System and method for measuring distribution density of fragments on facade of building in real time at night

Abstract

The invention discloses a system and a method for measuring the distribution density of fragments on the facade of a building in real time at night, and solves the problems of non-uniform illumination, difficulty in protection and high layout cost caused by the fact that a plurality of light sources are adopted to provide illumination for each building in an existing experiment for measuring the distribution density of the fragments on the facade of the building at night. The system comprises a light-emitting unit, an image acquisition unit, a communication unit and a calculation control unit, the light-emitting unit is used for being arranged in a to-be-detected area on the vertical face of a building so as to be damaged by fragment groups. The image acquisition unit is used for being arranged in a safe area near the building, and the action end of the image acquisition unit corresponds to the light-emitting unit; the communication unit is respectively connected with the image acquisition unit and the calculation control unit and is used for transmitting image data acquired by the image acquisition unit to the calculation control unit in real time; and the calculation control unit is arranged in the remote test room and is used for controlling the image acquisition unit and calculating the fragment distribution density according to the acquired image data.

Description

Technical Field

[0001] The present invention relates to a fragment distribution density measurement system and method, and in particular to a nighttime real-time measurement system and method for the fragment distribution density of a building facade. Background Art

[0002] In order to detect the destructive effects of fragment groups in various environments, some fragment damage experiments are carried out at night. The core damage parameters of fragments include flight speed, distribution density, and damage range. How to measure the distribution density of fragments on the facade of a building at night is one of the urgent problems to be solved in fragment damage experiments. Currently, the commonly used methods for measuring fragment distribution density are manual target detection or image target detection. However, such methods are only applicable to daytime conditions with sufficient lighting conditions, and the real-time measurement performance is poor, and it is impossible to quickly provide fragment distribution density data. Due to the large distribution distance between buildings, it is difficult to use a unified light source to provide lighting for all buildings at night. If multiple light sources are used to provide lighting for each building separately, there will be problems such as uneven lighting, difficult protection, and high deployment costs.

[0003] Currently, various types of dynamic destruction experiments have increasingly higher requirements for the real-time acquisition of experimental data. The existing post-target detection method not only increases the experimental time cost, but also reduces the number of experiments within the effective time. Therefore, it is necessary to solve the problem of real-time transmission and rapid identification of fragment hole images. Summary of the Invention

[0004] In order to solve the technical problems that in the existing night-time measurement of the distribution density of fragments on the facade of a building, multiple light sources are used to provide lighting for each building separately, resulting in uneven lighting, difficult protection, high deployment costs, and poor real-time acquisition of experimental data, the present invention provides a system and method for real-time measurement of the distribution density of fragments on the facade of a building at night.

[0005] The inventive concept of the present invention:

[0006] The present invention adopts electroluminescent film as the nighttime imaging medium of fragment holes, utilizes 4G network to transmit fragment hole images in real time, and uses intelligent algorithms to quickly identify fragment holes, thereby realizing real-time measurement of fragment distribution density under low illumination conditions at night.

[0007] Electroluminescent film is a material that emits uniform light when energized. Localized perforations in the film cause the corresponding area to lose its ability to emit light. High-contrast images of fragment holes can be captured at night using a standard camera, making it a promising candidate for measuring fragment density at night. Applying a layer of self-luminous film to the area of a building to be measured eliminates the need for artificial light sources.

[0008] Network technology enables real-time transmission of fragment hole images. However, deploying a wired network in the experimental area is time-consuming, labor-intensive, and difficult to secure. Using 4G wireless network technology to transmit images not only reduces construction costs but also allows for flexible adjustment of the number of measurement points based on the number of buildings. With the development of artificial intelligence (AI), rapid image target recognition has become widely used, and this technology can be used to quickly identify fragment holes in images.

[0009] In order to achieve the above objectives and complete the above invention concept, the present invention adopts the following technical solutions:

[0010] A nighttime real-time measurement system for building facade fragment density distribution, which is special in that:

[0011] It includes a light emitting unit, an image acquisition unit, a communication unit and a calculation control unit;

[0012] The light emitting unit is used to be arranged in a test area on the facade of a building to receive damage from a group of fragments;

[0013] The image acquisition unit is used to be arranged in a safe area near the building, and its active end corresponds to the light-emitting unit;

[0014] The communication unit is connected to the image acquisition unit and the calculation control unit respectively, and is used to transmit the image data acquired by the image acquisition unit to the calculation control unit in real time;

[0015] The calculation control unit is arranged in the remote test room, and is used to control the image acquisition unit and calculate the fragment distribution density according to the acquired image data.

[0016] Furthermore, the light-emitting unit is an electroluminescent film.

[0017] Furthermore, the light emitting unit and the image acquisition unit include multiple ones, and are correspondingly distributed on different facades of the same building, or on facades of different buildings, and each image acquisition unit is connected to the calculation control unit via a communication unit.

[0018] Furthermore, the image acquisition unit includes a pan-tilt head arranged in a safe area near the building, a camera arranged on the pan-tilt head, a power supply battery connected to the camera, and a wireless communication module connected to the camera;

[0019] The active end of the camera corresponds to the light-emitting unit;

[0020] The wireless communication module is connected to the calculation control unit via a communication unit.

[0021] Furthermore, a network relay is provided on the connection line between the power supply battery and the camera;

[0022] The network relay is connected to the calculation control unit via a communication unit.

[0023] Furthermore, the communication unit is a network base station provided near the remote test room;

[0024] The network base station is connected to the calculation control unit via an optical fiber.

[0025] Furthermore, the image acquisition unit further includes a protective box;

[0026] The pan / tilt head, camera, power supply battery, wireless communication module and network relay are all arranged in a protective box;

[0027] The protective box is provided with a light window;

[0028] The light window corresponds to the electroluminescent film;

[0029] The active end of the camera corresponds to the light window.

[0030] Furthermore, the light window is made of bulletproof glass;

[0031] A shock-absorbing partition is provided at the bottom of the platform.

[0032] Furthermore, the calculation control unit is a computer;

[0033] The wireless communication module is a 4G wireless communication module;

[0034] The network base station is a 4G network base station.

[0035] A method for measuring the density of fragments distributed on a building facade at night in real time is provided, which uses the above-mentioned system for measuring the density of fragments distributed on a building facade at night in real time. The method comprises the following steps:

[0036] Step 1: Arrange light-emitting units on the area to be tested on the facade of the building;

[0037] Step 2: deploying an image acquisition unit in a safe area near the building, with its active end corresponding to the light-emitting unit;

[0038] Step 3: Deploy a communication unit and connect the image acquisition unit and the calculation control unit through the communication unit;

[0039] Step 4: The image acquisition unit is started by the computing control unit, and the image acquisition unit acquires image data of the light-emitting unit in real time and transmits the image data to the computing control unit in real time through the communication unit;

[0040] Step 5: The calculation control unit identifies the non-illuminated area in the luminous unit from the acquired image data, and then calculates the fragment distribution density to complete the real-time measurement of the fragment distribution density of the building facade at night.

[0041] Beneficial effects of the present invention:

[0042] 1. The nighttime real-time measurement system and method for building facade fragment distribution density proposed in the present invention provides good lighting conditions for nighttime imaging of fragment holes, thereby improving nighttime measurement accuracy.

[0043] Traditional fragment distribution density measurement methods are only applicable during the day. Visible light imaging equipment cannot effectively capture image data of fragment holes under low illumination conditions at night. This invention uses a light-emitting unit as the measurement medium, leveraging its properties to facilitate nighttime fragment hole identification and achieve accurate nighttime measurement of fragment distribution density.

[0044] 2. The present invention uses electroluminescent film as a measuring medium, which reduces the measurement cost.

[0045] The electroluminescent film has uniform self-luminous ability and loses its luminous ability at the location of the fragment perforation, allowing visible light imaging equipment to capture images with a bright background and high contrast at the bullet hole location at night, providing excellent lighting conditions for nighttime identification of fragment holes.

[0046] 3. The nighttime real-time measurement system and method for the density of fragment distribution on a building facade of the present invention can obtain fragment hole image data on the building facade in real time.

[0047] Traditional fragment hole data collection relies on post-target detection, which suffers from poor real-time performance. This invention uses an image acquisition unit to acquire fragment hole image data. The unit's protective housing effectively protects the camera, power supply battery, and wireless communication module. The wireless communication module enables online, real-time transmission of image data, making the measurement system's fragment image data collection more timely.

[0048] 4. The nighttime real-time measurement system and method for building facade fragment distribution density proposed by the present invention can automatically calculate the distribution density of fragments.

[0049] Traditional fragment hole image processing systems require image acquisition, image input, and image recognition to determine fragment distribution density. This results in a lack of coherence between intermediate steps and a long delay in outputting results. The present invention utilizes a remote computer control unit to calculate fragment hole distribution density. Simply pre-setting the size parameters of the electroluminescent film, launching a camera with a single button to capture image data, identifying fragment holes based on the captured image data, and then calculating distribution density. Fragment distribution density data can be output within seconds, significantly improving the efficiency of fragment distribution density calculations.

[0050] 5. The nighttime real-time measurement system and method for building facade fragment distribution density proposed by the present invention can simultaneously obtain fragment hole distribution density data of multiple building facades in batches.

[0051] Traditional post-target detection methods can only collect fragment distribution data for each building facade sequentially, and lack the ability to perform real-time batch processing for multiple buildings simultaneously. The present invention achieves distributed collection of fragment hole image data on building facades by distributing the light-emitting units and image acquisition units, thereby enabling batch and real-time collection of fragment hole image data. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 This is a schematic structural diagram of an embodiment of a nighttime real-time measurement system for building facade fragment distribution density according to the present invention;

[0053] Figure 2 This is a flow chart of an embodiment of a method for real-time nighttime measurement of building facade fragment distribution density according to the present invention;

[0054] Figure 3 This is a fragment hole identification effect diagram in an embodiment of a method for real-time nighttime measurement of building facade fragment distribution density according to the present invention.

[0055] Figure Number:

[0056] 1-Building, 2-Electroluminescent film, 3-Pan-tilt head, 4-Camera, 5-Power supply battery, 6-Wireless communication module, 7-4G network base station, 8-Computer, 9-Protective box. DETAILED DESCRIPTION

[0057] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the accompanying drawings and embodiments. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0058] The embodiment of the present invention provides a nighttime real-time measurement system for the distribution density of building facade fragments, such as Figure 1 As shown, the nighttime real-time measurement system includes a light-emitting unit, an image acquisition unit, a communication unit and a calculation control unit.

[0059] In this embodiment, the light-emitting unit adopts an electroluminescent film 2. The electroluminescent film 2 is a material that has the ability to emit light when powered. When it is partially penetrated by fragments, the corresponding position will lose its luminous ability, and can generate a high-contrast fragment hole distribution image at night.

[0060] The image acquisition unit can capture and transmit fragment hole image data generated by the electroluminescent film in real time. The image acquisition unit includes a pan / tilt head 3, located in a safe area near the building 1; a camera 4 mounted on the pan / tilt head 3; a power supply battery 5 connected to the camera 4 via a network relay; a wireless communication module 6 connected to the camera 4; and a protective housing 9. The pan / tilt head 3, camera 4, power supply battery 5, wireless communication module 6, and network relay are all housed within the protective housing 9, which has a bulletproof glass window corresponding to the electroluminescent film 2. The camera 4 is a spherical network camera, with its active end corresponding to the window. The power supply battery 5 is a lithium battery. The spherical network camera is responsible for capturing fragment hole image data. The azimuth and pitch angles of the camera 4 lens can be adjusted via the pan / tilt head 3 to achieve an optimal imaging field of view. The wireless communication module 6 is a 4G wireless communication module that can exchange data with a 4G network base station 7 in real time via wireless signals. The network relay receives on / off commands from a computer 8 and, based on these commands, turns the camera 4 on or off, thereby reducing power consumption during non-measurement periods and increasing the image acquisition unit's battery life. The lithium battery can power the image acquisition unit. The protective box 9 protects the submodules within the image acquisition unit from damage by shock waves and fragments. It is a fully enclosed structure, with bulletproof glass embedded in the front providing an optical window for the camera 4, and a built-in shock-absorbing baffle at the bottom to reduce vibration caused by shock waves.

[0061] In this embodiment, the electroluminescent film 2 and image acquisition units are multiple and distributed on different facades of the same building 1, or on the facades of different buildings 1. Each image acquisition unit is connected to the computer 8 via a communication unit. This enables distributed acquisition of fragment hole image data on building facades, and further enables batch and real-time acquisition of fragment hole image data.

[0062] The communication unit is a 4G network base station 7 located near the remote test room; it is connected to a computer 8 via optical fiber. The 4G network base station 7 bridges the gap between the image acquisition unit and the computer 8, exchanging data with multiple distributed image acquisition units via wireless signals and with the computer 8 via optical fiber.

[0063] The computer 8 can send instructions to the distributed image acquisition unit via the 4G network base station 7 and calculate the fragment hole distribution density of the electroluminescent film coverage area in real time.

[0064] like Figure 2 As shown in Figure 2, the workflow of the above-mentioned nighttime real-time measurement system under field experimental conditions is as follows:

[0065] Step 1: Lay out the electroluminescent film.

[0066] According to the preset flight direction of the fragment group, the test area is selected on the bullet-facing surface of the facade of building 1. The specific location of the test area is marked with a ruler and a marker. Dust and stains on the surface of the test area are cleaned until the surface is flat and smooth. An electroluminescent film of the same size is adhered to the test area.

[0067] Step 2: Arrange the image acquisition unit.

[0068] Place the image acquisition unit on the ground facing the building facade, with the bulletproof glass side of the image acquisition unit's protective box 9 facing the area to be measured. Install the camera 4, wireless communication module 6, network relay, and lithium battery inside the protective box 9 and connect the circuits between them. After the circuits are connected, build a layer of bricks around the outer perimeter of the protective box 9 to further enhance its protective capabilities. Repeat the above two steps for multiple image acquisition units distributed across multiple buildings.

[0069] Step 3: Deploy 4G network base station 7. Install 4G network base station 7 in a secure area outside building 1. Connect 4G network base station 7 to computer 8 via optical fiber. Use an optical fiber switch to connect computer 8 to the network in the remote test room. Start computer 8 and check the online status of the image acquisition unit, network relay control, and image transmission for normal operation. Use the network relay to connect power to camera 4 and electroluminescent film 2. Check that electroluminescent film 2 emits uniform light. Use pan / tilt / tilt 3 to adjust the pitch and azimuth angles of camera 4's lens until electroluminescent film 2 is centered. Disconnect power to camera 4 to conserve lithium battery power.

[0070] Step 4: Pre-experimental preparation. One hour before the experiment, use computer 8 to control the network relays of the image acquisition units to close. Check that each electroluminescent film 2 is centered within the field of view of camera 4. If the angle deviates, fine-tune it using pan / tilt platform 3. Open computer 8 to set parameters, sequentially inputting the width and height of the electroluminescent film 2 for each image acquisition unit.

[0071] After the experiment begins, the fragments that hit the test area will penetrate the electroluminescent film 2 and form a perforation on the electroluminescent film 2. The image acquisition unit collects the image data of the light-emitting unit in real time and transmits it to the calculation control unit in real time through the communication unit.

[0072] Step 5: Combine Figure 3 As shown, the computer 8 performs the following operations based on the identification of non-luminous areas in the luminous unit in the image data: film fragment hole image capture, film corner pixel point identification, image perspective transformation, film pixel area subtraction, fragment hole identification and labeling, fragment hole number statistics, and fragment distribution density calculation.

[0073] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention shall be covered by the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A nighttime real-time measurement system for building facade fragment distribution density, characterized by: It includes a light emitting unit, an image acquisition unit, a communication unit and a calculation control unit; The light emitting unit is used to be arranged in a test area on the facade of a building (1) to receive damage from a group of fragments; The image acquisition unit is used to be arranged in a safe area near the building (1), and its active end corresponds to the light-emitting unit; The communication unit is connected to the image acquisition unit and the calculation control unit respectively, and is used to transmit the image data acquired by the image acquisition unit to the calculation control unit in real time; The calculation control unit is arranged in the remote test room, and is used to control the image acquisition unit and calculate the fragment distribution density according to the acquired image data.

2. The nighttime real-time measurement system for building facade fragment distribution density according to claim 1 is characterized by: The light-emitting unit is an electroluminescent film (2).

3. The nighttime real-time measurement system for building facade fragment distribution density according to claim 1 or 2, characterized in that: The light-emitting units and image acquisition units include a plurality of units, which are correspondingly distributed on different facades of the same building (1), or on facades of different buildings (1), and each image acquisition unit is connected to the calculation control unit via a communication unit.

4. The nighttime real-time measurement system for building facade fragment distribution density according to claim 3 is characterized by: The image acquisition unit comprises a pan-tilt head (3) arranged in a safe area near the building (1), a camera (4) arranged on the pan-tilt head (3), a power supply battery (5) connected to the camera (4), and a wireless communication module (6) connected to the camera (4); The active end of the camera (4) corresponds to the light-emitting unit; The wireless communication module (6) is connected to the calculation control unit via a communication unit.

5. The nighttime real-time measurement system for building facade fragment distribution density according to claim 4 is characterized by: A network relay is provided on the connection line between the power supply battery (5) and the camera (4); The network relay is connected to the calculation control unit via a communication unit.

6. The nighttime real-time measurement system for building facade fragment distribution density according to claim 5, characterized in that: The communication unit is a network base station arranged near the remote test room; The network base station is connected to the calculation control unit via an optical fiber.

7. The nighttime real-time measurement system for building facade fragment distribution density according to claim 6, characterized in that: The image acquisition unit further includes a protective box (9); The pan / tilt platform (3), camera (4), power supply battery (5), wireless communication module (6), and network relay are all arranged in a protective box (9); The protective box (9) is provided with a light window; The light window corresponds to the electroluminescent film (2); The active end of the camera (4) corresponds to the light window.

8. The nighttime real-time measurement system for building facade fragment distribution density according to claim 7, characterized in that: The light window is made of bulletproof glass; A shock-absorbing partition is provided at the bottom of the platform (3).

9. The nighttime real-time measurement system for building facade fragment distribution density according to claim 7, characterized in that: The calculation control unit is a computer (8); The wireless communication module (6) is a 4G wireless communication module; The network base station is a 4G network base station (7).

10. A method for measuring the density of fragments distributed on a building facade at night in real time, using the system for measuring the density of fragments distributed on a building facade at night according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Arrange light-emitting units on the area to be tested on the facade of the building (1); Step 2: Arrange an image acquisition unit in a safe area near the building (1), and place its active end in correspondence with the light-emitting unit; Step 3: Deploy a communication unit and connect the image acquisition unit and the calculation control unit through the communication unit; Step 4: The image acquisition unit is started by the computing control unit, and the image acquisition unit acquires image data of the light-emitting unit in real time and transmits the image data to the computing control unit in real time through the communication unit; Step 5: The calculation control unit identifies the non-illuminated area in the luminous unit from the acquired image data, and then calculates the fragment distribution density to complete the real-time measurement of the fragment distribution density of the building facade at night.

Images