Video surveillance system

Abstract

A video surveillance system wherein a monitoring station collects video data obtained by a monitoring camera is disclosed. The system includes a multihop wireless network formed of a plurality of wireless nodes including a first wireless node having the monitoring camera, and a second wireless node having a gateway connected to the monitoring station. The system also includes a priority control device configured to control the wireless network so that transmission in a link between the first wireless node and the second wireless node is performed at a priority level contained in a priority information message. The transmission including transmitting a video data request from the monitoring station to the monitoring camera, or transmitting video data from the monitoring camera to the monitoring station.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention, and together with the general description given above and the detailed description of the embodiments given below, serve to explain the principles of the invention.

FIG. 1 is a basic configuration diagram of a video surveillance system according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram of a multihop wireless network according to the first embodiment of the present invention;

FIG. 3 is a function block diagram of a wireless node in the first embodiment of the present invention;

FIG. 4 is an operation diagram of a priority information transmission method in the first embodiment of the present invention;

FIG. 5 is an operation diagram of a priority information transmission method in a second embodiment of the present invention;

FIG. 6 is an operation diagram of a priority information transmission method in a third embodiment of the present invention; and

FIG. 7 is an example of a holding information table of each node in the second embodiment of the present invention.

Claims

1. A video surveillance system wherein a monitoring station collects video data obtained by a monitoring camera, comprising: a multihop wireless network formed of a plurality of wireless nodes including a first wireless node having the monitoring camera, and a second wireless node having a gateway connected to the monitoring station; anda priority control device configured to control the wireless network so that transmission in a link between the first wireless node and the second wireless node is performed at a priority level contained in a priority information message, the transmission including transmitting a video data request from the monitoring station to the monitoring camera, or transmitting video data from the monitoring camera to the monitoring station.

2. The system according to claim 1, wherein the priority control device includes a transmission device configured to transmit the priority information message together with the video data request from the gateway.

3. The system according to claim 2, wherein the priority control device includes a restriction device configured to restrict amount of packet communication from wireless nodes which have received the priority information message to wireless nodes on the link.

4. The system according to claim 3, wherein the restriction device restricts amount of packet communication by delaying sending of packets in a predetermined period.

5. The system according to claim 3, wherein the restriction device restricts amount of packet communication by restricting a bandwidth for communication of sending.

6. The system according to claim 2, wherein the priority control device includes a restriction device configured to restrict amount of packet communication from wireless nodes adjacent to the link to wireless nodes on the link, when the wireless nodes adjacent to the link have received the priority information message.

7. The system according to claim 6, wherein the restriction device restricts amount of packet communication by delaying sending of packets in a predetermined period.

8. The system according to claim 6, wherein the restriction device restricts amount of packet communication by restricting a bandwidth for communication of sending.

9. The system according to claim 1, wherein the priority control device includes a transmission device configured to transmit the priority information message contained in a routing message for performing route control for data transmission in the wireless network by a routing protocol.

10. The system according to claim 9, wherein the priority control device includes a restriction device configured to restrict amount of packet communication from wireless nodes which have received the priority information message to wireless nodes on the link.

11. The system according to claim 10, wherein the restriction device restricts amount of packet communication by delaying sending of packets in a predetermined period.

12. The system according to claim 10, wherein the restriction device restricts amount of packet communication by restricting a bandwidth for communication of sending.

13. The system according to claim 9, wherein the priority control device includes a restriction device configured to restrict amount of packet communication from wireless nodes adjacent to the link to wireless nodes on the link, when the wireless nodes adjacent to the link have received the priority information message.

14. The system according to claim 13, wherein the restriction device restricts amount of packet communication by delaying sending of packets in a predetermined period.

15. The system according to claim 13, wherein the restriction device restricts amount of packet communication by restricting a bandwidth for communication of sending.

16. The system according to claim 1, wherein the priority control device includes a transmission device configured to transmit the priority information message together with the video data from the monitoring camera.

17. The system according to claim 16, wherein the priority control device includes a restriction device configured to restrict amount of packet communication from wireless nodes which have received the priority information message to wireless nodes on the link.

18. The system according to claim 17, wherein the restriction device restricts amount of packet communication by delaying sending of packets in a predetermined period.

19. The system according to claim 17, wherein the restriction device restricts amount of packet communication by restricting a bandwidth for communication of sending.

20. The system according to claim 16, wherein the priority control device includes a restriction device configured to restrict amount of packet communication from wireless nodes adjacent to the link to wireless nodes on the link, when the wireless nodes adjacent to the link have received the priority information message.

21. The system according to claim 20, wherein the restriction device restricts amount of packet communication by delaying sending of packets in a predetermined period.

22. The system according to claim 20, wherein the restriction device restricts amount of packet communication by restricting a bandwidth for communication of sending.

23. The system according to claim 1, wherein a routing protocol for performing route control for data transmission in the wireless network is an Optimized Link State Routing (OLSR) protocol.