CN111157223B - Fault detection method, device and system - Google Patents

Abstract

A device failure detection technology. When no service picture message is sent, a picture message sending device sends an additional picture detection message to a picture message receiving device, thereby maintaining the sending frequency of picture messages and avoiding the picture message. The message sending device does not send any picture message for a long time. The picture message receiving device receives the picture message generated by the picture message sending device. When the picture message receiving device does not receive the picture message within the preset time period, it means that the picture message sending device is faulty and the picture message The message receiving device can issue a fault alarm.

Description

A fault detection method, device and system

technical field

The invention relates to the field of computers, and in particular, to equipment fault detection.

Background technique

Video surveillance has gradually developed from traditional video content to intelligent picture content to better support business applications. In the current era of intelligence, a large number of intelligent snapshots are generated by front-end cameras or back-end analysis platforms, which are widely used in public security, transportation and various industries.

However, how to find out whether the camera is working properly is a difficult problem for both industry standards and industry manufacturers. A current practice is to establish a heartbeat mechanism between the picture sender and the receiver, and the receiver can determine whether the sender is alive by detecting the heartbeat message. The heartbeat mechanism works between most computer devices.

However, the heartbeat mechanism can only perform detection of less functions, such as: detecting that the network channel of both parties is normal, and detecting whether the sender of the heartbeat is down. If you want to detect whether the function of the camera as a picture message generating device related to picture messages is normal, the existing heartbeat mechanism is powerless.

SUMMARY OF THE INVENTION

In a first aspect, an embodiment of the present invention provides a device fault detection method. A picture message receiving device communicates with a picture message sending device. The method includes: the picture message receiving device receives the picture message and sends the picture message sent by the device. The first picture message; the picture message receiving device determines whether it has received the second picture message sent by the picture message sending device within the first time period since receiving the first picture message; When the picture message receiving device does not receive the second picture message, the picture message receiving device sends a fault alarm signal, where the second picture message is a detection picture message.

By applying this solution, the picture message receiving device can find out whether the function related to the picture message of the picture message sending device is faulty.

In a first possible implementation manner of the first aspect, the alarm signal is used to indicate a failure of the picture message generation function of the picture message sending device. The alarm signal in this solution further indicates the specific type of the fault.

In a second possible implementation manner of the first aspect, the detection picture message is an RTP message encapsulated into a TLV data structure, and the fault indicated by the alarm signal includes: a function of constructing the TLV data structure fails; or , the function failure of encapsulating the TLV data structure into the RTP message. The alarm signal in this solution further indicates the specific type of the fault.

In a third possible implementation manner of the first aspect, the detection picture message is an HTTP message encapsulated in a json data structure, and the fault indicated by the alarm signal includes: the function of constructing the json data structure fails; or , the functional failure of encapsulating the json data structure into an HTTP message. The alarm signal in this solution further indicates the specific type of the fault.

In a fourth possible implementation manner of the first aspect, the picture message receiving device stores the service picture in the first picture message; the picture message receiving device discards the data in the second picture message . The solution does not store the content in the detected picture message, which saves storage space.

In a fourth possible implementation manner of the first aspect, the picture message sending device sends the first picture message to the picture message receiving device; when the picture message sending device stops sending the service picture message After the duration of the message reaches a second duration, the picture message sending device sends the fault detection message to the picture message receiving device, where the second duration is less than or equal to the first duration. This solution introduces the steps performed by the picture message sending device.

In a second aspect, the present invention provides a fault detection device, comprising: a receiving module for receiving a first picture message sent by a message sending device; and a processing module for judging after receiving the first picture message , whether the second picture message sent by the picture message sending device is received within the first time period; the alarm module is configured to send out when the judgment result of the processing module is that the second picture message has not been received A fault alarm signal, wherein the second picture message is a detection picture message.

The second aspect has possible implementations similar to the first aspect and various possible implementations of the first aspect, and has corresponding technical effects.

In a third aspect, an embodiment of a device failure detection system is provided. The device failure detection system includes a picture message sending device and a picture message receiving device that communicates with the picture message sending device. The picture message sending device is used to: send a service message carrying a service picture to the picture message receiving device; when the time period for stopping sending the service picture reaches the second time period, continuously send a fault detection message to the picture message receiving device. The picture message receiving device is used, and the time interval between the fault detection messages is less than the second duration; the picture message receiving device is used for: receiving the picture message sent by the picture message sending device. If two picture messages are not received for a period of time, the picture message receiving device sends an alarm signal.

The third aspect has possible implementation manners similar to the first aspect and various possible implementation manners of the first aspect, and has corresponding technical effects.

In a fourth aspect, an embodiment of a storage medium is provided, including computer instructions, which, when the instructions are executed on a picture message receiving device, cause the picture message receiving device to execute the first aspect and each possible implementation of the first aspect way method.

The fourth aspect has possible implementations similar to the first aspect and various possible implementations of the first aspect, and has corresponding technical effects.

In a fifth aspect, an embodiment of a computer program product is provided, which can run on a picture message sending device, characterized in that it includes: an instruction for receiving a first picture message sent by the picture message sending device; an instruction for judging Whether an instruction for a second picture message sent by the picture message sending device is received within a first time period since the first picture message is received; and, for when the second picture message is not received message, the picture message receiving device sends a fault alarm signal, wherein the second picture message is an instruction to detect the picture message.

The fifth aspect has possible implementation manners similar to the first aspect and various possible implementation manners of the first aspect, and has corresponding technical effects.

In a sixth aspect, the present invention also provides an embodiment of a picture message receiving device, where the picture message receiving device includes a processor (optionally, may also include a memory for storing computer instructions), and the processor executes the computer instructions by running the computer instructions. , and perform the steps performed by the picture message receiving device in the foregoing first aspect.

Description of drawings

FIG. 1 is a topology diagram of an embodiment of an image monitoring system.

FIG. 2 is a flowchart of an embodiment of a camera fault detection method.

FIG. 3 is a schematic diagram of an embodiment of the TLV data structure of the present invention.

FIG. 4 is a schematic diagram of an embodiment of the TLV data structure of the present invention.

FIG. 5 is a schematic diagram of an embodiment of the TLV data structure of the present invention.

FIG. 6 is a schematic diagram of an embodiment of the TLV data structure of the present invention.

FIG. 7 is a flow chart of an embodiment of a method for detecting equipment failure performed by a camera.

FIG. 8 is a flow chart of an embodiment of a device failure detection method executed by a storage server.

FIG. 9 also provides a schematic diagram of an embodiment of a fault detection system.

Detailed ways

Image monitoring equipment is used in security and other fields that require strict timeliness. Therefore, for an image monitoring system, if it can be detected that the camera (or a monitoring camera, which can take pictures) is functioning properly, it can intervene in time once the abnormality of the camera is detected, which is a common concern in the industry.

Referring to the image monitoring system in FIG. 1 , both the camera 111 and the camera 112 communicate with the storage server 12 , and the storage server 12 communicates with the image analysis server 14 . The management server 13 is located between the camera 111 and the storage server 12 and is used for the registration of the camera 111 .

Taking the camera 111 as an example, in this embodiment of the present invention, when the camera 111 does not send a service picture message, the camera 111 constructs a detection picture message and sends it to the storage server 12 . The storage server 12 receives the detection picture message from the camera 111 , and if the picture message from the camera 111 is not received within a predetermined time, it is determined that the camera 111 is faulty. The type of the fault may be a picture message generation failure or a picture message sending failure. After knowing the camera 111 failure, the camera 111 can be intervened as soon as possible, such as upgrading, restarting, and repairing.

Similarly, the method can also be used between the storage server 12 and the image analysis server 14, and the image analysis server 14 detects the failure of the storage server 12. Therefore, the embodiment of the present invention is not limited to a combination of a camera and a storage server, but can also be, for example, a combination of a camera and an image analysis device, a combination of an image storage device and an image analysis device, a combination of an image analysis device and an image analysis device, and an image storage device. A combination of device and image storage device. In other words, the embodiments of the present invention can be broadly understood as being used for: the picture message receiving device detects the picture message generating/sending function of the picture message sending device. When the picture message sending device has no service picture message to send to the picture message receiving device, the picture message sending device sends an additional picture detection message to the picture message receiving device, thereby maintaining the sending of the picture message frequency, to avoid that the picture message sending device does not send picture messages for a long time. The picture message receiving device determines whether the picture message sending device operates normally by detecting whether the next picture message is not received within a preset time period after receiving the previous message.

Referring to FIG. 2 , a detailed description is given below by taking an example that the picture message sending device is a camera and the picture message receiving device is a storage server.

21. A camera (camera) sends a registration message to a management server, and the management server registers the camera after receiving the registration message. After the registration is successful, the management node notifies the storage server that the camera has been online. The registration information includes identification information of the camera, such as a camera ID or a camera position.

The channel for transmitting the registration message between the camera and the management server and between the management server and the storage server may be a dedicated management channel, and the management channel is not used for transmitting service data (eg pictures). The management server may be independent of the camera and the storage server, or may be integrated with one of them.

22. The storage server sends a picture (or picture message) request to the camera, so as to request the camera to obtain a picture (or picture message).

23. After receiving the picture request sent by the storage server, the camera sends a response message to the storage server. The response message carries: a message sending confirmation command, a picture message detection command, and a picture message sending cycle detection.

The message sending confirmation instruction is used to inform the storage server that the camera is ready to send the picture message.

Both the detection picture message instruction and the detection picture message sending period are used for negotiation with the storage server. The instruction for detecting the picture message is used to inform the storage server that the camera supports the function of "message sending function detection"; therefore, the storage server can enable the corresponding function to detect the camera Is the picture message generation function normal. The packet sending period is used to inform the storage server of the additional packet sending period supported by the camera (in this embodiment, this packet sending period is set to 10 seconds).

24. After receiving the response message, the storage server enables the "device failure detection function", so as to judge the time interval of the received messages. And, the storage server records the message sending period, so as to detect whether the function of the camera is normal according to the sending period in subsequent steps.

It should be noted that there are multiple ways to negotiate the packet sending period. For example: (1) the camera sends a single time period for the storage server to record; (2) the camera sends multiple time periods for the storage server to select; (3) the storage server and the camera each send For the time period that can be supported by itself, a third-party device (for example, the management server) arbitrates a period supported by both parties.

25. The camera sends a service picture message to the storage server in the form of a picture message. In this embodiment of the present invention, the camera photographs objects to generate business pictures, and the photographed objects may be moving objects, such as one of the following: any moving objects, moving vehicles, pedestrians, and animals. The captured picture is sent by the camera to the storage server for persistent storage.

The picture taken by the camera (in order to distinguish it from the picture used for detection, the picture obtained through shooting is called a business picture) is firstly structured as a TLV (type/tag, length, value; type/tag, length, value) data structure. way to encode. The tag (or type) describes the data type of the value, the length describes the length of the value, and the value carries data including business pictures. For example, a value includes two pictures, or another TLV can be nested in the value. data structure. 3 is a schematic diagram of an embodiment of a TLV data structure of the present invention, where a picture is carried in the value; the optional value can also carry a picture serial number, which describes the serial number of the picture sent by the camera. The serial numbers of the pictures are also different. Optionally, the value can also carry the number of pictures (not shown).

The TLV data format is encapsulated into a real-time transport protocol (RTP) message as a payload for network transmission. The RTP protocol is used to provide end-to-end streaming media transmission services for voice, image, fax and other multimedia data that need to be transmitted in real time. The RTP message includes: a header (head), an extension (extend) and a payload (payload). In the present invention, the picture message is transmitted between the camera and the storage server in the form of a media stream, and the camera sends the pictures including the first picture and the second picture to the storage server through the media stream. A media stream used to transmit pictures may also be referred to as a picture stream.

Similarly, pictures can also be encoded into json data format, and the json data format can be encapsulated into HTTP protocol packets for transmission.

26. Whenever the time that the camera stops sending service pictures reaches the message sending period, the specific picture starts to continuously send the detection picture message to the storage server, and the time interval between the detection messages is less than or is equal to the packet sending period. After starting to send the service picture again, stop sending the detection picture message, until stop sending the service picture message again, restart the sending of the detection picture message, and so on.

The format of the detection picture message in this step is the same as the message format introduced in step 25, for example, TLV+RTP or json+HTTP. The difference is that, in step 25, the value of the data format carries the service picture and does not carry the detection label; while in the embodiment of the present invention, the value additionally carries the detection label, and the message carrying the detection label is the detection picture. message. The value can also carry detection images, such as blank images, company logos, and other images. The value can also carry no image.

In actual use, the camera's shooting objects often do not appear all the time, but have a regularity in time. Therefore, the business pictures sent by the camera are intermittent rather than continuous, and the length of the intermittent time is long or short. . In the following, after the camera detects a pedestrian, a picture of the pedestrian is taken and sent to the storage server as an example for introduction. Such cameras can be installed in subway entrances, office buildings, hospitals and other places. Taking the camera installed at the door of an office building as an example, during the daytime commuting hours, people frequently enter and leave the office building, so the business pictures may be continuous (in this case, pictures are continuously sent from the camera to the storage server), or, although not Continuous but the interval between picture streams is very short (for example, the interval between sending two service picture packets before and after does not exceed 2 seconds). During non-commute hours, fewer people enter and leave the office building, and business pictures are often not continuous, but at long intervals. At night, the pedestrians that can be photographed by the camera become extremely rare, and it is even possible that no one passes the camera all night, so that the camera does not send pictures to the storage server all night.

There are two possibilities that no pictures are sent from the camera to the storage server: one possibility is that there is no subject within the shooting range of the camera; the other possibility is that a part of the camera is malfunctioning. picture, but the picture message cannot be sent. Night is a high-incidence period of public security incidents. Once the function of the camera is abnormal, it needs to be maintained in time to avoid missing key picture messages. In the prior art, solutions such as heartbeat technology are used to detect whether the camera is normal, but the heartbeat message is too simple, and the storage server receives the heartbeat message only to prove that the network between the camera and the storage server is normal, and the network of the camera is normal. The function is normal; however, it is impossible to detect whether the function of the camera to generate the picture message is normal, and whether the function of the camera to send the picture message is normal.

In this embodiment, after finishing sending a service picture, the camera starts a timer, and after the timer reaches 10 seconds, an additional detection picture message is sent to the storage server, and when the timer reaches 10 again Seconds later, send an additional picture message to the storage server again. That is to say, when the camera does not send a picture message to the storage server, it periodically sends a detection picture message to the storage server. When the camera has a new service picture to send to the storage server (for example, if a pedestrian is detected passing by the camera's shooting range, a picture is taken and a picture message is sent to the storage server), the timer is cleared. zero.

Referring to FIG. 4 , the detection picture message carries a detection label. Specifically, the detection label can be carried in the value of the TLV data structure; it should be noted that the picture data is not the necessary content in the detection picture message, so The detection picture message does not carry a picture, even if it does not carry a picture, it is still a picture message. Referring to FIG. 5 , the TLV data structure of the picture detection message may further carry: the number of pictures, and pictures (picture 1, picture 2). Further, the value can also carry information such as the date of the picture (not shown), the size of each picture (not shown). There are many options for pictures, such as: blank pictures; company logo pictures, advertising pictures, business pictures that have been sent, etc.

Referring to FIG. 6 , optionally, in each picture message sent by the camera, the serial number of each picture may also be added. In the embodiment of the present invention, there are three types of carrying rules for picture serial numbers: (1) neither the service picture message nor the detection picture message carry the picture serial number; (2) the service picture message, the detection picture message do not carry the picture serial number; The picture messages all carry picture serial numbers, and the serial numbers are consecutive; (3) the service picture messages carry the picture serial numbers, and the serial numbers are consecutive; the detection picture message does not carry the picture serial numbers.

27. When the storage server does not receive a message from the camera within a preset length of time (for example, 1 message sending cycle: 10 seconds; or, 3 message sending cycles: 10 seconds×3=30 seconds) If the picture message is sent, an alarm will be issued.

When the storage server does not receive a picture message from the camera within a preset time period. This means that the camera is malfunctioning. In addition to network failures, downtime failures and other basic failures, there may also be a failure in the function of generating image packets, for example, the function of constructing the TLV data structure has failed, or the TLV data structure has been encapsulated into RTP packets. The function of sending RTP packets may also be faulty. These faults are often caused by software factors such as system instability and software incompatibility, so they are more likely to occur than other faults. In particular, these failures cannot be detected by existing technologies such as heartbeat messages. Therefore, compared with the prior art, the embodiment of the present invention can detect a specific failure of the camera.

The embodiment of the present invention can cover the fault range that can be detected by the heartbeat message, so the heartbeat mechanism can be replaced. Of course, the embodiment of the present invention can be used in parallel with the heartbeat mechanism. In this case, if the heartbeat message is normally received but the detection picture message is not normally received, some basic faults (for example, the connection between the camera and the storage server) can be eliminated. network fault, the camera downtime fault), so that the fault can be more accurately located to the TLV generation fault, the RTP packet generation fault, etc. described in the embodiment of the present invention.

After receiving the detection picture message, the storage server parses the received message, and can confirm whether the received message is a service picture message or a detection picture message by judging whether there is a detection mark. For service pictures, the storage server needs to store them; and for the detection pictures, the storage server can discard them. Therefore, after the storage server detects the detection identifier in the message, it can identify that it is a detection picture message. In this way, the storage server can determine that the camera is currently in a normal working state, but there is no service picture to send; in addition, the storage server separates the detected picture message from the ordinary picture message, and does not make persistent storage. Of course, optionally, the additional message may also be stored.

The alarm may prompt that the camera is abnormal, and trigger the maintenance process. For example, the storage server tries to re-establish the data channel with the camera, and confirms again whether the camera is abnormal; or, the administrator can further detect the camera after receiving the alarm.

When the picture sequence number is carried in the data structure, the picture sequence number is further recorded in this step.

28. After receiving the picture message, the storage server reads the TLV in the RTP message, and obtains the picture sequence number from the TLV. This step is optional and can be performed periodically, such as every 24 hours.

When both the service picture message and the detection picture message carry the picture sequence number. If the serial numbers are not consecutive, it means that there is a picture missing (may be a business picture or a detection picture), then record it. According to the inspection identification, it can be further determined whether the lost picture is a service picture or a detection picture. If the lost picture is a business picture, in addition to recording, the storage server sends a retransmission request to request the camera to resend the lost picture. If the detected picture is lost, it will not be retransmitted, but only recorded.

When the picture serial number is carried in the service picture message, the picture serial number is not carried in the detection picture message. If the serial numbers are not consecutive, it means that the service picture is lost, so the storage server sends a retransmission request to request the camera to resend the lost picture; and record the loss. The service picture loss rate is obtained according to statistics on the loss of the picture sequence numbers in the plurality of received service pictures.

The storage server can summarize the packet loss situation, obtain the packet loss rate, and feed it back to the host (personal computer, mobile phone, PAD, etc.). The reliability of the network can be judged by the packet loss rate.

Referring to FIG. 7 and FIG. 8 , embodiments of a device fault detection method are respectively introduced from the camera side and the storage server side.

The flow of the camera is as follows:

Step 31: The camera sends a service picture message, and after each service picture message is sent, a local timer of the camera is started.

Step 32 , when the timer counts for more than 10 seconds and no new service picture message is sent, go to step 34 ; when a new service picture message is sent within 10 seconds, go to step 33 .

Step 33, reset the local timer.

Step 34: Generate a detection picture message and send it to the storage server. The sending period of detection packets is less than 10 seconds (at least less than 30 seconds).

Step 35, when the camera has sent a new service picture message within 10 seconds after sending a detection picture message, then enter step 33, reset the local timer; otherwise, enter step 34, so as to send the detection picture again. picture message.

The process of storing the server is as follows:

Step 41: Receive a picture message sent by the camera, and start a local timer to start timing after receiving the picture message. Each time a new picture message is received, the local timer of the storage server is reset to restart the timing.

Step 42, the storage server detects whether a new picture is received within 30 seconds according to the timing of the timer.

When the timer reaches 30 seconds and is still not reset, go to step 44; otherwise, go to step 43.

Step 43, reset the local timer.

Step 44, sending out an alarm signal that the camera is faulty. The alarm can carry the specific fault type: the picture message generation function failure, or the picture message sending function failure. Considering that the probability of failure of the picture message sending function is low, it can be ignored in some cases, so the failure type can also be: picture message generation function failure.

Referring to FIG. 9 , the present invention further provides an embodiment of a fault detection system. The fault detection system includes: a picture message sending device 4 and a fault detection device 5 . Wherein, the picture message sending apparatus 4 may execute the embodiments described in the foregoing methods 31-35; the fault detection apparatus 5 may execute the embodiments described in the foregoing methods 41-44; the combination of the two apparatuses may execute Embodiments described in the above method steps 21-28. Since the method embodiments have been described in detail, only a brief description is given below.

The picture message sending device 6 includes: a processing module 61 , a detection message generating module 62 and a sending module 63 . Wherein, the sending module 63 is configured to send the service picture message. The processing module 61 is configured to determine whether the duration for which the picture message sending device stops sending the service picture message reaches a second duration. The sending module 63 is further configured to send the fault detection message (the second picture message) when the judgment result is that the second time period is reached.

The fault detection device 5 includes: a receiving module 51 , a processing module 52 , and an alarming module 53 . The receiving module 51 is configured to receive the message sent by the sending module 63 . The processing module 52 is configured to determine whether the second picture message sent by the picture message sending device has been received within a first time period since the first picture message was received. The alarm module 53 is configured to send a fault alarm signal from the picture message receiving device when the picture message receiving device does not receive the second picture message.

The present invention also provides an embodiment of a device failure detection system, which includes a picture message sending device and a picture message receiving device that communicates with the picture message sending device. The device failure detection system includes: the picture message sending device. It is used for: sending a service message carrying a service picture to the picture message receiving device; when the duration of stopping sending the service picture reaches a second duration, continuously sending a fault detection message to the picture message receiving device, The time interval between the fault detection messages is less than the second duration; the picture message receiving device is used to: receive the picture message sent by the picture message sending device, and when the first duration exceeds the first duration, no two are received. picture message, the picture message receiving device sends an alarm signal.

The present invention also provides an embodiment of a storage medium, where the storage medium includes computer instructions, when the instructions are run on a picture message receiving device, the picture message receiving device causes the picture message receiving device to execute the above-mentioned method from the picture The steps performed by the message receiving device.

The present invention also provides an embodiment of a picture message receiving device. The picture message receiving device includes a processor (optionally, a memory for storing computer instructions), and the processor executes the above method by running the computer instructions. Steps performed by the picture message receiving device.

An embodiment of a computer program product can be executed in the steps performed by the foregoing picture message sending device. The computer program product includes: an instruction for receiving a first picture message sent by a picture message sending device; and for judging whether the first picture message has been received within a first duration since the first picture message was received an instruction for a second picture message sent by a picture message sending device; and an instruction for sending a fault alarm signal from the picture message receiving device when the second picture message is not received, wherein the second picture message A message is an instruction to detect a picture message.

One or more of the above modules may be implemented in software, hardware, or a combination of both. When any of the above modules is implemented in software, the software exists in the form of computer program instructions and is stored in the memory, and the processor can be used to execute the program instructions and implement the above method flow. The processor may include, but is not limited to, at least one of the following: a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a microcontroller (MCU), or artificial intelligence Processors and other types of computing devices that run software, each computing device may include one or more cores for executing software instructions to perform operations or processing. The processor may be built in a SoC (system on chip) or an application specific integrated circuit (ASIC), or may be an independent semiconductor chip. Outside the core for executing software instructions to perform operations or processing, the internal processing of the processor may further include necessary hardware accelerators, such as field programmable gate array (FPGA), PLD (Programmable Logic Device), Or a logic circuit that implements dedicated logic operations.

When the above modules are implemented in hardware, the hardware can be CPU, microprocessor, DSP, MCU, artificial intelligence processor, ASIC, SoC, FPGA, PLD, dedicated digital circuit, hardware accelerator or non-integrated discrete device. Any one, or any combination, may run the necessary software or be independent of software to perform the above method flows.

Claims (14)

1. the fault detection method of a picture message sending device, is characterized in that, picture message receiving device communicates with picture message sending device, and described method comprises: The picture message receiving device receives the first picture message from the picture message sending device; The picture message receiving device determines whether it has received the second picture message sent by the picture message sending device within a first time period after receiving the first picture message; When the picture message receiving device does not receive the second picture message, the picture message receiving device sends a fault alarm signal, wherein the first picture message is a service picture message carrying a service picture , the second picture message is a detection picture message; the detection picture is a detection picture constructed by the picture message sending device. 2. The method according to claim 1, wherein The failure alarm signal is used to indicate a failure of the picture message generation function of the picture message sending device. 3. The method according to claim 2, wherein the detection picture message is an RTP message encapsulated into a TLV data structure, and the failure that the fault alarm signal is used to indicate comprises: The function of constructing the TLV data structure of the picture message sending device fails; or The function of the picture message sending device to encapsulate the TLV data structure into the RTP message is faulty. 4. The method according to claim 2, wherein the detection picture message is an HTTP message encapsulated into a json data structure, and the failure that the fault alarm signal is used to indicate comprises: The function of constructing a json data structure of the picture message sending device fails; or The function of the picture message sending device to encapsulate the json data structure into an HTTP message is faulty. 5. The method of claim 1, wherein the method further comprises: The picture message receiving device receives a plurality of service picture messages sent by the picture message sending device, and the plurality of service picture messages further carry picture sequence numbers; The service picture loss rate is obtained according to statistics of the picture sequence numbers in the plurality of service picture messages received. 6. The method of claim 1, further comprising: The picture message receiving device stores the service picture in the first picture message; The picture message receiving device discards the data in the second picture message. 7. The method according to any one of claims 1-6, wherein the method further comprises: The picture message sending device sends the first picture message to the picture message receiving device; After the picture message sending device stops sending the first picture message for a second time period, the picture message sending device sends the second picture message to the picture message receiving device, wherein , the second duration is less than or equal to the first duration. 8. The method according to any one of claims 1-6, characterized in that, The picture message sending device is a camera, and the picture in the first picture message is captured by the camera; the picture message receiving device is a storage server, or the picture message receiving device is an image analysis server . 9. A fault detection device for a picture message sending device, characterized in that, comprising: a receiving module, configured to receive the first picture message from the picture message sending device; a processing module, configured to determine whether the second picture message sent by the picture message sending device is received within a first time period after receiving the first picture message; an alarm module, configured to send a fault alarm signal when the judgment result of the processing module is that the second picture message is not received, wherein the first picture message is a business picture message carrying a business picture, so The second picture message is a detection picture message; the detection picture is a detection picture constructed by the picture message sending device. 10. The device according to claim 9, wherein the detection picture message is an RTP message encapsulated into a TLV data structure, and the failure that the fault alarm signal is used to indicate comprises: The function of constructing the TLV data structure of the picture message sending device fails; or The function of the picture message sending device to encapsulate the TLV data structure into the RTP message is faulty. 11. The device according to claim 9, wherein the detection picture message is an HTTP message encapsulated into a json data structure, and the failure that the fault alarm signal is used to indicate comprises: The function of constructing a json data structure of the picture message sending device fails; or The function of the picture message sending device to encapsulate the json data structure into an HTTP message is faulty. 12. The apparatus according to any one of claims 9-11, wherein the picture message sending device is a camera, and the picture in the first picture message is obtained by shooting the camera; the apparatus is a storage server, Or an image analysis server. 13. A fault detection system for a picture message sending device, comprising a picture message sending device and a picture message receiving device communicating with the picture message sending device, characterized in that: The picture message sending device is used for: sending a service picture message carrying a service picture to the picture message receiving device; when the duration of stopping sending the service picture message reaches a second duration, continuously sending a fault detection message send the message to the picture message receiving device, and the time interval between the failure detection messages is less than the second duration; the failure detection message is a detection picture message; the detection picture is the picture message sending device The constructed detection image; The picture message receiving device is used for: receiving the picture message sent by the picture message sending device, and when two picture messages are not received after a first time period, the picture message receiving device sends a fault alarm signal . 14. A storage medium comprising computer instructions which, when executed on a picture message receiving device, cause the picture message receiving device to perform the method of any one of claims 1 to 8.

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