Patent attributes
Linked zones define the temporal and spatial relationships among multiple zones of a surveillance area, and are used to model an object's disappearance from one zone, for potential reappearance at another zone. One or more zones are defined within each camera's field of view. Two zones are linked if an object that disappears from one zone is capable of appearing in the other zone. Each link has an associated delay parameter or function that characterizes the time delay, if any, between a disappearance and subsequent appearance. For each zone, a set of other zones that are linked to this zone is maintained. When an object disappears from a zone, the set of other zones that are linked to this zone is used to reduce the search space for object appearances corresponding to this disappearance. When the corresponding object appearance is found, the tracking function is handed-off to the tracking module associated with the zone in which the object appeared.
