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. In some implementations, determining whether a motion event candidate is a false positive includes analyzing an importance score for the motion event candidate. The importance score for a motion event candidate is optionally based on zones of interest involved with the motion event candidate, background features, motion vectors, scene features, entity features, motion features, motion tracks, and the like. FIG. 5 illustrates a representative system architecture 500. In some implementations, the server system 164 includes functional modules for an event processor 3146, an event categorizer 507, and a user facing frontend 3150. The event processor 3146 obtains the event candidates e. g. , by processing the video stream, by receiving the event start information from the video source 501, or by detecting a user press on a doorbell button of a doorbell camera.