In: Proc. of the XXIV. CIPA 2013 Symposium Recording, Documentation and Cooperation for Cultural Heritage. ISPRS - International Society for Photogrammetry and Remote Sensing 2013, S. 259-264 (ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci. ; II-5/W)
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Abstract
Rotationally symmetric objects commonly occur at archæological finds. Instead of creating 2D images for documentation purposes by manual drawing or photographic methods, we propose a method based on digitally colored surface models that are acquired by 3D scanners, thereby including color information. We then transform these highly-detailed meshes using simple geometrical objects such as cones and spheres and unwrap the objects onto a plane. Our method can handle curved vessel profiles by dividing the surface into multiple segments and approximating each segment with a cone frustum that serves as an auxiliary surface. In order to minimize distortions, we introduce a simple quality measure based on distances of points to a fitted cone. We then extend our method to approximately spherical objects by fitting a sphere on the surface of the object and applying a map projection, namely the equirectangular projection known from cartography. Our implementation generates true-to-scale images from triangular meshes. Exemplary results demonstrate our methods on real objects, ranging from small and medium-sized objects such as clay cones from the Ancient Orient and figural friezes of Greek vessels to extremely large objects such as the remains of a cylindrical tower of Heidelberg Castle.
Dokumententyp: | Buchbeitrag |
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Buchtitel: | Proc. of the XXIV. CIPA 2013 Symposium Recording, Documentation and Cooperation for Cultural Heritage |
Name der Reihe: | ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci. |
Band: | II-5/W |
Verlag: | ISPRS - International Society for Photogrammetry and Remote Sensing |
Erstellungsdatum: | 29 Okt. 2013 07:26 |
Erscheinungsjahr: | 2013 |
Seitenbereich: | S. 259-264 |
Institute/Einrichtungen: | Philosophische Fakultät > Seminar für Sprachen und Kulturen des Vorderen Orients
Philosophische Fakultät > Institut für Klassische Archäologie Philosophische Fakultät > Institut für Byzantinische Archäologie und Kunstgeschichte Philosophische Fakultät > Institut für Ur. -u. Frühgeschichte und Vorderasiast. Archäologie Fakultät für Mathematik und Informatik > Institut für Mathematik |
DDC-Sachgruppe: | 000 Allgemeines, Wissenschaft, Informatik
004 Informatik 500 Naturwissenschaften und Mathematik 720 Architektur 730 Plastik, Numismatik, Keramik, Metallkunst 760 Grafische Verfahren, Drucke 900 Geschichte und Geografie |
Freie Schlagwörter: | Archaeology, Cultural Heritage, Geometry, High resolution, Rendering, Visualization, Colour |
Zusätzliche Informationen: | Creative Commons Attribution 3.0 License. http://www.isprs-ann-photogramm-remote-sens-spatial-inf-sci.net/II-5-W1/259/2013/isprsannals-II-5-W1-259-2013.html |