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tokens: We are grateful to the University of Catania for providing the funds necessary to carry out the Observational Campaign in La Palma. The Swedish 1-m Solar Telescope is operated on the island of La Palma by the Institute for Solar Physics (ISP) of Stockholm University in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias. We are also grateful to Professor Giovanni Gallo of the University of Catania for his contribution in the implementation of the new segmentation algorithm. This research has received funding from the EC 7th Framework Programme FP7/2007–2013 under the grant agreement SOLARNET (project No. 312495). This work was also supported by the Istituto Nazionale di Astrofisica (PRIN INAF 2014), and by the Italian Ministry of University and Research (PRIN MIUR 2012).