Network video recorder, video monitoring system and video monitoring method

Abstract

The application provides a network video recorder, a video monitoring system and a video monitoring method. The network video recorder comprises a first 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; and a second WIFI module, the second WIFI module works in an STA mode, is used for being connected with a gateway device, and transmits the received video data collected by the network camera to a cloud through the gateway device, so as to solve the problems of complex construction, high cost and poor mobility of the existing video monitoring system.

Description

TECHNICAL FIELD

[0001] The present 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

[0002] In recent years, video monitoring systems have been widely used in the fields of industry, transportation, intelligent residential areas and the like, and have greatly improved the management efficiency and the automation level. The video monitoring system is generally composed of an IP camera (IPC), a network video recorder (NVR), a display and the like. In the prior art, the two mainstream monitoring systems are as follows: a wired network is used to connect between the IPC and the NVR, and the video collected by the IPC is stored in the hard disk of the NVR; or the IPC and the router are connected through a wireless connection mode, and the collected video is stored in an SD card or a cloud.

[0003] However, in the above two monitoring systems, the following disadvantages exist: the wired network is used to connect between the IPC and the NVR, and the construction is complex, the cost is high and the mobility is poor; the IPC and the router are connected through a wireless connection mode, and the collected video is stored in an SD card or a cloud, and the storage capacity is limited when the SD is used for storage, and the cloud storage cost is high when the cloud is used for storage. SUMMARY

[0004] The purpose 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 existing in the prior art video monitoring system.

[0005] In a first aspect, the present application provides a network video recorder, comprising: a first wifi module, the first wifi module works in an AP mode, is used for connecting with an IP camera, and receives video data collected by the IP camera; a second wifi module, the second wifi module works in an STA mode, is used for connecting with a gateway device, and sends the received video data collected by the IP camera to a cloud through the gateway device.

[0006] In the implementation process, the first wifi module is arranged on the network video recorder, and the first wifi module works in an AP mode, creates a wireless local area network, and is connected with the network camera to receive the video data collected by the network camera through wireless communication. Compared with the prior art in which the network camera and the network video recorder are connected through a wired network, the above method solves the problems of complex construction, high cost and poor mobility of the existing video monitoring system. The video data collected by the network camera is saved in the network video recorder, and the network camera does not need to be provided with an SD card, thereby solving the problem of limited storage capacity of the SD card, and cloud storage is not needed, thereby solving the problem of high cloud storage cost. In addition, the second wifi module is arranged, and the second wifi module works in an STA mode and is used to be connected with a gateway device, and the video data collected by the network camera received by the gateway device is sent to the cloud, so that the user can access the network video recorder through the cloud to obtain the video data collected by the network camera, and the applicability is improved.

[0007] In an optional implementation, the first wifi module is configured to send first identification information to the network camera, the first identification information including a device ID, so that the network camera receives the device ID, and when the device ID matches a preset device ID saved in the network camera, the network video recorder is connected.

[0008] In the implementation process, when the network camera is connected with the network video recorder, the legality of the network video recorder is verified through the above method, and the security of the video monitoring system is improved.

[0009] In an optional implementation, the first wifi module is configured to send second identification information to the network camera, the second identification information including 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 saved in the network camera and the signal strength meets a preset condition, the network video recorder is connected.

[0010] 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 through the above method.

[0011] In an optional implementation, the network video recorder further includes a control module configured to control a target network camera connected with the network video recorder to start a cascading function, so that the target network camera starts a hotspot function, is connected with other network cameras, and forwards video data collected by the other network cameras to the network video recorder.

[0012] In the implementation process, the network camera has a cascading function, and through multi-stage cascading, the connection distance of the network camera and the network video recorder is improved, so that the network camera can cover more areas.

[0013] In a second aspect, the application provides a video monitoring system, comprising: a network camera configured to collect video data; a network video recorder configured to receive the video data collected by the network camera and send the received video data collected by the network camera to the cloud through a gateway device wirelessly connected to the network video recorder, wherein the network video recorder comprises: a first wifi module and a second wifi module; the first wifi module works in AP mode and is configured to connect with the network camera and receive the video data collected by the network camera; the second wifi module works in STA mode and is configured to connect with the gateway device and send the received video data collected by the network camera to the cloud through the gateway device.

[0014] In an optional embodiment, the first wifi module is configured to send first identification information to the network camera, the first identification information comprising a device ID; the network camera receives the first identification information and judges whether the device ID matches a preset device ID saved in the network camera; if the device ID matches the preset device ID, a connection is established with the network video recorder.

[0015] In an optional embodiment, the first wifi module is configured to send second identification information to the network camera, the second identification information comprising a device ID and a signal strength; the network camera receives the second identification information and judges whether the device ID matches a preset device ID saved in the network camera and whether the signal strength meets a preset condition; if the device ID matches the preset device ID and the signal strength meets the preset condition, a connection is established with the network video recorder.

[0016] In an optional embodiment, the network video recorder further comprises a control module configured to control a target network camera directly connected to the network video recorder to turn on a cascading function, so that the target network camera turns on a hotspot function, establishes a connection with other network cameras, and forwards video data collected by the other network cameras to the network video recorder.

[0017] In a third aspect, the present application provides a video monitoring method, which comprises: a network camera collecting video data and sending the collected video data to a network video recorder through wireless transmission; the network video recorder receiving the video data collected by the network camera and sending the received video data collected by the network camera to the cloud through a gateway device connected with the network video recorder, wherein the network video recorder comprises a first wifi module and a second wifi module; the first wifi module works in an AP mode, is used to connect with the network camera and receive the video data collected by the network camera; and the second wifi module works in an STA mode, is used to connect with the gateway device and send the received video data collected by the network camera to the cloud through the gateway device.

[0018] In an optional embodiment, the network camera and the network video recorder establish a connection through the following steps: the network video recorder sends first identification information to the network camera, the first identification information comprising a device ID; the network camera receives the first identification information, judges whether the device ID matches a preset device ID saved in the network camera; and if the device ID matches the preset device ID, a connection is established with the network video recorder.

[0019] In an optional embodiment, the network camera and the network video recorder establish a connection through the following steps: the network video recorder sends first identification information to the network camera, the first identification information comprising a device ID and a signal strength; the network camera receives the first identification information, judges whether the device ID matches a preset device ID saved in the network camera and whether the signal strength meets a preset condition; and if the device ID matches the preset device ID and the signal strength meets the preset condition, a connection is established with the network video recorder.

[0020] In an optional embodiment, the method further comprises: the network camera controlling a target network camera connected with the network camera to start a cascading function, so that the target network camera starts a hotspot function, establishes a connection with other network cameras and forwards video data collected by the other network cameras to the network video recorder. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope, and for those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0022] Figure 1 A structural block diagram of a video monitoring system provided by an embodiment of the present application is shown in FIG. 1.

[0023] Figure 2 A flowchart of a video monitoring method provided by an embodiment of the present application is shown in FIG. 2.

[0024] Icon: 100 - video monitoring system; 101 - network camera; 102 - network video recorder; 1021 - first wifi module; 1022 - second wifi module. DETAILED DESCRIPTION

[0025] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0026] Please refer to Figure 1 , Figure 1 A structural block diagram of a video monitoring system provided by an embodiment of the present application is shown in FIG. 1. The video monitoring system 100 can include a network camera 101 and a network video recorder 102.

[0027] The network camera 101 is arranged at a monitoring point and is used to collect video data of the monitoring point. It can be understood that the number of network cameras 101 can be multiple and arranged at different monitoring points.

[0028] The network video recorder 102 is provided with a first wifi module 1021 and a second wifi module 1022.

[0029] The first wifi module 1021 works in AP mode and is used to connect with the network camera 101, receive the video data collected by the network camera 101, and store the video data collected by the network camera 101 in the network video recorder 102.

[0030] The first wifi module 1021 works in AP mode and is equivalent to a creator of a wireless network and is a central node of the wireless network. Multiple network cameras 101 work as STA ends and establish a connection with the first wifi module 1021, and transmit the collected video data to the network video recorder 102 through the first wifi module 1021.

[0031] The first wifi module 1021 opens a hotspot function, generates a wifi username and password, and creates a wireless local area network. Multiple network cameras 101 access the wireless local area network according to the username and password and establish a wireless connection with the network video recorder 102.

[0032] Specifically, the username of the wireless local area network created by the first wifi module 1021 can be determined according to a preset fixed field and the serial number of the network video recorder 102. For example, the first wifi module 1021 generates the username WIFINVRABC according to the preset fixed field WIFINVR and the serial number (for example, ABC) of the network video recorder 102.

[0033] The password of the wireless local area network is generated in the following manner: after the username of the wireless local area network and a preset string are combined, the preset encryption algorithm (for example, SHA256 encryption algorithm) is used to calculate, and then a plurality of strings at a preset position in the calculation result of the encryption algorithm are intercepted as the password of the wireless local area network.

[0034] Further, in order to improve the security of the video monitoring system 100, when the wireless connection between the network camera 101 and the first wifi module 1021 of the network video recorder 102 is established, the first wifi module 1021 sends the first identification information to the network camera, and the first identification information includes the device ID. After the network camera 101 receives the first identification information, it is judged whether the device ID matches the preset device ID saved in advance, and if it matches, the connection with the network video recorder 102 is established.

[0035] In the above implementation process, when the network camera 101 and the network video recorder 102 are connected, the legality of the network video recorder 102 is verified by the above-mentioned method, and the security of the video monitoring system 100 is improved.

[0036] Further, in order to make the video monitoring system 100 have the function of self-organizing network, when the wireless connection between the network camera 101 and the first wifi module 1021 of the network video recorder 102 is established, the first wifi module is used to send the second identification information to the network camera, and the second identification information includes the device ID and the signal strength. After the network camera 101 receives the second identification information, it is judged whether the device ID matches the preset device ID saved in advance and whether the signal strength meets the preset condition; if the device ID matches the preset device ID and the signal strength meets the preset condition, the connection with the network video recorder is established.

[0037] 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 mentioned above) is added to the beacon packet sent by the first wifi module 1021. The network camera 101 receives the beacon packet and analyzes the beacon packet, thereby realizing the self-organizing network of the network camera 101 and the network video recorder 102.

[0038] For example, the first wifi module 1021 of the network video recorder 102 starts working in AP mode to create a wireless local area network and sends a beacon packet carrying second identification information. After the network camera 101 starts working, it searches for the wifi signal around it, uses a search tool based on the NETLINK protocol to analyze the wifi username and the beacon packet searched, determines the matching network video recorder 102, calculates the wifi password according to the wifi username, establishes a wireless connection with the network video recorder 102, and thus realizes the ad hoc network of the network camera 101 and the network video recorder 102.

[0039] It can be understood that the network camera 101 calculates the wifi password in the same way as the first wifi module 1021 of the network video recorder 102 generates the wifi password, and thus the description is not repeated here for the sake of brevity.

[0040] After the network camera 101 analyzes the beacon packet, there are three cases.

[0041] Case one: if the network camera 101 is previously bound to a network video recorder 102 (i.e., the network camera 101 stores the device ID of the network video recorder 102), when the network camera 101 analyzes the beacon packet, it determines that the device ID of the second identification information matches the device ID of the bound network video recorder 102, and then directly establishes a connection with the network video recorder 102.

[0042] Case two: if the network camera 101 is not previously bound to any network video recorder 102 and there is only one network video recorder 102 around the network camera 101, when the network camera 101 analyzes the beacon packet, it calculates the distance between the network camera 101 and the network video recorder 102 according to the signal strength in the second identification information, and if the distance meets the preset condition (e.g., the distance is less than 10 m), it establishes a connection with the network video recorder 102 and binds to the network video recorder 102, so that it can directly connect to the network video recorder 102 in the future.

[0043] Case three: if the network camera 101 is not bound with any network video recorder 102 in advance and there are multiple network video recorders 102 around the network camera 101, when the network camera 101 parses the beacon packet, the distances between the network camera 101 and the multiple network video recorders 102 are calculated according to the signal strength in the second identification information, and the network video recorder 102 corresponding to the distance satisfying the preset condition is selected to be connected. After the connection, the network camera 101 further judges whether the multiple network video recorders 102 around the network camera 101 are opened for network configuration (the beacon packet sent by the network video recorder 102 carries flag information representing whether the network video recorder 102 is opened for network configuration, for example, there is a network configuration field, when the value of the field is 0, it means that the network video recorder 102 is not opened for network configuration; when the value of the field is 1, it means that the network video recorder 102 is opened for network configuration). If there is a network video recorder 102 opened for network configuration, the network camera 101 is bound with the network video recorder 102 opened for network configuration.

[0044] It should be noted that the preset condition can be less than 10m, 15m, etc., which is not limited in the present application.

[0045] Further, in order to improve the coverage range of the video monitoring system 100, the network video recorder 102 further comprises a control module for controlling the target network camera connected with itself to open the cascade function, so that the target network camera opens the hot spot function, establishes connection with other network cameras 101, and forwards the video data collected by other network cameras to the network video recorder 102.

[0046] Specifically, when a network camera 101 is connected with the network video recorder 102, the network video recorder 102 sends a control instruction to the network camera 101 through the control module to control the network camera 101 (for the convenience of subsequent description, the network camera is referred to as the target network camera) to work in AP mode. When a network camera to be connected is far away from the network video recorder 102 and the wifi signal of the network video recorder 102 is weak, if the network camera to be connected is close to the target network camera and the wifi signal of the target network camera is strong, the network camera to be connected establishes connection with the target network camera, and the video data collected by the network camera to be connected is forwarded to the network video recorder 102 through the target network camera.

[0047] It can be understood that in the embodiment of the present application, the target network camera supports AP mode.

[0048] The second wifi module 1022 works in the STA mode and has the functions of searching for surrounding hotspots and connecting to the hotspots. The network video recorder 102 can be connected with the gateway device through the second wifi module 1022, and the video data collected by the network camera 101 is sent to the cloud through the gateway device. The user can access the network video recorder 102 through the cloud by using other electronic devices (such as a mobile phone, a PC, etc.), and obtain the video data collected by the network camera 101.

[0049] The first wifi module 1021 and the second wifi module 1022 can be the same USB interface wifi module. The first wifi module 1021 and the second wifi module 1022 can be directly welded on the main control board of the network video recorder 102, or can be connected with the network video recorder 102 in the form of hot plug and used immediately after being plugged in.

[0050] Due to the working principle of the USB, the two USB interface wifi modules will conflict due to the same hardware and cannot work normally. Therefore, the driver and the kernel need to be modified. In the driver end, the source code of the wifi driver program is modified to generate two wifi driver programs, and the two driver programs have two different matching parameters idVendor and idProduct, which are specified during compilation. It can be understood that one USB interface wifi module corresponds to one wifi driver program, and the idVendor and idProduct of the USB interface wifi module are the same as the idVendor and idProduct of the corresponding wifi driver program.

[0051] When the USB interface wifi module is inserted into a port of the USB hub, the device will be configured and the driver will be found. The device configuration and driver searching are completed in usb_new_device(), at this time, whether the compatible device (the same hardware obtains the same idVendor and idProduct) is needed is judged according to the actual idVendor and idProduct of the hardware device. Then the physical position of the inserted USB interface wifi module is determined by matching the device port name dev_name(&udev->dev), and the idVendor and idProduct are changed to the same value as the USB interface wifi module according to the different physical position, so that the kernel binds the inserted USB interface wifi module with the pre-configured wifi driver program corresponding to the idVendor and idProduct of the USB interface wifi module, so that the two USB interface wifi modules run independently.

[0052] Further, the network video recorder 102 can also be configured with a wired interface. The wired interface can be connected with the wired network camera to receive the video data collected by the wired network camera. The wired interface can also be connected with a PC device to access the network video recorder 102, to obtain the video data stored in the network video recorder 102 or to manage the network camera connected with the network video recorder 102.

[0053] Based on the same inventive concept, the present application also provides a video monitoring method. Please refer to Figure 2 , Figure 2 A flowchart of a video monitoring method provided by the present application is shown in FIG. 2. The video monitoring method is applied to the video monitoring system 100 described above. The video monitoring method can include the following steps:

[0054] Step S201: The network camera collects video data and transmits the collected video data to the network video recorder wirelessly.

[0055] Step S202: The network video recorder receives the video data collected by the network camera and transmits the received video data to the cloud through the gateway device wirelessly connected with the network video recorder.

[0056] In an optional embodiment, the network camera and the network video recorder establish a connection through the following steps: the network video recorder sends first identification information to the network camera, the first identification information including a device ID; the network camera receives the first identification information and judges whether the device ID matches a preset device ID saved in the network camera; and if the device ID matches the preset device ID, a connection is established with the network video recorder.

[0057] In an optional embodiment, the network camera and the network video recorder establish a connection through the following steps: the network video recorder sends first identification information to the network camera, the first identification information including a device ID and a signal strength; the network camera receives the first identification information and judges whether the device ID matches a preset device ID saved in the network camera and whether the signal strength satisfies a preset condition; and if the device ID matches the preset device ID and the signal strength satisfies the preset condition, a connection is established with the network video recorder.

[0058] In an optional embodiment, the method further includes: 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 hotspot function, establishes a connection with other network cameras, and forwards the video data collected by the other network cameras to the network video recorder.

[0059] It can be understood that the video monitoring method applied to the video monitoring system 100 provided in the present application corresponds to the interaction between the network camera 101 and the network video recorder 102, and for the sake of brevity of the description, the same or similar parts can be referred to each other, which will not be described here again.

[0060] In the embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented by other manners. The device embodiments described above are only schematic, for example, the division of the units is only a logical function division, and another division manner can be used in actual implementation, and for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units or components shown or discussed can be indirect coupling or communication connection through some communication interfaces, devices or units, and can be electrical, mechanical or other forms.

[0061] In addition, the units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can 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 present embodiment.

[0062] Further, the function modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0063] It should be noted that if the functions are realized in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that make contributions to the prior art or parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in the embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0064] In this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations.

[0065] The above merely provides an example of the present application, but is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A network video recorder, characterized by The system comprises: A first wifi module, which works in an AP mode, is used to connect with a network camera and receive video data collected by the network camera; A second wifi module, which works in an STA mode, is used to connect with a gateway device and send the received video data collected by the network camera to the cloud through the gateway device; The first wifi module and the second wifi module are the same USB interface wifi modules; After two USB interface wifi modules are inserted, the actual id parameters of the USB interface wifi modules are modified into the id parameters of the corresponding wifi drivers according to the different physical positions of the two USB interface wifi modules, so that the USB interface wifi modules are bound with the corresponding wifi drivers; The two USB interface wifi modules correspond to run two different wifi drivers; The first wifi module is used 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 saved in the network camera and the signal strength meets a preset condition, a connection is established with the network video recorder; The first wifi module and the second wifi module are set in the network video recorder in the form of hot plug.

2. The network video recorder of claim 1, wherein, The network video recorder further comprises a control module, which is used to control a target network camera connected with the network video recorder to start a cascade function, so that the target network camera starts a hotspot function, establishes a connection with other network cameras, and forwards video data collected by the other network cameras to the network video recorder.

3. A video surveillance system characterized by, The system comprises: A network camera, which is used to collect video data; A network video recorder, which is used to receive video data collected by the network camera and send the received video data collected by the network camera to the cloud through a gateway device wirelessly connected with the network video recorder, wherein the network video recorder comprises a first wifi module and a second wifi module; the first wifi module works in an AP mode, is used to connect with a network camera, and receives video data collected by the network camera; the second wifi module works in an STA mode, is used to connect with a gateway device, and sends the received video data collected by the network camera to the cloud through the gateway device; The first wifi module and the second wifi module are the same USB interface wifi modules; after two USB interface wifi modules are inserted, the actual id parameters of the USB interface wifi modules are modified into the id parameters of the corresponding wifi drivers according to the different physical positions of the two USB interface wifi modules, so that the USB interface wifi modules are bound with the corresponding wifi drivers; the two USB interface wifi modules correspond to run two different wifi drivers; The first wifi module is configured to send second identification information to the network camera, and the second identification information includes a device ID and a signal strength. The first wifi module and the second wifi module are arranged in the network video recorder in a hot plug manner.

4. The video surveillance system of claim 3, 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 other network cameras, and forwards video data collected by the other network cameras to the network video recorder.

5. A video monitoring method characterized by, The method comprises: The network camera collects video data and wirelessly sends 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 to the cloud through a gateway device wirelessly connected to the network video recorder. The first wifi module and the second wifi module are the same USB interface wifi modules. The first wifi module is configured to send second identification information to the network camera, and the second identification information includes a device ID and a signal strength. The first wifi module and the second wifi module are arranged in the network video recorder in a hot plug manner.

6. The method of claim 5, wherein, The method further comprises: The network camera controls the target network camera connected with itself to start the cascade function, so that the target network camera starts the hot spot function, establishes connection with other network cameras, and forwards video data collected by the other network cameras to the network video recorder.

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