Power transmission line icing early warning method and system based on image technology

Abstract

The invention relates to the technical field of power transmission lines, and particularly discloses a power transmission line icing early warning method and system based on an image technology, and the method comprises the steps: obtaining a front view, a 45-degree upward view and a 45-degree top view of a power transmission line; performing perspective transformation of a foresight angle on the 45-degree upward view and the 45-degree top view, and splicing the 45-degree upward view and the 45-degree top view with the foresight view to obtain a corrected foresight view; threshold image segmentation and image feature extraction are carried out on the corrected front view, the icing thickness and icing shape of the power transmission line and the angle between the power transmission line and the horizontal plane are determined, and a thickness early warning score, a shape early warning score and an angle early warning score are obtained; and obtaining an icing score, and judging whether to give an early warning prompt or not according to the icing score. According to the method, the icing thickness, the icing shape and the angle between the power transmission line and the horizontal plane are obtained by using the pictures at different angles, the early warning score is obtained, whether icing is serious or not is judged according to the early warning score, early warning can be given out in time, the detection accuracy is high, and online monitoring is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission lines, and in particular to a method and system for early warning of icing of power transmission lines based on image technology. Background Art

[0002] As an important infrastructure for transmitting and ensuring the supply of electric energy, transmission lines deliver electricity to thousands of households. Their safe and stable operation plays a vital role in the power grid and is also a prerequisite for ensuring normal electricity consumption in households and normal production in enterprises. With the rapid development of the power industry, the safety of transmission lines has received widespread attention.

[0003] Transmission lines are generally erected in the wild and are affected by various conditions. Icing of transmission lines caused by extremely cold weather is one of these adverse conditions, especially in the mountains of the Northeast. The temperature in the Northeast itself is relatively low, and the temperature in the mountains is even lower than in cities and plains. Transmission lines in the mountains of the Northeast are more prone to icing, so it is necessary to frequently observe the icing condition of the cables.

[0004] The existing method is to use manual inspection to observe the icing condition of the transmission lines. Although the icing condition of the transmission lines can be known, the operation intensity is high, and it is inconvenient to travel back and forth to the mountains, and an inspection takes a long time. Summary of the Invention

[0005] The object of the present invention is to provide a method and system for early warning of icing of power transmission lines based on image technology, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A transmission line icing early warning method based on image technology, the method comprising: Obtain the cable temperature and cable pressure of the transmission line. When the ambient temperature is lower than the preset reference value or the cable pressure exceeds the preset reference value, obtain the front view, 45-degree bottom view, and 45-degree top view of the transmission line; Performing a perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view, and the transformed top view to obtain a corrected front view; Perform threshold image segmentation and image feature extraction on the corrected front view to determine the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and obtain thickness warning scores, shape warning scores, and angle warning scores. The thickness warning score, shape warning score and angle warning score are multiplied by their respective weight parameters to obtain the ice coverage score, and whether to issue a warning prompt is determined based on the ice coverage score.

[0007] As a further solution of the present invention, the steps of performing perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view, and the transformed top view to obtain a corrected front view include: Performing a perspective transformation of the 45-degree bottom view to a front view angle using the first transformation matrix to obtain a transformed top view; Perform a perspective transformation of the 45-degree top view to a front view angle using the second transformation matrix to obtain a transformed bottom view; The front view, the transformed bottom view and the transformed top view are superimposed together to obtain a corrected front view.

[0008] As a further solution of the present invention, the steps of performing threshold image segmentation and image feature extraction on the corrected front view, determining the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and obtaining the thickness warning score, shape warning score, and angle warning score include: Performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images; Performing feature extraction on the first corrected image to obtain a plurality of image features, and obtaining the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane based on the image features; The ice thickness, ice shape and angle between the transmission line and the horizontal plane are compared with the preset level range to obtain the thickness warning score, shape warning score and angle warning score.

[0009] As a further solution of the present invention, the step of extracting features from the first corrected image to obtain a plurality of image features, and determining the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane based on the image features includes: Taking the center of the first correction diagram as the origin, establish the coordinate axis and obtain the coordinates of the outermost layer of the cable and the outermost layer of the ice layer; The ice thickness of the transmission line is obtained based on the difference between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis; Draw the outer contour of the ice layer based on the outermost coordinates of the ice layer to obtain the shape and coordinates of the ice cover; Based on the shape and coordinates of the ice cover, the angle between the transmission line and the horizontal plane is obtained.

[0010] As a further solution of the present invention, the step of performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images includes: Segment the corrected front view into different sub-images; The sub-images are segmented using different thresholds to obtain a plurality of segmented first corrected images.

[0011] The technical solution of the present invention also provides a transmission line icing warning system based on image technology, the system comprising: An acquisition module is used to obtain the cable temperature and cable pressure of the transmission line. When the ambient temperature is lower than a preset reference value or the cable pressure exceeds a preset reference value, a front view, a 45-degree bottom view, and a 45-degree top view of the transmission line are obtained; a transformation module for performing perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view, and the transformed top view to obtain a corrected front view; An extraction module is used to perform threshold image segmentation and image feature extraction on the corrected front view to determine the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and to obtain a thickness warning score, a shape warning score, and an angle warning score; The judgment module is used to multiply the thickness warning score, shape warning score and angle warning score by their respective weight parameters to obtain the ice coverage score, and determine whether to issue a warning prompt based on the ice coverage score.

[0012] As a further solution of the present invention: the transformation module includes: A first transformation unit is configured to perform a perspective transformation of the 45-degree bottom view at a front view angle using a first transformation matrix to obtain a transformed top view; A second transformation unit is configured to perform a perspective transformation of the 45-degree top view at a front view angle using a second transformation matrix to obtain a transformed bottom view; The superposition unit is used for superposing the front view, the transformed bottom view and the transformed top view to obtain a corrected front view.

[0013] As a further solution of the present invention: the extraction module includes: a segmentation unit, configured to perform threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images; an extraction unit, configured to perform feature extraction on the first corrected image to obtain a plurality of image features, and derive the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane based on the image features; The comparison unit is used to compare the ice thickness, ice shape and angle between the transmission line and the horizontal plane of the transmission line with a preset level range to obtain a thickness warning score, a shape warning score and an angle warning score.

[0014] As a further solution of the present invention: the comparison unit includes: A coordinate establishing unit, for establishing a coordinate axis with the center of the first correction diagram as the origin, and obtaining the coordinates of the outermost layer of the cable and the outermost layer of the ice layer; A thickness generation unit is used to obtain the ice thickness of the transmission line based on the difference between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis; A shape generation unit is used to draw the outer contour of the ice layer according to the outermost coordinates of the ice layer to obtain the shape and coordinates of the ice cover; The angle generating unit is used to obtain the angle between the transmission line and the horizontal plane according to the shape and coordinates of the ice cover.

[0015] As a further solution of the present invention: the segmentation unit includes: a sub-image generating unit, configured to segment the corrected front view into different sub-images; The correction image generating unit is used to segment the sub-image using different thresholds to obtain a plurality of segmented first correction images.

[0016] Compared with the existing technology, the beneficial effects of the present invention are: the present invention determines whether to perform image detection based on the ambient temperature and pressure of the cable, and then uses photos at different angles to obtain the ice thickness, ice shape and the angle between the transmission line and the horizontal plane to obtain a warning score. Based on the warning score, it is determined whether the ice is serious, and an early warning can be issued in time to ensure the normal operation of the transmission line. The detection accuracy is high and online monitoring is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention.

[0018] Figure 1 This is a flowchart of the transmission line icing warning method based on image technology.

[0019] Figure 2 This is a block diagram of the second sub-process of the transmission line icing warning method based on image technology.

[0020] Figure 3 This is the third sub-process block diagram of the transmission line icing warning method based on image technology.

[0021] Figure 4 This is a structural block diagram of the transmission line icing warning system based on image technology.

[0022] Figure 5 This is a structural block diagram of the conversion module in the transmission line icing warning system based on image technology.

[0023] Figure 6 This is a structural block diagram of the extracted modules in the transmission line icing warning system based on image technology. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] Example 1: Figure 1 This is a flowchart of a method for early warning of ice accretion on power transmission lines based on image technology. In an embodiment of the present invention, a method for early warning of ice accretion on power transmission lines based on image technology includes: Obtain the cable temperature and cable pressure of the transmission line. When the ambient temperature is lower than the preset reference value or the cable pressure exceeds the preset reference value, obtain the front view, 45-degree bottom view, and 45-degree top view of the transmission line; Icing on transmission lines will lower the temperature of cables, because at this time the cables have to withstand the gravity caused by ice, which will also increase the pressure on the cables. Icing within a certain degree will not affect the normal operation of the transmission lines. Only when the icing exceeds the limit will it affect the transmission performance of the transmission lines. The ambient temperature and the pressure on the cables at the limit are detected. The ambient temperature at this time is used as the temperature preset reference value, and the pressure on the cables at this time is used as the pressure preset reference value. If the temperature is lower than the temperature preset reference value or the pressure exceeds the pressure preset reference value, it means that the icing has affected the normal operation of the transmission line and de-icing is required. Icing indicates that the ambient temperature is very low and may be accompanied by strong winds, rain and other factors. Therefore, it is necessary to photograph the icing situation of the cables from different angles and then conduct a comprehensive comparison to obtain the accurate situation of the icing. At this time, use a drone or other high-altitude shooting equipment to take pictures of the cables of the transmission line from multiple angles to obtain a front view, a 45-degree upward view and a 45-degree top view of the transmission line.

[0026] Performing a perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view, and the transformed top view to obtain a corrected front view; In order to better observe the ice coverage of the cable, all images need to be converted to the same angle for easy comparison. Here, all images are converted to the front view angle, and the 45-degree bottom view and the 45-degree top view are transformed with different transformation matrices. The image after the 45-degree bottom view is transformed to the front view angle and the image after the 45-degree top view is transformed to the front view angle can be obtained. By comparing these two with the front view, it can be confirmed whether each place is covered with ice, and an accurate cable ice coverage image at the front view angle can be obtained.

[0027] Threshold image segmentation and image feature extraction are performed on the corrected front view to determine the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and to obtain the thickness warning score, shape warning score and angle warning score.

[0028] Threshold image segmentation is intuitive and easy to implement. It can clearly indicate the grayscale of different image regions, and a single threshold can be used to separate bright and dark objects. The definition of a thresholded image is as follows: a threshold is set. When the pixel grayscale value is greater than or equal to the threshold, the pixel's grayscale is marked as 1, indicating an object of interest. When the pixel grayscale value is less than the threshold, the pixel's grayscale is marked as 0, indicating an object to be ignored. Image feature extraction aims to identify factors and features related to ice warning from the image. Through observation and calculation, the required ice warning factors, namely ice thickness, ice shape, and the angle between the transmission line and the horizontal plane, are determined. This data is then assigned to a specific level, resulting in a thickness warning score, a shape warning score, and an angle warning score, facilitating subsequent calculations.

[0029] The thickness warning score, shape warning score, and angle warning score are multiplied by their respective weight parameters to obtain the ice coverage score, which is used to determine whether to issue a warning prompt.

[0030] The thickness of ice, the shape of ice, and the angle between the transmission line and the horizontal plane have different effects on the normal operation of the transmission line. Based on the impact of these factors on the performance of the transmission line, different influencing factors are assigned to these factors. The influencing factor is the weight parameter. The ice score = thickness warning score * thickness weight parameter + shape warning score * shape weight parameter + angle warning score * angle weight parameter. The ice score is compared with the preset warning score. When the ice score is greater than or equal to the warning score, an early warning prompt is issued, thereby reminding management personnel to send people to remove ice to ensure the normal operation of the transmission line. The higher the ice score, the more serious the ice cover on the transmission line.

[0031] Figure 2 This is a block diagram of the second sub-process of the transmission line icing warning method based on image technology. In an embodiment of the present invention, the steps of performing perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view, and the transformed top view to obtain a corrected front view include: Performing a perspective transformation of the 45-degree bottom view to a front view angle using the first transformation matrix to obtain a transformed top view; The 45-degree bottom view is an image taken from a 45-degree direction and from bottom to top. Four points are selected from the 45-degree bottom view, and the coordinates of these four points are known. These four points are projected onto the front view surface in sequence. The first transformation matrix can be obtained based on the changes in the coordinates of these four points. All points in the 45-degree bottom view are transformed using the first transformation matrix to obtain the transformed bottom view.

[0032] Perform a perspective transformation of the 45-degree top view to a front view angle using the second transformation matrix to obtain a transformed bottom view; The 45-degree top view is an image taken from a 45-degree direction and from top to bottom. Four points are selected from the 45-degree top view, and the coordinates of these four points are known. These four points are projected onto the front view surface in sequence. The second transformation matrix can be obtained based on the changes in the coordinates of these four points. All points in the 45-degree top view are transformed using the second transformation matrix to obtain the transformed top view.

[0033] The front view, the transformed bottom view and the transformed top view are superimposed together to obtain a corrected front view.

[0034] Due to the influence of factors such as light and air, some areas of a photo taken at a certain angle may be unclear. By overlapping the front view, the transformed bottom view, and the transformed top view, we can obtain the front view of the real scene to the maximum extent, thereby better judging the icing condition of the transmission line.

[0035] Figure 3 This is a block diagram of the third sub-process of the transmission line icing warning method based on image technology. The steps of performing threshold image segmentation and image feature extraction on the corrected front view, determining the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and obtaining the thickness warning score, shape warning score, and angle warning score include: Performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images; The corrected front view is divided into a plurality of sub-images, and then each sub-image is subjected to threshold segmentation to obtain a plurality of first corrected images, each of which is a partial area of ​​the corrected front view; Performing feature extraction on the first corrected image to obtain a plurality of image features, and obtaining the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane based on the image features; Each sub-image contains part of the front view area. The performance of the transmission line is affected by the thickness and shape of the ice cover and the angle between the transmission line and the horizontal plane. For example, the thicker the ice cover, the larger the angle between the transmission line and the horizontal plane, the more difficult it is for the transmission line to transport electricity and the greater the power loss, and the worse the transmission line performance. All image features combined can indicate the ice cover thickness, ice shape and the angle between the transmission line and the horizontal plane.

[0036] The ice thickness, ice shape and angle between the transmission line and the horizontal plane are compared with the preset level range to obtain the thickness warning score, shape warning score and angle warning score.

[0037] There is a preset thickness warning score corresponding to the ice thickness range. The first thickness level is 5-10mm, and the corresponding thickness warning score is 0.2. The second thickness level is 10-15mm, and the corresponding thickness warning score is 0.3. The third thickness level is 15-20mm, and the corresponding thickness warning score is 0.4. The greater the ice thickness, the more difficult it is for the transmission line to transmit power, and the greater the degree of impact on the transmission line. Ice coverage can be circular, elliptical, or irregular. Circular ice coverage means that the cable is surrounded by ice to the same degree above and below it, and the transmission losses of the transmission line in all directions are roughly the same. This has the greatest impact on the performance of the transmission line. Elliptical ice coverage means that the cable is surrounded by ice to different degrees above and below it, and the transmission losses of the transmission line in the direction of smaller ice thickness are less than the transmission losses of the transmission line in the direction of larger ice thickness. This has a greater impact on the performance of the transmission line. Irregular ice coverage means that the cable is surrounded by ice to different degrees above and below it at each location along its length, and this has less impact on the performance of the transmission line. The shape warning scores for circular ice coverage are 0.6, elliptical ice coverage is 0.4, and irregular ice coverage is 0.2. The angle between the transmission line and the horizontal plane is 0-90 degrees. 90 degrees means that the transmission line has been bent into a right angle, or even the ice has collapsed the transmission line. At this time, the performance of the transmission line is most affected. The angle warning score of 5-30 degrees can be set to 0.3, the angle warning score of 30-60 degrees can be set to 0.6, the angle warning score of 60-80 degrees can be set to 0.8, and the angle warning score of 80-90 degrees can be set to 1.

[0038] The step of performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images comprises: Segment the corrected front view into different sub-images; The corrected front view is divided into different areas according to the preset rules. Each area is a sub-image. Here, the corrected front view can be divided into four sub-images of the top, bottom, left and right according to the center, or it can be divided into 4-8 parts in order from left to right. The segmentation rules are determined according to the actual situation.

[0039] The sub-images are segmented using different thresholds to obtain a plurality of segmented first corrected images.

[0040] Each sub-image is unique, requiring a different thresholding method to achieve a clear and accurate image. These methods include single global thresholding, dual global thresholding, and basic adaptive thresholding. The single global thresholding method simply scans each image pixel individually and labels pixels as object or background based on whether their grayscale values ​​are greater than or less than a set threshold T. For image segmentation, if the background and object are similar in size, the initial value of T should be the average grayscale value of the entire image. If the object and background have significantly different areas, the initial value of T should be something like the midpoint of the grayscale values. The dual global thresholding method transforms the middle grayscale to 1 and all other grayscales to 0. The middle grayscale represents the point where grayscale changes suddenly. The basic adaptive thresholding method further subdivides the image into two sub-images and then uses different thresholds for segmentation. This method is suitable for images with uneven grayscale levels.

[0041] The step of extracting features from the first corrected image to obtain a plurality of image features, and determining the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane based on the image features comprises: Taking the center of the first correction diagram as the origin, establish the coordinate axis and obtain the coordinates of the outermost layer of the cable and the outermost layer of the ice layer; A coordinate system is established in each first correction diagram, with the center of the first correction diagram as the origin. The distances from the outermost layer of the cable and the outermost layer of the ice layer to the origin of the coordinate axis are measured. In this way, the coordinates of the outermost layer of the cable on each coordinate axis and the coordinates of the outermost layer of the ice layer on each coordinate axis can be obtained.

[0042] The ice thickness of the transmission line is obtained based on the difference between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis; Subtract the coordinates of the outermost layer of the cable on each coordinate axis from the coordinates of the outermost layer of the ice layer on each coordinate axis to obtain the difference on each coordinate axis. Then, take the square root of the sum of the squares of the differences on each coordinate axis. The square root obtained is the ice thickness of the transmission line. For example, if the coordinates of the outermost layer of the ice layer are (a1, b1), and the coordinates of the outermost layer of the cable are (a2, b2), the ice thickness of the transmission line is f, f 2 =(a1-a2) 2 +(b1-b2) 2 .

[0043] Draw the outer contour of the ice layer based on the outermost coordinates of the ice layer to obtain the shape and coordinates of the ice cover; The cable is round, so you only need to look at the outer contour of the ice layer to determine the shape of the ice cover. By marking the outermost points of the ice layer, you can get the coordinates of the ice layer. Then, by connecting the outermost points of the ice layer one by one, you can get the outer contour of the ice layer. Based on the outer contour of the ice layer, you can judge whether the shape of the ice cover is round, elliptical or irregular.

[0044] Based on the shape and coordinates of the ice cover, the angle between the transmission line and the horizontal plane is obtained.

[0045] Knowing the coordinates of the starting and ending points of the ice layer means knowing the values ​​of their coordinates on each coordinate axis. By simulating the ice cover curve and establishing a right triangle, the angle between the transmission line and the horizontal plane can be calculated using conventional mathematical methods.

[0046] Figure 4 This is a structural block diagram of a power transmission line ice warning system based on image technology. The system includes: an acquisition module for acquiring cable temperature and cable pressure of the transmission line. When the ambient temperature is lower than a preset reference value or the cable pressure exceeds a preset reference value, a front view, a 45-degree bottom view, and a 45-degree top view of the transmission line are acquired; a transformation module for performing perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view, and the transformed top view to obtain a corrected front view; An extraction module is used to perform threshold image segmentation and image feature extraction on the corrected front view to determine the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and to obtain a thickness warning score, a shape warning score, and an angle warning score; The judgment module is used to multiply the thickness warning score, shape warning score and angle warning score by their respective weight parameters to obtain the ice coverage score, and determine whether to issue a warning prompt based on the ice coverage score.

[0047] Figure 5 This is a structural block diagram of a conversion module in an image-based transmission line icing warning system. The conversion module includes: A first transformation unit is configured to perform a perspective transformation of the 45-degree bottom view at a front view angle using a first transformation matrix to obtain a transformed top view; A second transformation unit is configured to perform a perspective transformation of the 45-degree top view at a front view angle using a second transformation matrix to obtain a transformed bottom view; The superposition unit is used for superposing the front view, the transformed bottom view and the transformed top view to obtain a corrected front view.

[0048] Figure 6This is a structural block diagram of the extraction module in the transmission line icing warning system based on image technology. The extraction module includes: a segmentation unit, configured to perform threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images; an extraction unit, configured to perform feature extraction on the first corrected image to obtain a plurality of image features, and derive the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane based on the image features; The comparison unit is used to compare the ice thickness, ice shape and angle between the transmission line and the horizontal plane of the transmission line with a preset level range to obtain a thickness warning score, a shape warning score and an angle warning score.

[0049] The comparison unit includes: A coordinate establishing unit, for establishing a coordinate axis with the center of the first correction diagram as the origin, and obtaining the coordinates of the outermost layer of the cable and the outermost layer of the ice layer; A thickness generation unit is used to obtain the ice thickness of the transmission line based on the difference between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis; A shape generation unit is used to draw the outer contour of the ice layer according to the outermost coordinates of the ice layer to obtain the shape and coordinates of the ice cover; The angle generating unit is used to obtain the angle between the transmission line and the horizontal plane according to the shape and coordinates of the ice cover.

[0050] The segmentation unit includes: a sub-image generating unit, configured to segment the corrected front view into different sub-images; The correction image generating unit is used to segment the sub-image using different thresholds to obtain a plurality of segmented first correction images.

[0051] The functions that can be achieved by the transmission line icing warning method based on image technology are all completed by a computer device. The computer device includes one or more processors and one or more memories. The one or more memories store at least one program code. The program code is loaded and executed by the one or more processors to achieve the functions of the user behavior prediction method based on big data.

[0052] The processor retrieves instructions from the memory one by one, analyzes the instructions, and then performs corresponding operations according to the instructions, generating a series of control commands, so that the various parts of the computer can automatically, continuously and coordinately operate as an organic whole, realizing program input, data input, calculation and output of results. The arithmetic operations or logical operations generated in this process are all completed by the operator; the memory includes a read-only memory (ROM), which is used to store computer programs, and a protection device is provided on the outside of the memory.

[0053] For example, a computer program may be divided into one or more modules, one or more of which are stored in a memory and executed by a processor to implement the present invention. One or more modules may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in a terminal device.

[0054] Those skilled in the art will understand that the description of the above-mentioned service device is merely an example and does not constitute a limitation on the terminal device. It may include more or fewer components than described above, or a combination of certain components, or different components, for example, it may include input and output devices, network access devices, buses, etc.

[0055] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor. The processor is the control center of the terminal device, connecting all parts of the user terminal using various interfaces and lines.

[0056] The memory can be used to store computer programs and / or modules. The processor implements the various functions of the terminal device by running or executing the computer programs and / or modules stored in the memory and accessing data stored in the memory. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function (such as an information collection template display function and a product information release function); the data storage area may store data generated based on the use of the berth status display system (such as product information collection templates corresponding to different product types and product information required to be released by different product providers). Furthermore, the memory may include high-speed random access memory (RAM) and non-volatile memory, such as a hard disk, internal memory, a plug-in hard disk, a smart media card (SMC), a secure digital (SD) card, a flash memory card, at least one disk storage device, a flash memory device, or other volatile solid-state storage device.

[0057] If the modules / units integrated into the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the present invention can also implement all or part of the modules / units in the above-mentioned system embodiments by instructing the relevant hardware through a computer program. The above-mentioned computer program can be stored in a computer-readable storage medium. When executed by a processor, the computer program can implement the functions of each of the above-mentioned system embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form. Computer-readable media can include: any entity or device capable of carrying computer program code, recording media, USB flash drives, mobile hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunications signals, and software distribution media.

[0058] It should be noted that, in this document, the term "comprises" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article, or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A power transmission line icing early warning method based on image technology, characterized in that: The method comprises: Obtain the cable temperature and cable pressure of the transmission line. When the ambient temperature is lower than a preset reference value or the cable pressure exceeds a preset reference value, obtain a front view, a 45-degree bottom view, and a 45-degree top view of the transmission line. Performing perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view and the transformed top view to obtain a corrected front view; Perform threshold image segmentation and image feature extraction on the corrected front view to determine the ice thickness and shape of the transmission line and the angle between the transmission line and the horizontal plane, and obtain the thickness warning score, shape warning score and angle warning score; The thickness warning score, shape warning score and angle warning score are multiplied by their respective weight parameters to obtain the ice coverage score, and whether to issue a warning prompt is determined based on the ice coverage score.

2. The power transmission line icing early warning method based on image technology according to claim 1 is characterized in that: The steps of performing perspective transformation of the 45-degree bottom view and the 45-degree top view of the power transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and splicing the front view, the transformed bottom view and the transformed top view to obtain a corrected front view include: The 45-degree bottom view is transformed into a front view using the first transformation matrix to obtain a transformed top view; The 45-degree top view is transformed into a perspective view at a front view angle using the second transformation matrix to obtain a transformed bottom view; The front view, the transformed bottom view and the transformed top view are superimposed together to obtain a corrected front view.

3. The power transmission line icing early warning method based on image technology according to claim 1 is characterized in that: The steps of performing threshold image segmentation and image feature extraction on the corrected front view, determining the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane, and obtaining the thickness warning score, shape warning score and angle warning score include: Performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images; Extracting features from the first correction image to obtain a plurality of image features, and obtaining the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane according to the image features; The ice thickness, ice shape and angle between the transmission line and the horizontal plane are compared with the preset grade range to obtain the thickness warning score, shape warning score and angle warning score.

4. The power transmission line icing early warning method based on image technology according to claim 3 is characterized in that: The step of performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images comprises: Segment the corrected front view into different sub-images; The sub-images are segmented using different thresholds to obtain a plurality of segmented first correction images.

5. The power transmission line icing early warning method based on image technology according to claim 3 or 4, characterized in that: The step of extracting features from the first correction image to obtain a plurality of image features, and obtaining the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane according to the image features comprises: Taking the center of the first correction diagram as the origin, establish the coordinate axis and obtain the coordinates of the outermost layer of the cable and the outermost layer of the ice layer; The ice thickness of the transmission line is obtained based on the difference between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis; Draw the outer contour of the ice layer based on the outermost coordinates of the ice layer to obtain the shape and coordinates of the ice cover; Based on the shape and coordinates of the ice cover, the angle between the transmission line and the horizontal plane is obtained.

6. A power transmission line icing warning system based on image technology, characterized in that: The system comprises: An acquisition module is used to acquire the cable temperature and cable pressure of the transmission line. When the ambient temperature is lower than a preset reference value or the cable pressure exceeds a preset reference value, a front view, a 45-degree bottom view and a 45-degree top view of the transmission line are acquired; A transformation module is used to perform perspective transformation of the 45-degree bottom view and the 45-degree top view of the transmission line at a front view angle to obtain a transformed bottom view and a transformed top view, and to splice the front view, the transformed bottom view and the transformed top view to obtain a corrected front view; An extraction module is used to perform threshold image segmentation and image feature extraction on the corrected front view, determine the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane, and obtain a thickness warning score, a shape warning score and an angle warning score; The judgment module is used to multiply the thickness warning score, shape warning score and angle warning score by their respective weight parameters to obtain an icing score, and determine whether to issue a warning prompt based on the icing score.

7. The power transmission line icing warning system based on image technology according to claim 6 is characterized in that: The transformation module comprises: A first transformation unit is used to perform a perspective transformation of the 45-degree bottom view at a front view angle using a first transformation matrix to obtain a transformed top view; A second transformation unit is used to perform a perspective transformation of the 45-degree top view at a front view angle using a second transformation matrix to obtain a transformed bottom view; The overlap unit is used to overlap the front view, the transformed bottom view and the transformed top view to obtain a corrected front view.

8. The power transmission line icing warning system based on image technology according to claim 6 is characterized in that: The extraction module comprises: A segmentation unit, used for performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images; An extraction unit is used to extract features from the first correction image to obtain a plurality of image features, and to obtain the ice thickness and ice shape of the transmission line and the angle between the transmission line and the horizontal plane according to the image features; The comparison unit is used to compare the ice thickness, ice shape and angle between the transmission line and the horizontal plane of the transmission line with a preset level range to obtain a thickness warning score, a shape warning score and an angle warning score.

9. The power transmission line icing warning system based on image technology according to claim 8 is characterized in that: The segmentation unit comprises: A sub-image generating unit, used for dividing the corrected front view into different sub-images; The correction image generating unit is used to segment the sub-images using different thresholds to obtain a plurality of segmented first correction images.

10. The power transmission line icing warning system based on image technology according to claim 8 or 9, characterized in that: The comparison unit comprises: A coordinate establishing unit, used to establish a coordinate axis with the center of the first correction diagram as the origin, and obtain the outermost coordinates of the cable and the outermost coordinates of the ice layer; A thickness generating unit is used to obtain the ice thickness of the transmission line according to the difference between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis; A shape generation unit is used to draw the outer contour of the ice layer according to the outermost coordinates of the ice layer to obtain the shape and coordinates of the ice cover; The angle generating unit is used to obtain the angle between the transmission line and the horizontal plane according to the shape and coordinates of the ice cover.

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