Languages of Design
Handbook of formal languages, vol. 1: word, language, grammar
Handbook of formal languages, vol. 1: word, language, grammar
Contextual grammars and formal languages
Handbook of formal languages, vol. 2
Marcus Contextual Grammars
Hexagonal Image Processing: A Practical Approach (Advances in Pattern Recognition)
Hexagonal Image Processing: A Practical Approach (Advances in Pattern Recognition)
Representations of Recursively Enumerable Array Languages by Contextual Array Grammars
Fundamenta Informaticae - Contagious Creativity - In Honor of the 80th Birthday of Professor Solomon Marcus
Array Grammars with Contextual Operations
Fundamenta Informaticae
A Connection between Z n and Generalized Triangular Grids
ISVC '08 Proceedings of the 4th International Symposium on Advances in Visual Computing, Part II
IWCIA'04 Proceedings of the 10th international conference on Combinatorial Image Analysis
Contextual hypergraph grammars – a new approach to the generation of hypergraph languages
DLT'06 Proceedings of the 10th international conference on Developments in Language Theory
Geometric transformations on the hexagonal grid
IEEE Transactions on Image Processing
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Hexagonal patterns are known to occur in the literature on picture processing and image analysis. Siromoney et al. constructed hexagonal array grammars for generating hexagonal arrays and hexagonal patterns. On the other hand, Marcus introduced a class of grammars called contextual grammars in contrast to Chomskian grammars that generate words by starting with an initial word and adding iteratively pairs of words called contexts associated to a set of words called selector to the words already obtained. In this paper, we develop a new method of generating hexagonal arrays based on an extension of contextual grammars called parallel contextual hexagonal array grammars. We present necessary conditions for classification of parallel contextual hexagonal array languages, compare with other hexagonal array generating models and study closure properties under union.