CN115190275A - Network video recorder, video monitoring system and video monitoring method - Google Patents
Network video recorder, video monitoring system and video monitoring method Download PDFInfo
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- CN115190275A CN115190275A CN202210810643.7A CN202210810643A CN115190275A CN 115190275 A CN115190275 A CN 115190275A CN 202210810643 A CN202210810643 A CN 202210810643A CN 115190275 A CN115190275 A CN 115190275A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/76—Television signal recording
Abstract
The application provides a network video recorder, a video monitoring system and a video monitoring method, and the network video recorder comprises: the first wifi module works in an AP mode, is connected with the network camera and receives video data collected by the network camera; the second wifi module works in an STA mode and is used for being connected with gateway equipment, and the received video data collected by the network camera are sent to the cloud end through the gateway equipment so as to solve the problems of complex construction, high cost and poor mobility of the existing video monitoring system.
Description
Technical Field
The application relates to the field of video monitoring, in particular to a network video recorder, a video monitoring system and a video monitoring method.
Background
In recent years, video monitoring systems have been widely applied in the fields of industry, traffic, intelligent residential districts and the like, and the management efficiency and the automation level are greatly improved. The Video monitoring system generally comprises a Network CAMERA (IP CAMERA, IPC), a Network Video Recorder (NVR), a display, and other devices. In the prior art, two mainstream monitoring systems are: the IPC and the NVR are connected by adopting a wired network, and videos collected by the IPC are stored in a hard disk of the NVR; or the IPC and the router store the acquired video in the SD card or the cloud in a wireless connection mode.
However, in the above two monitoring systems, there are the following disadvantages: the IPC and the NVR are connected by adopting a wired network, so that the construction is complex, the cost is higher and the mobility is poorer; the IPC and the router store the acquired video in the SD card or the cloud in a wireless connection mode, the SD is adopted for storage, the storage capacity is limited, and the cloud storage cost is high due to the cloud storage.
Disclosure of Invention
An object of the embodiments of the present application is to provide a network video recorder, a video monitoring system and a video monitoring method, so as to solve the problems of complex construction, high cost and poor mobility of the existing video monitoring system.
In a first aspect, the present invention provides a network video recorder, including: the first wifi module works in an AP mode, is connected with the network camera and receives video data collected by the network camera; the second wifi module works in an STA mode and is used for being connected with the gateway device, and the received video data collected by the network camera is sent to the cloud end through the gateway device.
In the implementation process, a first wifi module is arranged on the network video recorder, works in an AP mode, creates a wireless local area network, is connected with the network camera, and receives video data acquired by the network camera in a wireless communication mode. Compared with the prior art in which the network camera and the network video recorder are connected by adopting a wired network, the problems of complex construction, higher cost and poor mobility of the existing video monitoring system are solved by adopting the mode. The video data collected by the network camera is stored in the network video recorder, and the network camera does not need to be provided with an SD card, so that the problem of limited storage capacity of the SD card is solved, cloud storage is not needed, and the problem of high cloud storage cost is solved. In addition, a second wifi module is arranged and works in an STA (station) mode, the second wifi module is used for being connected with gateway equipment, and the received video data collected by the network camera are sent to the cloud end through the gateway equipment, so that a user can access the network video recorder through the cloud end to obtain the video data collected by the network camera, and the applicability is improved.
In an optional implementation manner, the first wifi module is configured to send first identification information to the network camera, where the first identification information includes a device ID, so that the network camera receives the device ID, and when the device ID is matched with a preset device ID stored in the network camera, the first wifi module establishes a connection with the network video recorder.
In the implementation process, when the network camera is connected with the network video recorder, the legality of the network video recorder is verified in the mode, and the safety of the video monitoring system is improved.
In an optional implementation manner, the first wifi module is configured to send second identification information to the network camera, where the second identification information includes a device ID and a signal strength, so that the network camera receives the device ID and the signal strength, and when the device ID matches a preset device ID stored in the network camera and the signal strength meets a preset condition, the first wifi module establishes a connection with the network video recorder.
In the implementation process, when the network camera is connected with the network video recorder, the network camera and the network video recorder can realize self-networking by the mode.
In an optional implementation manner, the network video recorder further includes a control module, configured to control a target network camera connected to the control module to start a cascading function, so that the target network camera starts a hotspot function, establishes a connection with another network camera, and forwards video data acquired by the other network camera to the network video recorder.
In the implementation process, the network camera has a cascade function, and the connection distance between the network camera and the network video recorder is increased in a multi-stage cascade mode, so that the network camera can cover more areas.
In a second aspect, the present invention provides a video surveillance system, the system comprising: the network camera is used for acquiring video data; the network video recorder is used for receiving the video data collected by the network camera and sending the received video data collected by the network camera to the cloud end through the gateway equipment wirelessly connected with the network video recorder, wherein the network video recorder comprises: the device comprises a first wifi module and a second wifi module; the first wifi module works in an AP mode, is used for being connected with a network camera and receiving video data collected by the network camera; the second wifi module works in an STA mode and is used for being connected with gateway equipment, and the received video data collected by the network camera is sent to a cloud end through the gateway equipment.
In an optional embodiment, the first wifi module is configured to send first identification information to the network camera, where the first identification information includes a device ID; the network camera receives the first identification information and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera; and if the matching is successful, establishing connection with the network video recorder.
In an optional embodiment, the first wifi module is configured to send second identification information to the network camera, where the second identification information includes a device ID and a signal strength; the network camera receives the second identification information, and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera and whether the signal strength meets a preset condition; and if the equipment ID is matched with the preset equipment ID and the signal intensity meets the preset condition, establishing connection with the network video recorder.
In an optional implementation manner, the network video recorder further includes a control module, configured to control a target network camera directly connected to the control module to start a cascade function, so that the target network camera starts a hotspot function, establishes a connection with another network camera, and forwards video data collected by the other network camera to the network video recorder.
In a third aspect, the present invention provides a video monitoring method, including: the network video recorder acquires video data and wirelessly transmits the acquired video data to the network video recorder; the network video recorder receives the video data collected by the network camera and sends the received video data collected by the network camera to a cloud end through a gateway device which is in wireless connection with the network video recorder, wherein the network video recorder comprises: the device comprises a first wifi module and a second wifi module; the first wifi module works in an AP mode, is used for being connected with a network camera and receiving video data collected by the network camera; the second wifi module works in an STA mode and is used for being connected with gateway equipment, and the received video data collected by the network camera is sent to a cloud end through the gateway equipment.
In an alternative embodiment, the network camera and the network video recorder establish a connection by the following steps: the network video recorder sends first identification information to the network camera, wherein the first identification information comprises an equipment ID; the network camera receives the first identification information and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera; and if the matching is successful, establishing connection with the network video recorder.
In an alternative embodiment, the network camera and the network video recorder establish a connection by the following steps: the network video recorder sends first identification information to the network camera, wherein the first identification information comprises equipment ID and signal strength; the network camera receives the first identification information, and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera and whether the signal intensity meets a preset condition; and if the equipment ID is matched with the preset equipment ID and the signal intensity meets the preset condition, establishing connection with the network video recorder.
In an alternative embodiment, the method further comprises: the network camera controls a target network camera connected with the network camera to start a cascading function so that the target network camera starts a hot spot function, establishes connection with other network cameras and forwards video data acquired by other network cameras to the network video recorder.
Drawings
To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a block diagram of a video monitoring system according to an embodiment of the present disclosure;
fig. 2 is a flowchart of a video monitoring method according to an embodiment of the present disclosure.
Icon: 100-video surveillance system; 101-a web camera; 102-network video recorder; 1021-a first wifi module; 1022-a second wifi module.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 1, fig. 1 is a block diagram of a video monitoring system according to an embodiment of the present disclosure. The video surveillance system 100 may include: a network camera 101 and a network video recorder 102.
The network camera 101 is disposed at a monitoring point and is configured to collect video data of the monitoring point. It is understood that the number of the network cameras 101 may be multiple, and the multiple network cameras are respectively arranged at different monitoring points.
The network video recorder 102 is provided with a first wifi module 1021 and a second wifi module 1022.
The first wifi module 1021 works in an AP mode, and is configured to connect with the network camera 101, receive video data acquired by the network camera 101, and store the video data acquired by the network camera 101 in the network video recorder 102.
The first wifi module 1021 works in the AP mode, and is equivalent to a creator of a wireless network, and is a central node of the wireless network. The plurality of network cameras 101 serve as STA terminals, are connected with the first wifi module 1021, and transmit the acquired video data to the network video recorder 102 through the first wifi module 1021.
The first wifi module 1021 starts a hotspot function, generates a wifi user name and a password, and creates a wireless local area network. The plurality of network cameras 101 access the wireless local area network according to the user names and the passwords, and establish wireless connection with the network video recorder 102.
Specifically, the user name of the wireless local area network created by the first wifi module 1021 may be determined according to a preset fixed field and a serial number of the network video recorder 102. For example: the first wifi module 1021 is according to presetting the fixed field: the WIFINVR and serial number of the network video recorder 102 (e.g., ABC) generate the user name: wifinvrabic.
The password generation mode of the wireless local area network is as follows: after the combination of the user name and the preset character string of the wireless local area network is carried out, the calculation is carried out through a preset encryption algorithm (for example, SHA256 encryption algorithm), and then a plurality of character strings at preset positions are intercepted from the calculation result of the encryption algorithm to be used as the password of the wireless local area network.
Further, in order to improve the security of the video monitoring system 100, when the network camera 101 establishes a wireless connection with the first wifi module 1021 of the network video recorder 102, the first wifi module 1021 sends first identification information to the network camera, where the first identification information includes the device ID. After receiving the first identification information, the network camera 101 determines whether the device ID matches a pre-stored preset device ID, and if so, establishes a connection with the network video recorder 102.
In the implementation process, when the network camera 101 and the network video recorder 102 establish a connection, the validity of the network video recorder 102 is verified in the above manner, and the security of the video monitoring system 100 is improved.
Further, in order to enable the video monitoring system 100 to have an ad hoc network function, when the network camera 101 establishes a wireless connection with the first wifi module 1021 of the network video recorder 102, the first wifi module is configured to send second identification information to the network camera, where the second identification information includes a device ID and signal strength. The network camera 101 receives the second identification information, and judges whether the device ID matches a pre-stored preset device ID and whether the signal strength meets a preset condition; and if the equipment ID is matched with the preset equipment ID and the signal intensity meets the preset condition, establishing connection with the network video recorder.
Specifically, the hostapd open source code of the first wifi module 1021 of the network video recorder 102 is modified, and a specific identifier (i.e., the first identification information or the second identification information) is added to the beacon packet sent by the first wifi module 1021. The webcam 101 receives the beacon packet, and analyzes the beacon packet, thereby implementing ad hoc networking of the webcam 101 and the webcam 102.
For example, the first wifi module 1021 of the network video recorder 102 is powered on and starts to work in an AP mode, creates a wireless local area network, and sends a beacon packet carrying the second identification information. After the network video camera 101 is started up and works, surrounding wifi signals are searched, a searching tool based on a NETLINK protocol is adopted to analyze the searched wifi user name and beacon packet, and the matched network video recorder 102 is determined. And then, a wifi password is calculated according to the wifi user name, and wireless connection is established with the network video recorder 102, so that ad hoc networking of the network camera 101 and the network video recorder 102 is realized.
It can be understood that the way of calculating the wifi password by the network camera 101 is the same as the way of generating the wifi password by the first wifi module 1021 of the network video recorder 102, and is not repeated herein for brevity of the description.
After the webcam 101 analyzes the beacon packet, there are the following three cases.
The first condition is as follows: if the network camera 101 is bound with a certain network video recorder 102 in advance (that is, the network camera 101 stores the device ID of a certain network video recorder 102), after the network camera 101 analyzes the beacon packet, it is determined that the device ID of the second identification information matches the device ID of the bound network video recorder 102, and then a connection is directly established with the network video recorder 102.
Case two: if the network camera 101 is not bound with any network video recorder 102 in advance and only one network video recorder 102 exists around the network camera 101, after the beacon packet is analyzed by the network camera 101, the distance between the network camera 101 and the network video recorder 102 is calculated according to the signal intensity in the second identification information, and if the distance meets a preset condition (for example, the distance is less than 10 m), the connection with the network video recorder 102 is established and the binding with the network video recorder 102 is performed, so that the subsequent connection with the network video recorder 102 can be directly performed.
And a third situation: if the network camera 101 is not bound with any network video recorder 102 in advance and a plurality of network video recorders 102 exist around the network camera 101, after the network camera 101 analyzes the beacon packet, the distance between the network camera 101 and the plurality of network video recorders 102 is calculated according to the signal intensity in the second identification information, and the network video recorder 102 corresponding to the distance meeting the preset condition is selected for connection. After the connection, the network camera 101 further determines whether a plurality of network video recorders 102 around the network camera are configured with a distribution network function (beacon packets sent by the network video recorders 102 carry flag information indicating whether the distribution network function is configured with a distribution network field, for example, a distribution network field exists, and when the value of the field is 0, it indicates that the network video recorder 102 is not configured with the distribution network, and when the value of the field is 1, it indicates that the network video recorder 102 is configured with the distribution network). If the network video recorder 102 for starting the distribution network function exists, the network video recorder 101 is bound with the network video recorder 102 for starting the distribution network function.
The preset condition may be that the distance is less than 10m, 15m, etc., and the present application is not limited to this.
Further, in order to improve the coverage of the video monitoring system 100, the network video recorder 102 further includes a control module, configured to control a target network camera connected to the control module to start a cascade function, so that the target network camera starts a hot spot function, establishes a connection with another network camera 101, and forwards video data collected by the other network camera to the network video recorder 102.
Specifically, after one network camera 101 is connected to the network video recorder 102, the network video recorder 102 sends a control instruction to the network camera 101 through the control module, and controls the network camera 101 (for convenience of subsequent description, the network camera is referred to as a target network camera) to operate in the AP mode. If the distance between one to-be-connected network camera and the network video recorder 102 is far and the wifi signal of the network video recorder 102 is weak, if the distance between the to-be-connected network camera and the target network camera is close and the wifi signal of the target network camera is strong, the to-be-connected network camera and the target network camera are connected, and video data collected by the to-be-connected network camera is forwarded to the network video recorder 102 through the target network camera.
It can be understood that, in the embodiment of the present application, the target network camera supports the AP mode.
The second wifi module 1022 operates in STA mode, and has functions of searching surrounding hotspots and connecting hotspots. The network video recorder 102 may be connected to the gateway device through the second wifi module 1022, and send the received video data collected by the network camera 101 to the cloud through the gateway device. The user can access the network video recorder 102 through the cloud via other electronic devices (e.g., a mobile phone, a PC, etc.), and obtain video data collected by the network camera 101.
The first wifi module 1021 and the second wifi module 1022 may be the same USB interface wifi module. The first wifi module 1021 and the second wifi module 1022 may be directly welded to the main control board of the network video recorder 102, or may be connected to the network video recorder 102 in a hot-plug manner, and are plug-and-play.
Due to the working principle of the USB, the two USB interface wifi modules can not work normally because the hardware is the same and conflicts are caused. Therefore, driver and kernel modifications are required. At the drive end, the source code of the wifi driver is modified, resulting in two wifi drivers with two different matching parameters idVendor and idProduct, which are specified at compile time. It can be understood that one USB interface wifi module corresponds to one wifi driver, and idVendor and idProduce of the USB interface wifi module are the same as idVendor and idProduce of the wifi driver corresponding to the USB interface wifi module.
When the USB interface wifi module is inserted into one port of the USB hub, the device configuration and the drive search can be started. The equipment configuration and the drive search are completed in the usb _ new _ device (), and whether compatible equipment is needed or not is judged according to the actual idVendor and idProduct of the hardware equipment (the idVendor and the idProduct obtained by the same hardware are the same). And then determining the physical position of the inserted USB interface wifi module by matching the device port name dev _ name (& udev- > dev), and changing idVendor and idProduct into the values same as the USB interface wifi module according to different physical positions, so that the kernel binds the inserted USB interface wifi module with the preconfigured wifi driving programs of idVendor and idProduct corresponding to the USB interface wifi module, and the two USB interface wifi modules can independently operate.
Further, the network video recorder 102 may further be configured with a wired interface, and the wired interface may be connected to a wired network camera to receive video data collected by the wired network camera. The wired interface may also be connected to a PC device to access the network video recorder 102, to obtain video data stored on the network video recorder 102, or to manage a network video camera connected to the network video recorder 102.
Based on the same inventive concept, the embodiment of the application also provides a video monitoring method. Referring to fig. 2, fig. 2 is a flowchart of a video monitoring method applied to the video monitoring system 100 according to an embodiment of the present disclosure, where the video monitoring method includes:
step S201: the network video camera collects video data and sends the collected video data to the network video recorder in a wireless mode.
Step S202: the network video recorder receives video data collected by the network camera and sends the received video data collected by the network camera to the cloud end through the gateway device which is in wireless connection with the network video recorder.
In an alternative embodiment, the network camera and the network video recorder establish a connection by the following steps: the network video recorder sends first identification information to the network camera, wherein the first identification information comprises an equipment ID; the network camera receives the first identification information and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera; and if the matching is successful, establishing connection with the network video recorder.
In an alternative embodiment, the network camera and the network video recorder establish a connection by the following steps: the network video recorder sends first identification information to the network camera, wherein the first identification information comprises equipment ID and signal strength; the network camera receives the first identification information, and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera and whether the signal intensity meets a preset condition; and if the equipment ID is matched with the preset equipment ID and the signal intensity meets the preset condition, establishing connection with the network video recorder.
In an alternative embodiment, the method further comprises: the network camera controls a target network camera connected with the network camera to start a cascading function so that the target network camera starts a hot spot function, establishes connection with other network cameras and forwards video data acquired by other network cameras to the network video recorder.
It can be understood that the video monitoring method applied to the video monitoring system 100 provided by the present application corresponds to the interaction between the network camera 101 and the network video recorder 102, and for brevity of the description, the same or similar parts may be referred to each other, and are not described herein again.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions when actually implemented, and for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of devices or units through some communication interfaces, and may be in an electrical, mechanical or other form.
In addition, units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.
It should be noted that, if the functions are implemented in the form of software functional modules and sold or used as independent products, the functions may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A network video recorder, comprising:
the first wifi module works in an AP mode, is connected with the network camera and is used for receiving video data collected by the network camera;
the second wifi module works in an STA mode and is used for being connected with the gateway device, and the gateway device sends the received video data collected by the network camera to the cloud.
2. The network video recorder of claim 2, wherein the first wifi module is configured to send first identification information to the network camera, the first identification information includes a device ID, so that the network camera receives the device ID, and when the device ID matches a preset device ID stored in the network camera, the network video recorder establishes a connection with the network video recorder.
3. The network video recorder of claim 1, wherein the first wifi module is configured to send second identification information to the network camera, the second identification information includes a device ID and a signal strength, so that the network camera receives the device ID and the signal strength, and when the device ID matches a preset device ID stored in the network camera and the signal strength meets a preset condition, the network video recorder establishes a connection with the network video recorder.
4. The network video recorder of claim 1, further comprising a control module, configured to control a target webcam connected to the network video recorder to start a cascading function, so that the target webcam starts a hot spot function, establishes a connection with another webcam, and forwards video data collected by the other webcam to the network video recorder.
5. A video surveillance system, the system comprising:
the network camera is used for acquiring video data;
the network video recorder is used for receiving the video data collected by the network camera and sending the received video data collected by the network camera to the cloud end through the gateway equipment wirelessly connected with the network video recorder, wherein the network video recorder comprises: the first wifi module and the second wifi module; the first wifi module works in an AP mode, is used for being connected with a network camera and receives video data collected by the network camera; the second wifi module works in an STA mode and is used for being connected with gateway equipment, and the received video data collected by the network camera is sent to a cloud end through the gateway equipment.
6. The video monitoring system of claim 5, wherein the first wifi module is configured to send first identification information to the webcam, the first identification information including a device ID;
the network camera receives the first identification information and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera;
and if the matching is carried out, establishing connection with the network video recorder.
7. The video monitoring system of claim 5, wherein the first wifi module is configured to send second identification information to the webcam, the second identification information including a device ID and a signal strength;
the network camera receives the second identification information, and judges whether the equipment ID is matched with a preset equipment ID stored in the network camera and whether the signal strength meets a preset condition;
and if the equipment ID is matched with the preset equipment ID and the signal strength meets the preset condition, establishing connection with the network video recorder.
8. The video monitoring system according to claim 5, wherein the network video recorder further comprises a control module, configured to control a target network camera directly connected to the network video recorder to start a cascade function, so that the target network camera starts a hotspot function, establishes a connection with another network camera, and forwards video data collected by the other network camera to the network video recorder.
9. A video surveillance method, the method comprising:
the network video camera collects video data and wirelessly transmits the collected video data to the network video recorder;
the network video recorder receives the video data collected by the network camera and sends the received video data collected by the network camera to a cloud end through a gateway device which is in wireless connection with the network video recorder, wherein the network video recorder comprises: the device comprises a first wifi module and a second wifi module; the first wifi module works in an AP mode, is used for being connected with a network camera and receives video data collected by the network camera; the second wifi module works in an STA mode and is used for being connected with gateway equipment, and the received video data collected by the network camera is sent to a cloud end through the gateway equipment.
10. The method of claim 9, further comprising:
the network camera controls a target network camera connected with the network camera to start a cascading function so that the target network camera starts a hot spot function, establishes connection with other network cameras and forwards video data acquired by other network cameras to the network video recorder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210810643.7A CN115190275A (en) | 2022-07-11 | 2022-07-11 | Network video recorder, video monitoring system and video monitoring method |
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| CN202210810643.7A CN115190275A (en) | 2022-07-11 | 2022-07-11 | Network video recorder, video monitoring system and video monitoring method |
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