Abstract
In the theory of formal languages, two-dimensional (picture) languages are a generalization of string languages to two dimensions. Pictures may be regarded as digitized finite arrays, occurring in studies concerning pattern recognition, image analysis, cellular automata, and parallel computing. Several studies have been done for generating and (or) recognizing rectangular, triangular, and hexagonal arrays using formal syntactic methods. Motivated by oxide molecular structures, the oxide pictures, a special class of two-dimensional pictures, are considered. Various generating and recognizing schemes, such as the Oxide Tiling System (OXTS), Oxide Wang System (OXWS), Oxide Tile Rewriting Grammar (OXTRG), and Oxide Sgraffito Automata (OXS), have been developed recently. It is found that the family of oxide picture languages recognizable by oxide tiling systems is closed under union, overlapping, half-turn, transpose, anti-transpose, and reflection (both along horizontal and vertical lines), but not closed under quarter-turn and anti-quarter-turn. This paper further discusses some language theoretic results as well.
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Acknowledgements
The authors are grateful to the referees for their very useful comments, which helped to improve the presentation of the paper. The third author would like to express gratitude to the University of Trier, Germany, and Madras Christian College in Chennai, India, for visits in 2019 and 2020.
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Ponraj, H.V., Thamburaj, R., Paramasivan, M. (2023). 2D Oxide Picture Languages and Their Properties. In: Barneva, R.P., Brimkov, V.E., Nordo, G. (eds) Combinatorial Image Analysis. IWCIA 2022. Lecture Notes in Computer Science, vol 13348. Springer, Cham. https://doi.org/10.1007/978-3-031-23612-9_13
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