GCH 2016 - Eurographics Workshop on Graphics and Cultural Heritage

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https://diglib.eg.org/handle/10.2312/2630933

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Browsing GCH 2016 - Eurographics Workshop on Graphics and Cultural Heritage by Subject "and systems"

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    3D Object Spatial- consistent Texture Maps Appropriate for 2D Image Processing
    (The Eurographics Association, 2016) Ioannakis, George; Koutsoudis, Anestis; Chamzas, Christos; Chiara Eva Catalano and Livio De Luca
    The aim of this work is to generate a spatial-consistent UV maps of a 3D object's texture suitable for 2D image processing algorithms. An approach to produce such a fully spatially consistent UV mapping suitable for image processing based on the planar parameterisation of the mesh is presented. The mesh of a 3D model is parametrised onto a unit square 2D plane using computational conformal geometry techniques. The proposed method is genus independent, due to an iterative 3D mesh cutting procedure. The selection of the initial seed vertex for the mesh-cut is not essential for the parameterisation of the geometry, however it affects heavily the appearance of the obtained texture map. In this work we attempt to determine such a seed vertex, in order the UV map to be suitable for image processing. Having the texture of a 3D model depicted on a spatially continuous two dimensional structure enables us to efficiently apply well known image processing based techniques and algorithms. Our method is applied on a 3D digital replica of an ancient Greek Lekythos vessel.
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    GRAVITATE: Geometric and Semantic Matching for Cultural Heritage Artefacts
    (The Eurographics Association, 2016) Phillips, Stephen C.; Walland, Paul W.; Modafferi, Stefano; Dorst, Leo; Spagnuolo, Michela; Catalano, Chiara Eva; Oldman, Dominic; Tal, Ayellet; Shimshoni, Ilan; Hermon, Sorin; Chiara Eva Catalano and Livio De Luca
    The GRAVITATE project is developing techniques that bring together geometric and semantic data analysis to provide a new and more effective method of re-associating, reassembling or reunifying cultural objects that have been broken or dispersed over time. The project is driven by the needs of archaeological institutes, and the techniques are exemplified by their application to a collection of several hundred 3D-scanned fragments of large-scale terracotta statues from Salamis, Cyprus. The integration of geometrical feature extraction and matching with semantic annotation and matching into a single decision support platform will lead to more accurate reconstructions of artefacts and greater insights into history. In this paper we describe the project and its objectives, then we describe the progress made to date towards achieving those objectives: describing the datasets, requirements and analysing the state of the art. We follow this with an overview of the architecture of the integrated decision support platform and the first realisation of the user dashboard. The paper concludes with a description of the continuing work being undertaken to deliver a workable system to cultural heritage curators and researchers.
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    Semantic Structuring and 3D Modeling of Masonry Structure
    (The Eurographics Association, 2016) Jacquot, Kévin; Luca, Livio De; Chiara Eva Catalano and Livio De Luca
    Studies of architectural heritage require tight control over spatial data. It is an prerequisite for the representation, analysis, conservation and structural restoration of architectural heritage. As regards the morphology of architectural works, the challenge is to move from 3D survey raw data to semantic 3D models. The objective of our project is to develop and experiment a process for the treatment of point clouds in order to create a computational model dedicated to mechanic behavior analysis. Thus, the modeling and semantic structuring is achieved through a knowledge-based approach. Semantic dimension and topological constraints are identified and explicated through the creation of a knowledge model of masonry works. This knowledge is used to implement a set of tools for the reverse engineering of digitized masonry structures.
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    A Soft Union based Method for Virtual Restoration and 3D Printing of Cultural Heritage Objects
    (The Eurographics Association, 2016) Gregor, Robert; Mavridis, Pavlos; Wiltsche, Albert; Schreck, Tobias; Chiara Eva Catalano and Livio De Luca
    Recent improvements in 3D acquisition and shape processing methods lead to increased digitization of 3D Cultural Heritage (CH) objects. Beyond the mere digital archival of CH artifacts, there is an emerging research area dedicated to digital restoration of 3D Cultural Heritage artifacts. In particular several methods have been published recently that, from a digitized set of fragments, enable their reassembly or even the synthesis of missing or eroded parts. Usually the result of such methods is a set of aligned but disconnected parts. However, it is often desirable to produce a single, watertight mesh that can be easily 3D printed. We propose a method based on a volumetric soft union operation that can be used to combine such sets of aligned fragments to a single manifold mesh while producing smooth and plausible geometry at the seams. We assess its visual quality and efficiency in comparison to an adaption of the well-known Poisson Reconstruction method. Finally, we provide practical insights on printing the results produced by our method on digitized fragments of real CH objects.