Monitoring equipment of cable tunnel and monitoring method thereof

Abstract

The invention discloses cable tunnel monitoring equipment and a monitoring method thereof, and belongs to the technical field of monitoring video communication, the cable tunnel monitoring equipment comprises an access layer and a device layer, a data acquisition module is utilized to acquire the monitoring picture brightness and the environment illumination intensity of a cable tunnel in a current monitoring period transmitted and presented by the monitoring equipment, and the monitoring picture brightness and the environment illumination intensity are acquired; under the two conditions of overexposure of the monitoring picture and insufficient exposure of the monitoring picture, the brightness adjustment module is used for sequentially calculating and outputting an initial adjustment brightness value La, a brightness value Lb after secondary adjustment and a brightness value Lc after final adjustment, the brightness value Lc after adjustment is transmitted to the display control module, and the brightness of the monitoring picture displayed by the monitoring equipment is adjusted. And the error processing module is used for automatically adjusting the brightness adjustment amount LT. According to the invention, a dynamic adjustment mechanism, improvement of adjustment precision, full utilization of historical adjustment information and perfection of a brightness error processing mechanism are realized for transmission and presentation of a monitoring picture.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring video communication, and in particular to a monitoring device and a monitoring method for a cable tunnel. Background Art

[0002] In the field of surveillance video communications, especially for cable tunnel monitoring, it is crucial to ensure the clarity and effectiveness of the surveillance images. However, existing surveillance equipment and monitoring methods often rely on fixed brightness settings and simple brightness adjustment mechanisms. These mechanisms cannot be dynamically adjusted according to changes in ambient light intensity and the actual situation of the surveillance images. Therefore, in actual applications, the surveillance images are often too bright or too dark, which leads to poor monitoring effects and even the inability to effectively capture key information.

[0003] With respect to the above-mentioned and existing related technologies, the inventors believe that the following specific defects often exist: the existing monitoring equipment usually has monitoring screens that are too bright or too dark in environments where the light intensity varies greatly. Even if the existing monitoring equipment has a brightness adjustment function, its adjustment accuracy is often limited and cannot meet the needs of fine adjustment of the brightness of the monitoring screen, which causes the monitoring screen to lose information on certain details and affects the presentation and transmission effects of the monitoring screen. In addition, the existing monitoring equipment ignores the past adjustment history, which causes sudden jumps and instability in the brightness adjustment process of the monitoring screen, affecting the effectiveness and clarity of the monitoring of the monitoring screen. Finally, in the brightness adjustment process, errors will occur due to the influence of various factors, and the existing monitoring equipment and monitoring methods often lack an effective error handling mechanism and cannot correct and adjust the errors in a timely manner. Summary of the invention

[0004] The technical problem to be solved by the present invention is: the existing technology lacks a dynamic adjustment mechanism, the adjustment accuracy of the monitoring screen brightness is insufficient, the use of historical adjustment information is lacking, and the error processing mechanism is imperfect. For this reason, we propose a monitoring device and a monitoring method for a cable tunnel.

[0005] The technical solution is mainly: a monitoring device for a cable tunnel, including a main station layer, an access layer and a device layer, characterized in that: the main station layer includes a monitoring module, the access layer includes a brightness adjustment module, an error processing module and a display control module, and the device layer includes a data acquisition module. The specific monitoring steps are as follows: Step 1: using the data acquisition module to collect the brightness of the monitoring screen of the cable tunnel and the ambient light intensity in the current monitoring period transmitted and presented by the monitoring device, and transmitting an adjustment warning signal to the brightness adjustment module in the two cases where the monitoring screen is overexposed or underexposed; Step 2: Use the brightness adjustment module to calculate and output the initial brightness value La, the secondary adjusted brightness value Lb, and the final adjusted brightness value Lc in sequence, and transmit the adjusted brightness value Lc to the display control module to adjust the brightness of the monitoring screen presented by the monitoring device; Step 3: The brightness adjustment module provides the stored error times W and the preset error times W0, and uses the error processing module to automatically adjust the brightness adjustment amount LT; Step 4: the monitoring module monitors and receives the collection and adjustment information of the data collection module, the brightness adjustment module, the error processing module and the display control module; The brightness adjustment module includes an initial adjustment and monitoring brightness unit, a combined initial adjustment and history adjustment unit, and a comprehensive adjustment and feedback unit.

[0006] Preferably, the signal for adjusting the warning includes when the monitoring picture is overexposed, L0>Lq, and when the monitoring picture is underexposed, L0<Lq; Among them, L0 is the current brightness value and Lq is the expected brightness value.

[0007] Preferably, the calculation formula for the initial adjustment monitoring brightness unit is as follows: ; in: La is the initial brightness value; L0 is the current brightness value; LT is the brightness adjustment amount. LT reflects the automatic adjustment of the brightness increase or decrease of the monitoring screen in the current monitoring cycle. The details are as follows: When the monitoring image is overexposed, that is, the monitoring image is too bright, LT is a negative value to reduce the brightness; When the monitoring screen is underexposed, that is, the monitoring screen is too dark, LT is a positive value to increase the brightness; HG is the current ambient light intensity; HG max is the maximum value of ambient light intensity; Lq is the expected brightness value, which reflects the brightness level at which the monitoring images in the cable tunnel are clearly transmitted during the current monitoring cycle; Reflects the absolute difference between the current brightness and the expected brightness, and is used to adjust the brightness to approach the expected value.

[0008] Preferably, the calculation formula combining the initial adjustment and the historical adjustment unit is as follows: ; in: Lb is the brightness value after secondary adjustment; TZ is the number of brightness adjustments, which reflects the cumulative number of brightness adjustments made to the current cable tunnel in the current monitoring cycle due to overexposure and underexposure of the monitoring screen. TZ max The maximum number of brightness adjustments, TZ max Reflects the maximum number of brightness adjustments set by the monitoring equipment in the current monitoring cycle due to overexposure and underexposure of the monitoring screen of the current cable tunnel; L prev The brightness value after the last adjustment; is the normalized value of the historical adjustment times and is used to perform weighted adjustment on the initial brightness value La; It is the adjustment amount based on the historical adjustment trend and the current brightness, which is used to smooth the changes in excessive brightness and avoid sudden jumps in the monitoring image during transmission.

[0009] Preferably, the calculation formula of the comprehensive adjustment and feedback unit is as follows: ; in: Lc is the final adjusted brightness value; W is the number of errors, which reflects the cumulative number of times the current cable tunnel makes two consecutive brightness adjustments due to overexposure and underexposure of the monitoring screen in the current monitoring cycle. Two consecutive times indicates that there is still an error in the brightness of the last adjustment, thus triggering the second adjustment; W0 is the preset error number, which reflects the maximum degree set by the monitoring device for two consecutive brightness adjustments in the current monitoring cycle due to overexposure and underexposure of the monitoring screen in the current cable tunnel; is the adjustment amount based on the difference between the currently adjusted brightness and the expected brightness, and the error factor is introduced, where the error times W are used to reflect the error trend during the adjustment process; It is an adjustment based on the square of the difference between the previous adjustment and the current adjustment and is used to reduce over-adjustment.

[0010] Preferably, the final adjusted brightness value Lc calculated and output by the comprehensive adjustment and feedback unit will be used as the current brightness presentation adjustment of the monitoring device and transmitted to the display control module to complete the adjustment.

[0011] Preferably, based on the difference between the error number W and the preset error number W0, the brightness adjustment amount LT is automatically adjusted as follows: If W≤W0 in the current monitoring period, there is no need to automatically adjust the brightness adjustment amount LT; If W>W0 in the current monitoring cycle, the brightness adjustment amount LT is automatically adjusted. The specific adjustment calculation formula is as follows: When the monitoring screen is overexposed: ; When the monitoring screen is underexposed: ; in: LT new is the brightness adjustment amount after adjustment; L min is the minimum brightness value, L min Reflects the minimum brightness level at which the monitoring images in the cable tunnel can be clearly transmitted during the current monitoring cycle; L max is the maximum brightness value, L max Reflects the highest brightness level at which the monitoring images in the cable tunnel are clearly transmitted during the current monitoring cycle; The expected brightness value Lq is located at the minimum brightness value L min and the maximum brightness value L max The middle value between .

[0012] Preferably, the access layer is centered on the central control monitoring equipment of the power company's cable status monitoring main station, and is composed of a management platform for cable integrated monitoring equipment, including various servers, clients, and central monitoring equipment software and hardware equipment. The software and hardware equipment is responsible for the access, storage, calculation, presentation, analysis, diagnosis, and automatic adjustment of the application data of each application monitoring equipment of the monitoring equipment, and is responsible for uploading all data of the device layer and the access layer to the main station layer, and the main station layer includes a power transmission and transformation equipment monitoring main station; The equipment used at the device layer includes sensors, collectors, monitoring cameras, and fiber optic switches. The sensors are connected to the collectors, and the monitoring cameras are connected to the fiber optic switches. All data pass through the fiber optic switch built into the ACU and are uploaded to the management platform of the cable integrated monitoring equipment through the fiber optic ring network. The ACU built into the fiber optic switch is a regional control unit for centralized management and transmission.

[0013] A monitoring method for a cable tunnel, comprising a device layer for collecting and transmitting brightness data related to a monitoring screen, an access layer for accessing, storing, calculating, displaying, analyzing, diagnosing and automatically adjusting the brightness data related to the monitoring screen, and a main station layer for receiving all data uploaded by the device layer and the access layer, characterized in that the device layer collects and transmits the brightness of the monitoring screen and the ambient light intensity of the cable tunnel within the current monitoring period: Collection and transmission result 1: when the monitoring screen is not overexposed or underexposed, the monitoring screen is transmitted to the access layer for access, storage and display; Collection and transmission result two: When the monitoring screen is overexposed or underexposed, it is transmitted to the access layer for access, storage, calculation, display, analysis, diagnosis and automatic adjustment.

[0014] Technical effects and advantages of the present invention: In the present invention, by introducing the current ambient light intensity HG and the expected brightness value Lq as adjustment parameters, and combining the brightness adjustment amount LT, the monitoring device can dynamically adjust the brightness of the monitoring screen, which ensures that the monitoring screen of the monitoring cable tunnel can maintain clarity and effectiveness under different lighting conditions.

[0015] In the present invention, the absolute difference adjustment in the initial monitoring brightness unit and the weighted adjustment of the number of errors in the comprehensive adjustment and feedback unit are used to improve the accuracy of brightness adjustment of the monitoring device, which helps to capture detailed information in the monitoring screen in the cable tunnel, thereby further improving the monitoring effect.

[0016] In the present invention, by combining the brightness adjustment times TZ and the maximum brightness adjustment times TZ in the initial adjustment and history adjustment units, max The weighted processing of historical adjustment trends enables the monitoring device to fully utilize past adjustment history, which helps to smooth the brightness changes of the monitoring screen and avoid sudden jumps and unstable monitoring screens.

[0017] In the present invention, when the error number W continues to increase and exceeds the preset error number W0, the monitoring device of the present invention can automatically adjust the brightness adjustment amount LT according to the two situations of overexposure and underexposure of the monitoring picture to correct and adjust the error, which ensures the stability and accuracy of the monitoring picture brightness adjustment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A method flow chart of the monitoring device and monitoring method of the cable tunnel; Figure 2 This is a schematic diagram of the overall structure of the monitoring equipment; Figure 3 It is a structural schematic diagram of the brightness adjustment module in the present invention; Figure 4 It is a schematic diagram of the monitoring screen result compared and displayed by the current brightness value L0 in the present invention. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and preferred embodiments.

[0020] Reference Figure 1-4 As shown, the present invention provides a technical solution: a monitoring device for a cable tunnel, comprising a main station layer, an access layer and a device layer, characterized in that: the main station layer comprises a monitoring module, the access layer comprises a brightness adjustment module, an error processing module and a display control module, and the device layer comprises a data acquisition module, and the specific monitoring steps are as follows: Step 1: Using the data acquisition module, the brightness of the monitoring screen of the cable tunnel and the ambient light intensity in the current monitoring period transmitted and presented by the monitoring equipment are collected, and in the two cases where the monitoring screen is overexposed or underexposed, an adjustment warning signal is transmitted to the brightness adjustment module; Step 2: Use the brightness adjustment module to calculate and output the initial brightness value La, the secondary adjusted brightness value Lb, and the final adjusted brightness value Lc in sequence, and transmit the adjusted brightness value Lc to the display control module to adjust the brightness of the monitoring screen presented by the monitoring device; Step 3: The brightness adjustment module provides the stored error times W and the preset error times W0, and uses the error processing module to automatically adjust the brightness adjustment amount LT; Step 4: the monitoring module monitors and receives the collection and adjustment information of the data collection module, the brightness adjustment module, the error processing module and the display control module; The brightness adjustment module includes an initial adjustment monitoring brightness unit, a combined initial adjustment and history adjustment unit, and a comprehensive adjustment and feedback unit; The access layer is centered on the central control monitoring equipment of the power company's cable status monitoring main station, and is composed of a management platform for cable integrated monitoring equipment, including various servers, clients, and central monitoring equipment software and hardware equipment. The software and hardware equipment is responsible for the access, storage, calculation, display, analysis, diagnosis, and automatic adjustment of the data of each application monitoring equipment of the monitoring equipment, and is responsible for uploading all data of the device layer and the access layer to the main station layer, and the main station layer includes a main station for monitoring power transmission and transformation equipment; The equipment used in the device layer includes sensors, collectors, monitoring cameras, and fiber optic switches. The sensors are connected to the collectors, and the monitoring cameras are connected to the fiber optic switches. All data are uploaded to the management platform of the cable integrated monitoring equipment through the fiber optic switch built into the ACU and the fiber optic ring network. The ACU built into the fiber optic switch is a regional control unit for centralized control and transmission. The signals for adjusting the warning include when the monitoring picture is overexposed, L0>Lq, and when the monitoring picture is underexposed, L0<Lq; Among them, L0 is the current brightness value and Lq is the expected brightness value.

[0021] Based on a cable tunnel monitoring device, the present invention also provides a similar cable tunnel monitoring method, including a device layer for collecting and transmitting brightness data related to the monitoring screen, and an access layer for accessing, storing, calculating, displaying, analyzing, diagnosing and automatically adjusting the brightness data related to the monitoring screen, characterized in that the device layer collects and transmits the brightness of the monitoring screen of the cable tunnel and the ambient light intensity within the current monitoring period: Collection and transmission result 1: when the monitoring screen is not overexposed or underexposed, the monitoring screen is transmitted to the access layer for access, storage and display; Collection and transmission result two: When the monitoring screen is overexposed or underexposed, it is transmitted to the access layer for access, storage, calculation, display, analysis, diagnosis and automatic adjustment.

[0022] This embodiment, based on the cable tunnel monitoring device and the monitoring method in the field of monitoring video communication, realizes the dynamic adjustment and optimization of the brightness of the cable tunnel monitoring screen through a series of carefully designed algorithm formulas and module units, ensuring the effectiveness and clarity of the monitoring of the monitoring device, and the cable tunnel monitoring device and the monitoring method of the present invention improve the accuracy and stability of the brightness adjustment of the monitoring screen by introducing three interrelated algorithm formulas, providing a more reliable and effective solution for the monitoring of the cable tunnel; It is worth noting that the surveillance camera continuously captures the monitoring images of the cable tunnel, and monitors the current ambient light intensity HG in real time through the built-in light sensor, and compares the captured current brightness value L0 with the preset expected brightness value Lq: If the current brightness value L0 is significantly higher than the expected brightness value Lq, that is, the monitoring image is too bright, the monitoring device will identify the need to reduce the brightness; Similarly, if the current brightness value L0 is significantly lower than the expected brightness value Lq, that is, the monitoring image is too dark, the monitoring device will identify the need to increase the brightness.

[0023] Reference Figure 1-4 As shown, in this implementation scheme: the calculation formula for initially adjusting the monitoring brightness unit is as follows: ; in: La is the initial brightness value; L0 is the current brightness value; LT is the brightness adjustment amount. LT reflects the automatic adjustment of the brightness increase or decrease of the monitoring screen in the current monitoring cycle. The details are as follows: When the monitoring image is overexposed, that is, the monitoring image is too bright, LT is a negative value to reduce the brightness; When the monitoring screen is underexposed, that is, the monitoring screen is too dark, LT is a positive value to increase the brightness; HG is the current ambient light intensity; HG max is the maximum value of ambient light intensity; Lq is the expected brightness value, which reflects the brightness level at which the monitoring images in the cable tunnel are clearly transmitted during the current monitoring cycle; Reflects the absolute difference between the current brightness and the expected brightness, and is used to adjust the brightness to approach the expected value.

[0024] In the algorithm implemented in this paper, The calculation unit calculates the absolute difference between the current brightness and the expected brightness, and is used to reflect the gap between the current brightness and the expected brightness. The algorithm adopts absolute value operation to ensure that no matter whether the current brightness value L0 is greater than or less than the expected brightness value Lq, a positive value can be obtained, indicating the amount of brightness that needs to be adjusted. The value calculated by the calculation part is used as part of the adjustment amount to adjust the brightness to a value close to the expected value, thereby improving the clarity of cable tunnel transmission and the presentation of monitoring images; The calculation part is normalized according to the current ambient light intensity to obtain an adjustment factor, which is obtained by dividing the current ambient light intensity HG by the maximum ambient light intensity HG max , get a ratio value between 0 and 1, then add 1 to get the adjustment factor, which can ensure that a reasonable adjustment amount can be obtained under different lighting conditions, and the adjustment factor is used to amplify and reduce the brightness value to achieve further adjustment to adapt to different ambient lighting conditions; This algorithm unit realizes the dynamic adjustment of the brightness of the cable tunnel monitoring screen by introducing the current ambient light intensity HG and the expected brightness value Lq. This means that no matter how the ambient light changes, the monitoring screen can maintain an appropriate brightness level, thereby ensuring the clarity of the transmitted and presented monitoring screen. Especially in the environment with complex lighting conditions in the cable tunnel, the dynamic adaptability of the initial monitoring brightness unit is particularly important. It can adjust the brightness according to the real-time lighting conditions to avoid the monitoring screen being too bright or too dark, and ensure that the monitoring information of the monitoring equipment is clearly visible. The introduction of the brightness adjustment amount LT makes the adjustment process more refined. This fine-tuning capability helps the monitoring equipment to reach the expected brightness value Lq more accurately, thereby improving the effectiveness of the monitoring image. Fine adjustment means that the detailed information in the monitoring image in the cable tunnel can be better preserved and presented, which is crucial for the subsequent monitoring analysis and anomaly detection tasks in the cable tunnel.

[0025] Reference Figure 1-4As shown, in this implementation scheme: the calculation formula combining the initial adjustment and the historical adjustment unit is as follows: ; in: Lb is the brightness value after secondary adjustment; TZ is the number of brightness adjustments, which reflects the cumulative number of brightness adjustments made to the current cable tunnel in the current monitoring cycle due to overexposure and underexposure of the monitoring screen. TZ max The maximum number of brightness adjustments, TZ max Reflects the maximum number of brightness adjustments set by the monitoring equipment in the current monitoring cycle due to overexposure and underexposure of the monitoring screen of the current cable tunnel; L prev It is the brightness value after the last adjustment; is the normalized value of the historical adjustment times and is used to perform weighted adjustment on the initial brightness value La; It is the adjustment amount based on the historical adjustment trend and the current brightness, which is used to smooth the changes in excessive brightness and avoid sudden jumps in the monitoring image during transmission.

[0026] In the algorithm implemented in this paper, The calculation part is calculated by dividing the number of brightness adjustment times TZ by the maximum number of brightness adjustment times TZ max , a ratio value between 0 and 1 is obtained, and the normalized ratio value is used as a weighting factor to adjust the initial brightness value La to smooth the brightness change and avoid sudden jumps; In the calculation part, first calculate the current brightness value La and the brightness value L after the last adjustment prev The difference between , and obtain an adjustment amount. This calculation can ensure that when adjusting the brightness of the monitoring screen, the past adjustment trend is fully taken into account to make the adjustment smoother. The adjustment amount is used to smoothly transmit and present the brightness changes of the monitoring screen to avoid sudden jumps in brightness, thereby improving the stability of the monitoring screen in the cable tunnel; The algorithm combines the initial adjustment with the historical adjustment unit, and realizes the smooth transition of the transmission and presentation of the monitoring screen by introducing the weighted processing of the brightness adjustment times TZ and the historical adjustment trend. This helps to reduce the flickering phenomenon of the monitoring screen, so that the monitoring screen of the monitoring cable tunnel is more continuous and stable. The smooth transition is particularly important for the long-term monitoring task of the cable tunnel, which can reduce the visual fatigue of the monitoring and improve the monitoring efficiency. As the number of brightness adjustment times TZ increases, the maximum number of brightness adjustment times TZmax With continuous accumulation, the monitoring equipment gradually learns the brightness adjustment mode suitable for the current environment. This learning ability enables the monitoring equipment to adjust the brightness more accurately, thereby further improving the clarity and effectiveness of the monitoring image.

[0027] Reference Figure 1-4 As shown, in this implementation scheme: the calculation formula of the comprehensive adjustment and feedback unit is as follows: ; in: Lc is the final adjusted brightness value; W is the number of errors, which reflects the cumulative number of times the current cable tunnel makes two consecutive brightness adjustments due to overexposure and underexposure of the monitoring screen in the current monitoring cycle. Two consecutive times indicates that there is still an error in the brightness of the last adjustment, thus triggering the second adjustment; W0 is the preset error number, which reflects the maximum degree set by the monitoring device for two consecutive brightness adjustments in the current monitoring cycle due to overexposure and underexposure of the monitoring screen in the current cable tunnel; is the adjustment amount based on the difference between the currently adjusted brightness and the expected brightness, and the error factor is introduced, where the error times W are used to reflect the error trend during the adjustment process; is the adjustment amount based on the square of the difference between the last adjustment and the current adjustment, and is used to reduce over-adjustment; The final adjusted brightness value Lc calculated and output by the comprehensive adjustment and feedback unit will be used as the current brightness presentation adjustment of the monitoring device and transmitted to the display control module to complete the adjustment.

[0028] In the algorithm implemented in this paper, The calculation part first calculates the difference between the current further adjusted brightness value Lb and the expected brightness value Lq, and then multiplies it by , get a basic adjustment amount, at the same time, The absolute value of the difference is added to the preset error number W0, and then divided by the square root of the error number W to obtain a weighting factor, which is then multiplied by the difference itself to obtain an additional adjustment amount. The adjustment amount is used to further adjust the brightness to a value close to the expected value, while considering the error number for weighting to reduce the impact of the error on the final brightness; The calculation part first calculates the brightness value Lb after the second adjustment and the brightness value L after the last adjustment. prevThe difference between the two values ​​is then squared and divided by W+1 to obtain another adjustment value. This calculation ensures that when adjusting the brightness, the difference between the last adjustment and the current adjustment is taken into account to avoid brightness instability caused by over-adjustment. The adjustment value is used to reduce over-adjustment, increase the stability of the monitoring image, and make the brightness adjustment smoother and more reasonable. The final adjusted brightness value Lc of the comprehensive adjustment and feedback unit of this algorithm will be used as the current brightness value L0 of the initial adjustment monitoring brightness unit in the next cycle, forming a closed-loop adjustment monitoring device. This feedback mechanism enables the monitoring device to continuously learn and optimize the adjustment strategy according to the actual situation, further improving the effectiveness of the monitoring picture. The closed-loop adjustment also means that the monitoring device can self-repair and adjust, and can quickly restore the stable state of the monitoring cable tunnel when encountering abnormal conditions, thereby ensuring the continuous progress of the monitoring task; In addition, the comprehensive adjustment and feedback unit comprehensively considers multiple factors such as the difference between the current brightness and the expected brightness, historical adjustment information, and the number of errors, and realizes comprehensive adjustment of the brightness, which enables the monitoring equipment to maintain the clarity and effectiveness of the monitoring image in complex and changing environments.

[0029] Reference Figure 1-4 As shown, in this embodiment: based on the difference between the error number W and the preset error number W0, the automatic adjustment of the brightness adjustment amount LT is as follows: If W≤W0 in the current monitoring period, there is no need to automatically adjust the brightness adjustment amount LT; If W>W0 in the current monitoring cycle, the brightness adjustment amount LT is automatically adjusted. The specific adjustment calculation formula is as follows: When the monitoring screen is overexposed: ; When the monitoring screen is underexposed: ; in: LT new is the brightness adjustment amount after adjustment; L min is the minimum brightness value, L min Reflects the minimum brightness level at which the monitoring images in the cable tunnel can be clearly transmitted during the current monitoring cycle; L max is the maximum brightness value, L max Reflects the highest brightness level at which the monitoring images in the cable tunnel are clearly transmitted during the current monitoring cycle; The expected brightness value Lq is located at the minimum brightness value L min and the maximum brightness value L max The middle value between .

[0030] In this implementation, through the feedback loop mechanism, the comprehensive adjustment and feedback unit can continuously optimize the adjustment strategy of the initial adjustment monitoring brightness unit, so that the monitoring device can gradually find the brightness adjustment mode that best suits the current environment during the continuous learning and adaptation process, thereby improving the adjustment efficiency and accuracy. The optimized strategy means that the monitoring device can converge to the expected brightness level faster, reducing unnecessary adjustment times and time waste; After the introduction of error handling and feedback loop mechanisms, the stability of the entire monitoring equipment has been significantly enhanced, which enables the monitoring equipment to quickly adjust and restore the stable state of monitoring the cable tunnel when encountering emergencies, including sudden changes in light intensity and equipment failures, to ensure that the clarity and effectiveness of the monitoring images are not affected; To sum up, the initial adjustment monitoring brightness unit, combined with the initial adjustment and historical adjustment unit, the comprehensive adjustment and feedback unit, and the beneficial effects of the comprehensive adjustment and feedback unit on the cycle of the initial adjustment monitoring brightness unit play an important role in ensuring the clarity of the monitoring picture and the effectiveness of the transmission picture. These formulas together constitute an efficient, stable and intelligent brightness adjustment monitoring device, and provide strong support for monitoring tasks in the complex environment of monitoring cable tunnels.

[0031] It should be noted that any modification, equivalent substitution, improvement, etc. made within the spirit and principles of the present invention should also be within the protection scope of the present invention.

Claims

1. A monitoring device for a cable tunnel, comprising a master station layer, an access layer and a device layer, characterized in that: The master station layer includes a monitoring module, the access layer includes a brightness adjustment module, an error processing module and a display control module, and the device layer includes a data acquisition module. The specific monitoring steps are as follows: Step 1: using the data acquisition module to collect the brightness of the monitoring screen of the cable tunnel and the ambient light intensity in the current monitoring period transmitted and presented by the monitoring device, and transmitting an adjustment warning signal to the brightness adjustment module in the two cases where the monitoring screen is overexposed or underexposed; Step 2: Use the brightness adjustment module to calculate and output the initial brightness value La, the secondary adjusted brightness value Lb, and the final adjusted brightness value Lc in sequence, and transmit the adjusted brightness value Lc to the display control module to adjust the brightness of the monitoring screen presented by the monitoring device; Step 3: The brightness adjustment module provides the stored error times W and the preset error times W0, and uses the error processing module to automatically adjust the brightness adjustment amount LT; Step 4: the monitoring module monitors and receives the collection and adjustment information of the data collection module, the brightness adjustment module, the error processing module and the display control module; The brightness adjustment module includes an initial adjustment and monitoring brightness unit, a combined initial adjustment and history adjustment unit, and a comprehensive adjustment and feedback unit.

2. A cable tunnel monitoring device according to claim 1, characterized in that: The signal for adjusting the warning includes when the monitoring picture is overexposed, L0>Lq, and when the monitoring picture is underexposed, L0<Lq; Among them, L0 is the current brightness value and Lq is the expected brightness value.

3. A cable tunnel monitoring device according to claim 2, characterized in that: The calculation formula for the initial adjustment monitoring brightness unit is as follows: ； in: La is the initial brightness value; L0 is the current brightness value; LT is the brightness adjustment amount. LT reflects the automatic adjustment of the brightness increase or decrease of the monitoring screen in the current monitoring cycle. The details are as follows: When the monitoring image is overexposed, that is, the monitoring image is too bright, LT is a negative value to reduce the brightness; When the monitoring screen is underexposed, that is, the monitoring screen is too dark, LT is a positive value to increase the brightness; HG is the current ambient light intensity; HG max is the maximum value of ambient light intensity; Lq is the expected brightness value, which reflects the brightness level at which the monitoring images in the cable tunnel are clearly transmitted during the current monitoring cycle; Reflects the absolute difference between the current brightness and the expected brightness, and is used to adjust the brightness to approach the expected value.

4. A cable tunnel monitoring device according to claim 3, characterized in that: The calculation formula combining the initial adjustment and historical adjustment units is as follows: ； in: Lb is the brightness value after secondary adjustment; TZ is the number of brightness adjustments, which reflects the cumulative number of brightness adjustments made to the current cable tunnel in the current monitoring cycle due to overexposure and underexposure of the monitoring screen. TZ max The maximum number of brightness adjustments, TZ max Reflects the maximum number of brightness adjustments set by the monitoring equipment in the current monitoring cycle due to overexposure and underexposure of the monitoring screen of the current cable tunnel; L prev It is the brightness value after the last adjustment; is the normalized value of the historical adjustment times and is used to perform weighted adjustment on the initial brightness value La; It is the adjustment amount based on the historical adjustment trend and the current brightness, which is used to smooth the changes in excessive brightness and avoid sudden jumps in the monitoring image during transmission.

5. A cable tunnel monitoring device according to claim 4, characterized in that: The calculation formula of the comprehensive adjustment and feedback unit is as follows: ； in: Lc is the final adjusted brightness value; W is the number of errors, which reflects the cumulative number of times the current cable tunnel makes two consecutive brightness adjustments due to overexposure and underexposure of the monitoring screen in the current monitoring cycle. Two consecutive times indicates that there is still an error in the brightness of the last adjustment, thus triggering the second adjustment; W0 is the preset error number, which reflects the maximum degree set by the monitoring device for two consecutive brightness adjustments in the current monitoring cycle due to overexposure and underexposure of the monitoring screen in the current cable tunnel; is the adjustment amount based on the difference between the currently adjusted brightness and the expected brightness, and the error factor is introduced, where the error times W are used to reflect the error trend during the adjustment process; It is an adjustment based on the square of the difference between the previous adjustment and the current adjustment and is used to reduce over-adjustment.

6. A cable tunnel monitoring device according to claim 5, characterized in that: The final adjusted brightness value Lc calculated and output by the comprehensive adjustment and feedback unit will be used as the current brightness presentation adjustment of the monitoring device and transmitted to the display control module to complete the adjustment.

7. A cable tunnel monitoring device according to claim 6, characterized in that: Based on the difference between the error number W and the preset error number W0, the automatic adjustment of the brightness adjustment amount LT is as follows: If W≤W0 in the current monitoring period, there is no need to automatically adjust the brightness adjustment amount LT; If W>W0 in the current monitoring cycle, the brightness adjustment amount LT is automatically adjusted. The specific adjustment calculation formula is as follows: When the monitoring screen is overexposed: ; When the monitoring screen is underexposed: ; in: LT new is the brightness adjustment amount after adjustment; L min is the minimum brightness value, L min Reflects the minimum brightness level at which the monitoring images in the cable tunnel can be clearly transmitted during the current monitoring cycle; L max is the maximum brightness value, L max Reflects the highest brightness level at which the monitoring images in the cable tunnel are clearly transmitted during the current monitoring cycle; The expected brightness value Lq is located at the minimum brightness value L min and the maximum brightness value L max The middle value between .

8. The monitoring device for a cable tunnel according to claim 7, characterized in that: The access layer is centered on the central control monitoring equipment of the power company's cable status monitoring main station, and is composed of a management platform for cable comprehensive monitoring equipment, including various servers, clients, and central monitoring equipment software and hardware equipment. The software and hardware equipment is responsible for the access, storage, calculation, display, analysis, diagnosis and automatic adjustment of the monitoring equipment data of each application monitoring equipment, and is responsible for uploading all data of the device layer and the access layer to the main station layer, and the main station layer includes a power transmission and transformation equipment monitoring main station; The equipment used at the device layer includes sensors, collectors, monitoring cameras, and fiber optic switches. The sensors are connected to the collectors, and the monitoring cameras are connected to the fiber optic switches. All data pass through the fiber optic switch built into the ACU and are uploaded to the management platform of the cable integrated monitoring equipment through the fiber optic ring network. The ACU built into the fiber optic switch is a regional control unit for centralized management and transmission.

9. A cable tunnel monitoring method for executing a cable tunnel monitoring device according to any one of claims 1 to 8, comprising a device layer for collecting and transmitting brightness data related to monitoring images, an access layer for accessing, storing, calculating, displaying, analyzing, diagnosing and automatically adjusting brightness data related to monitoring images, and a main station layer for receiving all data uploaded by the device layer and the access layer, characterized in that: The device layer collects and transmits the monitoring screen brightness and ambient light intensity of the cable tunnel during the current monitoring period: Collection and transmission result 1: when the monitoring screen is not overexposed or underexposed, the monitoring screen is transmitted to the access layer for access, storage and display; Collection and transmission result 2: When the monitoring screen is overexposed or underexposed, the The access layer performs access, storage, calculation, presentation, analysis, diagnosis and automatic adjustment.

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