1 Correction to: Pattern Analysis and Applications https://doi.org/10.1007/s10044-019-00842-y

In the original publication of the article, the below-mentioned acknowledgement was not included and the author would like to add it.

“The research described in this paper was financed by the Czech Ministry of Education in frame of the National Sustainability Program under Grant LO1401. For research, the infrastructure of the SIX Center was used”.