Emergency evacuation supervision method and device based on emergency broadcast system

Abstract

The invention discloses an emergency evacuation supervision method and device based on an emergency broadcast system, and relates to the technical field of emergency broadcast supervision, and the method comprises the steps: dividing a target village into a plurality of management grids through a spatial clustering and graph division algorithm based on the residence position of each villager, the safety collection region position and a village road network, and carrying out the management of the village. The method comprises the following steps: analyzing a monitoring video stream returned by monitoring equipment located in an exit area of each management grid in real time in each management grid; determining the state of the non-evacuated villagers and executing a supervision strategy; distributing patrol personnel to the management grid nearby or inserting targeted reminding information to the nearest emergency broadcasting equipment which is playing the evacuation information according to the residence position information of the non-evacuated villagers. Through monitoring the evacuation completion condition of villagers in each management grid, non-evacuated villagers can be quickly found, point-to-point assistance and reminding of patrol personnel can be accurately scheduled, and the supervision closed loop of the evacuation state of the villagers in the emergency evacuation process can be completed.

Description

Technical Field

[0001] This invention relates to the field of emergency broadcast monitoring technology, specifically to an emergency evacuation monitoring method and equipment based on an emergency broadcast system. Background Technology

[0002] In rural suburbs and other sparsely populated areas, emergency broadcasting systems (such as village-wide loudspeakers) are often installed to issue unified instructions to villagers. While routinely used for disseminating safety information, these systems are crucial for emergency situations such as earthquakes, floods, and landslides, requiring advance notice for villagers to evacuate to designated safe areas. Current evacuation methods primarily rely on emergency broadcasting equipment installed throughout the village to send evacuation notices, sometimes supplemented by patrolling villagers who check each household to ensure evacuation. However, rural areas are vast and sparsely populated, and these patrolling villagers only provide notification; they fail to effectively monitor whether villagers have evacuated and whether they have reached the designated safe areas, resulting in low efficiency and a high risk of missing crucial rescue time.

[0003] Therefore, the problem that needs to be solved is how to combine emergency broadcasting and village road monitoring equipment to form an emergency broadcasting system to monitor the evacuation status of villagers during emergency evacuation. Summary of the Invention

[0004] The purpose of this invention is to provide an emergency evacuation monitoring method and equipment based on an emergency broadcasting system. By dividing a sparsely populated target village into multiple management grids, the evacuation status of villagers in each management grid can be monitored, villagers who have not yet evacuated can be quickly identified, and patrol personnel can be accurately dispatched to provide point-to-point assistance and reminders, thus completing a closed loop of monitoring the evacuation status of villagers during the emergency evacuation process.

[0005] To achieve the above objectives, this application adopts the following approach: On the one hand, this application provides an emergency evacuation monitoring method based on an emergency broadcast system, specifically including the following steps: S1. Obtain the residential locations of each household in the target village within the area to be evacuated, the village road network, the location of the safe assembly area, and the deployment locations of each emergency broadcasting and monitoring device in the target village. S2. Based on the residential location of each villager, the location of the safe collection area, and the village road network, the target village is divided into multiple management grids through spatial clustering and graph partitioning algorithms. Each emergency broadcasting device and monitoring device is then associated with each management grid according to its deployment location. S3. Obtain the real-time monitoring video stream transmitted by the monitoring equipment located in the exit area of ​​each management grid, identify the villagers in the monitoring video stream, and analyze the villagers' evacuation completion status within the preset time window after the emergency broadcast equipment starts playing evacuation information in each management grid. S4. If there are villagers who have not been evacuated in the management grid, determine the status of the villagers who have not been evacuated, and implement the monitoring strategy according to the status of the villagers who have not been evacuated. The monitoring strategy includes assigning patrol personnel to the nearest location in the management grid or inserting targeted reminder information into the nearest emergency broadcasting device that is playing evacuation information based on the residential location information of the villagers who have not been evacuated.

[0006] In some specific implementation plans, the village road network includes multiple intersecting village roads. Based on road width and whether they connect to county roads, each village road is divided into main roads and branch roads / lanes. Main roads located on the pre-determined evacuation routes are marked as evacuation routes according to the pre-defined evacuation routes determined in the drills. The specific process of dividing multiple management grids in step S2 is as follows: The village road network is constructed with the location of each villager's residence as the node and the village road connecting each residence as the edge. A clustering algorithm based on road network constraints is used to divide the village road network into multiple management grids. Each management grid must contain an evacuation main road, and each household in each management grid can return to the evacuation main road through the shortest branch road. Each management grid is numbered based on its distance from the safe assembly area, and an exit area is determined for each management grid, which must include the evacuation route.

[0007] In some specific implementation plans, the specific process of dividing the village road network is as follows: S01. Randomly select k nodes in the village road network as the initial central nodes, and mark the location of the evacuation main road closest to the central node as the central road; S02. For each non-central node, calculate the straight-line distance from the non-central node to each central node and the shortest path distance from the non-central node to each central node along the village road network through the central road. S03. Calculate the weighted sum of the straight-line distance and the shortest path distance to obtain the comprehensive distance; S04. Compare the combined distances from non-central nodes to each central node, and assign the non-central nodes to the cluster containing the central node with the closest combined distance. S05. For each cluster, traverse all nodes within the cluster and try to use each node as the new center node. Calculate the sum of the comprehensive distances from all nodes in the cluster to the new center node if the new center node is taken as the center. Select the node with the smallest sum of comprehensive distances as the updated center node. S06. Repeat step S05 above until the central nodes of all clusters are no longer updated, and divide the nodes and village road sections contained in each cluster into a management grid.

[0008] In some specific implementation plans, the process of identifying and analyzing the completion status of villager evacuation within the management grid is as follows: The system acquires real-time surveillance video streams transmitted from the safe collection area, identifies villagers in the surveillance video streams, and stores the identified villager information in the first villager information table. The monitoring video streams transmitted back by the monitoring equipment located in the exit area of ​​each management grid are identified, and the identified villager information is stored in the second villager information table. Obtain the villager management list that records information about each household in the target village, and cross-match the first villager information table, the second villager information table, and the villager management list. Finally, mark the evacuation completion status of each villager in the villager management list.

[0009] In some specific implementation plans, the process of marking the completion status of evacuation for each villager is as follows: The villager information in the first villager information table is traversed and matched with the villager management list. The villager information that is successfully matched is marked as evacuated in the villager management list. The second villager information table is matched with the first villager information table. If there is villager information in the second villager information table that cannot be matched with the first villager information table, then the villager information is marked as a villager being evacuated in the villager management list. Match the villager management list with the second villager information table, and mark the villagers in the villager management list who cannot be matched in the second villager information table and who are not marked as evacuated villagers as not evacuated villagers.

[0010] In some specific implementation plans, the process for determining the status of villagers who have not been evacuated is as follows: Determine whether the villagers who have not been evacuated are key individuals to watch out for. If they are key individuals to watch out for, then the status of the villagers who have not been evacuated is that they are at home and need assistance to evacuate. If they are not key personnel to be monitored, then continue to determine whether the villagers who have not been evacuated are not in the village. If the villagers are not in the village, then the status of the villagers who have not been evacuated is that they do not need to be evacuated. If it is in a village, then continue to determine whether the villagers who have not been evacuated are inside their residences; If a villager who has not been evacuated is inside their residence, then the status of the villager who has not been evacuated is "at home but not evacuated"; If it is determined that the villagers who have not evacuated are temporarily away from their residences, then the status of the villagers who have not evacuated is "awaiting evacuation status".

[0011] In some specific implementation plans, the process of implementing monitoring strategies based on the status of villagers who have not yet been evacuated is as follows: When a villager who has not been evacuated is at home and needs assistance to evacuate, a rescue dispatch instruction is sent to the patrol personnel in the management grid that is closest to the villager who has not been evacuated, guiding the patrol personnel to their residence to assist in the evacuation. When a villager who has not evacuated is in the status of being at home but not evacuated, the first broadcast instruction is generated and executed: a targeted evacuation notification message containing the villager's personal information is sent to the emergency broadcast device closest to the villager's residence, and the exit areas of each management grid are monitored in real time to see whether any villager who has not evacuated is captured on camera; When the status of the villagers who have not been evacuated is "awaiting confirmation of evacuation", a second broadcast command is generated and executed to intermittently broadcast targeted evacuation notification messages containing their personal information to each emergency broadcasting device in the target village, and to monitor in real time whether any villagers who have not been evacuated are photographed in the exit areas of each management grid.

[0012] In some specific implementation plans, the process for determining whether villagers who have not evacuated are no longer in the village is as follows: Based on the location of the residences of the villagers who have not been evacuated, the monitoring equipment closest to the residences is called up to obtain the monitoring images during the nighttime period before the emergency broadcast equipment starts playing evacuation information. The changes in the lighting at the residences in the monitoring images are analyzed. If there are changes in the lighting at the residences during the nighttime period, it is determined that the villagers who have not been evacuated are still in the village. If the lighting at the residential location does not change during the nighttime period, it is determined that the villagers who have not been evacuated are not in the village.

[0013] In some specific implementation plans, the process for determining whether villagers who have not evacuated are still in their residences is as follows: Based on the location of the residences of the villagers who have not been evacuated, the monitoring and audio equipment covering the residential area closest to the residences are called up to obtain the monitoring images within the first preset time period before the emergency broadcast equipment starts playing the evacuation information. The monitoring images are analyzed to see if people enter or leave the residences and whether the audio equipment can collect the human voice characteristics inside the residences. If the surveillance footage does not show any people entering or leaving the residence but the audio equipment can capture human voice characteristics, or if the surveillance footage identifies people entering the residence but does not detect anyone leaving the residence, then it is determined that the evacuated villager is currently in their residence.

[0014] Secondly, this application provides an emergency evacuation monitoring device based on an emergency broadcasting system, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the emergency evacuation monitoring method based on an emergency broadcasting system as described in the first aspect.

[0015] The inventive concept of this application is as follows: When an emergency occurs and villagers need to be evacuated from a target village in advance, the villagers are usually notified to evacuate to the assembly point through emergency broadcasts or patrol personnel are arranged to conduct door-to-door checks and reminders. However, the broadcasts and patrol personnel operate independently. Since the villagers are scattered throughout the village, the situation can only be counted at the assembly point, and the real-time evacuation status of the villagers cannot be known. In addition, it is obviously time-consuming to arrange patrol personnel to conduct door-to-door checks. Therefore, it is impossible to achieve real-time monitoring of the villagers' evacuation status during the emergency evacuation process.

[0016] Existing systems effectively integrate emergency broadcasting, monitoring, and microphones, combining remote monitoring and emergency broadcasting capabilities to achieve integrated security and prevention. Therefore, this application further proposes to intelligently divide the complex village geography and population distribution into multiple management grids based on geographical, road network, and scale constraints, refining the granularity of supervision. By tracking the evacuation completion status of villagers in each management grid, the evacuation status of the entire village can be grasped. The system monitors the evacuation status of each management grid in real time and intelligently determines the status of those who have not evacuated (e.g., "at home and a key person", "at home but not a key person", "temporarily out"). It automatically triggers differentiated and precise dispatch strategies to ensure that valuable rescue forces and communication resources can be prioritized for the most urgent and effective aspects, greatly improving the overall rescue efficiency and success rate. Attached Figure Description

[0017] Figure 1 A flowchart of an emergency evacuation monitoring method based on an emergency broadcasting system provided in this embodiment of the invention; Figure 2 This is a management grid division diagram of the target village provided in an embodiment of the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0020] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0021] Furthermore, for clarity and brevity, descriptions of well-known structures, functions, and configurations may have been omitted. Those skilled in the art will recognize that various changes and modifications can be made to the examples described herein without departing from the spirit and scope of this disclosure.

[0022] Techniques, methods, and equipment known to ordinary people in the relevant fields may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0024] Example 1 like Figure 1 As shown, this embodiment provides an emergency evacuation monitoring method based on an emergency broadcast system, specifically including the following steps: S1. Obtain the residential locations of each household in the target village within the area to be evacuated, the village road network, the location of the safe assembly area, and the deployment locations of each emergency broadcasting and monitoring device in the target village. S2. Based on the residential location of each villager, the location of the safe collection area, and the village road network, the target village is divided into multiple management grids through spatial clustering and graph partitioning algorithms. Each emergency broadcasting device and monitoring device is then associated with each management grid according to its deployment location. Understandably, village road networks consist of numerous intersecting village roads. These roads are divided into main roads and branch roads / lanes based on their width and whether they connect to county roads. Main roads along evacuation routes are marked as evacuation arteries based on pre-determined evacuation routes established in drills. When dividing management grids, since evacuation routes are always designed along main roads, and villagers are informed of these routes during emergency drills, and since there is typically a wide main road leading to important areas (such as the village committee or school) in a village, and safe assembly areas are often located in these areas, each household either accesses the main road through their own village lanes or has a house built near the main road. Therefore, the main road becomes the only route for villagers to evacuate to the safe assembly area, and the management grid must include the area where the main road is located. Furthermore, each management grid typically has several villagers who volunteer or are assigned by the village head as patrol personnel. For example... Figure 2As shown, one of the division states of the management grid is given. It can be seen that for villagers 1 and 2 in management grid 1, they are both connected to the first section of the evacuation main road through the corresponding branch road. The monitoring device 1 on the first section of the evacuation main road serves as the monitoring device for the exit area of ​​management grid 1, which monitors the information of villagers evacuating from the evacuation main road to the safe assembly area in real time. Since villagers 3 are far away from both villagers 1 and villagers 2, villagers 3 are assigned to management grid 2, and their evacuation completion status is monitored by monitoring device 2.

[0025] Specifically, the process of dividing the area into multiple management grids is as follows: S21. Construct a village road network with the residential location of each villager as a node and the village road connecting each residential location as an edge. S22. The village road network is divided into multiple management grids using a clustering algorithm based on road network constraints. Each management grid must contain an evacuation main road, and each household in each management grid can return to the evacuation main road through the shortest branch road. The specific process of dividing the village road network is as follows: S01. Randomly select k nodes in the village road network as the initial central nodes (you can choose patrol personnel or villagers to focus on), and mark the location of the evacuation main road closest to the central node as the central road; S02. For each non-central node, calculate the straight-line distance from the non-central node to each central node and the shortest path distance from the non-central node to each central node along the village road network through the central road. S03. Calculate the weighted sum of the straight-line distance and the shortest path distance to obtain the comprehensive distance; S04. Compare the combined distances from non-central nodes to each central node, and assign the non-central nodes to the cluster containing the central node with the closest combined distance. S05. For each cluster, traverse all nodes within the cluster and try to use each node as the new center node. Calculate the sum of the comprehensive distances from all nodes in the cluster to the new center node if the new center node is taken as the center. Select the node with the smallest sum of comprehensive distances as the updated center node. S06. Repeat step S05 above until the central nodes of all clusters are no longer updated, and divide the nodes and village road sections contained in each cluster into a management grid.

[0026] In step S06, it is also necessary to check whether the nodes in each management grid are connected in the village road network. That is, to further adjust the village roads marked with dangerous enclaves (enclaves caused by the failure of critical paths such as bridges and tunnels) in the village road network (such as reassigning the node to the management grid where the nearest reachable center node is located) to avoid the occurrence of starting from the node, passing through dangerous enclaves, and reaching the safe set area.

[0027] S23. Number each management grid according to its distance from the safe assembly area, and determine the exit area for each management grid. The exit area must include the evacuation route.

[0028] S3. Obtain the real-time monitoring video stream transmitted by the monitoring equipment located in the exit area of ​​each management grid after the emergency broadcast equipment starts playing evacuation information. Identify the villagers in the monitoring video stream and analyze the villagers' evacuation completion status within a preset time window (e.g., within ten minutes) after the emergency broadcast equipment starts playing evacuation information in each management grid. Specifically, in order to monitor the real-time evacuation completion status of villagers in each management grid, the specific process of identifying and analyzing the evacuation completion status of villagers in the management grid is as follows: S31. Real-time acquisition of the surveillance video stream transmitted back from the safe assembly area, identification of villagers in the surveillance video stream (identification of behavior trend as entering the safe assembly area and personnel identity as ordinary villagers), and storage of the identified villager information in the first villager information table. S32. Identify the monitoring video streams transmitted back by the monitoring equipment located in the exit area of ​​each management grid (identify the behavior trend as leaving the management grid and the person's identity as an ordinary villager), and store the identified villager information in the second villager information table; S33. Obtain a villager management list that records information about each household in the target village (the villager population information can be stored normally according to the household registration book, and the villager management list can be called when needed, and the identity information of patrol personnel and other management personnel can be distinguished from the information of ordinary villagers. Then, the villager management list is grouped according to the management grid, so that each management grid corresponds to the information of the villagers managed in it, which facilitates the accurate location of the unevacuated personnel). Cross-match the first villager information table, the second villager information table and the villager management list, and finally mark the evacuation completion status of each villager in the villager management list.

[0029] Specifically, the process of marking the completion status of each villager's evacuation is as follows: The villager information in the first villager information table is traversed and matched with the villager management list. The villager information that is successfully matched is marked as evacuated in the villager management list. The second villager information table is matched with the first villager information table. If there is villager information in the second villager information table that cannot be matched with the first villager information table, then the villager information is marked as a villager being evacuated in the villager management list. Match the villager management list with the second villager information table, and mark the villagers in the villager management list who cannot be matched in the second villager information table and who are not marked as evacuated villagers as not evacuated villagers.

[0030] Understandably, the first villager information table records ordinary villagers who have entered the safe assembly area, while the second villager information table contains information on ordinary villagers who have left each management grid according to their grid number. The villager information identified here may include individuals temporarily away from or evacuated from other management grids. Therefore, during matching, the first villager information table is first matched to filter out those who have already entered the safe assembly area. Then, the first villager information is matched with the second villager information to identify those who have left home and are evacuating. Matching the second villager information with the villager management list according to grid number identifies those who have not evacuated from each management grid. These ordinary villagers who are neither in the management grid nor have reached the safe assembly area are the key personnel requiring monitoring. For these individuals, it is necessary to further determine the reasons for their non-evacuation in order to implement precise monitoring strategies and improve evacuation efficiency.

[0031] S4. If there are villagers who have not been evacuated in the management grid, determine the status of the villagers who have not been evacuated, and implement the monitoring strategy according to the status of the villagers who have not been evacuated. The monitoring strategy includes assigning patrol personnel to the nearest location in the management grid or inserting targeted reminder information into the nearest emergency broadcasting device that is playing evacuation information based on the residential location information of the villagers who have not been evacuated.

[0032] Specifically, the process for determining the status of villagers who have not yet been evacuated is as follows: 1. Determine if the villagers who have not yet evacuated are key individuals (e.g., elderly people with mobility issues, key assistance recipients, etc.). If they are key individuals, the villagers who have not yet evacuated are at home and require assistance to evacuate. In this case, a rapid response is needed, arranging for nearby patrol personnel to go to their homes to assist with the evacuation. Specifically, obtain the location information of each patrol personnel within the management grid, and send a rescue dispatch instruction to the patrol personnel in the management grid who are closest to the residence of the villager who has not yet evacuated, guiding the patrol personnel to their residence to assist with the evacuation. 2. If the person is not a key person of concern, continue to determine whether the villager who has not been evacuated is not in the village. If he is not in the village, the status of the villager who has not been evacuated is that he does not need to be evacuated. Understandably, for those who have already gone out to work, checking whether there are lights on in their residences at night can help exclude them from the list, improving the efficiency of emergency evacuation resources (e.g., door-to-door reminders, broadcast announcements, etc.). The specific process for determining whether villagers who have not evacuated are not in the village is as follows: Based on the location of the residences of the villagers who have not been evacuated, the monitoring equipment closest to the residences is called up to obtain the monitoring images during the nighttime period before the emergency broadcast equipment starts playing evacuation information. The changes in the lighting at the residences in the monitoring images are analyzed. If there are changes in the lighting at the residences during the nighttime period, it is determined that the villagers who have not been evacuated are still in the village. If the lighting at the residential location does not change during the nighttime period, it is determined that the villagers who have not been evacuated are not in the village.

[0033] For villagers who are not in the village, they can be highlighted and marked as people who have left the village in the village management list, and a confirmation message can be sent to the patrol personnel in their management grid. The patrol personnel can further inquire via SMS. If no confirmation reply is received within a certain period of time, they can make a final visit to confirm after they have helped evacuate other villagers.

[0034] 3. If the location is in a village, then continue to determine whether any remaining villagers are inside their residences: The specific process for determining whether villagers who have not evacuated are still in their residences is as follows: Based on the location of the residences of the villagers who have not been evacuated, the monitoring and audio equipment covering the residential area closest to the residences are called up to obtain the monitoring images within the first preset time period before the emergency broadcast equipment starts playing the evacuation information. The monitoring images are analyzed to see if people enter or leave the residences and whether the audio equipment can collect the human voice characteristics inside the residences. If the surveillance footage does not show any people entering or leaving the residence but the audio equipment can capture human voice characteristics, or if the surveillance footage identifies people entering the residence but does not detect anyone leaving the residence, then it is determined that the evacuated villager is currently in their residence.

[0035] 4. If the villagers who have not been evacuated are in their residences, then the status of the villagers who have not been evacuated is that they are at home but have not been evacuated; Generate and execute the first broadcast instruction: send a targeted evacuation notification message containing the villager's personal information to the emergency broadcast device closest to the villager's residence, and notify via SMS or telephone, while monitoring in real time whether any unevacuated villagers are captured on camera in the exit areas of each management grid; after issuing the targeted evacuation notification, continue to perform multi-node identification through monitoring devices near the villager's residence, monitoring points in the management grid exit areas, and monitoring devices in the safe assembly area; if the villager is recorded in the first or second villager information table, it means that the villager has arrived at the safe assembly area or is en route, and the villager is marked as evacuated or in the process of evacuation; to avoid situations where villagers are at home but do not respond to the targeted evacuation notification, and their evacuation is not monitored after the second preset time window (e.g., two minutes after the evacuation notification is issued), the status is upgraded, and nearby patrol personnel need to be arranged to remind them at home.

[0036] 5. If a villager who has not evacuated is not determined to be temporarily away from their residence, their status will be "awaiting confirmation of evacuation." To prevent some villagers from going out to farm or run errands, a second broadcast command will be generated and executed to intermittently broadcast targeted evacuation notification messages containing their personal information to emergency broadcast devices in the target village, and to monitor in real time whether any villagers who have not evacuated are photographed in the exit areas of each management grid.

[0037] S6. To facilitate the display of the evacuation completion status of villagers in each management grid, the status of evacuated, evacuating, and non-evacuated villagers, as well as the location and status of rescue resources, can be displayed through a visual interface based on the evacuation completion status of each villager in the villager information management list and the real-time location of the current inspection personnel, providing real-time situational awareness for command and decision-making.

[0038] Example 2 This embodiment provides an emergency evacuation monitoring device based on an emergency broadcast system, including a memory, a processor, and a computer program stored in the memory and executable on the processor. The feature is that when the processor executes the computer program, it implements the emergency evacuation monitoring method based on an emergency broadcast system described in Embodiment 1.

[0039] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Based on the technical essence of the present invention, any simple modifications, equivalent substitutions, and improvements made to the above embodiments within the spirit and principles of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An emergency evacuation monitoring method based on an emergency broadcasting system, characterized in that, Specifically, the following steps are included: S1. Obtain the residential locations of each household in the target village within the area to be evacuated, the village road network, the location of the safe assembly area, and the deployment locations of each emergency broadcasting and monitoring device in the target village. S2. Based on the residential location of each villager, the location of the safe collection area, and the village road network, the target village is divided into multiple management grids through spatial clustering and graph partitioning algorithms. Each emergency broadcasting device and monitoring device is then associated with each management grid according to its deployment location. S3. Obtain the real-time monitoring video stream transmitted by the monitoring equipment located in the exit area of ​​each management grid, identify the villagers in the monitoring video stream, and analyze the villagers' evacuation completion status within the preset time window after the emergency broadcast equipment starts playing evacuation information in each management grid. S4. If there are villagers who have not been evacuated in the management grid, determine the status of the villagers who have not been evacuated, and implement the monitoring strategy according to the status of the villagers who have not been evacuated. The monitoring strategy includes assigning patrol personnel to the nearest location in the management grid or inserting targeted reminder information into the nearest emergency broadcasting device that is playing evacuation information based on the residential location information of the villagers who have not been evacuated.

2. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 1, characterized in that, The village road network consists of multiple intersecting village roads. Based on road width and whether they connect to county roads, each village road is divided into main roads and branch roads / lanes. Main roads located on the pre-determined evacuation routes are marked as evacuation routes according to the pre-defined evacuation routes determined in the drills. The specific process of dividing multiple management grids in step S2 is as follows: The village road network is constructed with the location of each villager's residence as the node and the village road connecting each residence as the edge. A clustering algorithm based on road network constraints is used to divide the village road network into multiple management grids. Each management grid must contain an evacuation main road, and each household in each management grid can return to the evacuation main road through the shortest branch road. Each management grid is numbered based on its distance from the safe assembly area, and an exit area is determined for each management grid, which must include the evacuation route.

3. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 2, characterized in that, The specific process of dividing the village road network is as follows: S01. Randomly select k nodes in the village road network as the initial central nodes, and mark the location of the evacuation main road closest to the central node as the central road; S02. For each non-central node, calculate the straight-line distance from the non-central node to each central node and the shortest path distance from the non-central node to each central node along the village road network through the central road. S03. Calculate the weighted sum of the straight-line distance and the shortest path distance to obtain the comprehensive distance; S04. Compare the combined distances from non-central nodes to each central node, and assign the non-central nodes to the cluster containing the central node with the closest combined distance. S05. For each cluster, traverse all nodes within the cluster and try to use each node as the new center node. Calculate the sum of the comprehensive distances from all nodes in the cluster to the new center node if the new center node is taken as the center. Select the node with the smallest sum of comprehensive distances as the updated center node. S06. Repeat step S05 above until the central nodes of all clusters are no longer updated, and divide the nodes and village road sections contained in each cluster into a management grid.

4. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 2, characterized in that, The specific process for identifying and analyzing the completion status of villager evacuation within the management grid is as follows: The system acquires real-time surveillance video streams transmitted from the safe collection area, identifies villagers in the surveillance video streams, and stores the identified villager information in the first villager information table. The monitoring video streams transmitted back by the monitoring equipment located in the exit area of ​​each management grid are identified, and the identified villager information is stored in the second villager information table. Obtain the villager management list that records information about each household in the target village, and cross-match the first villager information table, the second villager information table, and the villager management list. Finally, mark the evacuation completion status of each villager in the villager management list.

5. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 4, characterized in that, The specific process for marking the completion status of evacuation for each villager is as follows: The villager information in the first villager information table is traversed and matched with the villager management list. The villager information that is successfully matched is marked as evacuated in the villager management list. The second villager information table is matched with the first villager information table. If there is villager information in the second villager information table that cannot be matched with the first villager information table, then the villager information is marked as a villager being evacuated in the villager management list. Match the villager management list with the second villager information table, and mark the villagers in the villager management list who cannot be matched in the second villager information table and who are not marked as evacuated villagers as not evacuated villagers.

6. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 1, characterized in that, The process of determining the status of villagers who have not yet been evacuated is as follows: Determine whether the villagers who have not been evacuated are key individuals to watch out for. If they are key individuals to watch out for, then the status of the villagers who have not been evacuated is that they are at home and need assistance to evacuate. If they are not key personnel to be monitored, then continue to determine whether the villagers who have not been evacuated are not in the village. If the villagers are not in the village, then the status of the villagers who have not been evacuated is that they do not need to be evacuated. If it is in a village, then continue to determine whether the villagers who have not been evacuated are inside their residences; If a villager who has not been evacuated is inside their residence, then the status of the villager who has not been evacuated is "at home but not evacuated"; If it is determined that the villagers who have not evacuated are temporarily away from their residences, then the status of the villagers who have not evacuated is "awaiting evacuation status".

7. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 6, characterized in that, The specific process for implementing monitoring strategies based on the status of villagers who have not yet been evacuated is as follows: When a villager who has not been evacuated is at home and needs assistance to evacuate, a rescue dispatch instruction is sent to the patrol personnel in the management grid that is closest to the villager who has not been evacuated, guiding the patrol personnel to their residence to assist in the evacuation. When a villager who has not evacuated is in the status of being at home but not evacuated, the first broadcast instruction is generated and executed: a targeted evacuation notification message containing the villager's personal information is sent to the emergency broadcast device closest to the villager's residence, and the exit areas of each management grid are monitored in real time to see whether any villager who has not evacuated is captured on camera; When the status of the villagers who have not been evacuated is "awaiting confirmation of evacuation", a second broadcast command is generated and executed to intermittently broadcast targeted evacuation notification messages containing their personal information to each emergency broadcasting device in the target village, and to monitor in real time whether any villagers who have not been evacuated are photographed in the exit areas of each management grid.

8. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 6, characterized in that, The specific process for determining whether villagers who have not been evacuated are no longer in the village is as follows: Based on the location of the residences of the villagers who have not been evacuated, the monitoring equipment closest to the residences is called up to obtain the monitoring images during the nighttime period before the emergency broadcast equipment starts playing evacuation information. The changes in the lighting at the residences in the monitoring images are analyzed. If there are changes in the lighting at the residences during the nighttime period, it is determined that the villagers who have not been evacuated are still in the village. If the lighting at the residential location does not change during the nighttime period, it is determined that the villagers who have not been evacuated are not in the village.

9. The emergency evacuation monitoring method based on an emergency broadcasting system according to claim 6, characterized in that, The specific process for determining whether villagers who have not evacuated are still in their residences is as follows: Based on the location of the residences of the villagers who have not been evacuated, the monitoring and audio equipment covering the residential area closest to the residences are called up to obtain the monitoring images within the first preset time period before the emergency broadcast equipment starts playing the evacuation information. The monitoring images are analyzed to see if people enter or leave the residences and whether the audio equipment can collect the human voice characteristics inside the residences. If the surveillance footage does not show any people entering or leaving the residence but the audio equipment can capture human voice characteristics, or if the surveillance footage identifies people entering the residence but does not detect anyone leaving the residence, then it is determined that the evacuated villager is currently in their residence.

10. An emergency evacuation monitoring device based on an emergency broadcast system, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements an emergency evacuation monitoring method based on an emergency broadcast system as described in any one of claims 1-9.

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