully 3D surface descriptions nor the question of image visibility. As a consequence, software which ignores both surface and image occlusions is clearly inadequate for the complex surface topography encountered, as a rule, in conservation or restoration tasks; geometric accuracy and good visual quality are then possible only at the cost of tiresome human interaction, especially in the phase of surface modeling. However, laser scanning and powerful modeling/editing software allow today fast and accurate collection of vast numbers of surface points and the creation of reliable 3D meshes. Close-range photo-grammetry is obviously expected to extend its horizon by taking full advantage of this new possibility. Here an approach is presented for the automated generation of orthoimages and perspective views from fully 3D surface descriptions derived from laser scanning. Initially, the algorithm detects surface occlusions for the novel view. Next – in contrast to conventional photogrammetric software which requires an operator to define individual original images as the source for image content – all avail-able images participate in a view-independent texturing of the new image. Thus, following a bundle adjustment, all surface triangles are back-projected onto all initial images to establish visibilities. Texture “blending” is realised via an appropriate weighting scheme, which regulates the local radiometric contribution of each original image involved. Finally, a basic statistical test allows to automati-cally filter out outlying colour values. At its present stage of implementation, the algorithm has been tried at the example of a Byzan-tine church in Athens. It is concluded that the presented combination of laser scanning with photogrammetry – resulting in geometric accuracy, high visual quality and speed – is essentially capable to automatically create novel views from several images, and hence provide a realistic, practicable approach in heritage conservation. Finally, several elaborations of the approach are also suggested.	en
heal.fullTextAvailability	true
heal.conferenceName	CIPA International Workshop on Vision Techniques Applied to the Rehabilitation of City Centres	en
heal.conferenceItemType	full paper