Patent ID: 9196140
Filing Date: 2015-11-24
Classification: G08B,H04N

Abstract:
1. A first network device comprising: a first Bluetooth device configured to determine respectively identities of second Bluetooth devices within a communication range of the first Bluetooth device based on first Bluetooth signals exchanged between the first Bluetooth device and the second Bluetooth devices, wherein the second Bluetooth devices are implemented respectively in second network devices, and wherein the second network devices are separate from the first network device; and a processor configured to the second Bluetooth devices are within the communication range of the first Bluetooth device when the second Bluetooth devices are within a same room as the first Bluetooth device, the second Bluetooth devices are out of the communication range of the first Bluetooth device when the second Bluetooth devices are in a different room than the first Bluetooth device, the second network devices comprise respective pairs of active shutter 3D glasses, the pairs of active shutter 3D glasses are controlled in accordance with second Bluetooth signals exchanged between the second Bluetooth devices and a third Bluetooth device, the third Bluetooth device is implemented in a third network device separate from the first network device and the second network devices, the third network device is in a second room, and the processor is configured to generate the alarm indication when one of the second Bluetooth devices moves from the second room in which the third Bluetooth device is located to the room in which the first Bluetooth device is located.