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Title: A character validation proposal for high-speed visual monitoring of expiration codes on beverage cans
Authors: Rodríguez Rodríguez, José Carlos 
De Blasio , Gabriele Salvatore 
García Rodríguez, Carmelo Rubén 
Quesada Arencibia, Francisco Alexis 
UNESCO Clasification: 1203 Ciencia de los ordenadores
Keywords: Image processing
High-speed computing
Optical character recognition (OCR)
Pattern recognition
Industrial inspection, et al
Issue Date: 2019
Journal: Proceedings (MDPI) 
Conference: 13th International Conference on Ubiquitous Computing and Ambient ‪Intelligence - UCAmI 2019 
Abstract: Character recognizers have generally focused on printed text on paper with an emphasis on generality rather than speed. This makes the proposed algorithms not applicable in the context of the very high-speed industrial validation of expiration codes printed on the metal surface of a can. The extreme demands of speed and the adverse effects of lighting and movement, among other things, make it necessary to develop an original and specific strategy. The strategy presented in this paper first selects which of the segmented shapes of a printed can are the best candidates for comparison with expected characters. This is followed by a technique based on the comparison of templates (templates matching), which we call “morphologies”, and are represented as bitmaps to take advantage of the hardware capabilities of general-purpose processors. The use of templates has the advantage of avoiding the construction of a feature vector. In an acquisition test in a real industrial plant, we have been able to successfully treat 438 cans in 44 s, with only one validation error in one character, achieving a compromise between speed and quality that is sufficient for industrial validation in the conditions cited.
ISSN: 2504-3900
DOI: 10.3390/proceedings2019031056
Source: Proceedings (MDPI) [ISSN 2504-3900], v. 31 (1), 56
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