JP2007329627A - Video monitoring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a video monitoring system that has the effect of improvement in installation by a wireless network connection between a monitoring node and a center device and tolerance to a decrease in transmission quality and trouble inevitable in case of wireless transmission, and can distribute an image of a child of a user photographed by a camera of a monitoring node to a terminal. <P>SOLUTION: Wireless LAN devices 3 are introduced in the center device 2 and monitoring node 5 to secure a wireless LAN circuits 9 in addition to a wired LAN 8, and while a monitoring node 10 is installed, a network management device 4 is provided. The network management device 4 holds the state of wireless communication between the center device 2 and monitoring node 10, and the current state and history of wireless LAN channels, and if trouble is detected, temporary trouble and persistent trouble are discriminated to suitably vary operation parameters of the wireless LAN devices 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a video surveillance system that distributes an image captured by a camera according to an instruction from a terminal via a wired LAN or a wireless LAN network.

As shown in FIGS. 7 and 8, a conventional video monitoring system is composed of a monitoring device having cameras installed at a plurality of locations and a center device that provides a camera image to a user via the Internet. The user connects to the center device and obtains an image through the camera of the monitoring device (see, for example, Patent Document 1).
JP 2001-339708 A

  However, in the conventional video surveillance system, the connection between the monitoring device including the camera and the center device is a wired LAN, and there is a problem that the video surveillance system cannot be operated in a monitoring location where it is difficult to construct the wired LAN.

  The present invention has been made in order to solve the conventional problems. By introducing a wireless LAN between the monitoring device and the center device, the installation of the monitoring location is improved, and for troubles such as line disconnection unique to the wireless LAN. It is an object of the present invention to provide a video surveillance system that can save maintenance work by automatically avoiding the problem.

  The video monitoring system of the present invention is installed in a plurality of locations, connected to a camera device that captures a monitoring target, a monitoring node that includes a control device that controls the camera device, and the monitoring node via the Internet, A center device that receives image data captured by a camera device of the monitoring node and transmits the image data to a user terminal connected via a network, the network connection between the monitoring node and the center device A network management device that manages the network, a WEB server that provides an I / F for user browsing and camera control, a data server that stores user registration information, past image data, and the operating status of the system, A router for connecting to the monitoring node via the Internet, and the network management device is particularly wireless Grasp the communication status of the connected the monitoring node and the center apparatus by AN, has a configuration in which the video monitoring system, characterized in that to change the operation settings of the wireless LAN if necessary.

  With this configuration, it is possible to install a monitoring node using a wireless LAN while maintaining the basic function of the monitoring system. In the network management device, the network status of the monitoring system, for example, between the monitoring device and each monitoring node Current status and past history of periodic communication confirmation by PING, in the case of a wireless LAN monitoring node, the status and past history of the reception level of the wireless LAN device, and the current status and past of network communication error status of each monitoring node If a failure occurs, the network management device can instruct to change the connection path between the center device and the monitoring device in the case of a wired LAN. In the case of a LAN, by instructing to change the operation settings of the wireless LAN, it is avoided as much as possible from the failure. Rukoto can.

The video surveillance system of the present invention is the video surveillance system according to claim 1, wherein the network management device is provided with a wireless LAN monitor device for detecting a radio wave condition, and the wireless LA monitor is provided.
It has a configuration as a video monitoring system in which radio wave status information detected by an N monitor device is obtained, and the network management device selects and changes an optimal wireless LAN operation setting.

  With this configuration, in the event of a communication failure with a monitoring node using a wireless LAN, it is possible to grasp the radio wave condition near the radio frequency to be used, as well as to know the usage status of all channels used by the wireless LAN. Is a temporary failure due to the passage of a physical obstacle, etc., or a continuous failure due to the appearance of a wireless station that affects the wireless LAN used in this system. Thus, it can be determined whether or not the operation setting of the wireless LAN should be changed.

  The present invention makes it possible to install a monitoring node by a wireless LAN while maintaining the basic function as a monitoring system. In the network management device, the network status of the monitoring system, for example, between the network management device and each monitoring node can be set. Current status and past history of periodic communication confirmation by PING, in the case of a wireless LAN monitoring node, the status and past history of the reception level of the wireless LAN device, and the current status and past of network communication error status of each monitoring node If a failure occurs, the network management device can instruct to change the connection path between the center device and the monitoring device in the case of a wired LAN. In the case of a LAN, an instruction to change the operation settings of the wireless LAN can be used to avoid the failure as far as possible. It is capable of providing a video surveillance system which has the effect that it is.

Hereinafter, a video surveillance system according to an embodiment of the present invention will be described with reference to the drawings.
(First embodiment)

  A video surveillance system according to a first embodiment of the present invention is shown in FIGS. 1 and 2A. In FIG. 1, when a user 1 monitors a child 7, a monitoring node 5 and a camera 6 connected by a wired LAN 8 from the center device 2 and a monitoring node 10 and a camera wirelessly connected by a wireless LAN device 3 are monitored. Monitor at 11 or 12.

  2A, in the video monitoring system according to the present embodiment, when a user 201 monitors a child 202 with a personal computer 203 or a mobile phone 204, wired LAN monitoring nodes 310 and 310 including a camera server 311 and a camera 312 are provided. The wireless LAN monitoring node 320 to which the wireless LAN device 327 is connected and the center 100 which is the center of the monitoring system are connected to the Internet 110 by the router 101, and the center is connected to the WEB server 103 and the data server 104 by the HUB 102. , A wireless LAN device 105 and a network management device 106 are configured for a wireless LAN.

  The operation of the video surveillance system configured as described above will be described with reference to FIGS.

First, in the operation as a basic monitoring system, a user connects to the WEB server 103 as shown in the operation flow of FIG. User information is registered in the data server 104, and a logged-in person can be confirmed. If there is no problem for the user, access to the camera server 311 where the child is present is permitted, and the camera server 311 is connected via the network via the WEB server 103. Since only one person can operate the camera 312 at the same time, the camera server 311 performs simple control right control. The control right is acquired when the camera control is performed, the control right is returned after the end of the control, and the camera cannot be controlled until another user releases the control right. After that, if there is a logout request, the connection between the user and the monitoring system is disconnected.

  On the other hand, in the network management device 106, the communication status between the wireless LAN device 105 and the wireless LAN device 327 is changed to the wireless status (used channel, wireless modulation method, maximum connection speed, maximum retransmission) of each site as shown in the operation flow of FIG. Frequency, transmission power, reception sensitivity, packet loss rate, data error rate, etc.) are periodically acquired, such as every minute, and the current wireless status and past wireless status are stored in the network management device. For example, when the communication status NG and the network management apparatus determine that the communication status exceeds 10% when the packet loss rate exceeds 10%, the setting is changed to an appropriate setting. For example, the network management apparatus performs processing as much as possible in a communication state specified in advance, such as increasing the transmission power, increasing the maximum number of retransmissions, decreasing the maximum connection speed, changing the wireless modulation method, and changing the channel used.

According to the video monitoring system of the first embodiment of the present invention as described above, by providing a network management device in addition to the wireless LAN device, the network connection between the monitoring node and the center is made wireless, and the installation property is improved. In addition, in the case of a wireless LAN, it is possible to obtain an effect of enhancing the resistance against a deterioration in transmission quality and a failure that cannot be avoided.
(Second Embodiment)

  Next, a video surveillance system according to a second embodiment of the present invention is shown in FIG. 2B. In FIG. 2B, a wireless LAN monitor device 107 having a function of checking the wireless status is added to the first embodiment of the present invention shown in FIG. 2A.

  The operation of the video surveillance system configured as described above will be described with reference to FIGS. 3, 4, 5 and 6.

  First, in the operation as the actual monitoring system, a user connects to the WEB server 103 as in the operation flow of FIG. User information is registered in the data server 104, and a logged-in person can be confirmed. If there is no problem for the user, access to the camera server 311 where the child is present is permitted, and the camera server 311 is connected via the network via the WEB server 103. Since only one person can operate the camera 312 at the same time, the camera server 311 performs simple control right control. The control right is acquired when the camera control is performed, the control right is returned after the end of the control, and the camera cannot be controlled until another user releases the control right. After that, if there is a logout request, the connection between the user and the monitoring system is disconnected.

  On the other hand, in the network management device 106, the communication status between the wireless LAN device 105 and the wireless LAN device 327 is changed to the wireless status (used channel, wireless modulation method, maximum connection speed, maximum retransmission) of each site as shown in the operation flow of FIG. Frequency, transmission power, reception sensitivity, packet loss rate, data error rate, etc.) are periodically acquired, such as every minute, and the current wireless status and past wireless status are stored in the network management device.

  Also, the wireless LAN monitor device periodically collects the surrounding wireless LAN usage status, and for example, grasps and accumulates the reception level for each wireless LAN channel as shown in FIG. For example, when the communication status NG and the network management apparatus determine that the communication status exceeds 10% when the packet loss rate exceeds 10%, the setting is changed to an appropriate setting. For example, the network management apparatus performs processing as much as possible in a communication state specified in advance, such as increasing the transmission power, increasing the maximum number of retransmissions, decreasing the maximum connection speed, changing the wireless modulation method, and changing the channel used.

At this time, the network management device determines the processing contents by associating the information of the wireless LAN monitor device with the wireless status data held by the network management device. If the reception level is constant and the packet loss rate is high when the past packet loss rate is not high, it is a propagation failure due to a temporary obstacle and no channel change is required. However, if a high-level wireless station not found in the past can be confirmed in the nearby wireless LAN channel, it is necessary to change the wireless LAN channel. In making the change, the average reception level of the corresponding channel and the upper and lower three channels is calculated from the current wireless LAN channel state of FIG. 5, and the lowest channel based on the average reception level as shown in the line graph of FIG. Is preferably selected.

  As described above, according to the video monitoring system of the second embodiment of the present invention, the wireless LAN monitor device 107 is provided in the video monitoring system of the first embodiment of the present invention, so that the most when changing the wireless LAN channel. A good choice can be made and it can be determined whether the fault is a temporary fault or a fault that requires change.

  In the above description, the example in which the line graph of FIG. 6 is configured with the average value of the corresponding channel and the upper and lower three channels has been described, but other calculation methods, for example, the sum value can be similarly implemented.

  As described above, the video monitoring system according to the present invention provides a network management device in addition to a wireless LAN device, thereby making wireless the network connection between the monitoring node and the center and improving the installation property. As an image monitoring system or the like that has the effect of being able to enhance the resistance to deterioration of transmission quality and failures that cannot be avoided in the case of, and distributing images taken by a camera according to instructions from a terminal via a wired LAN or a wireless LAN network Useful.

Representative block diagram of video surveillance system of the present invention The block diagram of the video surveillance system in 1st Embodiment of this invention. The block diagram of the video surveillance system in 2nd Embodiment of this invention The flowchart for operation | movement description of the video surveillance system in 1st Embodiment of this invention. The flowchart for operation | movement description of the video surveillance system in 1st Embodiment and 2nd Embodiment of this invention Graph showing the operation of the video surveillance system in the second embodiment Graph showing the operation of the video surveillance system in the second embodiment Explanatory drawing showing an example of a conventional video surveillance system Explanatory drawing showing an example of a conventional video surveillance system

Explanation of symbols

100 Monitoring Center 101 Router device connected to the Internet 102 HUB
DESCRIPTION OF SYMBOLS 103 WEB server 104 Data server 105 Center wireless LAN apparatus 106 Network management apparatus 107 Wireless LAN monitor apparatus 110 Internet 200 User environment 201 User 202 Child 203 Personal computer 204 Mobile phone 310 Wired LAN use monitoring node 311 Camera server 312 Monitoring camera 320 Monitoring Node Using Wireless LAN 327 Monitoring Node Wireless LAN Device

Claims (2)

Camera devices installed at multiple locations and shooting the monitoring target;
A monitoring node comprising a control device for controlling the camera device;
A center device connected to the monitoring node via the Internet, receiving image data taken by the camera device of the monitoring node, and transmitting the image data to a user terminal connected via a network; ,
A network management device for managing a network connection between the monitoring node and the center device;
A WEB server that provides an I / F for the user to browse and control the camera;
A data server that stores user registration information, past image data, and the operating status of this system;
A router for connecting to the monitoring node via the Internet;
The video management system characterized in that the network management device comprises a communication status between the monitoring node connected to the center device and the center device, and changes the operation settings of the wireless LAN as necessary. The video surveillance system according to claim 1,
The network management device includes a wireless LAN monitor device that detects a radio wave condition, obtains radio wave status information detected by the wireless LAN monitor device, and the network management device selects and changes an optimal wireless LAN operation setting. A video surveillance system characterized by that.

Images