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.
Document type: | Book Section |
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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 > Institut für Mathematik |
DDC-classification: | 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 |