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Unwrapping Highly-Detailed 3D Meshes of Rotationally Symmetric Man-Made Objects

Rieck, Bastian ; Mara, Hubert ; Krömker, Susanne

In: Proc. of the XXIV. CIPA 2013 Symposium Recording, Documentation and Cooperation for Cultural Heritage. ISPRS - International Society for Photogrammetry and Remote Sensing 2013, pp. 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.

Item Type: Book Section
Title of Book: Proc. of the XXIV. CIPA 2013 Symposium Recording, Documentation and Cooperation for Cultural Heritage
Series Name: ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.
Volume: II-5/W
Publisher: ISPRS - International Society for Photogrammetry and Remote Sensing
Date Deposited: 29 Oct 2013 07:26
Date: 2013
Page Range: pp. 259-264
Faculties / Institutes: 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
The Faculty of Mathematics and Computer Science > Department of Applied Mathematics
Subjects: 000 Generalities, Science
004 Data processing Computer science
500 Natural sciences and mathematics
720 Architecture
730 Plastic arts Sculpture
760 Graphic arts Printmaking and prints
900 Geography and history
Uncontrolled Keywords: Archaeology, Cultural Heritage, Geometry, High resolution, Rendering, Visualization, Colour
Additional Information: 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
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