<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "An optimizational approach for an algorithmic reassembly of fragmented objects"^^ . "In Cambodia close to the Thai border, lies the Angkor-style temple of Banteay Chhmar. Like all nearly forgotten temples in remote places, it crumbles under the ages. By today most of it is only a heap of stones. Manually reconstructing these temples is both complex and challenging: The conservation team is confronted with a pile of stones, the\r\noriginal position of which is generally unkown. This reassembly task resembles a large-scale 3D puzzle. Usually, it is resolved by a team of specialists who analyze each stone, using their experience and knowledge of Khmer culture. Possible solutions are tried and retried and the stones are placed in different locations until the correct one is found. The major drawbacks of this technique are: First, since the stones are moved continuously they are further damaged, second, there is a threat to the safety of the workers due to handling very heavy weights, and third because of the high complexity and labour-intensity of the\r\nwork it takes several months up to several years to solve even a small part of the puzzle.\r\n\r\nThese risks and conditions motivated the development of a virtual approach to reassemble the stones, as computer algorithms are theoretically capable of enumerating all\r\npotential solutions in less time, thereby drastically reducing the amount of work required for handling the stones. Furthermore the virtual approach has the potential to reduce the on-site costs of in-situ analysis. The basis for this virtual puzzle algorithm are high-resolution 3D models of more than one hundred stones. The stones can be viewed as polytopes with approximately cuboidal form although some of them contain additional indentations. Exploiting these and related geometric features and using a priori knowledge of the orientation of each stone speeds up the process of matching the stones.\r\n\r\nThe aim of the current thesis is to solve this complex large-scale virtual 3D puzzle. In order to achieve this, a general workflow is developed which involves 1) to simplify\r\nthe high-resolution models to their most characteristic features, 2) apply an advanced similarity analysis and 3) to match best combinations as well as 4) validate the results.\r\n\r\nThe simplification step is necessary to be able to quickly match potential side-surfaces. It introduces the new concept of a minimal volume box (MVB) designed to closely and storage efficiently resemble Khmer stones.Additionally, this reduced edge-based model is used to segment the high-resolution data according to each side-surface. The second step presents a novel technique allowing to conduct a similarity analysis of virtual temple stones. It is based on several geometric distance functions which determine the relatedness of a potential match and is capable of sorting out unlikely ones. The third step employs graph theoretical methods to combine the similarity values into a correct solution of this large-scale 3D puzzle. The validation demonstrates the high quality and robustness of this newly constructed puzzle workflow.\r\n\r\nThe workflow this thesis presents virtually puzzles digitized stones of fallen straight Khmer temple walls. It is able to virtually and correctly reasemble up to 42 digitized stones requiring a minimum of user-interaction."^^ . "2015" . . . . . . . "Anja"^^ . "Schäfer"^^ . "Anja Schäfer"^^ . . . . . . "An optimizational approach for an algorithmic reassembly of fragmented objects (PDF)"^^ . . . "Dissertation_Schaefer.pdf"^^ . . . "An optimizational approach for an algorithmic reassembly of fragmented objects (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "An optimizational approach for an algorithmic reassembly of fragmented objects (Other)"^^ . . . . . . "preview.jpg"^^ . . . "An optimizational approach for an algorithmic reassembly of fragmented objects (Other)"^^ . . . . . . "medium.jpg"^^ . . . "An optimizational approach for an algorithmic reassembly of fragmented objects (Other)"^^ . . . . . . "small.jpg"^^ . . . "An optimizational approach for an algorithmic reassembly of fragmented objects (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #18008 \n\nAn optimizational approach for an algorithmic reassembly of fragmented objects\n\n" . "text/html" . . . "004 Informatik"@de . "004 Data processing Computer science"@en . . . "510 Mathematik"@de . "510 Mathematics"@en . .