Fig. 4.

Rebuilding clusters from cores. (A) Spikes clustered by the FCM algorithm (red) and those that should be assigned to the cluster (blue). (B) The location of the cluster core found by FCM (red) does not match with the cluster center. (C) The “correct” core (red) of the cluster (blue) is identified. (D) The distance between the cluster and its neighbors is calculated. (E) The space between the cluster and its neighbors is transformed, so that the cluster (blue) can be rebuilt from its core (red) without stepping on neighboring clusters (gray). Previously removed spikes are attributed to the cluster core. (F) Finally, the full cluster (red) is rebuilt from the core.