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Ribeiro, Haroldo V; Zunino, Luciano; Lenzi, Ervin K; Santoro, Perseu A; Mendes, Renio S
PloS one, 08/2012, Letnik: 7, Številka: 8Journal Article
Complexity measures are essential to understand complex systems and there are numerous definitions to analyze one-dimensional data. However, extensions of these approaches to two or higher-dimensional data, such as images, are much less common. Here, we reduce this gap by applying the ideas of the permutation entropy combined with a relative entropic index. We build up a numerical procedure that can be easily implemented to evaluate the complexity of two or higher-dimensional patterns. We work out this method in different scenarios where numerical experiments and empirical data were taken into account. Specifically, we have applied the method to Formula: see text fractal landscapes generated numerically where we compare our measures with the Hurst exponent; Formula: see text liquid crystal textures where nematic-isotropic-nematic phase transitions were properly identified; Formula: see text 12 characteristic textures of liquid crystals where the different values show that the method can distinguish different phases; Formula: see text and Ising surfaces where our method identified the critical temperature and also proved to be stable.
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