Fire-fighting hidden danger accurate investigation and evacuation optimization method and system for old community

Abstract

This invention discloses a method and system for accurate fire hazard investigation and evacuation optimization in old residential communities, involving the fields of fire safety management, image recognition, and emergency evacuation technology. It addresses the problem that existing investigations, which mainly rely on the net width of passageways or the area of ​​obstacles, struggle to identify obstructed landing, step-changing, turning, and starting spaces at stair landings. This method acquires data from the stair landing area, determines the gait connection benchmark for personnel evacuation, generates landing buffer zones, identifies the spatial occupancy relationship between physical obstacles and landing buffer zones, generates gait continuity attenuation values, and outputs hazard investigation or evacuation optimization results. This improves the accuracy of hazard level assessment, rectification priority determination, and evacuation capacity correction.

Description

Technical Field

[0001] This application relates to the fields of fire safety management, image recognition and emergency evacuation technology, and in particular to a method and system for accurate investigation and evacuation optimization of fire hazards in old residential communities. Background Technology

[0002] Residents often temporarily place items such as cardboard boxes, old furniture, strollers, folding bikes, miscellaneous bags, and electric vehicle parts in stairwells in their daily lives. Older residential areas, often built earlier, commonly feature smaller stair landings, insufficient corner spaces, inconsistent tread sizes, and limited evacuation routes. These items, while not necessarily completely blocking passageways, can impede people's footing, stepping, turning, and starting movements on stair landings, especially in emergency evacuation scenarios like fires, easily causing localized pauses and congestion.

[0003] Current methods for identifying fire hazards typically rely on manual inspections, image recognition, or video monitoring. The criteria for judgment are usually based on whether there are objects piled up on the stair landing, whether the passageway is blocked, whether the remaining clear width of the landing meets the requirements, or whether the area of ​​the obstacle exceeds the threshold. While these methods can detect the presence of obstacles on the stair landing, they mainly focus on the entire landing or the overall passageway, making it difficult to further identify whether the obstacle is located at a critical position connecting the evacuation routes. For example, even if the overall clear width of the landing still meets the requirements for single-person passage, if the obstacle is located at the foot of a person entering the landing from the previous staircase, or at the starting point of a person stepping from the landing onto the next staircase, it will still force people to slow down, turn sideways, or readjust their gait.

[0004] Therefore, the existing technology has at least the following shortcomings: First, it mainly evaluates potential hazards based on the net width of the platform or the area occupied by obstacles, which makes it difficult to reflect the actual impact of obstacles on landing, changing steps, turning, or starting actions; Second, it is difficult to establish a correspondence between the location of obstacles in the stair platform and the gait connection process of personnel evacuation, resulting in the failure to accurately identify the obstruction of continuous evacuation actions at the platform; Third, it lacks a quantitative evaluation basis based on the degree of space occupation in gait connection, which can easily lead to inaccurate judgment of fire hazard level, determination of rectification priority, and correction of evacuation passage capacity. Summary of the Invention

[0005] This application provides a method and system for accurate fire hazard investigation and evacuation optimization in old residential communities. It can determine the gait connection benchmark related to the evacuation gait connection based on the data of the stair platform area, generate a landing buffer zone, identify the spatial occupancy relationship of physical obstacles relative to the landing buffer zone, and generate a gait continuity attenuation value accordingly, thereby improving the accuracy of fire hazard level judgment and evacuation passage capacity correction at the stair platform.

[0006] On the one hand, a method for precise fire hazard investigation and evacuation optimization in old residential communities is provided. The method includes: acquiring regional data of a target stair landing area, which includes a stair landing and stair sections connected to the stair landing; determining gait connection benchmarks related to pedestrian evacuation gait in the target stair landing area based on the regional data, wherein the gait connection benchmarks include step edges, stair landing boundaries, connection boundaries between adjacent stair sections and the stair landing, or baselines determined by the above structures; generating a landing buffer zone based on the gait connection benchmarks, wherein the landing buffer zone characterizes the space range required for pedestrians to complete landing, step changing, turning, or starting actions in the target stair landing area; identifying physical obstacles in the target stair landing area and determining the spatial occupancy relationship of the physical obstacles relative to the landing buffer zone, wherein the spatial occupancy relationship includes at least one of overlapping state, overlapping area, overlapping ratio, overlapping position, or occupancy projection contour; generating a gait continuity attenuation value based on the degree of encroachment characterized by the spatial occupancy relationship; and outputting at least fire hazard investigation results based on the gait continuity attenuation value, and outputting evacuation optimization results when the evacuation topology is obtained.

[0007] In one possible implementation, the area data includes image data that has been scaled or processed by planar mapping, and / or includes depth data, point cloud data, or spatial measurement data. Fire hazard detection equipment can collect raw data using cameras, depth cameras, lidar, mobile inspection terminals installed in stairwells, or inspection robots equipped with the aforementioned data collection devices, and perform at least one of the following processing on the raw data: distortion correction, perspective correction, scale conversion, or planar mapping.

[0008] In one possible implementation, the gait connection reference includes the edge of the step, the boundary of the stair platform, the connection boundary between the adjacent stair section and the stair platform, and a reference line or virtual reference line for the platform travel direction. The reference line for the platform travel direction can be determined by at least two points, namely the intersection of the personnel evacuation downhill direction and the boundary of the stair platform, the center point of the entrance area on the receiving side, and the center point of the exit area on the starting side. The virtual reference line can be a line segment parallel to the edge of the step and at a preset distance from the edge of the step, or a line segment passing through the expected landing center point of the personnel and perpendicular to the personnel evacuation downhill direction.

[0009] In one possible implementation, where the gait connection reference includes the edge of the last step and the edge of the first step, the landing buffer includes a receiving landing buffer and a starting landing buffer. The landing buffer zone represents the landing space required for a person to enter the stair platform from the previous staircase, and the starting landing buffer zone represents the starting space required for a person to enter the next staircase from the stair platform.

[0010] In one possible implementation, the method further includes generating a gait transition zone, which characterizes the continuous step-changing area of ​​a person moving from a receiving footing buffer zone to a starting footing buffer zone within the stair platform.

[0011] In one possible implementation, the spatial occupancy relationship includes at least one of the following: the overlap state, overlap area, overlap ratio, overlap position, or occupancy projection outline between the physical obstacle and the landing buffer zone; the fire hazard investigation equipment can determine the landing buffer zone occupancy rate based on the overlap area and use the landing buffer zone occupancy rate as the degree of occupancy represented by the spatial occupancy relationship.

[0012] In one possible implementation, the gait continuity decay value can be generated based on the landing buffer occupancy rate; When the landing buffer zone includes the receiving landing buffer zone, the starting landing buffer zone, and the gait transition zone, the gait continuity decay value can be generated by weighting the receiving encroachment rate, the starting encroachment rate, and the transition encroachment rate.

[0013] On the other hand, a system for accurate fire hazard investigation and evacuation optimization in old residential communities is provided, including a processor and a memory. The memory stores a computer program, which is loaded and executed by the processor to implement the above method.

[0014] The solution provided in this application does not determine the level of fire hazard solely based on the presence of obstacles on the stair platform, the remaining net width of the platform, or the area of ​​the obstacles. Instead, it generates a footing buffer zone based on the gait connection benchmark related to the gait connection of personnel evacuation, and generates a gait continuity attenuation value based on the spatial occupancy relationship of physical obstacles relative to the footing buffer zone. This enables the identification of hazard states where the platform as a whole is still passable but personnel's footing, step-changing, turning, or starting actions are blocked, thereby improving the accuracy of fire hazard investigation and evacuation optimization at stair platforms in old residential areas. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an implementation environment provided in an embodiment of this application; Figure 2 This is a flowchart of a method for accurate fire hazard investigation and evacuation optimization in old residential communities, provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a target stair platform area provided in an embodiment of this application; Figure 4 This is a schematic diagram of a landing buffer zone, a starting landing buffer zone, and a gait transition zone provided in an embodiment of this application; Figure 5This is a schematic diagram illustrating the overlap between the projected outline of an obstacle and the landing buffer zone, provided in an embodiment of this application. Figure 6 This is a schematic diagram of a system structure for accurate fire hazard investigation and evacuation optimization in old residential communities, provided in an embodiment of this application. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings. It should be noted that the embodiments of this application are mainly aimed at the accurate investigation and evacuation optimization of fire hazards in the stairwell platform area of ​​old residential communities, and are especially applicable to scenarios where there are physical obstacles in the stairwell platform that affect people's footing, stepping, turning or starting actions.

[0017] It is understood that the terms “first”, “second”, etc., used in this application may be used to describe various concepts, but unless otherwise stated, these concepts are not limited by these terms; these terms are only used to distinguish one concept from another; for example, without departing from the scope of this application, the first overlapping area may be referred to as the second overlapping area, and similarly, the second overlapping area may be referred to as the first overlapping area.

[0018] "At least one" refers to one or more types of data; for example, at least one type of regional data can be image data, depth data, or point cloud data, or it can be two or three of them. "At least two" means two or more. For example, "at least two candidate structural boundaries" can be two candidate structural boundaries, three candidate structural boundaries, or more candidate structural boundaries.

[0019] In this application embodiment, a physical obstacle refers to a physical object located on or adjacent to the passage plane in the target stair platform area, which occupies space for people to step on, change steps, turn, or start. The adjacent passage plane can be the space range in which the height difference between the lowest point, bottom projection, or occupied projection of the physical object and the passage plane is less than or equal to a preset height threshold. The preset height threshold is used to exclude wall markings, shadows, or hanging objects that do not affect people's stepping on, changing steps, turning, or starting.

[0020] In this application embodiment, the obstacle occupancy projection contour refers to the boundary of the occupancy projection area of ​​a physical obstacle in the travel plane coordinate system. When depth data or point cloud data can be obtained, the obstacle occupancy projection contour can be determined by the bottom contour point set of the physical obstacle that is in contact with or adjacent to the travel plane. When only image data can be obtained, the obstacle occupancy projection contour can be determined by the bottom contour point set of the physical obstacle or the occupancy projection point set after planar mapping.

[0021] The spatial occupancy relationship in this application embodiment refers to the spatial encroachment state of a physical obstacle relative to the landing buffer zone, including at least one of the following: overlap state, overlap area, overlap ratio, overlap position, or occupancy projection outline between the physical obstacle and the landing buffer zone. The obstacle type can be used as an additional factor in determining the hazard level or rectification priority, but it is not a necessary element of the spatial occupancy relationship.

[0022] In this application embodiment, the gait connection reference refers to a spatial reference used to generate a footing buffer zone and characterize a person's footing, step-changing, turning, or starting actions within a stair landing. The gait connection reference may include the edge of a step, the boundary of a stair landing, the connection boundary between adjacent stair sections and stair landings, or a reference line determined by the aforementioned structural features.

[0023] See Figure 1 The implementation environment of this application embodiment may include a fire hazard investigation device 101 and a data acquisition device 102. The fire hazard investigation device 101 and the data acquisition device 102 are connected through a wired network or a wireless network. The fire hazard investigation device 101 may be at least one of a server, an edge computing device, a property inspection terminal, a community fire management terminal, or an inspection robot. The data acquisition device 102 may be a camera, a depth camera, a lidar, a mobile inspection terminal, or an inspection robot equipped with the above-mentioned acquisition device installed in the stairwell.

[0024] The data acquisition device 102 is used to collect raw data of the target stair platform area and send the raw data to the fire hazard investigation device 101. The fire hazard investigation device 101 is used to generate regional data based on the raw data, determine the gait connection benchmark, generate the landing buffer, identify the spatial occupancy relationship of physical obstacles relative to the landing buffer, calculate the gait continuity attenuation value, and output the fire hazard investigation results and / or evacuation optimization results.

[0025] The fire hazard investigation equipment 101 can also be connected to the property management platform 103, the community fire management platform 104, or the emergency evacuation guidance equipment 105. The fire hazard investigation results output by the fire hazard investigation equipment 101 can be used to generate rectification work orders, and the output evacuation optimization results can be used to generate evacuation detour prompts, floor diversion prompts, or key area early warning prompts.

[0026] See Figure 2 The method for accurate fire hazard investigation and evacuation optimization in old residential communities provided in this application embodiment can be executed by fire hazard investigation equipment; the method includes steps 201 to 212.

[0027] Step 201: The fire hazard inspection equipment acquires regional data of the target stair landing area; See Figure 3 The target stair landing area refers to the stair landing and its connecting areas in the stairwell of old residential buildings that need to be inspected for fire hazards; the target stair landing area includes the stair landing, the upper staircase connected to the stair landing, and the lower staircase connected to the stair landing; the upper staircase refers to the stair section that people pass through before entering the stair landing in the direction of evacuation; the lower staircase refers to the stair section that people enter after leaving the stair landing in the direction of evacuation.

[0028] The regional data includes image data that has been scaled or processed by planar mapping, and / or includes depth data, point cloud data or spatial measurement data; the fire hazard investigation equipment can extract the target area containing the stair landing and the stair section connected to the stair landing from the raw data, and perform at least one of the following processing on the target area: distortion removal, perspective correction, scale conversion or planar mapping, to obtain the regional data.

[0029] Step 202: The fire hazard investigation equipment establishes a traffic plane coordinate system corresponding to the target stair platform area based on regional data; The passage plane coordinate system is a two-dimensional coordinate system used to represent the position of structural points, step edge points, footing buffer zones, and the projected outline of obstacles within the stair platform. The fire hazard detection equipment can identify at least one structural feature among the stair platform boundary, wall boundary, stair handrail boundary, step edge line, or ground boundary line in the area data, fit or determine the plane where the stair platform is located based on the structural features, and determine the plane where the stair platform is located as the passage plane.

[0030] Step 203: Establish a planar mapping relationship for the fire hazard investigation equipment when only image data is available; When the regional data is a monocular image, the processor can identify at least two sets of structural edge lines located in the plane of the stair platform and with different directions, such as the edge line of the step, the boundary line of the platform, or the edge line of the floor tile. Based on the pre-stored or on-site calibrated step width, floor tile side length, door frame width, or handrail size, it can establish a homography transformation relationship from the image coordinates to the travel plane coordinate system. Thus, the step edge points, obstacle occupancy projection points, and footing buffer zone boundary points can all be transformed into the same travel plane coordinate system.

[0031] Step 204: Use fire hazard inspection equipment to determine the downward evacuation direction for personnel; The direction of personnel evacuation downwards can be determined by the floor passage direction pre-recorded in the building space ledger; it can also be determined by the decreasing direction of the height value corresponding to the edge of the adjacent step; it can also be determined by the perspective arrangement relationship of the step edge in the image; if it cannot be determined automatically, it can also be determined by manual selection or confirmation instructions received by the inspection terminal.

[0032] Step 205: Determine the gait connection benchmark for fire hazard inspection equipment; Fire hazard detection equipment can identify candidate structural boundaries in the target stair landing area. Candidate structural boundaries include candidate step edges, stair landing boundaries, or connection boundaries between adjacent stair sections and stair landings. Based on the downward direction of personnel evacuation, the fire hazard detection equipment determines at least one structural boundary from the candidate structural boundaries that is related to personnel entering, leaving, or changing steps within the stair landing, and uses the at least one structural boundary, or the baseline determined by the at least one structural boundary, as the gait connection baseline.

[0033] In one possible implementation, the gait connection reference can be the edge of the step; specifically, the fire hazard detection equipment determines the edge of the last step at the connection between the upper staircase and the staircase platform, and / or determines the edge of the first step at the connection between the staircase platform and the lower staircase, based on the intersection relationship, distance relationship, height change relationship, or perspective arrangement relationship between the candidate step edges and the staircase platform boundary; the edge of the last step is the last step edge that personnel pass before entering the staircase platform in the downward direction of personnel evacuation, and the edge of the first step is the first step edge that personnel pass when leaving the staircase platform and entering the next staircase in the downward direction of personnel evacuation, such as... Figure 3 As shown.

[0034] In another possible implementation, the gait connection reference can be a platform travel direction reference line or a virtual reference line. The platform travel direction reference line can be determined by at least two points: the intersection of the personnel evacuation downhill direction and the boundary of the stair platform, the center point of the receiving side entrance area, and the center point of the starting side exit area. The virtual reference line can be a line segment parallel to the edge of the candidate step and at a preset distance from the edge of the candidate step, or a line segment passing through the expected landing point of the personnel and perpendicular to the personnel evacuation downhill direction. Using this method, even if the edge of the step is partially obscured in the image, the gait connection reference can still be determined based on the identifiable stair platform boundary or the connection relationship between adjacent stair sections.

[0035] Step 206: The fire hazard detection equipment generates a landing buffer zone based on gait connection benchmarks; See Figure 4 The landing buffer zone is used to characterize the space required for a person to complete landing, step change, turn or start action in the target stair platform area; the fire hazard detection equipment can use the gait connection benchmark as the boundary benchmark to determine the normal direction towards the inside of the stair platform or away from the adjacent stair section, extend a preset distance along the normal direction, and expand the preset width along the extension direction of the gait connection benchmark to generate the landing buffer zone.

[0036] In one possible implementation, where the gait transition reference includes the edge of the last step and the edge of the first step, the landing buffer zone includes a receiving landing buffer zone and a starting landing buffer zone, such as... Figure 4 As shown; the landing buffer zone represents the landing space required for personnel when entering the stair landing from the previous staircase; the starting landing buffer zone represents the starting space required for personnel when entering the next staircase from the stair landing.

[0037] Step 207: The fire hazard detection equipment can generate gait connection strips; The fire hazard detection equipment determines the center point of the receiving landing buffer zone and the center point of the starting landing buffer zone, and connects the center points of the receiving landing buffer zone and the starting landing buffer zone to obtain the gait connection direction line; with the gait connection direction line as the center line, and extending to both sides according to the preset gait connection width, a gait connection zone is generated; the gait connection zone is used to characterize the continuous step change area when a person moves from the receiving landing buffer zone to the starting landing buffer zone in the stair platform.

[0038] Step 208: The fire hazard inspection equipment identifies physical obstacles and determines the projected outline occupied by the obstacles; Fire hazard detection equipment performs target detection or segmentation on regional data to obtain obstacle regions that include obstacle categories, obstacle location boxes, or obstacle pixel masks. Target segmentation can be achieved using color-based, edge-based, depth-based, semantic segmentation models, or manually labeled templates. Target detection can be achieved using pre-trained targets, detection models, or detection algorithms based on obstacle contour features.

[0039] See Figure 5 The fire hazard detection equipment determines the occupancy projection contour of the physical obstacle on the corresponding passage plane in the target stair platform area based on the obstacle area. In cases where depth data or point cloud data can be obtained, the obstacle occupancy projection contour can be determined based on the obstacle bottom contour point set or the passage plane projection point set. In cases where only image data can be obtained, the obstacle bottom contour point set or occupancy projection point set can be converted to the passage plane coordinate system based on the plane mapping relationship established in step 203.

[0040] Step 209: Determine the spatial occupancy relationship of fire hazard inspection equipment; Spatial occupancy relationships include at least one of the following: overlap state, overlap area, overlap ratio, overlap position, or occupancy projection profile between physical obstacles and landing buffer zones; such as... Figure 5As shown, the fire hazard detection equipment can calculate the first overlapping area between the projected outline of the obstacle and the landing buffer zone, and determine the ratio of the first overlapping area to the area of ​​the landing buffer zone as the landing encroachment rate; calculate the second overlapping area between the projected outline of the obstacle and the starting landing buffer zone, and determine the ratio of the second overlapping area to the area of ​​the starting landing buffer zone as the starting encroachment rate; calculate the third overlapping area between the projected outline of the obstacle and the gait connection zone, and determine the ratio of the third overlapping area to the area of ​​the gait connection zone as the connection encroachment rate.

[0041] Step 210: The fire hazard detection equipment generates gait continuity attenuation values ​​based on the degree of encroachment represented by the spatial occupancy relationship; Gait continuity decay value is used to characterize the degree to which physical obstacles hinder people from continuously descending stairs, landing, changing steps, turning, or starting at a stair landing. The larger the gait continuity decay value, the easier it is for people's continuous evacuation actions at the stair landing to be interrupted.

[0042] In one possible implementation, when only one landing buffer is generated, the landing buffer occupancy rate can be directly used as the gait continuity attenuation value, or the gait continuity attenuation value can be generated according to the following relationship: S = R × μ × ν; where S represents the gait continuity attenuation value, R represents the landing buffer occupancy rate, μ represents the obstacle type correction coefficient, and ν represents the obstacle position correction coefficient; μ and ν are both preset coefficients greater than 0; the obstacle type correction coefficient can be determined according to whether the obstacle is a hard, movable, protruding, or tripping object; the obstacle position correction coefficient can be determined according to whether the obstacle is located in the center area, edge area, entrance key area, or exit key area of ​​the buffer.

[0043] In another possible implementation, when the landing buffer zone includes a receiving landing buffer zone, a starting landing buffer zone, and a gait transition zone, the gait continuity decay value S satisfies the following relationship: S=(αA+βB+γC) / (α+β+γ); Where S represents the gait continuity decay value, A represents the takeover rate, B represents the start rate, C represents the connection rate, α represents the takeover weight, β represents the start weight, and γ represents the connection weight, and α, β, and γ are all greater than or equal to 0, and α+β+γ>0; A, B, and C are all values ​​between 0 and 1. The occupancy rate A can be expressed as A = A1 / A0, where A1 represents the first overlapping area between the obstacle's occupancy projection outline and the landing buffer zone, and A0 represents the area of ​​the landing buffer zone. The starting encroachment rate B can be expressed as B = B1 / B0, where B1 represents the second overlap area between the obstacle's projected outline and the starting landing buffer zone, and B0 represents the area of ​​the starting landing buffer zone. The occupancy rate C can be expressed as C=C1 / C0, where C1 represents the third overlap area between the obstacle-occupied projected profile and the gait connection zone, and C0 represents the area of ​​the gait connection zone.

[0044] Step 211: The fire hazard detection equipment outputs the fire hazard detection results based on the gait continuity attenuation value; Fire hazard detection equipment can compare gait continuity attenuation values ​​with preset hazard thresholds and determine the fire hazard level of the target stair landing area based on the comparison results. The fire hazard detection results can include at least one of the following: hazard location, type of encroached landing buffer zone, landing buffer zone encroachment rate, obstacle type, and rectification priority.

[0045] Step 212: Given the evacuation topology; The fire hazard detection equipment outputs evacuation optimization results based on gait continuity attenuation values. The evacuation topology includes nodes and edges. Nodes represent stair landings, stair end points, floor exits, or unit doors, while edges represent the passable connections between adjacent nodes. The target stair landing area can be mapped to the target node or edge in the evacuation topology based on the building number, unit number, floor number, and platform coordinates. The corrected passage weight W' satisfies the following relationship: W' = W × (1 + λS). Where W' represents the corrected passage weight, W represents the original passage weight, λ represents the weight correction coefficient, and S represents the gait continuity attenuation value, where λ is a value greater than or equal to 0. When S is 0, W' = W; as S increases, the passage weight of the node or edge corresponding to the target stair landing area increases.

[0046] In this embodiment, the preset distance, preset width, preset gait connection width, preset distance threshold, preset height threshold, first preset hazard threshold, second preset hazard threshold, obstacle type correction coefficient, obstacle position correction coefficient, and weight correction coefficient can be determined by the system default configuration, management terminal configuration, historical inspection data statistics, or fire management requirements. The above parameters are not limited to fixed values, as long as they can be used to distinguish different degrees of encroachment on the landing space within the target stair platform area.

[0047] For example, the length of a person's foot can be 0.24 meters to 0.30 meters, the step-changing distance can be 0.20 meters to 0.50 meters, and the safety margin can be 0.05 meters to 0.20 meters; the fire hazard detection equipment can determine the sum of the person's foot length, step-changing distance, and safety margin as the preset distance; the person's shoulder width can be 0.40 meters to 0.60 meters, and the lateral avoidance margin can be 0.05 meters to 0.20 meters; the fire hazard detection equipment can determine the preset width or preset gait connection width based on the person's shoulder width and lateral avoidance margin.

[0048] For buildings with a high proportion of elderly people, children, people carrying babies, or people with mobility impairments, the management can increase the safety margin or lateral avoidance margin to expand the range of the landing buffer zone or gait connection zone; for buildings with narrow stair platforms, the preset gait connection width can be set to a preset proportion not exceeding the net width of the stair platform to avoid the buffer zone exceeding the actual platform range.

[0049] See Figure 6 This application embodiment also provides a fire hazard detection and evacuation optimization system 600 for old residential communities; the system includes a processor 604 and a memory 603, the memory 603 stores a computer program, the computer program is loaded and executed by the processor 604 to implement any of the above method steps.

[0050] In one possible implementation, the system may further include a data acquisition device 601, a communication device 602, and a display device 605; the data acquisition device 601 is used to acquire raw data of the target stair landing area; the communication device 602 is used to transmit data between the data acquisition device 601, the processor 604, the property management platform, or the emergency evacuation guidance equipment; and the display device 605 is used to display the results of fire hazard investigation, the type of encroached landing buffer zone, the landing buffer zone encroachment rate, the rectification priority, or the evacuation optimization results.

[0051] This application does not limit the system deployment method. As long as the processor can execute the computer program in the memory and realize regional data acquisition, gait connection benchmark determination, footing buffer generation, physical obstacle recognition, space occupancy relationship determination, gait continuity decay value generation and result output, it is acceptable.

[0052] The technical solution provided in this application further refines the assessment of fire hazards at stairwell platforms in old residential areas from the existence of obstacles and whether the remaining net width of the platform meets the requirements to physical obstacles and whether they encroach on the landing buffer zone required for continuous evacuation of personnel. Since the landing buffer zone is generated based on gait connection benchmarks, it can more accurately reflect the impact of obstacles on personnel's landing, step changing, turning and starting actions.

[0053] By determining the spatial occupancy relationship between physical obstacles and landing buffer zones, and generating gait continuity decay values, quantitative basis can be provided for fire hazard level assessment, rectification priority determination, and evacuation topology weight correction, thereby improving the reliability of accurate fire hazard investigation and evacuation optimization in old residential communities.

[0054] It should be understood that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them; those skilled in the art can combine, replace or adjust the technical features in the above embodiments, as long as they do not depart from the spirit and scope of the technical solutions of this application, they should all be included within the protection scope of this application.

Claims

1. A fire-fighting hidden danger precise investigation and evacuation optimization method for old and dilapidated communities, characterized in that, The method includes: Acquire regional data of the target stair platform area, wherein the target stair platform area includes the stair platform and the stair section connected to the stair platform; Based on the regional data, gait connection benchmarks related to pedestrian evacuation gait connections are determined in the target stair platform area. The gait connection benchmarks include the edge of the step, the boundary of the stair platform, the connection boundary between the adjacent stair section and the stair platform, or the benchmark line determined by the above structures. A landing buffer zone is generated based on the gait connection benchmark. The landing buffer zone is used to characterize the spatial range required for a person to complete landing, step changing, turning or starting actions in the target stair platform area. Identify physical obstacles within the target stair platform area and determine the spatial occupancy relationship of the physical obstacles relative to the footing buffer zone. The spatial occupancy relationship includes at least one of the following: overlap state, overlap area, overlap ratio, overlap position, or occupancy projection outline. A gait continuity attenuation value is generated based on the degree of encroachment represented by the space occupancy relationship. The gait continuity attenuation value is used to characterize the degree to which the physical obstacle hinders the continuous evacuation movement of personnel in the target stair platform area. Based on the gait continuity decay value, at least the fire hazard investigation results should be output, and if the evacuation topology is obtained, the evacuation optimization results should be output.

2. The method of claim 1, wherein, The region data includes image data that has been scaled or processed by planar mapping, and / or includes depth data, point cloud data or spatial measurement data; The acquisition of regional data for the target stair platform area includes: Raw data of the target stair platform area is collected by cameras, depth cameras, lidar, mobile inspection terminals, or inspection robots equipped with the above-mentioned data collection devices installed in the stairwell. Extract a target area from the original data that includes the stair landing and the stair section connected to the stair landing; The target region is subjected to at least one of the following processes: distortion correction, perspective correction, scale conversion, or planar mapping, to obtain the region data.

3. The method of claim 1, wherein, The determination of gait connection benchmarks related to pedestrian evacuation gait connections in the target stairwell area based on the regional data includes: The downward direction of personnel evacuation is determined based on the regional data; Identify candidate structural boundaries in the target stair platform area, including candidate step edges, stair platform boundaries, or connection boundaries between adjacent stair sections and the stair platform; Based on the downward direction of personnel evacuation, at least one structural boundary is determined from the candidate structural boundaries that is related to personnel entering the stair platform, leaving the stair platform, or changing steps and turning within the stair platform; The at least one structural boundary or the baseline defined by the at least one structural boundary is determined as the gait connection reference.

4. The method of claim 3, wherein, The baseline defined by the at least one structural boundary includes a platform travel direction baseline or a virtual baseline; The reference line for the passage direction of the platform is determined by at least two of the following points: the intersection of the personnel evacuation downward direction and the boundary of the stair platform, the center point of the entrance area on the receiving side, and the center point of the exit area on the starting side. The virtual baseline is a line segment that is parallel to the edge of the candidate step and at a preset distance from the edge of the candidate step, or a line segment that passes through the center point where the person is expected to land and is perpendicular to the downward direction of the evacuation.

5. The method of claim 3, wherein, The step of determining at least one structural boundary from the candidate structural boundaries that is related to personnel entering the stair landing, leaving the stair landing, or changing direction within the stair landing, based on the downward direction of personnel evacuation, includes: Based on the intersection relationship, distance relationship, height change relationship or perspective arrangement relationship between the candidate step edge and the stair platform boundary, determine the edge of the last step at the connection between the upper stair section and the stair platform, and / or determine the edge of the first step at the connection between the stair platform and the next stair section; The last step edge is the edge of the last step that a person passes before entering the stair platform along the downward direction of the evacuation, and the first step edge is the edge of the first step that a person passes when leaving the stair platform and entering the next section of stairs along the downward direction of the evacuation.

6. The method of claim 1, wherein, The step of generating a landing buffer zone based on the gait connection reference includes: Using the gait connection reference as the boundary reference, determine the normal direction toward the interior of the stair platform or away from the adjacent stair section; The landing buffer zone is generated by extending a preset distance along the normal direction and expanding a preset width along the extension direction of the gait connection reference. The preset distance is determined based on at least one of the following: the length of a person's foot, the step-changing distance, and the safety margin; the preset width is determined based on at least one of the following: the width of a person's shoulder, the width of the stair platform, and the lateral avoidance margin.

7. The method according to claim 5, characterized in that, When the gait connection reference includes the edge of the last step and the edge of the first step, the landing buffer includes a receiving landing buffer and a starting landing buffer; The step of generating a landing buffer zone based on the gait connection reference includes: The footing buffer is generated based on the edge of the last step, and the footing buffer is used to characterize the footing space required for a person to enter the stair platform from the previous staircase; The starting and landing buffer zone is generated based on the edge of the first step. The starting and landing buffer zone is used to represent the starting space required for a person to enter the next section of stairs from the stair platform.

8. The method according to claim 7, characterized in that, The method further includes: Determine the center point of the receiving landing buffer zone and the center point of the starting landing buffer zone; Connect the center point of the receiving landing buffer zone and the center point of the starting landing buffer zone to obtain the gait connection direction line; Using the gait connection direction line as the center line, and extending to both sides according to the preset gait connection width, a gait connection band is generated; The gait transition zone is used to characterize the continuous step-changing area when a person moves from the receiving footing buffer zone to the starting footing buffer zone within the stair platform.

9. The method according to any one of claims 1-8, characterized in that, The process of identifying physical obstacles within the target stair landing area and determining the spatial occupancy relationship of the physical obstacles relative to the footing buffer zone includes: Target detection or target segmentation is performed on the region data to obtain an obstacle region containing obstacle category, obstacle location box, or obstacle pixel mask; Based on the obstacle area, determine the occupancy projection outline of the physical obstacle on the passage plane corresponding to the target stair platform area; Calculate the overlap area between the occupied projection contour and the landing buffer zone; The landing buffer zone occupancy rate is determined based on the overlapping area, and the landing buffer zone occupancy rate is used as the degree of occupancy represented by the space occupancy relationship; The gait continuity decay value is generated based on the footing buffer occupancy rate.

10. A system for precise fire hazard identification and evacuation optimization in old residential communities, characterized in that, The method includes a processor and a memory, wherein the memory stores a computer program, which is loaded and executed by the processor to implement the method as described in any one of claims 1 to 9.

Images