An icing warning method and system for transmission lines based on image technology

Abstract

The present invention relates to the technical field of transmission lines, and specifically discloses an ice coating warning method and system for transmission lines based on image technology. The method includes obtaining a front view, a 45-degree upward view, and a 45-degree downward view of the transmission line; performing perspective transformation of the 45-degree upward view and the 45-degree downward view to the front view angle and splicing them with the front view to obtain a corrected front view; performing threshold image segmentation and image feature extraction on the corrected front view to determine the ice coating thickness, ice coating shape, and the angle between the transmission line and the horizontal plane of the transmission line, obtaining a thickness warning score, a shape warning score, and an angle warning score; obtaining an ice coating score, and determining whether to issue a warning prompt based on the ice coating score. The present invention uses photos at different angles to obtain the ice coating thickness, ice coating shape, and the angle between the transmission line and the horizontal plane, obtains a warning score, and determines whether the ice coating is serious based on the warning score, can issue a warning in time, has high detection accuracy, and realizes online monitoring.

Description

Technical Field

[0001] The present invention relates to the technical field of transmission lines, and specifically to a method and system for icing warning of 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 electric energy to thousands of households. Their safe and stable operation plays a crucial role in the power grid and is also a prerequisite for ensuring normal household electricity use and normal production of enterprises. With the rapid development of the power industry, the safety of transmission lines has received extensive 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 the adverse conditions. Especially in the mountains of Northeast China, the temperature in Northeast China itself is relatively low. Compared with cities and plains, the temperature in the mountains is even lower. Transmission lines in the mountains of Northeast China are more likely to be iced, so it is necessary to frequently observe the icing condition of the cables.

[0004] The existing methods all use manual inspection to observe the icing condition of transmission lines. Although the icing condition of transmission lines can be known, the work intensity is large, and it is not convenient to travel back and forth in the mountains. The time spent on one inspection is relatively long. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and system for icing warning of transmission lines based on image technology to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A method for icing warning of transmission lines based on image technology, the method comprising:

[0008] 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 the preset reference value, obtain the front view, 45-degree elevation view, and 45-degree top view of the transmission line;

[0009] Perform perspective transformation of the 45-degree elevation view and 45-degree top view of the transmission line to the front view angle to obtain the transformed elevation view and the transformed top view, and splice the front view, the transformed elevation view, and the transformed top view to obtain a corrected front view;

[0010] Perform threshold image segmentation and image feature extraction on the corrected front view to determine the icing thickness, icing shape, and the angle between the transmission line and the horizontal plane of the transmission line, and obtain a thickness warning score, a shape warning score, and an angle warning score;

[0011] The thickness warning score, the shape warning score, and the angle warning score are multiplied by their respective weight parameters to obtain the icing score, and whether to issue a warning prompt is judged based on the icing score.

[0012] As a further solution of the present invention: The step of performing a perspective transformation of the 45-degree upward view and the 45-degree downward view of the transmission line to the front view angle to obtain the transformed upward view and the transformed downward view, and splicing the front view, the transformed upward view, and the transformed downward view to obtain the corrected front view includes:

[0013] Performing a perspective transformation of the 45-degree upward view to the front view angle using the first transformation matrix to obtain the transformed downward view;

[0014] Performing a perspective transformation of the 45-degree downward view to the front view angle using the second transformation matrix to obtain the transformed upward view;

[0015] Overlapping the front view, the transformed upward view, and the transformed downward view together to obtain the corrected front view.

[0016] As a further solution of the present invention: The step of performing threshold image segmentation and image feature extraction on the corrected front view to determine the icing thickness, icing shape of the transmission line, and the angle between the transmission line and the horizontal plane, and obtaining the thickness warning score, the shape warning score, and the angle warning score includes:

[0017] Performing threshold image segmentation on the corrected front view to obtain a plurality of first corrected images after segmentation;

[0018] Performing feature extraction on the first corrected image to obtain a plurality of image features, and obtaining the icing thickness, icing shape of the transmission line, and the angle between the transmission line and the horizontal plane based on the image features;

[0019] Comparing the icing thickness, icing shape of the transmission line, and the angle between the transmission line and the horizontal plane with the preset grade range to obtain the thickness warning score, the shape warning score, and the angle warning score.

[0020] As a further solution of the present invention: The step of performing feature extraction on the first corrected image to obtain a plurality of image features, and obtaining the icing thickness, icing shape of the transmission line, and the angle between the transmission line and the horizontal plane based on the image features includes:

[0021] Taking the center of the first corrected image as the origin, establishing coordinate axes, and obtaining the outermost coordinates of the cable and the outermost coordinates of the ice layer;

[0022] Based on the differences of the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis, obtaining the icing thickness of the transmission line;

[0023] 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-covered area;

[0024] Based on the shape and coordinates of the ice-covered area, obtain the angle between the transmission line and the horizontal plane.

[0025] As a further solution of the present invention: the step of performing threshold image segmentation on the corrected front view to obtain multiple segmented first corrected views includes:

[0026] Divide the corrected front view into different sub-images;

[0027] Perform segmentation on the sub-images using different thresholds to obtain multiple segmented first corrected views.

[0028] The technical solution of the present invention also provides an ice accretion warning system for transmission lines based on image technology, and the system includes:

[0029] An acquisition module, configured 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 the preset reference value, acquire the front view, 45-degree elevation view, and 45-degree top view of the transmission line;

[0030] A transformation module, configured to perform perspective transformation of the 45-degree elevation view and 45-degree top view of the transmission line to the front view angle to obtain the transformed elevation view and the transformed top view, and splice the front view, the transformed elevation view, and the transformed top view to obtain the corrected front view;

[0031] An extraction module, configured to perform threshold image segmentation and image feature extraction on the corrected front view to determine the ice accretion thickness, ice accretion shape, and the angle between the transmission line and the horizontal plane of the transmission line, and obtain a thickness warning score, a shape warning score, and an angle warning score;

[0032] A judgment module, configured to multiply the thickness warning score, the shape warning score, and the angle warning score by their respective weight parameters to obtain an ice accretion score, and judge whether to issue a warning prompt based on the ice accretion score.

[0033] As a further solution of the present invention: the transformation module includes:

[0034] A first transformation unit, configured to perform perspective transformation of the 45-degree elevation view to the front view angle using a first transformation matrix to obtain the transformed top view;

[0035] A second transformation unit, configured to perform perspective transformation of the 45-degree top view to the front view angle using a second transformation matrix to obtain the transformed elevation view;

[0036] A coincidence unit, configured to coincide the front view, the transformed elevation view, and the transformed top view together to obtain the corrected front view.

[0037] As a further solution of the present invention: The extraction module includes:

[0038] A segmentation unit for performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images;

[0039] An extraction unit for extracting features from the first corrected image to obtain a plurality of image features, and obtaining the ice coating thickness, ice coating shape of the transmission line, and the angle between the transmission line and the horizontal plane based on the image features;

[0040] A comparison unit for comparing the ice coating thickness, ice coating shape of the transmission line, and the angle between the transmission line and the horizontal plane with a preset grade range to obtain a thickness warning score, a shape warning score, and an angle warning score.

[0041] As a further solution of the present invention: The comparison unit includes:

[0042] A coordinate establishment unit for taking the center of the first corrected image as the origin, establishing coordinate axes, and obtaining the outermost coordinates of the cable and the outermost coordinates of the ice layer;

[0043] A thickness generation unit for obtaining the ice coating thickness of the transmission line based on the differences between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis;

[0044] A shape generation unit for drawing 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 coating;

[0045] An angle generation unit for obtaining the angle between the transmission line and the horizontal plane based on the shape and coordinates of the ice coating.

[0046] As a further solution of the present invention: The segmentation unit includes:

[0047] A sub-image generation unit for segmenting the corrected front view into different sub-images;

[0048] A corrected image generation unit for segmenting the sub-images with different thresholds to obtain a plurality of segmented first corrected images.

[0049] Compared with the prior art, the beneficial effects of the present invention are: The present invention determines whether to perform image detection based on the ambient temperature and the pressure borne by the cable, and then uses photos at different angles to obtain the ice coating thickness, ice coating shape, and the angle between the transmission line and the horizontal plane, obtains a warning score, and judges whether the ice coating is serious based on the warning score, can issue a warning in time, ensure the normal operation of the transmission line, has high detection accuracy, and realizes online monitoring. Description of the Drawings

[0050] To more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention.

[0051] Figure 1 It is a flowchart of a transmission line icing warning method based on image technology.

[0052] Figure 2 It is a second sub - flowchart of a transmission line icing warning method based on image technology.

[0053] Figure 3 It is a third sub - flowchart of a transmission line icing warning method based on image technology.

[0054] Figure 4 It is a block diagram of the composition structure of a transmission line icing warning system based on image technology.

[0055] Figure 5 It is a block diagram of the composition structure of the transformation module in a transmission line icing warning system based on image technology.

[0056] Figure 6 It is a block diagram of the composition structure of the extraction module in a transmission line icing warning system based on image technology. Specific embodiments

[0057] 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 will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0058] Embodiment 1: Figure 1 It is a flowchart of a transmission line icing warning method based on image technology. In an embodiment of the present invention, a transmission line icing warning method based on image technology, the method includes:

[0059] 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 elevation view and 45 - degree top - down view of the transmission line;

[0060] Icing on transmission lines can reduce the temperature of the cables. At this time, the cables also have to bear the gravity caused by icing, which will also increase the pressure on the cables. Icing within a certain range will not affect the normal operation of the transmission lines. Only when the icing exceeds the limit will it affect the power transmission performance of the transmission lines. Detect the ambient temperature and the pressure on the cables at this limit. 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. When the temperature is lower than the temperature preset reference value or the pressure exceeds the pressure preset reference value, it indicates that the icing has affected the normal operation of the transmission lines and de-icing is required. Icing indicates that the ambient temperature is very low and may be accompanied by factors such as strong winds and rain. Therefore, it is necessary to take pictures of the icing situation of the cables from different angles and then conduct a comprehensive comparison to obtain the accurate icing situation. At this time, use a drone or other high-altitude shooting equipment to take pictures of the cables of the transmission lines from multiple angles to obtain the front view, 45-degree elevation view, and 45-degree top view of the transmission lines.

[0061] Perform perspective transformation on the 45-degree elevation view and 45-degree top view of the transmission lines from the front view angle to obtain the transformed elevation view and the transformed top view. Stitch the front view, the transformed elevation view, and the transformed top view to obtain the corrected front view;

[0062] To better observe the icing situation of the cables, it is necessary to convert all the images to the same angle for convenient comparison. Here, all the images are converted to the front view angle. By performing perspective transformation on the 45-degree elevation view and 45-degree top view with different transformation matrices, the images of the 45-degree elevation view transformed to the front view angle and the images of the 45-degree top view transformed to the front view angle can be obtained. Then, compare these two images with the front view to confirm whether there is icing at each location, and thus the accurate icing image of the cables at the front view angle can be obtained.

[0063] Perform threshold image segmentation and image feature extraction on the corrected front view to determine the icing thickness, icing shape, and the angle between the transmission line and the horizontal plane of the transmission lines, and obtain the thickness warning score, shape warning score, and angle warning score.

[0064] Threshold image segmentation has the characteristics of being intuitive and easy to implement, and can clearly show the gray levels of different regions of the image. By using a single threshold, bright objects and dark objects can be separated. The processed image after thresholding is defined as follows: Set a threshold. When the pixel gray value is greater than or equal to this threshold, the gray level of this pixel is marked as 1 and belongs to the object that needs attention. When the pixel gray value is less than this threshold, the gray level of this pixel is marked as 0 and belongs to the object that needs to be ignored. Image feature extraction is to find out the factor features related to icing warning from the image, and obtain the required factors for icing warning, namely icing thickness, icing shape, and the angle between the transmission line and the horizontal plane, through observation, calculation, etc. Then, determine which level these data belong to, so as to obtain the thickness warning score, shape warning score, and angle warning score, which is convenient for subsequent calculations.

[0065] The thickness warning score, shape warning score, and angle warning score are multiplied by their respective weight parameters to obtain the icing score, and whether to issue a warning prompt is judged based on the icing score.

[0066] The influence of the icing thickness, icing shape, and the angle between the transmission line and the horizontal plane on the normal operation of the transmission line is different. According to the influence of these factors on the performance of the transmission line, different influence factors are assigned to these factors. This influence factor is the weight parameter. Icing score = thickness warning score * thickness weight parameter + shape warning score * shape weight parameter + angle warning score * angle weight parameter. The icing score is compared with the preset warning score. When the icing score is greater than or equal to the warning score, a warning prompt is issued, so as to remind the management personnel to send someone to remove ice and ensure the normal operation of the transmission line. The higher the icing score, the more serious the icing of the transmission line.

[0067] Figure 2 For the second sub-process block diagram of the transmission line icing warning method based on image technology, in the embodiment of the present invention, the steps of performing perspective transformation of the 45-degree upward view and 45-degree downward view of the transmission line to the front view angle, obtaining the transformed upward view and the transformed downward view, and splicing the front view, the transformed upward view, and the transformed downward view to obtain the corrected front view include:

[0068] Perform perspective transformation of the 45-degree upward view to the front view angle using the first transformation matrix to obtain the transformed downward view;

[0069] The 45-degree upward view is an image taken from the 45-degree direction and from bottom to top. Select four points from the 45-degree upward view, know the coordinates of these four points, project these four points onto the front view plane in sequence, and the first transformation matrix can be obtained based on the change of the coordinates of these four points. All points in the 45-degree upward view are transformed using the first transformation matrix to obtain the transformed upward view.

[0070] Perform perspective transformation of the 45-degree top view to the front view angle using the second transformation matrix to obtain the transformed bottom view.

[0071] The 45-degree top view is an image taken from a 45-degree direction and from top to bottom. Select four points from the 45-degree top view, know the coordinates of these four points, project these four points onto the front view plane in sequence, and the second transformation matrix can be obtained based on the changes in the coordinates of these four points. Apply the second transformation matrix to all points in the 45-degree top view, and the transformed top view can be obtained.

[0072] Overlay the front view, the transformed bottom view, and the transformed top view together to obtain the corrected front view.

[0073] Due to the influence of factors such as light and air, some areas of the photo taken from one angle may be unclear. Overlaying the front view, the transformed bottom view, and the transformed top view can obtain the front view of the real scene to the greatest extent, so as to better judge the icing condition of the transmission line.

[0074] Figure 3 It is the third sub-process block diagram 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 to determine the icing thickness, icing shape, 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:

[0075] Perform threshold image segmentation on the corrected front view to obtain multiple segmented first corrected images;

[0076] Divide the corrected front view into multiple sub-images, and then perform threshold segmentation on each sub-image to obtain multiple first corrected images. Each first corrected image is a partial area of the corrected front view;

[0077] Perform feature extraction on the first corrected image to obtain multiple image features, and obtain the icing thickness, icing shape, and the angle between the transmission line and the horizontal plane based on the image features;

[0078] Each sub-image contains a partial area of the front view. The performance of the transmission line is affected by the icing thickness, icing shape, and the angle between the transmission line and the horizontal plane. For example, the greater the icing thickness and the larger the angle between the transmission line and the horizontal plane, the more difficult it is for the transmission line to transport electric energy and the greater the power loss, and the worse the performance of the transmission line. All the image features combined can indicate the icing thickness, icing shape, and the angle between the transmission line and the horizontal plane.

[0079] Compare the ice thickness, ice shape of the transmission line, and the angle between the transmission line and the horizontal plane with the preset grade ranges to obtain a thickness warning score, a shape warning score, and an angle warning score.

[0080] There are preset thickness warning scores corresponding to ice thickness ranges. The first thickness grade is 5 - 10 mm, and the corresponding thickness warning score is 0.2. The second thickness grade is 10 - 15 mm, and the corresponding thickness warning score is 0.3. The third thickness grade is 15 - 20 mm, and the corresponding thickness warning score is 0.4. The greater the ice thickness, the greater the difficulty of power transmission by the transmission line and the greater the degree of influence on the transmission line. The ice shapes are circular, oval, and irregular. Circular ice means that the degrees of being surrounded by ice above and below the cable are the same, and the transmission losses in all directions of the transmission line are roughly the same. At this time, the impact on the performance of the transmission line is the greatest. Oval ice means that the degrees of being surrounded by ice above and below the cable are different, and the transmission loss in the direction with smaller ice thickness of the transmission line is less than that in the direction with larger ice thickness. At this time, the impact on the performance of the transmission line is relatively large. Irregular ice means that the degrees of being surrounded by ice above and below each point in the cable length direction are different. At this time, the impact on the performance of the transmission line is relatively small. The shape warning score corresponding to circular ice is 0.6, the shape warning score corresponding to oval ice is 0.4, and the shape warning score corresponding to irregular ice 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, and even the ice has collapsed the transmission line. At this time, the impact on the performance of the transmission line is the greatest. It can be set that the angle warning score for 5 - 30 degrees is 0.3, the angle warning score for 30 - 60 degrees is 0.6, the angle warning score for 60 - 80 degrees is 0.8, and the angle warning score for 80 - 90 degrees is 1.

[0081] The steps of performing threshold image segmentation on the corrected front view to obtain multiple segmented first corrected views include:

[0082] Divide the corrected front view into different sub - images;

[0083] Divide the corrected front view into different regions according to a preset rule. Each region is a sub - image. Here, the corrected front view can be equally divided into four sub - images of up, down, left, and right according to the center, or equally divided into 4 - 8 parts in the order from left to right. The segmentation rule is determined according to the actual situation.

[0084] Perform segmentation on the sub - images using different thresholds to obtain multiple segmented first corrected views.

[0085] The situations of each sub-image are different, and different threshold methods need to be adopted to obtain a clear and error-free image better. The threshold methods include the single global threshold method, the double global threshold method, and the basic adaptive threshold method. The single global threshold method only needs to scan each pixel of the image one by one, and according to whether its gray value is greater than or less than the set threshold T, the pixel is correspondingly marked as an object or a background to achieve image segmentation. If the areas of the image background and the object are close, the initial value of T should be selected as the average gray value of the entire image; if the areas of the object and the background differ greatly, the initial value of T should be selected as a value such as the median of the gray values. The double global threshold method transforms the middle gray level into 1 and other gray levels into 0, and the middle gray level is the place where the gray value changes suddenly. The basic adaptive threshold method further divides the image into secondary sub-images, and then uses different thresholds to segment the secondary sub-images. This method is applicable to images with uneven gray levels everywhere.

[0086] The steps of extracting multiple image features from the first corrected image and obtaining the ice coating thickness, ice coating shape, and the angle between the transmission line and the horizontal plane based on the image features include:

[0087] Taking the center of the first corrected image as the origin, establishing coordinate axes, and obtaining the outermost coordinates of the cable and the outermost coordinates of the ice layer;

[0088] Establishing a coordinate system in each first corrected image, taking the center of the first corrected image as the origin, and measuring the distances between the outermost layer of the cable and the outermost layer of the ice layer and the origin of the coordinate axes, so that 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.

[0089] Based on the differences between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis, obtaining the ice coating thickness of the transmission line;

[0090] Subtracting 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 differences on each coordinate axis, and then taking the square root of the sum of the squares of the differences on each coordinate axis. The obtained arithmetic square root is the ice coating 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), and the ice coating thickness of the transmission line is f, f 2 =(a1 - a2) 2 +(b1 - b2) 2 .

[0091] Drawing 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 coating;

[0092] The cable is circular, so only the outer contour of the ice layer needs to be looked at to determine the shape of the ice coating. Mark the points on the outermost side of the ice layer, and the coordinates of the ice layer can be obtained. Then connect the points on the outermost side of the ice layer one by one, and the outer contour of the ice layer can be obtained. Based on the outer contour of the ice layer, determine which one of the circular, elliptical and irregular shapes the ice coating is.

[0093] Based on the shape and coordinates of the ice coating, obtain the angle between the transmission line and the horizontal plane.

[0094] Knowing the coordinates of the starting point and the ending point of the ice layer also means knowing the values of their coordinates on each coordinate axis. Simulate the ice coating curve, establish a right triangle, and use conventional mathematical methods to calculate the angle between the transmission line and the horizontal plane.

[0095] Figure 4 It is a structural block diagram of an ice coating warning system for transmission lines based on image technology. The system includes: an acquisition module, which is used to acquire 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, acquire the front view, 45-degree elevation view and 45-degree top view of the transmission line;

[0096] A transformation module, which is used to perform perspective transformation of the 45-degree elevation view and 45-degree top view of the transmission line at the front view angle to obtain the transformed elevation view and the transformed top view, and splice the front view, the transformed elevation view and the transformed top view to obtain the corrected front view;

[0097] An extraction module, which is used to perform threshold image segmentation and image feature extraction on the corrected front view to determine the ice coating thickness, ice coating shape and the angle between the transmission line and the horizontal plane of the transmission line, and obtain the thickness warning score, shape warning score and angle warning score;

[0098] A judgment module, which is used to multiply the thickness warning score, shape warning score and angle warning score by their respective weight parameters to obtain the ice coating score, and judge whether to issue a warning prompt based on the ice coating score.

[0099] Figure 5 It is a structural block diagram of the transformation module in an ice coating warning system for transmission lines based on image technology. The transformation module includes:

[0100] The first transformation unit is used to perform perspective transformation of the 45-degree elevation view at the front view angle using the first transformation matrix to obtain the transformed top view;

[0101] The second transformation unit is used to perform perspective transformation of the 45-degree top view at the front view angle using the second transformation matrix to obtain the transformed elevation view;

[0102] A coincidence unit for combining the front view, the transformed bottom view, and the transformed top view together to obtain a corrected front view.

[0103] Figure 6 It is a structural block diagram of an extraction module in a transmission line icing warning system based on image technology. The extraction module includes:

[0104] A segmentation unit for performing threshold image segmentation on the corrected front view to obtain a plurality of segmented first corrected images;

[0105] An extraction unit for extracting features from the first corrected images to obtain a plurality of image features, and obtaining the icing thickness, icing shape of the transmission line, and the angle between the transmission line and the horizontal plane based on the image features;

[0106] A comparison unit for comparing the icing thickness, icing shape of the transmission line, and the angle between the transmission line and the horizontal plane with a preset grade range to obtain a thickness warning score, a shape warning score, and an angle warning score.

[0107] The comparison unit includes:

[0108] A coordinate establishment unit for taking the center of the first corrected image as the origin, establishing coordinate axes, and obtaining the outermost coordinates of the cable and the outermost coordinates of the ice layer;

[0109] A thickness generation unit for obtaining the icing thickness of the transmission line based on the differences between the outermost coordinates of the cable and the outermost coordinates of the ice layer on each coordinate axis;

[0110] A shape generation unit for drawing 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 coating;

[0111] An angle generation unit for obtaining the angle between the transmission line and the horizontal plane based on the shape and coordinates of the ice coating.

[0112] The segmentation unit includes:

[0113] A sub-image generation unit for dividing the corrected front view into different sub-images;

[0114] A corrected image generation unit for segmenting the sub-images with different thresholds to obtain a plurality of segmented first corrected images.

[0115] All functions that can be achieved by the transmission line icing warning method based on image technology are completed by a computer device. The computer device includes one or more processors and one or more memories. At least one program code is stored in the one or more memories, and the program code is loaded and executed by the one or more processors to implement the functions of the user behavior prediction method based on big data.

[0116] The processor fetches instructions from the memory one by one, analyzes the instructions, and then performs corresponding operations according to the requirements of the instructions, generating a series of control commands to make each part of the computer act automatically, continuously and coordinately, becoming an organic whole, realizing the input of the program, the input of data, as well as the operation and output of results. All arithmetic or logical operations generated during this process are completed by the arithmetic unit; the memory includes a read-only memory (ROM), and the read-only memory is used to store computer programs, and a protection device is provided outside the memory.

[0117] Exemplarily, the computer program can be divided into one or more modules, and one or more modules are stored in the memory and executed by the processor to complete the present invention. One or more modules can be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0118] Those skilled in the art can understand that the description of the above service device is only an example and does not constitute a limitation on the terminal device. It may include more or fewer components than the above description, or combine some components, or different components. For example, it may include input / output devices, network access devices, buses, etc.

[0119] The so-called processor may be a central processing unit (CPU), or may also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The above processor is the control center of the above terminal device, and uses various interfaces and lines to connect all parts of the entire user terminal.

[0120] The above-mentioned memory can be used to store computer programs and / or modules. By running or executing the computer programs and / or modules stored in the memory, and calling the data stored in the memory, the above-mentioned terminal device can realize various functions. The memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function (such as the function of displaying information collection templates, the function of publishing product information, etc.); the data storage area can store data created according to the use of the berth status display system (such as product information collection templates corresponding to different product types, product information to be published by different product providers, etc.). In addition, the memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disks, memory, plug-in hard disks, smart media cards (SMC), secure digital (SD) cards, flash cards, at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.

[0121] If the modules / units integrated in the terminal device are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, to implement all or part of the modules / units in the above-mentioned embodiment system of the present invention, it can also be completed by instructing relevant hardware through a computer program. The above-mentioned computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can realize the functions of the above-mentioned various system embodiments. Among them, the computer program includes computer program code, and the computer program code can be in the form of source code, object code, executable file or some intermediate form, etc. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signal, telecommunication signal, and software distribution medium, etc.

[0122] It should be noted that in this article, the term "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such a process, method, article or device. Without more limitations, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0123] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly 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 an ice coverage score, and whether to issue an early warning prompt is determined according to the ice coverage score. The steps of performing threshold image segmentation and image feature extraction on the corrected front view to determine the ice coverage thickness, ice coverage shape and 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 of the transmission line are compared with a preset level range to obtain a thickness warning score, a shape warning score and an angle warning score. 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, the first corrected images are subjected to feature extraction to obtain a plurality of image features, and the steps of deriving 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 include: 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 coordinates of the outermost layer of the cable and the outermost layer of the ice layer on each coordinate axis: the coordinates of the outermost layer of the ice layer on each coordinate axis minus the coordinates of the outermost layer of the cable on each coordinate axis, and the difference on each coordinate axis is obtained. Then, the square root of the sum of the squares of the differences on each coordinate axis is taken, and the arithmetic square root obtained is the ice thickness of the transmission line. 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: mark the outermost points of the ice layer to obtain the coordinates of the ice layer, and then connect the outermost points of the ice layer one by one to obtain the outer contour of the ice layer. According to the outer contour of the ice layer, determine whether the shape of the ice cover is circular, elliptical or irregular. Based on the shape and coordinates of the ice cover, the angle between the transmission line and the horizontal plane is obtained: the ice cover curve is simulated, a right triangle is established, and the angle between the transmission line and the horizontal plane is calculated using conventional mathematical methods.

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. 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; A judgment module is used to multiply the thickness warning score, the shape warning score and the angle warning score by their respective weight parameters to obtain an ice coverage score, and to determine whether to issue a warning prompt according to the ice coverage score. The extraction module includes: 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; A 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. The segmentation unit includes: 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-image using different thresholds to obtain a plurality of segmented first correction images, and the comparison unit includes: 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; The 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: the coordinates of the outermost layer of the ice layer on each coordinate axis minus the coordinates of the outermost layer of the cable on each coordinate axis, to obtain the difference on each coordinate axis, and then the square root of the sum of the squares of the differences on each coordinate axis is taken, and the arithmetic square root obtained is the ice thickness of the transmission line; The shape generation unit is used to draw the outer contour of the ice layer according to the outermost coordinates of the ice layer, and obtain the shape and coordinates of the ice cover: mark the outermost points of the ice layer to obtain the coordinates of the ice layer, and then connect the outermost points of the ice layer one by one to obtain the outer contour of the ice layer, and judge whether the shape of the ice cover is circular, elliptical or irregular according to the outer contour of the ice layer; The angle generation unit is used to obtain the angle between the transmission line and the horizontal plane based on the shape and coordinates of the ice cover: simulate the ice cover curve, establish a right triangle, and use conventional mathematical methods to calculate the angle between the transmission line and the horizontal plane.

4. The power transmission line icing warning system based on image technology according to claim 3 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.

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