CN107895365B - Image matching method and monitoring system for power transmission channel external damage protection - Google Patents
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Abstract
The invention discloses an image matching method and a monitoring system for outer damage protection of a power transmission channel, wherein the system comprises a plurality of monitoring modules and a control center, the monitoring modules comprise a power module, an acousto-optic alarm module, an image monitoring module, a main control system and a communication module, and the image monitoring module detects images of line channels on two sides of an iron tower and transmits the images to the main control system; the main control system adopts an image matching method based on a Haar feature density map to detect hidden dangers, and informs an acousto-optic alarm module to give an alarm when the hidden dangers are detected; the invention adopts Haar characteristic density graph filtering, can effectively remove discrete pixel points which are failed to be matched and caused by micro disturbance, ensures that a large connected domain is not lost, and can well keep the discrete points inside and around the large connected domain to be matched with the pixel image.
Description
Technical Field
The invention relates to an image matching method and a monitoring system for power transmission channel outer damage protection.
Background
With the development of national economy, the demand of various industries on electric power is continuously expanded, and the loss caused by power failure caused by various human and natural accidents is more and more large. How to find, process and prevent natural disasters and accidents damaging the power transmission line in advance and ensure normal power supply all the time becomes the focus of attention of people.
At present, in many places of China, an image/video monitoring device is mounted on a tower of each high-voltage transmission line to monitor the line channel environment, so that the traditional manual line patrol is replaced. The original image/video monitoring has short service life, low reliability and unintelligent hidden danger detection. The on-site image/video monitoring device transmits the shot video back to the server, and then hidden dangers are eliminated through manual observation, so that the workload is very large, the subjectivity is strong, and the efficiency is low.
With the development of intelligent information processing technology, people begin to explore methods for security detection by using image matching technology, and certain progress is made. However, because the power transmission lines or the channels are mostly arranged in a complex field scene, and the meteorological conditions are not good, the tower itself can shake to a certain extent, especially for a large iron tower with a high voltage level, the shaking range is larger, the target in the background can shake or wave, the weather, the cloud, the illumination and the like can influence the photo shooting effect, the affected image is obtained, and the protection effect on the external damage of the power transmission channel is not good.
Disclosure of Invention
The invention provides an image matching method and a monitoring system for power transmission channel external damage protection, aiming at solving the problems.
In order to achieve the purpose, the invention adopts the following technical scheme:
the image matching method for the outer damage protection of the power transmission channel comprises the following steps:
(1) carrying out difference processing on the image to be matched and the reference image to obtain a difference image;
(2) carrying out binarization processing on the image;
(3) calculating Haar characteristics of the difference image after binarization to obtain a corresponding Haar characteristic density graph;
(4) and filtering the binarized image based on the Haar feature density graph to obtain a final matching result.
In the step (1), the image to be matched and the reference image are converted into four color spaces of RGB, HSV, YUV and Lab, and differential images are respectively obtained in the four color spaces.
In the step (2), the difference images of the channels except the difference image of the hue channel are weighted and fused.
Further, separating the channels, and performing weighted fusion on the remaining 11 channel difference images except the difference image of the H channel, wherein the fusion process is as follows:
wherein, Il(x, y) represents the pixel value of image I at coordinate (x, y) in the differential image of the l-th channel; f (x, y) represents a pixel value of the fused image F at the coordinates (x, y); n represents the number of images needing to be fused; k is a radical ofiSize of the dimension Window, αiThe weight of the scale is expressed, N is 11.
Further, in the step (3), the binarization processing includes:
(3-1) counting the number of pixels of each gray level in the image, and carrying out normalization processing on the number of pixels;
(3-2) determining an optimal threshold value of binarization according to the statistical pixel quantity normalization result;
and (3-3) carrying out gray level binarization processing on the image according to the determined optimal threshold value.
In the step (3-2), according to the normalization result of the number of pixels of the gray level, the background probability and the foreground probability and the corresponding gray mean value at each threshold are determined, the background and foreground variances, the between-class variance and the within-class variance are obtained, and the threshold with the largest between-class variance and the smallest within-class variance is determined as the optimal threshold.
In the step (4), for the binary image, the gray difference feature of the Haar feature is regarded as binary jump between pixels.
In the step (4), the Haar feature templates are as follows:
gcrepresenting a pixel with a grey value of 255, gpIs gcEight neighborhoods of; gpValue of (a) and gcPoint g, when not identicalcPlus one.
In the step (4), the specific process of obtaining the Haar feature density map of the image comprises the following steps:
(4-1) constructing a two-dimensional image H with the same size as the fused differential image, and assigning all pixel values in the image to be 0;
and (4-2) taking the Haar feature number of the pixels in the differential image after binarization as the gray value of the pixels at the corresponding position in the image H, wherein the image H is the Haar feature density map of the differential image.
In the step (4), the filtering process includes:
(4-a) counting the number of effective pixels and the number of Haar features in a window with the width L by taking the pixel P as a center;
(4-b) taking the ratio of the number of Haar features to the number of effective pixels within the window as the Haar feature frequency of the pixel P.
The utility model provides a monitoring system of outer broken protection of transmission channel, includes a plurality of monitoring module and control center, monitoring module all includes power module, reputation warning module, image monitoring module, main control system and communication module, wherein:
the power supply module provides electric energy for the integral monitoring module;
the image monitoring module is configured to be arranged on an iron tower of each power transmission line, detect images of line channels on two sides of the iron tower and transmit the images to the main control system;
the main control system is configured to control the acquisition control of the image detection module, detect hidden danger by adopting the image matching method, and inform the acousto-optic alarm module to give an alarm when the hidden danger is detected;
the communication module is configured to provide a communication channel for the main control system and the control center, transmit and feed back the hidden danger information, and encrypt data of the transmitted and fed-back information by using an MD5 algorithm;
the control center is configured to receive and display data of the monitoring modules, and realize distribution visualization, line channel image visualization and real-time alarm of each monitoring module.
Further, power module includes power supply module and power storage module, the power supply module adopts solar cell panel to carry out the electric energy collection, links to each other with main control system, and power storage module includes battery and super capacitor, stores the electric energy that the module was gathered with the power supply, links to each other with main control system.
Furthermore, the acousto-optic warning module comprises a tweeter and a light flashing device.
Furthermore, the monitoring module also comprises a temperature measuring module, the communication mode between the monitoring module and the master control system is a wireless communication mode, and the temperature of the electric transmission line lead, the strain clamp and/or the drainage plate is measured.
Furthermore, the image monitoring module adopts a photographing lens with physical pixels larger than 500 ten thousand pixels, comprises two lenses, respectively monitors line channels on two sides of the iron tower, and is connected with the main control system.
Further, the main control system comprises a control unit and a data preprocessing unit, wherein the control unit is configured to perform photographing control, communication module, temperature measurement control, video control, power control and acousto-optic alarm control; the data preprocessing unit is configured to perform hidden danger detection by adopting an image matching method based on a Haar feature density map.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention adopts Haar characteristic density graph filtering, can effectively remove discrete pixel points which are failed to be matched and caused by micro disturbance, can well keep the discrete points inside and around the large connected domain and can be matched with pixel images while ensuring no loss of the large connected domain;
(2) the invention has good description capacity for the discrete and dense degrees of the pixels by utilizing the Haar characteristic density graph, so that the Haar characteristic density graph can be utilized to filter the image to filter discrete noise points, and the super-pixel-level matching of local fine non-rigid change areas in the pixel-level matching result is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a flow chart of an efficient algorithm of the present invention;
FIG. 2 is a difference image and Haar feature density map after binarization;
FIG. 3 shows the filtering results obtained by different methods;
fig. 4 is a visual monitoring device for protection against external damage to a power transmission channel.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As introduced in the background art, the prior art has the disadvantages of short service life, low reliability and unintelligent hidden danger detection due to the existence of original image/video monitoring. The on-site image/video monitoring device transmits shot videos back to the server, hidden dangers are eliminated through manual observation, the workload is very large, the subjectivity is strong, the efficiency is low, and in order to solve the technical problems, the visual monitoring device and the data processing method for the outer damage protection of the power transmission channel are provided.
In an exemplary embodiment of the present application, as shown in fig. 4, the following aspects are mainly included:
1. installing a power supply module, a power storage module, an acousto-optic alarm module, a temperature measurement module, an image monitoring module, a main control system and a communication module on a power transmission line iron tower;
2. deploying the power transmission line visualization system on a server;
3. opening a VPN channel, and communicating an Internet of things card installed on a debugging device with data of a power transmission line visualization system;
4. setting device acquisition parameters, which mainly comprise an acquisition time period, an acquisition cycle, a line name, a pole tower name, a card number, an installation date, attention hidden danger types and the like;
5. the device starts a photographing function, and the photo is transmitted to the power transmission line visualization system through the data preprocessing unit and the VPN channel.
6. The data preprocessing unit carries out hidden danger detection on the channel image by adopting an image matching method based on a Haar feature density graph, and when hidden danger information exists in the image, the device sends alarm information to a power transmission line visualization system, otherwise normal information is transmitted.
As shown in FIG. 1, the image matching method based on the Haar feature density map comprises the following steps:
step 1: calculating a difference image of the image to be matched and the reference image;
the first step is as follows: converting the image to be matched and the reference image into four color spaces of RGB, HSV, YUV and Lab, and obtaining a differential image in the four color spaces;
the second step is that: separating channels, and performing weighted fusion on the rest 11 channel differential images except the differential image of the H channel, wherein the fusion process is as follows:
wherein, Il(x,y) Representing the pixel value of image I at coordinate (x, y) in the differential image of the ith channel; f (x, y) represents a pixel value of the fused image F at the coordinates (x, y); n represents the number of images needing to be fused; k is a radical ofiSize of the dimension Window, αiThe weight of the scale is expressed, and in this patent, N is 11, k is {1,2,3}, and α is {0.1,0.2,0.7 }.
Step 2: binaryzation;
the first step is as follows: counting the number of pixels with a gray level i in the image, which is recorded as niFor computational convenience, the normalization process is as follows:
wherein M represents the gray level of the image, such as 256 for 8-bit single-channel image gray level M;
the second step is that: calculating a binarization threshold value t (t is more than or equal to 1 and less than or equal to M):
w0representing the background probability with threshold t, w1Is the foreground probability;
μ0(t) represents the threshold and the background mean value of the gray level at t, μ1(t) is the gray level mean of the foreground;
w 2＝w0 0 2+w1 1 2
B 2＝w0*(u0(t)-u)2+w1*(u1(t)-u)2
wherein0 2Which represents the variance of the background,1 2which represents the variance of the foreground and the variance of the foreground,B 2the inter-class variance is represented as,W 2representing the intra-class variance, and u representing the overall mean of the image; make itB 2At the maximum, the number of the first,W 2the minimum threshold value t is the optimal threshold value;
the third step: and after the optimal threshold t is obtained through calculation, binarization is carried out according to the optimal threshold t, the gray value larger than t is set to be 1, the gray value smaller than t is set to be 0, and image binarization is completed.
And step 3: calculating Haar characteristics of the difference image after binarization;
the Haar characteristic is a description method of gray difference characteristics of a rectangular region in an image, and for a binary image, the gray difference characteristics can be regarded as binary jump among pixels; haar feature templates are as follows:
gcrepresenting a pixel with a grey value of 255, gpIs gcEight neighborhoods of; gpValue of (a) and gcPoint g, when not identicalcPlus one.
And 4, step 4: obtaining a Haar characteristic density graph of the image;
the first step is as follows: constructing a two-dimensional image H with the same size as the fused differential image, and assigning all pixel values in the image as 0;
the second step is that: and taking the Haar feature number of the pixels in the difference image after binarization as the gray value of the pixels at the corresponding position in the image H, wherein the image H is the Haar feature density map of the difference image.
And 5: filtering the image based on the Haar feature density graph;
the first step is as follows: counting the number N of effective pixels and the number M of Haar features in a window with the width of L by taking a pixel P as a center;
the second step is that: and calculating Q-M/N (when N is not equal to 0) as the Haar characteristic frequency of P. The calculation process is as follows:
q is a Haar characteristic frequency number graph of B obtained through calculation, and the value range of pixel values in Q is [0,8 ]. And B is a binary image to be filtered, the value of the pixel value of the binary image is {0,1}, 0 represents a black pixel, and 1 represents a white pixel (effective pixel). H is a Haar feature density map of B. l is the size of the filter window, and is 25 in this patent.
7. The communication module is connected with the main control system and comprises a data encryption module and a wireless communication module. The data encryption module encrypts data by adopting an MD5 algorithm; the wireless communication module transmits data in a mode of a communication operator Internet of things card and a VPN channel;
8. the power transmission line visualization system is a background master station system, receives and displays data of the front-end device, and comprises device distribution visualization, line channel visualization, device management and alarm query.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (13)
1. The image matching method for the outer damage protection of the power transmission channel is characterized by comprising the following steps: the method comprises the following steps:
(1) carrying out difference processing on the image to be matched and the reference image to obtain a difference image; the image to be matched is an acquired image for detecting line channels on two sides of the iron tower;
(2) carrying out binarization processing on the image;
(3) calculating Haar characteristics of the difference image after binarization to obtain a corresponding Haar characteristic density graph;
the binarization processing includes:
(3-1) counting the number of pixels of each gray level in the image, and carrying out normalization processing on the number of pixels;
(3-2) determining an optimal threshold value of binarization according to the statistical pixel quantity normalization result;
(3-3) carrying out gray level binarization processing on the image according to the determined optimal threshold value;
(4) and filtering the binarized image based on the Haar feature density graph to obtain a final matching result.
2. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 1, wherein: in the step (1), the image to be matched and the reference image are converted into four color spaces of RGB, HSV, YUV and Lab, difference images are respectively obtained in the four color spaces, and the difference images of the other channels except the difference image of the hue channel H are subjected to weighted fusion.
3. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 2, wherein: separating channels, and performing weighted fusion on the rest 11 channel differential images except the differential image of the H channel, wherein the fusion process is as follows:
wherein, Il(x, y) represents the pixel value of image I at coordinate (x, y) in the differential image of the l-th channel; f (x, y) represents the fused image at coordinates (x, y)A pixel value of F; n represents the number of images needing to be fused; k is a radical of1、k2、k3Size of the dimension Window, α1、α2、α3The weight of the scale is expressed, N is 11.
4. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 1, wherein: in the step (3-2), according to the normalization result of the number of pixels of the gray level, the background probability and the foreground probability and the corresponding gray mean value at each threshold are determined, the background and foreground variances, the between-class variance and the within-class variance are obtained, and the threshold with the largest between-class variance and the smallest within-class variance is determined as the optimal threshold.
5. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 1, wherein: in the step (4), for the binary image, the gray difference feature of the Haar feature is regarded as binary jump between pixels.
6. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 5, wherein: in the step (4), the Haar feature templates are as follows:
gcrepresenting a pixel with a grey value of 255, gpIs gcEight neighborhoods of; gpValue of (a) and gcPoint g, when not identicalcPlus one.
7. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 1, wherein: in the step (4), the specific process of obtaining the Haar feature density map of the image comprises the following steps:
(4-1) constructing a two-dimensional image H with the same size as the fused differential image, and assigning all pixel values in the image to be 0;
and (4-2) taking the Haar feature number of the pixels in the differential image after binarization as the gray value of the pixels at the corresponding position in the image H, wherein the image H is the Haar feature density map of the differential image.
8. The image matching method for the outer power transmission channel protection against the damage as claimed in claim 1, wherein: in the step (4), the filtering process includes:
(4-a) counting the number of effective pixels and the number of Haar features in a window with the width L by taking the pixel P as a center;
(4-b) taking the ratio of the number of Haar features to the number of effective pixels within the window as the Haar feature frequency of the pixel P.
9. A monitoring system for outer broken protection of a power transmission channel is characterized in that: including a plurality of monitoring module and control center, monitoring module all includes power module, reputation warning module, image monitoring module, main control system and communication module, wherein:
the power supply module provides electric energy for the integral monitoring module;
the image monitoring module is configured to be arranged on an iron tower of each power transmission line, detect images of line channels on two sides of the iron tower and transmit the images to the main control system; the image monitoring module comprises two lenses, monitors line channels on two sides of the iron tower respectively and is connected with the main control system;
the main control system is configured to control the acquisition control of the image detection module, detect hidden danger by adopting the image matching method according to any one of claims 1 to 8, and inform the acousto-optic alarm module to alarm when the hidden danger is detected;
the communication module is configured to provide a communication channel for the main control system and the control center, transmit and feed back the hidden danger information, and encrypt data of the transmitted and fed-back information by using an MD5 algorithm;
the control center is configured to receive and display data of the monitoring modules, and realize distribution visualization, line channel image visualization and real-time alarm of each monitoring module.
10. The monitoring system of claim 9, wherein: the power module comprises a power supply module and a power storage module, the power supply module adopts a solar cell panel to collect electric energy and is connected with the main control system, the power storage module comprises a storage battery and a super capacitor, and the electric energy collected by the power supply module is stored and is connected with the main control system.
11. The monitoring system of claim 9, wherein: the acousto-optic warning module comprises a tweeter and a light flashing device.
12. The monitoring system of claim 9, wherein: the monitoring module further comprises a temperature measuring module, the communication mode between the monitoring module and the master control system is a wireless communication mode, and the temperature of the transmission line lead, the strain clamp and/or the drainage plate is measured.
13. The monitoring system of claim 9, wherein: the main control system comprises a control unit and a data preprocessing unit, wherein the control unit is configured to perform photographing control, a communication module, temperature measurement control, video control, power control and acousto-optic alarm control; the data preprocessing unit is configured to perform hidden danger detection by adopting an image matching method based on a Haar feature density map.
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| CN112150385B (en) * | 2020-09-29 | 2023-05-12 | 四川虹美智能科技有限公司 | Infrared image filtering method and device |
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Application publication date: 20180410 Assignee: SHANDONG ZHONGSHI YITONG GROUP Co.,Ltd. Assignor: ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER Co. Contract record no.: X2024980000274 Denomination of invention: An Image Matching Method and Monitoring System for External Damage Protection of Transmission Channels Granted publication date: 20200818 License type: Common License Record date: 20240108 |
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