GCH 2022 - Eurographics Workshop on Graphics and Cultural Heritage

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https://diglib.eg.org/handle/10.2312/2633215

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Browsing GCH 2022 - Eurographics Workshop on Graphics and Cultural Heritage by Subject "Arts and humanities"

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    Context-based Surface Pattern Completion of Ancient Pottery
    (The Eurographics Association, 2022) Lengauer, Stefan; Preiner, Reinhold; Sipiran, Ivan; Karl, Stephan; Trinkl, Elisabeth; Bustos, Benjamin; Schreck, Tobias; Ponchio, Federico; Pintus, Ruggero
    Among various ancient cultures it was common practice to adorn pottery artifacts with lavish surface decoration. While the applied painting styles, color schemes and displayed mythological content may vary greatly, the presence of simple patterns which appear in a repetitive manner can be observed across civilizations and periods. Such pattern sequences generally are arranged in a structured manner in ornament bands or columns that extend over the entire surface of the object. Due to the poor conservation state of many cultural heritage objects, parts of the surface are oftentimes badly damaged or missing altogether. Yet, if the majority of a pattern sequence is preserved, this information can be leveraged to approximate its missing parts. We present an approach that allows the fully automatic determination of the generation rule inherent to a repetitive surface pattern. Based on this generation rule and the preserved patterns from the same pattern class we propose a workflow for reconstruct missing or damaged parts of the surface painting. We evaluate our approach by applying it to a selection of pottery from ancient Peruvian and Greek cultures, showing that our automatic approach is able to handle a variety of problem cases.
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    A Course on the Digital Humanities for the Premodern World
    (The Eurographics Association, 2022) Rushmeier, Holly; Chen, Anne; Ponchio, Federico; Pintus, Ruggero
    With the roots of digital humanities in text-centric disciplines, coursework has traditionally focused on instruction in skills of relevance for text-based resources, while digital methods for non-textual sources have remained in the minority. We describe a digital humanities course targeted at undergraduate computer science majors and graduate students in cultural heritage adjacent fields. The course foregrounds a specific blend of text-based and visual methods of relevance to practitioners in cultural heritage fields. Acknowledging that digital projects in the humanities are more often than not cross-disciplinary and collaborative, the course is designed to emphasize visual computing techniques while helping students develop experience in cross-disciplinary communication. The requirements for the two groups are different to ensure that all students are challenged. The course includes a substantial group project. Each group is composed of both humanities and computer science students and the project goal is defined by the humanities students. The purpose of the project is both to apply methods learned in the course and to learn collaboration in a team with individuals with different levels and types of expertise.
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    Ebb & Flow: Uncovering Costantino Nivola's Olivetti Sandcast through 3D Fabrication and Virtual Exploration
    (The Eurographics Association, 2022) Ahsan, Moonisa; Altea, Giuliana; Bettio, Fabio; Callieri, Marco; Camarda, Antonella; Cignoni, Paolo; Gobbetti, Enrico; Ledda, Paolo; Lutzu, Alessandro; Marton, Fabio; Mignemi, Giuseppe; Ponchio, Federico; Ponchio, Federico; Pintus, Ruggero
    We report on the outcomes of a large multi-disciplinary project targeting the physical reproduction and virtual documentation and exploration of the Olivetti sandcast, a monumental (over 100m2) semi-abstract frieze by the Italian sculptor Costantino Nivola. After summarizing the goal and motivation of the project, we provide details on the acquisition and processing steps that led to the creation of a 3D digital model. We then discuss the technical details and the challenges that we have faced for the physical fabrication process of a massive physical replica, which was the centerpiece of a recent exhibition. We finally discuss the design and application of an interactive web-based tool for the exploration of an annotated virtual replica. The main components of the tool will be released as open source.
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    Multispectral Imaging for Historical Artifacts: A Case Study Using an 8th-Century Biblical Scroll
    (The Eurographics Association, 2022) Arnold, Etta; Moyer, Izzy; Bourgeois, Alana; Mei, Parker; Decker, Juilee; Easton Jr., Roger; Messinger, David; Ponchio, Federico; Pintus, Ruggero
    Many objects of interest in cultural heritage, such as manuscripts, scrolls, and books are faded, damaged, or otherwise unreadable so that useful studies of them are difficult. Fortunately, modern imaging tools, including sensors, lenses, and illumination sources have leveraged multispectral imaging as an accessible method for cultural heritage imaging which has, in turn, increased the demand for its use. To address this, the Rochester Institute of Technology received a grant from the National Endowment for the Humanities (PR-268783-20) to develop a low-cost, portable imaging system with processing software that could be utilized by scholars accessing collections in library, archive, and museum settings, as well as staff working within these institutions. This article gives an overview of this system and uses an 8th-century Hebrew manuscript as a case study to demonstrate the impact of such a low-cost, low barrier-to-entry system on cultural heritage research, preservation, and dissemination.
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    Tactile prints in colour: Studying the Visual Appearance of 2.5D Prints for Heritage Recreations
    (The Eurographics Association, 2022) Trujillo-Vazquez, Abigail; Rodriguez Echavarria, Karina; Weyrich, Tim; Ponchio, Federico; Pintus, Ruggero
    Printing applications for heritage recreation are a means to allow audiences to appreciate details and engage with cultural materials through closer interaction. A 2.5D print is a media suitable to incorporate visual and tactile qualities such as colour, low relief, textures and roughness. Designing a colour-accurate tactile print requires, nevertheless, anticipating how specific shapes and meso-geometries will affect the reflective properties of the surface, thus changing its appearance. Hence, this paper contributes to improve the understanding of the interaction between geometry and colour when deploying 2.5D prints so that tactile portable replicas can be easily produced. For this, we have produced a series of 2.5D printed patches with varying meso-textures, based on procedural noise functions, and measured their colour coordinates and glossiness. We aim to find a correlation between colour shift (expressed as lightness, chroma and ?E) and the scale and distribution of surface details.