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Quantifying Deformation in Aegean Sealing Practices

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Computer Vision, Imaging and Computer Graphics Theory and Applications (VISIGRAPP 2019)

Part of the book series: Communications in Computer and Information Science ((CCIS,volume 1182))

Abstract

In Bronze Aegean society, seals played an important role by authenticating, securing and marking. The study of the seals and their engraved motifs provides valuable insight into the social and political organization and administration of Aegean societies. A key research question is the determination of authorship and origin. Given several sets of similar impressions with a wide geographical distribution on Crete, and even beyond the island, the question arises as to whether all of them originated from the same seal and thus the same seal user. Current archaeological practice focuses on manually and qualitatively distinguishing visual features. In this work, we quantitatively evaluate and highlight visual differences between sets of seal impressions, enabling archaeological research to focus on measurable differences. Our data are plasticine and latex casts of original seal impressions acquired with a structured-light 3D scanner. Surface curvature of 3D meshes is computed with Multi-Scale Integral Invariants (MSII) and rendered into 2D images. Then, visual feature descriptors are extracted and used in a two-stage registration process. A rough rigid fit is followed by non-rigid fine-tuning on basis of thin-plate splines (TPS). We compute and visualize all pairwise differences in a set of seal impressions, making outliers easily visible showing significantly different impressions. To validate our approach, we construct a-priori synthetic deformations between impressions that our method reverses. Our method and its parameters is evaluated on the resulting difference. For testing real-world applicability, we manufactured two sets of physical seal impressions, with a-priori known manufactured differences, against which our method is tested.

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Notes

  1. 1.

    Further introductory information can be found at https://www.uni-heidelberg.de/fakultaeten/philosophie/zaw/cms/seals/sealsAbout.html.

  2. 2.

    https://gigamesh.eu.

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Acknowledgments

We genuinely thank and greatly appreciate the efforts of Maria Anastasiadou co-supervisor of the “Corpus der Minoischen und Mykenischen Siegel” (CMS). We sincerely thank Markus Kühn for his contributions to our tooling. Katharina Anders for her feedback on related work We gratefully thank BMBF eHeritage II for funding this work and ZuK 5.4 for additional funding for this work.

Author information

Authors and Affiliations

  1. Forensic Computational Geometry Laboratory, Heidelberg University, Heidelberg, Germany

    Bartosz Bogacz & Hubert Mara

  2. Heidelberg Corpus der Minoischen und Mykenischen Siegel, Heidelberg University, Heidelberg, Germany

    Sarah Finlayson & Diamantis Panagiotopoulos

Authors
  1. Bartosz Bogacz
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  2. Sarah Finlayson
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  3. Diamantis Panagiotopoulos
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  4. Hubert Mara
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Corresponding author

Correspondence to Bartosz Bogacz .

Editor information

Editors and Affiliations

  1. University of Lisbon, Lisbon, Portugal

    Ana Paula Cláudio

  2. University of Rennes 1, Rennes, France

    Kadi Bouatouch

  3. University of Genoa, Genoa, Italy

    Manuela Chessa

  4. Mines ParisTech, Paris, France

    Alexis Paljic

  5. Linnaeus University, Växjö, Sweden

    Andreas Kerren

  6. French Civil Aviation University (ENAC), Toulouse, France

    Christophe Hurter

  7. University Jean Monnet, Saint-Etienne, France

    Alain Tremeau

  8. University of Catania, Catania, Italy

    Giovanni Maria Farinella

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Bogacz, B., Finlayson, S., Panagiotopoulos, D., Mara, H. (2020). Quantifying Deformation in Aegean Sealing Practices. In: Cláudio, A., et al. Computer Vision, Imaging and Computer Graphics Theory and Applications. VISIGRAPP 2019. Communications in Computer and Information Science, vol 1182. Springer, Cham. https://doi.org/10.1007/978-3-030-41590-7_25

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  • DOI: https://doi.org/10.1007/978-3-030-41590-7_25

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-030-41589-1

  • Online ISBN: 978-3-030-41590-7

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