CN114909990B - Vehicle-mounted non-contact line abrasion measuring method, device and system - Google Patents
Vehicle-mounted non-contact line abrasion measuring method, device and system Download PDFInfo
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- 238000005299 abrasion Methods 0.000 title claims abstract description 46
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- 238000005259 measurement Methods 0.000 abstract description 7
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M1/00—Power supply lines for contact with collector on vehicle
- B60M1/12—Trolley lines; Accessories therefor
- B60M1/28—Manufacturing or repairing trolley lines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
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Abstract
The invention provides a vehicle-mounted non-contact line abrasion measuring method, device and system. According to the method, the contact line bottom profile curve picture is obtained, and the window range of the contact line bottom profile curve picture is narrowed by [ OffsetX-range X, offsetX+range X ] after the pull-out value OffsetX of the contact line is obtained according to the position of the contact line bright spots in the picture; judging left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom of the contact line and calculating the number of pixels occupied by the contact line in the picture; and calculating the corresponding actual abrasion value through the number of pixels and storing the actual abrasion value. The invention can carry out online non-contact monitoring on the train state in the operation process and send out alarm to record the abrasion value and position information aiming at the contact line with larger abrasion, thereby reducing manual measurement, efficiently obtaining the numerical value and finding out the defect.
Description
Technical Field
The invention relates to the technical field of contact net detection, in particular to a vehicle-mounted non-contact line abrasion measuring method, device and system.
Background
In the electrified contact line, a transmission line erected along the upper space of a steel rail is called a contact net, and the function of the transmission line is to directly transmit electric energy obtained from a traction substation to an electric locomotive for use. The electric locomotive is directly contacted with the contact line through a pantograph arranged on the roof to take current, and the pantograph and the contact line must be reliably contacted in order to ensure that the locomotive can obtain continuous and stable current. Therefore, the quality and geometric parameters of the contact net directly influence the transportation capacity of the electrified railway, and ensuring that the contact line is in a normal working area has important significance for improving the current receiving quality and guaranteeing the power supply safety of the locomotive.
In recent years, urban contact line traffic is rapidly developed, and subway light rails are popular as vehicles for people to go out daily. The reliability of the subway traction power supply system equipment and the safety in the running process are important guarantees of the safe running of the whole subway series, and in order to guarantee the safe running of an operation vehicle, it is particularly important to detect abrasion of the contact network in a high-speed running state and to improve the safety of urban contact line traffic operation by adopting a more intelligent, rapid and reliable high-end detection technology.
If a detecting structure can be provided, the detecting structure can truly and accurately reflect the abrasion change of the contact line in the running process of the train without affecting the original structure of the pantograph, and has real-time performance. Therefore, a vehicle-mounted non-contact line abrasion measurement method, device and system are needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a vehicle-mounted non-contact type contact line abrasion measuring method, device and system, which are used for solving the problems that the original structure of a pantograph is not affected by a detection structure, the contact line abrasion change in the running process of a train can be truly and accurately reflected, and the real-time performance is realized.
In one aspect, a method for measuring contact line wear on a vehicle includes:
acquiring a contact line bottom profile curve picture, wherein the contact line bottom profile curve is obtained by a high-definition area array camera with an 808nm optical filter arranged in front of a lens after being irradiated on a contact line through a line laser to form a contact line profile curve;
obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spot in the contact line bottom profile curve picture;
according to the contact line bottom contour curve picture and the gray level picture, gray level values which account for more than 80% of the gray level picture distribution are obtained, and average gray level value Ave is obtained and used as background gray level value;
according to the pull-out value OffsetX of the contact line, performing window range narrowing operation on the contact line bottom profile curve picture by using [ OffsetX-range X, offsetX+range X ];
judging left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom of the contact line;
calculating the number of pixels occupied by the contact line in the picture through the left and right boundaries of the outline of the bottom surface of the contact line;
and calculating the corresponding actual abrasion value through the number of pixels and storing the actual abrasion value.
Further, a contact line bottom profile curve picture is obtained, wherein in the step of obtaining the contact line bottom profile curve by a high-definition area array camera with an 808nm optical filter arranged in front of a lens after the contact line bottom profile curve is formed on a contact line through irradiation of a line laser, 808nm invisible light is selected.
Further, according to the position of the contact line bright spot in the contact line bottom profile curve picture, obtaining the pull-out value OffsetX of the contact line includes:
firstly, irradiating a line laser on a contact line to form a short arc bright area;
and then, acquiring and shooting the displayed short arc bright area picture of the contact line by a high-speed area array camera. Combining template matching, and calculating to obtain the pixel coordinate position of the short arc bright area;
and finally, solving a matrix relation between physical coordinate values and pixel coordinate values by means of a checkerboard calibration plate, and completing conversion of the pixel coordinates and the space physical coordinates of the short arc bright area.
Further, according to the pull-out value OffsetX of the contact line, in the step of performing the window-narrowing operation on the contact line bottom profile curve picture by using [ OffsetX-range x, offsetx+range x ], the range x corresponds to the size of the viewing angle window required for accurately identifying the contact line profile; rangeX is provided for the purpose of focusing the view window onto a block area of the full picture.
Further, judging the left and right boundaries of the contact line bottom surface profile in the contact line bottom profile curve picture includes:
one of the methods is as follows: according to a background gray value Ave obtained by calculating an area array camera picture, if gray values of pixel points with continuous 5 center point pixel coordinates of X1 are all kept at Ave, and pixel points with right 5 center point pixel coordinates of X2 are all higher than Ave, the center pixel point X2 is the left boundary of the outline of the bottom surface of the contact line; if the gray values of the pixel points with the coordinates of X1 of the continuous 5 center points are all kept at Ave, and the continuous pixel points with the coordinates of X3 of the left 5 center points are all higher than Ave, the center pixel point X3 is the right boundary of the outline of the bottom surface of the contact line;
if the gray value of the pixel point with the pixel coordinate of X1 of the continuous 5 center points is higher than Ave, and the gray value of the continuous point with the pixel coordinate of X2 of the right 5 center points is higher than the gray value of X1, and the deviation is larger than delta A, the center pixel point X2 is the left boundary of the outline of the bottom surface of the contact line; if the gray value of the pixel points with the continuous 5 central point pixel coordinates of X1 is higher than Ave, and the gray value of the continuous points with the left 5 central point pixel coordinates of X3 is higher than the gray value of X1 and the deviation is greater than delta A, the central pixel point X3 is the right boundary of the outline of the bottom surface of the contact line;
the brightness of the contact line abrasion area is high, the gray value is 255, and the delta A is set to be 100-150.
On the other hand, the invention also provides a vehicle-mounted non-contact line abrasion measuring device, which comprises:
the acquisition unit is used for acquiring a contact line bottom profile curve picture, wherein the contact line bottom profile curve is obtained by a high-definition area array camera with an 808nm optical filter arranged in front of a lens after being irradiated on a contact line through a line laser to form a contact line profile curve;
the first calculation unit is used for obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spot in the contact line bottom profile curve picture;
the second calculation unit is used for calculating gray values which account for more than 80% of the gray map distribution according to the combination of the contact line bottom profile curve picture and the gray map, and calculating an average gray value Ave as a background gray value;
the first processing unit is used for performing window range narrowing operation on the contact line bottom profile curve picture according to the pull-out value OffsetX of the contact line by using [ OffsetX-range X, offsetX+range X ];
the judging unit is used for judging the left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom surface of the contact line;
a third calculation unit for calculating the number of pixels occupied by the contact line in the picture through the left and right boundaries of the outline of the bottom surface of the contact line;
and the second processing unit is used for calculating the corresponding actual abrasion value through the pixel number and storing the actual abrasion value.
In addition, the invention also provides a vehicle-mounted non-contact line abrasion measuring system, which comprises a vehicle roof monitoring system and an in-vehicle computing and processing system;
the roof monitoring system comprises a laser imaging module and an image acquisition module; the laser imaging module comprises a high-power 808nm line laser generator which is arranged on the roof of the vehicle and is perpendicular to the contact line; the image acquisition module comprises a high-speed linear array camera assembled on the roof and matched with the linear laser generator and a camera lens with an optical filter;
the in-vehicle computing processing system comprises an industrial personal computer module and a wireless transmission module; the industrial personal computer module is a high-function industrial personal computer; the wireless transmission module is a 4G router and an antenna, and the high-function industrial personal computer is connected with the 4G router through an Ethernet.
The roof monitoring system is used for collecting and transmitting images; the in-vehicle computing processing system is used for processing, analyzing and calculating pictures acquired by the vehicle roof detection system and storing the values to upload the values to the cloud;
the laser imaging module is used for laser irradiation to present a contour curve of the bottom surface of the contact line on the contact line;
the image acquisition module is used for acquiring contour curve images of the line laser irradiated on the contact line and shooting the contour curve images of the line laser irradiated from the rear side of the high-speed area array camera at the rear side of the laser;
the industrial personal computer module is used for acquiring a contact line bottom profile curve picture, wherein the contact line bottom profile curve is irradiated on a contact line through a line laser to form a contact line profile curve, and then is acquired by a high-definition area array camera with an 808nm optical filter arranged in front of a lens; obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spot in the contact line bottom profile curve picture; according to the contact line bottom contour curve picture and the gray level picture, gray level values which account for more than 80% of the gray level picture distribution are obtained, and average gray level value Ave is obtained and used as background gray level value; according to the pull-out value OffsetX of the contact line, performing window range narrowing operation on the contact line bottom profile curve picture by using [ OffsetX-range X, offsetX+range X ]; judging left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom of the contact line; calculating the number of pixels occupied by the contact line in the picture through the left and right boundaries of the outline of the bottom surface of the contact line; calculating the corresponding actual abrasion value through the number of pixels and storing the actual abrasion value;
and the wireless transmission module is used for uploading the data to the cloud through the router.
The beneficial effects of the invention are as follows: the vehicle-mounted non-contact type contact line abrasion measuring method, device and system provided by the invention can be used for carrying out online non-contact type monitoring on the train state in the operation process by using a non-contact dynamic contact line abrasion condition detecting system and sending out alarm for recording the abrasion value and position information aiming at the contact line with larger abrasion, thereby reducing manual measurement, efficiently obtaining values and finding defects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a vehicle-mounted non-contact line abrasion measurement method according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a vehicle-mounted non-contact line abrasion measuring device according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a vehicle-mounted non-contact line abrasion measurement system according to an embodiment of the present invention;
fig. 4 is a schematic distribution diagram of a vehicle-mounted non-contact line abrasion measurement system according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an in-vehicle computing system of the on-vehicle non-contact line abrasion measurement system according to an embodiment of the present invention;
fig. 6 is a schematic diagram of a vehicle-mounted non-contact type contact line abrasion measurement system roof monitoring system according to an embodiment of the present invention.
Illustration of: 1-an Ethernet network cable; 2-an industrial personal computer; a 3-4G router; 4-antennas; 5-contact line; 6-high-speed line cameras; 7-line laser.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The following describes in detail the technical solutions provided by the embodiments of the present invention with reference to the accompanying drawings.
Referring to fig. 1, a vehicle-mounted non-contact line abrasion measurement method includes:
s101, acquiring a contact line bottom profile curve picture.
In this embodiment, the contact line bottom profile curve is obtained by a high-definition area camera with an 808nm optical filter arranged in front of a lens after being irradiated on a contact line by a line laser to form a contact line profile curve; the 808nm invisible light is selected, because the visible light in nature can influence an imaging system, 808nm infrared light is used for avoiding the influence factors, and the band infrared light has the advantages of high power, high electro-optical conversion efficiency, high reliability, long service life, small volume and low cost, and only the 808nm light is focused, and other environmental influence factors are effectively controlled.
S102, obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spots in the contact line bottom profile curve picture.
In this embodiment, first, a line laser irradiates on a contact line to form a short arc bright region; and then, acquiring and shooting the displayed short arc bright area picture of the contact line by a high-speed area array camera. Combining template matching, and calculating to obtain the pixel coordinate position of the short arc bright area; and finally, solving a matrix relation between physical coordinate values and pixel coordinate values by means of a checkerboard calibration plate, and completing conversion of the pixel coordinates and the space physical coordinates of the short arc bright area.
S103, according to the contact line bottom profile curve picture, combining a gray level map, obtaining gray level values which account for more than 80% of the gray level map distribution, and obtaining an average gray level value Ave as a background gray level value;
s104, according to the pull-out value OffsetX of the contact line, performing window narrowing operation on the contact line bottom profile curve picture by using [ OffsetX-range X, offsetX+range X ].
In this embodiment, the range corresponds to the size of the view angle window required for accurately identifying the contact line profile; rangeX is provided for the purpose of focusing the view window onto a block area of the full picture.
S105, judging the left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom surface of the contact line.
In this embodiment, one of the methods is: according to a background gray value Ave obtained by calculating an area array camera picture, if gray values of pixel points with continuous 5 center point pixel coordinates of X1 are all kept at Ave, and pixel points with right 5 center point pixel coordinates of X2 are all higher than Ave, the center pixel point X2 is the left boundary of the outline of the bottom surface of the contact line; if the gray values of the pixel points with the coordinates of X1 of the continuous 5 center points are all kept at Ave, and the continuous pixel points with the coordinates of X3 of the left 5 center points are all higher than Ave, the center pixel point X3 is the right boundary of the outline of the bottom surface of the contact line;
if the gray value of the pixel point with the pixel coordinate of X1 of the continuous 5 center points is higher than Ave, and the gray value of the continuous point with the pixel coordinate of X2 of the right 5 center points is higher than the gray value of X1, and the deviation is larger than delta A, the center pixel point X2 is the left boundary of the outline of the bottom surface of the contact line; if the gray value of the pixel points with the continuous 5 central point pixel coordinates of X1 is higher than Ave, and the gray value of the continuous points with the left 5 central point pixel coordinates of X3 is higher than the gray value of X1 and the deviation is greater than delta A, the central pixel point X3 is the right boundary of the outline of the bottom surface of the contact line;
the brightness of the contact line abrasion area is high, the gray value is 255, and the delta A is 100 to 150, mainly aiming at showing that the abrasion area and the peripheral area have obvious gray value deviation.
S106, calculating the number of pixels occupied by the contact line in the picture through the left and right boundaries of the outline of the bottom surface of the contact line;
s107, calculating the corresponding actual abrasion value according to the number of pixels and storing.
Referring to fig. 2, a vehicle-mounted non-contact line abrasion measuring device includes:
an obtaining unit 201, configured to obtain a contact line bottom profile curve picture, where the contact line bottom profile curve is obtained by a high-definition area array camera with an 808nm optical filter added in front of a lens after being irradiated on a contact line by a line laser to form a contact line profile curve;
a first calculating unit 202, configured to obtain a pull-out value OffsetX of the contact line according to the position of the bright spot of the contact line in the profile image of the bottom of the contact line;
a second calculating unit 203, configured to calculate a gray value that accounts for more than 80% of the gray map distribution according to the contact line bottom contour curve picture in combination with the gray map, and calculate an average gray value Ave as a background gray value;
a first processing unit 204, configured to perform an operation of narrowing a window range on the contact line bottom profile image according to the pull-out value OffsetX of the contact line by [ OffsetX-range x, offsetx+range x ];
a judging unit 205, configured to judge left and right boundaries of the profile of the bottom surface of the contact line in the profile picture of the bottom surface of the contact line;
a third calculating unit 206, configured to calculate the number of pixels occupied by the contact line in the picture by the left and right boundaries of the outline of the bottom surface of the contact line;
the second processing unit 207 is configured to calculate and store the corresponding actual wear value according to the number of pixels.
Referring to fig. 3, a vehicle-mounted non-contact line abrasion measurement system includes a roof monitoring system 301 and an in-vehicle computing and processing system 302;
the roof monitoring system 301 comprises a laser imaging module 3011 and an image acquisition module 3012; the laser imaging module 3011 comprises a high power 808nm line laser generator mounted on the roof of the vehicle, the line laser generator being perpendicular to the line of contact; the image acquisition module 3012 comprises a high-speed linear array camera which is assembled on the roof and matched with the linear laser generator, and a camera lens with an optical filter is matched with the high-speed linear array camera;
the in-vehicle computing processing system 302 comprises an industrial personal computer module 3021 and a wireless transmission module 3022; the industrial personal computer module 3021 is a high-function industrial personal computer; the wireless transmission module 3022 is a 4G router and an antenna, and the high-function industrial personal computer is connected with the 4G router through an ethernet.
The roof monitoring system 301 is used for image acquisition and transmission; the in-vehicle computing processing system is used for processing, analyzing and calculating pictures acquired by the vehicle roof detection system and storing the values to upload the values to the cloud;
the laser imaging module 3011 is used for laser irradiation to present a contour curve of the bottom surface of a contact line on the contact line;
the image acquisition module 3012 is used for acquiring contour curve images of line laser irradiated on a contact line and shooting the contour curve images of the line laser irradiated from the rear side of the high-speed area array camera at the rear side of the laser;
the industrial personal computer module 3021 is configured to obtain a profile curve picture of the bottom of the contact line, where the profile curve of the bottom of the contact line is obtained by a high-definition area array camera with an optical filter of 808nm added in front of a lens after being irradiated on the contact line by a line laser to form a profile curve of the contact line; obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spot in the contact line bottom profile curve picture; according to the contact line bottom contour curve picture and the gray level picture, gray level values which account for more than 80% of the gray level picture distribution are obtained, and average gray level value Ave is obtained and used as background gray level value; according to the pull-out value OffsetX of the contact line, performing window range narrowing operation on the contact line bottom profile curve picture by using [ OffsetX-range X, offsetX+range X ]; judging left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom of the contact line; calculating the number of pixels occupied by the contact line in the picture through the left and right boundaries of the outline of the bottom surface of the contact line; calculating the corresponding actual abrasion value through the number of pixels and storing the actual abrasion value;
the wireless transmission module 3022 is configured to upload data to the cloud end through the router.
The invention provides a vehicle-mounted non-contact line abrasion measuring system, which has the following working principle: the train is electrified and started, equipment is electrified and operated, and the roof monitoring system 301 starts to work; the line laser generator 7 of the laser imaging module 3011 of the roof monitoring system 301 emits laser to form a contour line, the high-speed linear array camera 6 of the image acquisition module 3012 shoots a contour curve picture at the bottom of the contact line 5, and the shot picture is transmitted to the in-vehicle computing and processing system 302 through the Ethernet line 1; the in-vehicle high-function industrial personal computer 2 of the in-vehicle computing processing system 302 analyzes and processes the image; the image processing result is transmitted to the cloud database through the 4G router 3 of the wireless module 3022.
The embodiment of the invention also provides a storage medium, and a computer program is stored in the storage medium, and when the computer program is executed by a processor, part or all of the steps in each embodiment of the vehicle-mounted non-contact line abrasion measurement method are realized. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
It will be apparent to those skilled in the art that the techniques of embodiments of the present invention may be implemented in software plus a necessary general purpose hardware platform. Based on such understanding, the technical solutions in the embodiments of the present invention may be embodied in essence or what contributes to the prior art in the form of a software product, which may be stored in a storage medium, such as a ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the embodiments or some parts of the embodiments of the present invention.
The same or similar parts between the various embodiments in this specification are referred to each other. In particular, for an on-board non-contact line wear measuring device embodiment, since it is substantially similar to the method embodiment, the description is relatively simple, and reference is made to the description of the method embodiment for relevant points.
The embodiments of the present invention described above do not limit the scope of the present invention.
Claims (1)
1. The vehicle-mounted non-contact type contact line abrasion measuring method is characterized by comprising the following steps of:
acquiring a contact line bottom profile curve picture, wherein the contact line bottom profile curve is obtained by a high-definition area array camera with an 808nm optical filter arranged in front of a lens after being irradiated on a contact line through a line laser to form a contact line profile curve;
obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spot in the contact line bottom profile curve picture;
according to the contact line bottom contour curve picture and the gray level picture, gray level values which account for more than 80% of the gray level picture distribution are obtained, and average gray level value Ave is obtained and used as background gray level value;
according to the pull-out value OffsetX of the contact line, performing window range narrowing operation on the contact line bottom profile curve picture by using [ OffsetX-range X, offsetX+range X ];
judging left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom of the contact line;
calculating the number of pixels occupied by the contact line in the picture through the left and right boundaries of the outline of the bottom surface of the contact line;
calculating the corresponding actual abrasion value through the number of pixels and storing the actual abrasion value;
acquiring a contact line bottom profile curve picture, wherein in the step of acquiring the contact line bottom profile curve by a high-definition area array camera with an 808nm optical filter arranged in front of a lens after the contact line bottom profile curve is formed on a contact line through irradiation of a line laser, 808nm invisible light is selected;
obtaining a pull-out value OffsetX of the contact line according to the position of the contact line bright spot in the contact line bottom profile curve picture, wherein the pull-out value OffsetX comprises the following steps:
firstly, irradiating a line laser on a contact line to form a short arc bright area;
then, capturing and shooting the presented short arc bright area picture of the contact line by a high-speed area array camera, and calculating to obtain the pixel coordinate position of the short arc bright area by combining template matching;
finally, a matrix relation between physical coordinate values and pixel coordinate values is obtained by means of a checkerboard calibration plate, and conversion of pixel coordinates and space physical coordinates of a short arc bright area is completed;
according to the pull-out value OffsetX of the contact line, in the step of reducing the window range of the profile curve picture at the bottom of the contact line by using [ OffsetX-range X, offsetX+range ], the range corresponds to the size of a view angle window required for accurately identifying the profile of the contact line; the purpose of setting RangeX is to concentrate the view window to a certain block area of the full picture;
judging the left and right boundaries of the profile of the bottom surface of the contact line in the profile curve picture of the bottom of the contact line comprises the following steps:
one of the methods is as follows: according to a background gray value Ave obtained by calculating an area array camera picture, if gray values of pixel points with continuous 5 center point pixel coordinates of X1 are all kept at Ave, and pixel points with right 5 center point pixel coordinates of X2 are all higher than Ave, the center pixel point X2 is the left boundary of the outline of the bottom surface of the contact line; if the gray values of the pixel points with the coordinates of X1 of the continuous 5 center points are all kept at Ave, and the continuous pixel points with the coordinates of X3 of the left 5 center points are all higher than Ave, the center pixel point X3 is the right boundary of the outline of the bottom surface of the contact line;
if the gray value of the pixel point with the pixel coordinate of X1 of the continuous 5 center points is higher than Ave, and the gray value of the continuous point with the pixel coordinate of X2 of the right 5 center points is higher than the gray value of X1, and the deviation is larger than delta A, the center pixel point X2 is the left boundary of the outline of the bottom surface of the contact line; if the gray value of the pixel points with the continuous 5 central point pixel coordinates of X1 is higher than Ave, and the gray value of the continuous points with the left 5 central point pixel coordinates of X3 is higher than the gray value of X1 and the deviation is greater than delta A, the central pixel point X3 is the right boundary of the outline of the bottom surface of the contact line;
the brightness of the contact line abrasion area is high, the gray value is 255, and the delta A is set to be 100-150.
Priority Applications (1)
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