| 摘要 |
A presence detection system is provided comprising one or more motion detectors, such as a passive infrared sensor (PIR), arranged to determine whether or not an area, such as a room, is occupied by a person, whereby lighting in the room may be switched on or off dependent upon the occupancy of the room. The system is arranged to determine a plurality of properties associated with at least one movement detected by the at least one sensor prior to a period when no motion is detected. This may be representative of movement properties indicative of a person exiting the room. The system may therefore distinguish between an area being unoccupied, and an area being occupied by a stationary occupant, and therefore overcomes the issue with prior art systems that falsely determine an area to be unoccupied as a result of a lack of/little movement by a person still occupying the room.
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