Εμφάνιση απλής εγγραφής

dc.contributor.author Πρόκος, Αντώνης el
dc.contributor.author Καρράς, Γιώργος el
dc.contributor.author Γραμματικόπουλος, Λάζαρος el
dc.date.accessioned 2015-01-28T09:33:24Z
dc.date.available 2015-01-28T09:33:24Z
dc.date.issued 2015-01-28
dc.identifier.uri http://hdl.handle.net/11400/4909
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.source http://portal.survey.ntua.gr/main/labs/photo/staff/gkarras/Karras_Cipa_09a.pdf el
dc.subject Triangulation
dc.subject Photogrammetric scanning
dc.subject Surface reconstruction
dc.subject Epipolar geometry
dc.subject Camera calibration
dc.subject Φωτογραμμετρική σάρωση
dc.subject Ανακατασκευή επιφάνειας
dc.subject Τριγωνισμός
dc.subject Επιπολική γεωμετρία
dc.subject Βαθμονόμηση κάμερας
dc.title Design and evaluation of a photogrammetric 3D surface scanner en
heal.type conferenceItem
heal.classification Photogrammetry--Digital techniques
heal.classification Φωτογραμμετρία
heal.classificationURI http://id.loc.gov/authorities/subjects/sh2006001819
heal.classificationURI **N/A**-Φωτογραμμετρία
heal.keywordURI http://id.loc.gov/authorities/subjects/sh85137410
heal.language en
heal.access free
heal.recordProvider Σχολή Τεχνολογικών Εφαρμογών. Τμήμα Πολιτικών Μηχανικών Τ.Ε. και Μηχανικών Τοπογραφίας και Γεωπληροφορικής. Κατεύθυνση Πολιτικών Μηχανικών Τ.Ε. el
heal.publicationDate 2009
heal.bibliographicCitation Prokos A., Karras, Α., Grammatikopoulos, L., Design and evaluation of a photogrammetric 3D surface scanner. XXII CIPA Symposium on Digital Documentation, Interpretation & Presentation of Cultural Heritage, October 11-15, 2009, Kyoto, Japan el
heal.abstract This paper presents a low-cost 3D surface scanner, composed of two fixed web cameras and a hand-held planar laser beam. Setup pre-calibration provides interior orientations of the cameras and their scaled relative orientation. Our calibration algorithm, based on bundle adjustment, uses image pairs of a chessboard, whose nodes are identified automatically and referred to the ground points. For scanning, synchronized image pairs are continuously recorded from each location of the static cameras as the laser source is slowly moved by hand; each pair thus records a profile of the 3D surface intersected by the laser plane. Epipolar resampling reduces the search for point correspondences to finding the intersections of homologous epipolar lines with the recorded laser profile. After a smoothing operation, peaks are identified as the maxima of Gaussian curves fitted to the gray-value data along the epipolar lines; the final identification of peaks involves information from the neighbourhood of the initial estimation. An innovative aspect is that the photogrammetric triangulation of 3D points gains in robustness by enforcing extra geometric constraints. Thus, all points of a profile must lie on a laser plane, whose coefficients are involved as unknowns in the 3D reconstruction adjustment. This allows identifying blunders in peak detection; for epipolar lines with more peaks, only points which, when reconstructed, satisfy a distance threshold from the laser plane participate in the final 3D data set. Furthermore, the object is placed in a corner (the equations of its two planes in the setup system are found automatically by prior scanning), which is intersected by the laser plane in two lines. Their points are identified and constrained to simultaneously satisfy both the corresponding plane equation and the equation of the laser plane. Using available modeling software, individual scans are finally triangulated and merged into a single 3D surface model, which may also be draped with image photo-texture. First results indicate that an accuracy better than 0.3 mm appears as feasible with this setup. en
heal.fullTextAvailability true
heal.conferenceName . XXII CIPA Symposium on Digital Documentation, Interpretation & Presentation of Cultural Heritage en
heal.conferenceItemType short paper


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Εμφάνιση απλής εγγραφής

Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες Εκτός από όπου ορίζεται κάτι διαφορετικό, αυτή η άδεια περιγράφεται ως Αναφορά Δημιουργού-Μη Εμπορική Χρήση-Όχι Παράγωγα Έργα 3.0 Ηνωμένες Πολιτείες