Geodesic
On the characteristic set of black and white digital image coefficients constructed in the basis of a hexagonal lattice
Modelirovanie i analiz informacionnyh sistem, Tome 14 (2007) no. 2, pp. 40-43.

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The concepts associated with the calculation of Euler's characteristics of images constructed on the basis of hexagonal lattices are considered. The necessary conditions for a sixteen-dimensional vector with non-negative integer components to be a characteristic set of some image are obtained. 
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I. A. Kapliy; P. G. Parfenov. On the characteristic set of black and white digital image coefficients constructed in the basis of a hexagonal lattice. Modelirovanie i analiz informacionnyh sistem, Tome 14 (2007) no. 2, pp. 40-43. http://geodesic.mathdoc.fr/item/MAIS_2007_14_2_a8/

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