GCH 2019 - Eurographics Workshop on Graphics and Cultural Heritage

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https://diglib.eg.org/handle/10.2312/2632818

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Browsing GCH 2019 - Eurographics Workshop on Graphics and Cultural Heritage by Subject "Arts and humanities"

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    Experiencing Art by Means of 3D Printed Replicas: Enriching the Interpretation of Pot Oiseau
    (The Eurographics Association, 2019) Samaroudi, Myrsini; Echavarria, Karina Rodriguez; Rizvic, Selma and Rodriguez Echavarria, Karina
    Digitally fabricated artefacts or 3D replicas have the potential to enrich the interpretation of cultural assets by enhancing visitors' engagement with collections. However, it is still not well understood how replicas work as interpretative means and what are the actual visitors' attitudes towards them. The contribution of this paper is the development and evaluation of a 3D replica within a realistic interpretative scenario. This research deploys a case study focusing on a 3D printed pot representing an ''authentic'' reproduction of a pot made by Pablo Picasso, currently exhibited at the Brighton Museum and Art Gallery. By detailing the research processes and evaluation results, CH professionals can better perceive the dynamics of replicas as interpretative means within realistic situations; understand their positive contributions and weaknesses; and deploy methods and investigation themes, as presented in this paper. In this way, cultural heritage institutions and especially museums can be assisted when introducing replicas to support their audiences. The developments presented in this paper are part of a larger research project which proposes experience designs or experiential frameworks for the provision of 3D replicas to audiences. Our findings highlight that while there is enormous potential, there is also a need to re-educate people on how to engage with cultural heritage through new interpretative frameworks that are less rigid than those traditionally used in museums.
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    Lens Calibration for Focus Shift Correction in Close-Range Multispectral Imaging
    (The Eurographics Association, 2019) Brenner, Simon; Sablatnig, Robert; Rizvic, Selma and Rodriguez Echavarria, Karina
    Multispectral imaging has become a popular tool to reveal properties and structures in cultural heritage objects that are hidden to the human observer. One of the inherent problems of multispectral imaging applications is chromatic aberration. Due to an extended spectral range, the effect appears more pronounced than in conventional photography in the visible spectrum. This paper is concerned with longitudinal chromatic aberrations, i.e. shifts of the focal plane along the principal axis of the camera, as they are hard to correct in post-processing and should be avoided during acquisition. To this end, a calibration scheme to measure the wavelength- and distance-dependent focal shift behavior of a given camera/lens system is proposed, which allows for a mechanical compensation at acquisition time. The approach is demonstrated on a multispectral imaging system for historical manuscript analysis. We show that the application of this compensation approach enables the acquisition of in-focus images in non-visible wavelengths using a lens optimized for the visible spectrum only.