Homogeneity of the mesoporous photonic crystal structure is estimated by an electron photograph of its surface. A method of crystal surface division into domains by correlation processing of the digital image is proposed. The following parameters are recommended as main numerical characteristics of pore system ordering: the average and maximum linear sizes of the domain, as well as the fraction of regular structures in the sample. Using these and some additional parameters, one can distinguish even qualitatively very close structures. Images from different sources are compared.
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