GCH 2017 - Eurographics Workshop on Graphics and Cultural Heritage

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https://diglib.eg.org/handle/10.2312/2631771

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Browsing GCH 2017 - Eurographics Workshop on Graphics and Cultural Heritage by Subject "Arts and humanities"

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    Digitising Ivory Artefacts at the National History Museum in Brazil
    (The Eurographics Association, 2017) Marroquim, Ricardo; Sá, Asla Medeiros e; Echavarria, Karina Rodriguez; Balbio, Vitor; Zamorano, Rafael; Tobias Schreck and Tim Weyrich and Robert Sablatnig and Benjamin Stular
    The advantages of digitisation technologies, such as 3D scanning, photogrammetry and 3D modelling, for the documentation and dissemination of cultural heritage artefacts is well understood by researchers. Nevertheless, practitioners, in particular those in developing countries, still have a lack of understanding of how 3D technologies could work for them in order to support their collections. This paper presents ongoing efforts to engage with museums in Brazil, in particular the National History Museum in Rio de Janeiro, in order to raise awareness of the potential of 3D technologies. Rather than applying 3D digitisation technologies on artefacts where it is known that the techniques can provide an easy solution, our approach was more experiments. Hence, several ivory artefacts were selected, including various figurines and a carved Junk Boat from East Asia which are part of the museum collection and which present particular problems both in terms of conservation and dissemination. The artefacts are complex and difficult to access. Nevertheless, the intention was to provide practitioners at the museum a good understanding on the advantages and limitations of the technologies. The contribution of this paper is the exploration of the use of 3D digitisation technologies for the documentation and dissemination of ivory carvings from a Brazilian perspective. The paper includes a discussion on the challenges in terms of having access to suitable infrastructures to support documenting, monitoring and dissemination of heritage artefacts at a larger scale within the Brazilian context.
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    Exploiting Unbroken Surface Congruity for the Acceleration of Fragment Reassembly
    (The Eurographics Association, 2017) Savelonas, Michalis A.; Andreadis, Anthousis; Papaioannou, Georgios; Mavridis, Pavlos; Tobias Schreck and Tim Weyrich and Robert Sablatnig and Benjamin Stular
    Virtual reassembly problems are often encountered in the cultural heritage domain. The reassembly or "puzzling" problem is typically described as the process for the identification of corresponding pieces within a part collection, followed by the clustering and pose estimation of multiple parts that result in a virtual representation of assembled objects. This work addresses this problem with an efficient, user-guided computational approach. The proposed approach augments the typical reassembly pipeline with a smart culling step, where geometrically incompatible fragment combinations can be quickly rejected. After splitting each fragment into potentially fractured and intact facets, each intact facet is examined for prominent linear or curved structures and a heuristic test is employed to evaluate the plausibility of facet pairs, by comparing the number of feature curves associated with each facet, as well as the geometric texture of associated intact surfaces. This test excludes many pairwise combinations from the remaining part of the reassembly process, significantly reducing overall time cost. For all facet pairs that pass the initial plausibility test, pairwise registration driven by enhanced simulated annealing is applied, followed by multipart registration. The proposed reassembly approach is evaluated on real scanned data and our experiments demonstrate an increase in efficiency that ranges from 30% to more than 500% in some cases, depending on the number of culled combinations.
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    The Fabricated Diorama: Tactile Relief and Context-aware Technology for Visually Impaired Audiences
    (The Eurographics Association, 2017) Samaroudi, Myrsini; Echavarria, Karina Rodriguez; Song, Ran; Evans, Roger; Tobias Schreck and Tim Weyrich and Robert Sablatnig and Benjamin Stular
    The recent popularity of digital fabrication has stimulated cultural heritage professionals to utilise such technologies for a variety of processes, including the creation of digitally fabricated handling objects. The design and production of these objects or replicas, as commonly known, depends on choices that do not only limit themselves to a variety of technologies. This paper presents a focused contribution towards increasing the understanding of the heritage community on how to introduce digitally fabricated objects within context-aware museum experiences for different audiences. The purpose of the project is to enhance enjoyment, learning and appreciation of cultural and natural heritage while avoiding the ''technological fetishism'' which often appears along with the introduction of new technologies. In particular, the paper presents research focusing on the needs of visually impaired and blind audiences; it describes the development of a context-aware tactile experience within the Booth Museum in Brighton (UK); evaluates the developments with this target audience; and presents the preliminary results of the research.