Fast 3D-Vision System to Classify Metallic Coins by their Embossed Topography
Hossfeld, Michael (Hamburg University of Technology)
Chu, Weiyi (Hamburg University of Technology)
Eich, Manfred (Hamburg University of Technology)
Adameck, Markus (Hella KGaA Hueck & Co. (Lippstadt, Alemanya))

Date:	2006
Abstract:	This paper presents a security-related machine-vision solution for real-time classification of moving objects with highly reflective metallic surfaces and complex 3D-structures. As an application example of our so called Three-Color Selective Stereo Gradient Method (Three-Color SSGM) a classification system for three main coin denominations of Euro coins is presented. Such coins are quickly moving in a coin validation system. The objective is to decide only from comparison of specially measured and processed 3D-surface information with characteristic topographical data stored in a database whether a coin belongs to one of the reference classes or has to be rejected as a foreign or counterfeit coin. Under illumination from a three-color light emitting diode equipped ring a single image of the moving coin is captured by a digital color camera. Exploiting the spectral properties of the illumination sources, which correspond to the special spectral characteristics of the camera, three independent subimages can be extracted. Comparison between these subimages leads to a discrimination between a coin with real 3D-surface and a counterfeit coin based on a photographic image of a coin of the same type. After the coin has been located and segmented, grey value based rotation and translation invariant features are extracted from a normalized image. In combination with template matching methods, a coin can be classified. Classification results will be reported for the three main coin denominations of Euro coins.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Reconeixement objecte ; Anàlisi model estructural ; Superfícies metàl·liques ; Tricolor selectiu ; Reconocimiento objeto ; Análisis modelo estructural ; Superficies metálicas ; Tricolor selectivo ; Object Recognition ; Structural Pattern Analysis ; Specular Metallic Surfaces ; Three-Color Selective ; Stereo Gradient Method (Three-Color SSGM)
Published in:	ELCVIA : Electronic Letters on Computer Vision and Image Analysis, V. 5 n. 4 (2006) p. 47-63, ISSN 1577-5097

Adreça original: https://elcvia.cvc.uab.es/article/view/v5-n4-hossfeld-chu-adameck-et-al
Adreça alternativa: https://raco.cat/index.php/ELCVIA/article/view/85344
DOI: 10.5565/rev/elcvia.117

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