Domestic combustible gas detector direct power supply camera shooting direct reading diaphragm gas meter linkage method

Abstract

The invention discloses a linkage method for a household combustible gas detector direct power supply camera shooting direct reading diaphragm type gas meter, and relates to the technical field of intelligent gas meters, the linkage method comprises the following specific steps: S100, hardware configuration: a micro camera module, an LED flash lamp device and a wireless communication module are arranged on a base meter of the diaphragm type gas meter, and the micro camera module, the LED flash lamp device and the wireless communication module are arranged on the base meter of the diaphragm type gas meter; according to the linkage method, the household combustible gas detector directly supplies power to the camera direct-reading module, the problems that the camera direct-reading module is high in power consumption and low in meter reading frequency are effectively solved, meter reading data are not updated in time due to the fact that a traditional camera direct-reading membrane type gas meter can only achieve low-frequency meter reading due to power consumption limitation, and the meter reading efficiency is greatly improved after the linkage method is adopted. The camera shooting direct-reading module can continuously and stably work, the platform end can freely select any time and frequency for meter reading, the timeliness and accuracy of meter reading data are greatly improved, and a more convenient and reliable gas use monitoring means is provided for users and management departments.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent gas meters, and in particular to a linkage method for a household combustible gas detector direct-powered camera direct-reading membrane gas meter. Background Art

[0002] In the field of smart home and gas safety monitoring, the camera direct-reading diaphragm gas meter is an innovative product that combines image recognition and wireless communication technology. It is equipped with a micro camera module and a wireless communication module to realize the remote intelligent meter reading function of the gas meter counter. However, although this technology has taken an important step in improving the efficiency and intelligence of meter reading, there are still a series of problems that need to be solved in practical applications.

[0003] Under the existing technical framework, the camera direct reading module of the film-type gas meter faces the challenge of high power consumption, which directly limits the increase in the frequency of meter reading. Due to the power consumption limitation, the camera direct reading module can only achieve low-frequency meter reading, which is not conducive to the timely update of meter reading data and is difficult to meet the user's demand for real-time gas usage. In addition, when the meter reading frequency is low, the wheel numbers may be in the alternating stage at the moment of taking a photo of the gas meter wheel, which will cause the wheel reading in the photo to be unable to be accurately identified, further affecting the accuracy and reliability of the meter reading data.

[0004] In addition, the video direct-reading diaphragm gas meter has significant functional shortcomings. Compared with other diaphragm gas meters based on photoelectric direct reading and Hall counting, the video direct-reading diaphragm gas meter cannot count in real time, and therefore cannot effectively monitor conditions such as small gas leaks and continuous abnormal flow. This defect not only weakens the safety monitoring capability of the gas meter, but also poses a potential threat to the gas safety of users.

[0005] Therefore, a linkage method for a household combustible gas detector directly powered by electricity and a camera direct-reading diaphragm gas meter was developed to improve the performance and function of the camera direct-reading diaphragm gas meter and better meet the needs of users for gas use and safety monitoring. Summary of the invention

[0006] The purpose of the present invention is to make up for the shortcomings of the prior art and provide a linkage method for a household combustible gas detector directly powered camera direct-reading diaphragm gas meter. It can power the camera direct-reading module through the household combustible gas detector, solving the problems of high power consumption, low meter reading frequency, inaccurate readings and inability to monitor gas leaks in real time of traditional camera direct-reading diaphragm gas meters. The technology uses a camera module to take a photo of the gas meter counter wheel, and sends it to the platform end for intelligent identification through a wireless communication module, thereby realizing remote meter reading and data update. At the same time, when a gas leak is detected, the detector can link the gas meter valve or the gas pipeline solenoid valve to close, ensuring the safety of gas use by users.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a linkage method of a household combustible gas detector directly powered by electricity and a direct-reading membrane gas meter, wherein the specific steps of the linkage method are:

[0008] S100, hardware configuration: a micro camera module, LED flash device and wireless communication module are equipped on the membrane gas meter base, and the household combustible gas detector is connected to the camera direct reading module through a wired connection to provide power and wired communication functions;

[0009] S200, power supply and communication: Use the household combustible gas detector to power the camera direct reading module, and establish a connection with the platform through the wireless communication module to realize gas detection data and meter reading data;

[0010] S300, direct camera reading: The direct camera reading module regularly takes photos of the gas meter counter wheel, uses image recognition technology to read the readings, and then uploads them to the platform through the wireless communication module. The platform reads the counter wheel readings based on this technology and performs statistics and analysis on the gas volume information data;

[0011] S400, linkage valve closing: When the combustible gas detector detects a gas leak, it immediately issues an audible and visual alarm, and closes the internal valve of the gas meter and the solenoid valve of the gas pipeline through a wired connection, while uploading the leakage data to the platform;

[0012] S500, remote monitoring and management: The platform receives and processes data from combustible gas detectors and gas meters, and provides remote monitoring, alarm notification, data analysis and emergency response functions.

[0013] Furthermore, in the S100, a diaphragm gas meter with space and conditions for installing additional equipment is selected, a miniature camera module with high-definition shooting capability is installed above the counter wheel, an LED flash device is installed near the module, a wireless communication module supporting remote data transmission is integrated into the gas meter, a camera direct reading module including an image processing unit and a control circuit is integrated into the gas meter, and connected to a household combustible gas detector through a wired connection, and a household combustible gas detector with a wired output function is selected and connected to the camera direct reading module through a dedicated cable.

[0014] Furthermore, in the S200, a wired connection is established between the household combustible gas detector and the camera direct reading module through a dedicated cable, the power input voltage and current are monitored in real time during the power supply process, a wireless communication module supporting the same communication protocol and standard is configured on the camera direct reading module and the household combustible gas detector, and a connection is established with the platform end, and the meter reading data and the gas concentration data of the household combustible gas detector are uploaded to the platform end through the wireless communication module.

[0015] Furthermore, in the S300, the platform sends a timed shooting instruction to the camera direct reading module according to the meter reading plan and real-time request. After the camera direct reading module responds, it controls the micro camera module to shoot the gas meter counter character wheel at the specified time. At the same time, the LED flash is activated to ensure the image clarity. After the photo is obtained, it is pre-processed and uploaded to the platform through the wireless communication module. The platform realizes character segmentation and recognition through the difference degree, verifies and corrects the readings, and uses the algorithm formula to perform statistical analysis on the gas volume information to identify the conditions of small gas leaks and continuous abnormal flow.

[0016] Furthermore, in S300, character segmentation and recognition are realized by difference degree. Assume that the segmented character image is a matrix I(x, y), where x and y represent the horizontal coordinate and the vertical coordinate of the image respectively. The energy function E of the character image is defined as follows: Calculate the centroid coordinates (x c ,y c ), the formula is: Calculate the edge strength S of the character image using the formula: in, Represents the gradient of the image at point (x, y). For each character to be recognized, calculate its feature vector F = [x c ,y c ,S], a character feature library is established in advance, which contains the feature vectors of known characters, and the difference D between the feature vector of the character to be recognized and the feature vector of each character in the character feature library is calculated. The formula is: in, is the feature vector of the kth character in the character feature library, and the character with the smallest difference is selected as the recognition result.

[0017] Furthermore, the specific steps of the reading verification and correction in S300 are:

[0018] (1) After completing character recognition, combine the digital characters in order to form a preliminary gas meter reading;

[0019] (2) The platform retrieves the last correct reading from the database as a benchmark for basic comparison, and marks the logical error as an exception for processing;

[0020] (3) For readings that pass the basic comparison, analyze the gas usage pattern based on the usage trend of historical data and the characteristics of a specific time period. If there is a significant deviation that cannot be reasonably explained, it is considered abnormal.

[0021] (4) Once an abnormal reading is found, re-photograph and identify. If it is still abnormal, notify the user to conduct on-site inspection and manually enter the correct reading in the system interface for verification;

[0022] (5) The user confirms the reading on site and submits it to the platform. The platform completes the verification and records the operations and results in detail throughout the process for subsequent analysis and optimization.

[0023] Furthermore, in the S300, a formula is used to identify a small gas leak. Assume that the identification of a small gas leak is mainly based on the difference in the change of gas volume within a certain period of time, L represents the possibility index of a small gas leak, ΔV represents the gas volume change value statistically calculated by the gas meter within the time interval t, and V avg Indicates the average gas consumption over a period of time. The formula is: Among them, k is a coefficient calibrated according to the actual situation. Its value range is determined by analyzing and experimenting on data of known small gas leaks and normal conditions. When L exceeds a certain threshold, it is judged that there is a small gas leak.

[0024] Furthermore, in S300, the formula is used to identify the condition of continuous abnormal flow. Let F represent the flow monitoring value, and the flow values ​​sampled multiple times within a period of time T are F1, F2, F3, ..., F n , A represents the average traffic baseline value, which is the average traffic value over a long period of time obtained based on historical normal traffic data statistics, and D represents the traffic difference threshold, which is a constant determined based on actual experience and research on the normal traffic fluctuation range. An indicator formula for judging continuous abnormal traffic is constructed: Where k is the calibration coefficient, and its value is determined by analyzing and experimenting with known normal and abnormal flow data. When I exceeds D, it is judged that there is continuous abnormal flow.

[0025] Furthermore, in the S400, the gas concentration is continuously monitored by the gas detector. Once it exceeds the preset safety threshold, the sound and light alarm device is triggered to alert the on-site personnel, and the leakage signal is transmitted to the platform end through the wireless communication module. After verification, the platform end enters the linkage valve closing process, automatically generates and sends instructions to the control unit of the internal valve of the gas meter and the solenoid valve of the gas pipeline, so that the valve is closed to cut off the gas supply.

[0026] Furthermore, in the S500, the data on the concentration of combustible gas and gas usage in the environment are collected in real time through the combustible gas detectors and gas meters arranged in the monitoring area, and the data is transmitted to the platform server through the wireless communication module. After receiving the data, the server performs integrity verification and timestamp marking. The platform generates a monitoring interface in real time to display key information and map positioning, presets safety thresholds, and automatically triggers an alarm and notifies the contact person when exceeded. After receiving the alarm information, the emergency response process is initiated, and a remote command interface is provided for remote intervention and guidance of emergency handling.

[0027] Compared with the prior art, the method for linking a household combustible gas detector with direct power supply, imaging and direct reading of a membrane gas meter has the following beneficial effects:

[0028] 1. The present invention directly powers the camera direct reading module through a household combustible gas detector, which effectively solves the problems of high power consumption and low meter reading frequency of the camera direct reading module. Due to power consumption limitations, traditional camera direct reading membrane gas meters can only achieve low-frequency meter reading, resulting in untimely update of meter reading data. After adopting the linkage method of the present invention, the camera direct reading module can work continuously and stably, and the platform end can freely choose any time and frequency to read the meter, which greatly improves the timeliness and accuracy of the meter reading data, and provides users and management departments with a more convenient and reliable means of monitoring gas usage.

[0029] 2. The present invention can monitor the indoor gas concentration in real time through the household combustible gas detector. Once the gas leakage is detected and reaches the alarm point, it will immediately sound and light alarm, and quickly close the internal valve of the gas meter and the solenoid valve on the gas pipeline through wired connection, effectively preventing the further spread of gas leakage and possible safety accidents. At the same time, through the wireless communication module, the gas leakage data will be uploaded to the platform in time, which provides strong support for subsequent troubleshooting and emergency processing, and further ensures the gas safety of users.

[0030] Other advantages, objectives and features of the present invention will be set forth in part in the following description and, in part, will be apparent to those skilled in the art based on an examination of the following or may be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a flow chart of a linkage method of a household combustible gas detector directly powered by electricity, imaging and direct reading membrane gas meter;

[0033] Figure 2 This is the linkage flow chart from household combustible equipment to diaphragm gas meter. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Embodiment 1:

[0036] A method for linking a household combustible gas detector with a direct-powered camera and direct-reading membrane gas meter, the method comprising the following steps: hardware configuration, power supply and communication, direct-reading by camera, linked valve closing, and remote monitoring and management.

[0037] First, enter the hardware configuration stage (S100), select a diaphragm gas meter with space and conditions for installing additional equipment, ensure that there is enough space to install subsequent equipment, install a micro camera module with high-definition shooting capability above the counter wheel of the gas meter, so as to clearly capture the counting wheel reading of the gas meter, install an LED flash device near the micro camera module to provide necessary auxiliary lighting for shooting, ensure that clear photos can be taken under different lighting conditions, integrate a wireless communication module that supports remote data transmission into the gas meter, so that the photos and data taken can be uploaded to the platform in time, integrate a camera direct reading module including an image processing unit and a control circuit into the gas meter, which is responsible for taking photos, processing images and extracting counting wheel readings, connect a household combustible gas detector to the camera direct reading module through a wired connection, select a household combustible gas detector with a wired output function, and achieve stable power supply and communication through a dedicated cable.

[0038] Next, enter the power supply and communication stage (S200), establish a wired connection between the household combustible gas detector and the camera direct reading module through a dedicated cable, provide the camera direct reading module with a stable operating voltage and current, ensure that the camera direct reading module can work continuously and stably, monitor the power input voltage and current in real time during the power supply process, ensure that the power supply quality meets the working requirements of the camera direct reading module, avoid equipment failures caused by voltage fluctuations and current instability, configure a wireless communication module that supports the same communication protocol and standard on the camera direct reading module and the household combustible gas detector, ensure that the two can smoothly transmit data, upload the meter reading data and the gas concentration data monitored by the household combustible gas detector to the platform end through the wireless communication module, realize remote transmission and real-time monitoring of data, the platform end receives the data from the camera direct reading module and the household combustible gas detector, and stores, analyzes and processes them for subsequent management and decision support.

[0039] Subsequently, the video direct reading stage (S300) is entered. According to the meter reading plan and real-time request, the platform sends a timed shooting instruction including shooting time and frequency parameters to the video direct reading module. After the video direct reading module responds, it controls the micro camera module to shoot the gas meter counter character wheel at the specified time. At the same time, the LED flash is activated to ensure the image clarity. After the shooting is completed, the acquired photos are pre-processed to improve the image quality. The processed photos and readings are uploaded to the platform through the wireless communication module. The platform implements character segmentation and recognition through the difference degree, verifies and corrects the recognized readings to ensure the accuracy of the data, and uses the algorithm formula to perform statistical analysis on the gas volume information, and identify the conditions of small gas leaks and continuous abnormal flow.

[0040] Then, the linkage valve closing stage (S400) is entered, and the gas concentration is continuously monitored through the household combustible gas detector. When the gas concentration is detected to exceed the preset safety threshold, the built-in sound and light alarm device is immediately triggered to alert the on-site personnel. The combustible gas detector transmits the leakage signal to the platform end through wireless communication. After the platform end receives the leakage signal, it verifies and confirms to ensure the accuracy and reliability of the signal. After the platform end verifies, it automatically generates and sends instructions to the control unit of the internal valve of the gas meter and the solenoid valve of the gas pipeline. After receiving the instruction, the control unit immediately executes the valve closing operation to cut off the gas supply and prevent the leakage from further expanding. While parsing and storing the leakage data, the platform end sends an emergency notice to the relevant parties according to the preset emergency response mechanism so that further response measures can be taken in time. After the valve is closed, the platform end continuously monitors the gas concentration to ensure that the leakage has been effectively controlled. At the same time, the platform end records the process data of the entire event to provide a basis for subsequent analysis and processing.

[0041] Finally, enter the remote monitoring and management stage (S500), deploy household combustible gas detectors and video direct-reading diaphragm gas meters in household gas usage areas, connect the combustible gas detectors to the video direct-reading modules and valves by wire, configure the platform server and set relevant parameters, the household combustible gas detectors collect real-time combustible gas concentration data in the environment, and the video direct-reading diaphragm gas meter takes photos and sends them to the platform after receiving the meter reading instructions. The platform receives the data for integrity verification, timestamp marking, generates a monitoring interface to display key information and positioning, and triggers an alarm mechanism when the data exceeds the safety threshold. When the combustible gas concentration exceeds the standard, the platform automatically sends an alarm message to the contact person, initiates the emergency response process to close the gas valve in conjunction, and provides a remote command interface. After the emergency handling is completed, the platform records the event details.

[0042] Through the construction and implementation process of the above-mentioned embodiments, a close linkage between the household combustible gas detector and the camera direct-reading diaphragm gas meter is achieved, which effectively improves the safety and convenience of household gas use.

[0043] Embodiment 2:

[0044] A method for linking a household combustible gas detector with a direct-powered camera and direct-reading membrane gas meter in this embodiment particularly emphasizes the direct-reading step, through which the meter reading data can be updated in a timely manner, the wheel reading can be accurately identified, and abnormal gas conditions can be monitored at the same time.

[0045] According to the preset meter reading plan and real-time data requests, the platform sends a timed shooting instruction containing shooting time and frequency parameters to the camera direct reading module. After receiving these instructions, the camera direct reading module will accurately control the micro camera module to take pictures of the gas meter counter wheel at the specified time. In order to ensure the clear quality of the captured image, the camera direct reading module will also activate the LED flash device to provide auxiliary lighting for shooting. After shooting, the camera direct reading module will pre-process the acquired photos, including but not limited to denoising and contrast enhancement, to improve the accuracy and efficiency of subsequent image processing, and upload them to the platform through the wireless communication module.

[0046] The platform uses the difference algorithm to achieve character segmentation and recognition. The segmented character image is assumed to be a matrix I(x, y), where x and y represent the horizontal and vertical coordinates of the image, respectively. The energy function E of the character image is defined as follows: Calculate the centroid coordinates (x c ,y c ), the formula is: Calculate the edge strength S of the character image using the formula: in, Represents the gradient of the image at the point (x, y). For each character to be recognized, its feature vector is calculated. A character feature library is pre-established, which contains the feature vectors of known characters. The difference D between the feature vector of the character to be recognized and the feature vector of each character in the character feature library is calculated. The formula is: in, is the feature vector of the kth character in the character feature library, and the character with the smallest difference is selected as the recognition result.

[0047] The readings are checked and corrected. After character recognition is completed, the digital characters are combined in sequence to form a preliminary gas meter reading. The platform retrieves the last correct reading from the database as a benchmark for basic comparison, and marks logical errors as abnormalities for processing. For readings that pass the basic comparison, the gas usage pattern is analyzed based on the usage trend of historical data and the characteristics of a specific time period. If there is a significant deviation and it cannot be reasonably explained, it is also considered an abnormality. Once an abnormal reading is found, it is re-photographed and identified. If it is still abnormal, the user is notified to conduct an on-site inspection and manually enter the correct reading in the system interface for verification. The user confirms the reading on site and submits it to the platform. The platform completes the verification and records the operations and results in detail throughout the process for subsequent analysis and optimization.

[0048] The formula is used to identify small gas leaks. Assume that the identification of small gas leaks is mainly based on the difference in gas volume changes within a certain period of time. L represents the possibility index of small gas leaks, ΔV represents the gas volume change value statistically calculated by the gas meter within the time interval t, and V avg Indicates the average gas consumption over a period of time. The formula is: Among them, k is a coefficient calibrated according to the actual situation. Its value range is determined by analyzing and experimenting on data of known small gas leaks and normal conditions. When L exceeds a certain threshold, it is judged that there is a small gas leak.

[0049] To identify the situation of continuous abnormal flow, let F represent the flow monitoring value, and the flow values ​​sampled multiple times within a period of time T are F1, F2, F3, …, F n , A represents the average traffic baseline value, which is the average traffic value over a long period of time obtained based on historical normal traffic data statistics, and D represents the traffic difference threshold, which is a constant determined based on actual experience and research on the normal traffic fluctuation range. An indicator formula for judging continuous abnormal traffic is constructed: Where k is the calibration coefficient, and its value is determined by analyzing and experimenting with known normal and abnormal flow data. When I exceeds D, it is judged that there is continuous abnormal flow.

[0050] In summary, through efficient image processing and data analysis technology, accurate reading of gas meter readings and timely detection and processing of abnormal situations are achieved.

[0051] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A method for linking a household combustible gas detector with a direct-powered camera and a direct-reading membrane gas meter, characterized in that: The specific steps of this linkage method are: S100, hardware configuration: a micro camera module, LED flash device and wireless communication module are equipped on the membrane gas meter base, and the household combustible gas detector is connected to the camera direct reading module through a wired connection to provide power and wired communication functions; S200, power supply and communication: Use the household combustible gas detector to power the camera direct reading module, and establish a connection with the platform through the wireless communication module to realize gas detection data and meter reading data; S300, direct camera reading: The direct camera reading module regularly takes photos of the gas meter counter wheel, uses image recognition technology to read the readings, and then uploads them to the platform through the wireless communication module. The platform reads the counter wheel readings based on this technology and performs statistics and analysis on the gas volume information data; S400, linkage valve closing: When the combustible gas detector detects a gas leak, it immediately issues an audible and visual alarm, and closes the internal valve of the gas meter and the solenoid valve of the gas pipeline through a wired connection, while uploading the leakage data to the platform; S500, remote monitoring and management: The platform receives and processes data from combustible gas detectors and gas meters, and provides remote monitoring, alarm notification, data analysis and emergency response functions.

2. According to claim 1, a method for linking a household combustible gas detector with direct power supply, imaging and direct reading of a membrane gas meter, characterized in that: In the S100, a diaphragm gas meter with space and conditions for installing additional equipment is selected, a miniature camera module with high-definition shooting capability is installed above the counter wheel, an LED flash device is installed near the module, a wireless communication module supporting remote data transmission is integrated into the gas meter, a camera direct reading module including an image processing unit and a control circuit is integrated into the gas meter, and is connected to a household combustible gas detector through a wired connection, and a household combustible gas detector with a wired output function is selected and connected to the camera direct reading module through a dedicated cable.

3. According to claim 1, a method for linking a household combustible gas detector with direct power supply, imaging and direct reading of a membrane gas meter, characterized in that: In the S200, a wired connection is established between the household combustible gas detector and the camera direct reading module through a dedicated cable, the power input voltage and current are monitored in real time during the power supply process, a wireless communication module supporting the same communication protocol and standard is configured on the camera direct reading module and the household combustible gas detector, and a connection is established with the platform end, and the meter reading data and the gas concentration data of the household combustible gas detector are uploaded to the platform end through the wireless communication module.

4. According to claim 1, a method for linking a household combustible gas detector with direct power supply, imaging and direct reading of a membrane gas meter, characterized in that: In the S300, the platform sends a timed shooting instruction to the camera direct reading module according to the meter reading plan and real-time request. After the camera direct reading module responds, it controls the micro camera module to shoot the gas meter counter character wheel at the specified time. At the same time, the LED flash is activated to ensure the image clarity. After the photo is obtained, it is pre-processed and uploaded to the platform through the wireless communication module. The platform implements character segmentation and recognition through the difference degree, verifies and corrects the readings, and uses the algorithm formula to perform statistical analysis on the gas volume information to identify the conditions of small gas leaks and continuous abnormal flow.

5. According to claim 4, a method for linking a household combustible gas detector with direct power supply, imaging and direct reading of a membrane gas meter, characterized in that: In the S300, character segmentation and recognition are realized by difference degree. The segmented character image is assumed to be a matrix I(x, y), where x and y represent the horizontal coordinate and the vertical coordinate of the image respectively. The energy function E of the character image is defined as follows: Calculate the centroid coordinates (x c ,y c ), the formula is: Calculate the edge strength S of the character image using the formula: in, Represents the gradient of the image at point (x, y). For each character to be recognized, calculate its feature vector F = [x c ,y c ,S], a character feature library is established in advance, which contains the feature vectors of known characters, and the difference D between the feature vector of the character to be recognized and the feature vector of each character in the character feature library is calculated. The formula is: in, is the feature vector of the kth character in the character feature library, and the character with the smallest difference is selected as the recognition result.

6. The linkage method of a household combustible gas detector directly powered by electricity, photographed and directly read membrane gas meter according to claim 4, characterized in that: The specific steps of reading verification and correction in S300 are: (1) After completing character recognition, combine the digital characters in order to form a preliminary gas meter reading; (2) The platform retrieves the last correct reading from the database as a benchmark for basic comparison, and marks the logical error as an exception for processing; (3) For readings that pass the basic comparison, analyze the gas usage pattern based on the usage trend of historical data and the characteristics of a specific time period. If there is a significant deviation that cannot be reasonably explained, it is considered abnormal. (4) Once an abnormal reading is found, re-photograph and identify. If it is still abnormal, notify the user to conduct on-site inspection and manually enter the correct reading in the system interface for verification; (5) The user confirms the reading on site and submits it to the platform. The platform completes the verification and records the operations and results in detail throughout the process for subsequent analysis and optimization.

7. The linkage method of a household combustible gas detector directly powered by electricity, photographed and directly read membrane gas meter according to claim 4, characterized in that: In the S300, a formula is used to identify a small gas leak. It is assumed that the identification of a small gas leak is mainly based on the difference in the change of gas volume within a certain period of time, L represents the possibility index of a small gas leak, ΔV represents the gas volume change value statistically calculated by the gas meter within the time interval t, and V avg Indicates the average gas consumption over a period of time. The formula is: Among them, k is a coefficient calibrated according to the actual situation. Its value range is determined by analyzing and experimenting on data of known small gas leaks and normal conditions. When L exceeds a certain threshold, it is judged that there is a small gas leak.

8. The linkage method of a household combustible gas detector directly powered by electricity, photographed and directly read membrane gas meter according to claim 4, characterized in that: In S300, the formula is used to identify the condition of continuous abnormal flow. Let F represent the flow monitoring value. The flow values ​​sampled multiple times within a period of time T are F1, F2, F3, ..., F n , A represents the average traffic baseline value, which is the average traffic value over a long period of time obtained based on historical normal traffic data statistics, and D represents the traffic difference threshold, which is a constant determined based on actual experience and research on the normal traffic fluctuation range. An indicator formula for judging continuous abnormal traffic is constructed: Where k is the calibration coefficient, and its value is determined by analyzing and experimenting with known normal and abnormal flow data. When I exceeds D, it is judged that there is continuous abnormal flow.

9. The linkage method of a household combustible gas detector directly powered by electricity, photographed and directly read membrane gas meter according to claim 1, characterized in that: In the S400, the gas concentration is continuously monitored by the gas detector. Once the preset safety threshold is exceeded, the sound and light alarm device is triggered to alert the on-site personnel, and the leakage signal is transmitted to the platform end through the wireless communication module. After verification, the platform end enters the linkage valve closing process, automatically generates and sends instructions to the control unit of the internal valve of the gas meter and the solenoid valve of the gas pipeline, so that the valve is closed to cut off the gas supply.

10. The linkage method of a household combustible gas detector directly powered by electricity, photographed and directly read membrane gas meter according to claim 1, characterized in that: In the S500, the combustible gas detectors and gas meters arranged in the monitoring area collect data on the combustible gas concentration and gas usage in the environment in real time, and transmit the data to the platform server through the wireless communication module. After receiving the data, the server performs integrity verification and timestamp marking. The platform generates a monitoring interface in real time to display key information and map positioning, presets safety thresholds, and automatically triggers an alarm and notifies the contact person when exceeded. After receiving the alarm information, the emergency response process is initiated, and a remote command interface is provided for remote intervention and guidance of emergency handling.

Images