In some implementations, the video portion after an event start incident is detected is divided into multiple segments. In some implementations, the segmentation continues until event end information sometimes also called an “end of event signal” is obtained. In some implementations, the segmentation occurs within the server system 164 e. g. , by the event processor module 3146. In some implementations, the segmentation includes generating overlapping segments. For example, a 10 second segment is generated every second, such that a new segment overlaps the prior segment by 9 seconds. In some implementations, after the event processor module obtains the video portion corresponding to an event candidate, the event processor module 3146 obtains background factors and performs motion entity detection identification, motion vector generation for each motion entity, and feature identification. Once the event processor module 3146 completes these tasks, the event categorizer module 3148 aggregates all of the information and generates a categorization for the motion event candidate. In some implementations, false positive suppression is optionally performed to reject some motion event candidates before the motion event candidates are submitted for event categorization. In some implementations, determining whether a motion event candidate is a false positive includes determining whether the motion event candidate occurred in a particular zone.