1. An apparatus comprising: a plurality of cameras respectively configured and arranged to capture images of regions of a common premises; and a filter circuit configured and arranged to detect the presence of individuals in the images, and to filter the detected presence by tracking the location of at least one authorized user relative to the premises via location-based information indicative of each authorized user's location, and for each detected individual in the images: identifying a location of the detected individual, comparing the identified location of the detected individual to the tracked location of the at least one authorized user, and in response to the comparison indicating that the identified location is not common to the tracked location on the premises, facilitating identification of the detected individual as being an unauthorized individual.