Jun-2023 Other https://fordatis.fraunhofer.de/handle/fordatis/281
http://dx.doi.org/10.24406/fordatis/210

Medieval coins of three different types and of various states of preservation

Images and 3D triangle meshes generated with a single-camera, multi-light setup (photometric stereo)

Tauschensky, Anika (Landesamt für Denkmalpflege und Archäologie Sachsen-Anhalt); Mara, Hubert (Martin-Luther-Universität Halle-Wittenberg, Institute of Computer Science); Dunker, Thomas (Fraunhofer-Institut für Fabrikbetrieb und -automatisierung IFF); Trostmann, Erik (Fraunhofer-Institut für Fabrikbetrieb und -automatisierung IFF)

IFF Fraunhofer-Institut für Fabrikbetrieb und -automatisierung
Files in This Item:
FileDescriptionSizeFormat 
Bahrfeldt-19-a.zipfirst 78 of 156 samples of type Bahrfeldt 192,08 GBZIPDownload/Open
Bahrfeldt-19-b.ziplast 78 of 156 samples of type Bahrfeldt 192,05 GBZIPDownload/Open
Mehl-499-a.zipfirst 102 of 204 samples of type Mehl 4993,72 GBZIPDownload/Open
Mehl-499-b.ziplast 102 of 204 samples of type Mehl 4993,74 GBZIPDownload/Open
Mehl-595.zip77 samples of type Mehl 5952,05 GBZIPDownload/Open

Abstract

The dataset contains albedo and normal image and a 3D triangle mesh with additional features (multi scale integral invariants) for the obverse of medieval coins. There are three different types of coins. Within each typ there are many samples of various state of conservation. Numismatists can recognize similarities between samples of one type and differences between samples of different type. We are interested in the development of computer methods, which can measure such similarities and differences based on these digital representations of the coins.

Technical Information

Folders collect the data of different coin types. The data of one coin comprises multiple files, which share the beginning of the file name (identifier_timestamp). Color images are saved in TIFF format with extension .tif. While _albedo represents the color texture, the RGB-channels of _normal stand for the xyz-coordinates of the normal vectors, where the interval [-1, 1] is linearily mapped to [0, 255]. Triangle meshes are saved in PLY format with extension .ply. A JSON file contains meta information as identifiers for collection and "kenom" online catalogue (https://www.kenom.de/), type and resolution.
Classification
943 Geschichte Geschichte Mitteleuropas; Deutschlands
069 Museumswissenschaft
Keywords
medieval coins
photometric stereo
normal, albedo and triangle mesh
multi-scale integral invariants
Funder
Bundesministerium für Bildung und Forschung BMBF (Deutschland)
Staatskanzlei und Ministerium für Kultur des Landes Sachsen-Anhalt
Investitionsbank Sachsen-Anhalt
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