699 research outputs found
Methods for 3D Geometry Processing in the Cultural Heritage Domain
This thesis presents methods for 3D geometry processing under the aspects of cultural heritage applications. After a short overview over the relevant basics in 3D geometry processing, the present thesis investigates the digital acquisition of 3D models. A particular challenge in this context are on the one hand difficult surface or material properties of the model to be captured. On the other hand, the fully automatic reconstruction of models even with suitable surface properties that can be captured with Laser range scanners is not yet completely solved. This thesis presents two approaches to tackle these challenges. One exploits a thorough capture of the objectâs appearance and a coarse reconstruction for a concise and realistic object representation even for objects with problematic surface properties like reflectivity and transparency. The other method concentrates on digitisation via Laser-range scanners and exploits 2D colour images that are typically recorded with the range images for a fully automatic registration technique. After reconstruction, the captured models are often still incomplete, exhibit holes and/or regions of insufficient sampling. In addition to that, holes are often deliberately introduced into a registered model to remove some undesired or defective surface part. In order to produce a visually appealing model, for instance for visualisation purposes, for prototype or replica production, these holes have to be detected and filled. Although completion is a well-established research field in 2D image processing and many approaches do exist for image completion, surface completion in 3D is a fairly new field of research. This thesis presents a hierarchical completion approach that employs and extends successful exemplar-based 2D image processing approaches to 3D and fills in detail-equipped surface patches into missing surface regions. In order to identify and construct suitable surface patches, selfsimilarity and coherence properties of the surface context of the hole are exploited. In addition to the reconstruction and repair, the present thesis also investigates methods for a modification of captured models via interactive modelling. In this context, modelling is regarded as a creative process, for instance for animation purposes. On the other hand, it is also demonstrated how this creative process can be used to introduce human expertise into the otherwise automatic completion process. This way, reconstructions are feasible even of objects where already the data source, the object itself, is incomplete due to corrosion, demolition, or decay.Methoden zur 3D-Geometrieverarbeitung im Kulturerbesektor In dieser Arbeit werden Methoden zur Bearbeitung von digitaler 3D-Geometrie unter besonderer BerĂŒcksichtigung des Anwendungsbereichs im Kulturerbesektor vorgestellt. Nach einem kurzen Ăberblick ĂŒber die relevanten Grundlagen der dreidimensionalen Geometriebehandlung wird zunĂ€chst die digitale Akquise von dreidimensionalen Objekten untersucht. Eine besondere Herausforderung stellen bei der Erfassung einerseits ungĂŒnstige OberflĂ€chen- oder Materialeigenschaften der Objekte dar (wie z.B. ReflexivitĂ€t oder Transparenz), andererseits ist auch die vollautomatische Rekonstruktion von solchen Modellen, die sich verhĂ€ltnismĂ€Ăig problemlos mit Laser-Range Scannern erfassen lassen, immer noch nicht vollstĂ€ndig gelöst. Daher bilden zwei neuartige Verfahren, die diesen Herausforderungen begegnen, den Anfang. Auch nach der Registrierung sind die erfassten DatensĂ€tze in vielen FĂ€llen unvollstĂ€ndig, weisen Löcher oder nicht ausreichend abgetastete Regionen auf. DarĂŒber hinaus werden in vielen Anwendungen auch, z.B. durch Entfernen unerwĂŒnschter OberflĂ€chenregionen, Löcher gewollt hinzugefĂŒgt. FĂŒr eine optisch ansprechende Rekonstruktion, vor allem zu Visualisierungszwecken, im Bildungs- oder Unterhaltungssektor oder zur Prototyp- und Replik-Erzeugung mĂŒssen diese Löcher zunĂ€chst automatisch detektiert und anschlieĂend geschlossen werden. Obwohl dies im zweidimensionalen Fall der Bildbearbeitung bereits ein gut untersuchtes Forschungsfeld darstellt und vielfĂ€ltige AnsĂ€tze zur automatischen BildvervollstĂ€ndigung existieren, ist die Lage im dreidimensionalen Fall anders, und die Ăbertragung von zweidimensionalen AnsĂ€tzen in den 3D stellt vielfach eine groĂe Herausforderung dar, die bislang keine zufriedenstellenden Lösungen erlaubt hat. Nichtsdestoweniger wird in dieser Arbeit ein hierarchisches Verfahren vorgestellt, das beispielbasierte Konzepte aus dem 2D aufgreift und Löcher in OberflĂ€chen im 3D unter Ausnutzung von SelbstĂ€hnlichkeiten und KohĂ€renzeigenschaften des OberflĂ€chenkontextes schlieĂt. Um plausible OberflĂ€chen zu erzeugen werden die Löcher dabei nicht nur glatt gefĂŒllt, sondern auch feinere Details aus dem Kontext rekonstruiert. AbschlieĂend untersucht die vorliegende Arbeit noch die Modifikation der vervollstĂ€ndigten Objekte durch Freiformmodellierung. Dies wird dabei zum einen als kreativer Prozess z.B. zu Animationszwecken betrachtet. Zum anderen wird aber auch untersucht, wie dieser kreative Prozess benutzt werden kann, um etwaig vorhandenes Expertenwissen in die ansonsten automatische VervollstĂ€ndigung mit einflieĂen zu lassen. Auf diese Weise werden auch Rekonstruktionen ermöglicht von Objekten, bei denen schon die Datenquelle, also das Objekt selbst z.B. durch Korrosion oder mutwillige Zerstörung unvollstĂ€ndig ist
Optimising additive manufacturing for fine art sculpture and digital restoration of archaeological artefacts
Additive manufacturing (AM) has shown itself to be beneficial in many
application areas, including product design and manufacture, medical models
and prosthetics, architectural modelling and artistic endeavours. For some of
these applications, coupling AM with reverse engineering (RE) enables the
utilisation of data from existing 3D shapes. This thesis describes the
application of AM and RE within sculpture manufacture, in order to optimise
the process chains for sculpture reproduction and relic conservation and
restoration. This area poses particular problems since the original artefacts
can often be fragile and inaccessible, and the finishing required on the AM
replicas is both complex and varied. Several case studies within both
literature and practical projects are presented, which cover essential
knowledge of producing large scale sculptures from an original models as well
as a wide range of artefact shapes and downstream finishing techniques. The
combination of digital technologies and traditional art requires interdisciplinary
knowledge across engineering and fine art. Also, definitions and requirements
(e.g. âaccuracyâ), can be applied as both engineering and artistic terms when
specifications and trade-offs are being considered. The thesis discusses the
feasibility for using these technologies across domains, and explores the
potential for developing new market opportunities for AM. It presents and
analyses a number of case study projects undertaken by the author with a
view to developing cost and time models for various processes used. These
models have then been used to develop a series of "process maps", which
enable users of AM in this area to decide upon the optimum process route to
follow, under various circumstances. The maps were validated and user
feedback obtained through the execution of two further sculpture
manufacturing projects. The thesis finishes with conclusions about the
feasibility of the approach, its constraints, the pros and cons of adopting AM in
this area and recommendations for future research
Proceedings of the 9th Arab Society for Computer Aided Architectural Design (ASCAAD) international conference 2021 (ASCAAD 2021): architecture in the age of disruptive technologies: transformation and challenges.
The ASCAAD 2021 conference theme is Architecture in the age of disruptive technologies: transformation and challenges. The theme addresses the gradual shift in computational design from prototypical morphogenetic-centered associations in the architectural discourse. This imminent shift of focus is increasingly stirring a debate in the architectural community and is provoking a much needed critical questioning of the role of computation in architecture as a sole embodiment and enactment of technical dimensions, into one that rather deliberately pursues and embraces the humanities as an ultimate aspiration
De-Sign Environment Landscape City Atti
La VI Conferenza Internazionale sul Disegno, De_Sign Environment Landscape City_Genova 2020 tratta di: Rilievo e Rappresentazione dellâArchitettura e dellâAmbiente; Il Disegno per il paesaggio; Disegni per il Progetto: tracce - visioni e pre-visioni; I margini i segni della memoria e la cittĂ in progress; Cultura visiva e comunicazione dallâidea al progetto; Le emergenze architettoniche; Il colore e lâambiente; Percezione e identitĂ territoriale; Patrimonio iconografico culturale paesaggistico: arte, letteratura e ricadute progettuali; Segni e Disegni per il Design e Rappresentazione avanzata. Federico Babina, architetto e graphic designer presenta ARCHIVISION, e Eduardo Carazo Lefort, Docente dellâUniversitĂ di Valladolid e Targa dâOro dellâUnione Italiana Disegno la Lectio Magistralis.
The VI International Conference on Drawing, De_Sign Environment Landscape City_Genoa 2020, deals with: Survey and Representation of Architecture and the Environment; Drawing for the landscape; De-signs for the Project: traces-visions and previews; Margins, signs of memory and the city in progress; Visual culture and communication from idea to project; Architectural emergencies; The color and the environment; Perception and territorial identity; Landscape cultural iconographic heritage: art, literature and design implications; Signs and Drawings for Design and Advanced Representation. Federico Babina, architect and graphic designer presents ARCHIVISION, and Professor Eduardo Carazo Lefort-University of Valladolid and Gold Plate of the Italian Design Union presents his Lectio Magistralis
Human experience in the natural and built environment : implications for research policy and practice
22nd IAPS conference. Edited book of abstracts. 427 pp. University of Strathclyde, Sheffield and West of Scotland Publication. ISBN: 978-0-94-764988-3
Architecture handbook 2004
2004 handbook for the faculty of Architectur
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