999 resultados para Numismatics, Roman


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Contains bibliographical references.

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Frontispiece port. of Visconti and [23] leaves of plates (most folded) etched/engraved by Locatelli.

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Includes indexes.

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Includes bibliographical references.

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Mode of access: Internet.

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Earlier edition has title: Münzen und Medaillen.

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"Zusammenstellung der einschlägigen und benützten literatur": p. v-vi.

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"Di questo volume pubblicato il 20 Giugno 1870, si stamparono copie 304 ordinatamente numerati. N. 213".

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Head- and tailpieces; initials.

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Mode of access: Internet.

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Classification of coins is an important but laborious aspect of numismatics - the field that studies coins and currency. It is particularly challenging in the case of ancient coins. Due to the way they were manufactured, as well as wear from use and exposure to chemicals in the soil, the same ancient coin type can exhibit great variability in appearance. We demonstrate that geometry-free models of appearance do not perform better than chance on this task and that only a small improvement is gained by previously proposed models of combined appearance and geometry. Thus, our first major contribution is a new type of feature which is efficient in terms of computational time and storage requirements, and which effectively captures geometric configurations between descriptors corresponding to local features. Our second contribution is a description of a fully automatic system based on the proposed features, which robustly localizes, segments out and classifies coins from cluttered images. We also describe a large database of ancient coins that we collected and which will be made publicly available. Finally, we report the results of empirical comparison of different coin matching techniques. The features proposed in this paper are found to greatly outperform existing methods.