CN105893943A - Oil level detection method and system - Google Patents
Oil level detection method and system Download PDFInfo
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- CN105893943A CN105893943A CN201610187567.3A CN201610187567A CN105893943A CN 105893943 A CN105893943 A CN 105893943A CN 201610187567 A CN201610187567 A CN 201610187567A CN 105893943 A CN105893943 A CN 105893943A
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- oil level
- response
- level gauge
- dial plate
- straight line
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/50—Context or environment of the image
- G06V20/52—Surveillance or monitoring of activities, e.g. for recognising suspicious objects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F23/00—Indicating or measuring liquid level or level of fluent solid material, e.g. indicating in terms of volume or indicating by means of an alarm
Abstract
The invention discloses an oil level detection method and system. The method includes the steps of conducting Haar response calculation for a dial image of an oil gauge according to the geometric characteristics of a pointer line of the oil gauge and the dial gray scale information distribution characteristics of the oil gauge to obtain a Haar response chart. Since a pointer line area has higher Haar response values than a non-pointer line area, the Haar response value distribution is calculated through a histogram, and partial maximum value points in the Haar response chart are sorted out by setting the Haar response values corresponding to quantiles that meet preset requirements as thresholds. A line with maximal total of Haar response values serves as a pointer line in the dial image of the oil gauge through a straight line fitting method. The scale value that the pointer line is pointed at on the dial image of the oil gauge is obtained according to the parameter information of the pointer line and the marked scaled points on the dial image of the oil gauge. Manual work is not required, and safety risk is reduced.
Description
Technical field
The present invention relates to oil level gauge technical field, in particular, relate to a kind of oil level detection method and be
System.
Background technology
Oil level gauge is a kind of instrument how many for the oil mass showing in target fuel tank, by described oil level
The monitoring of the current reading of table can understand the fluid amount in target fuel tank in time, thus prevents because of in target fuel tank
Oil mass very few and cause equipment to be burned out or problem out of service.Therefore, oil level gauge is carried out daily
Patrolling and examining is one of very important project in the artificial O&M of transformer station.
At present, mainly by the way of manual inspection, the instruction state of oil level gauge pointer is detected.But
Patrol and examine dangerous being existed by manual inspection and patrol and examine the problems such as efficiency is low.Therefore, how one is provided
Planting oil level detection method and system and complete patrol task, to liberate manpower, reduction potential safety hazard is ability
The technical problem that field technique personnel are urgently to be resolved hurrily.
Summary of the invention
In view of this, the open a kind of oil level detection method and system of the present invention, to realize appointing completing to patrol and examine
While business, liberate manpower, reduce potential safety hazard.
A kind of oil level detection method, including:
Obtain oil level gauge image, according to the gradient angle descriptor information of oil level gauge dial plate, to described oil level
Table image carries out template-matching operation, obtains oil level gauge dial plate image；
Described oil level gauge dial plate image is carried out Ha Er RESPONSE CALCULATION and obtains the Ha Er sound of oil level gauge dial plate image
Ying Tu；
Each Ha Er response value in described Ha Er response diagram is carried out histogram information statistics, finds height
The Ha Er response value quantity of numerical value accounts for point position that percentage ratio is preset percentage of Ha Er response value total quantity
Point, using Ha Er response value corresponding for described quantile as threshold value；
Obtain each Local modulus maxima in described Ha Er response diagram；
Line fitting method is used to obtain each initial straight, according to described each described Local modulus maxima
Each described initial straight is fitted revising by threshold value, obtains one group of straight line, by pixel in each described straight line
The straight line of the Ha Er response value sum maximum of point is as the cursor line in oil level gauge dial plate image；
Choose two points that position in described cursor line is different, be the first labelling point and the second labelling respectively
Point；
Obtain on straight line that is that be perpendicular to described cursor line and that pass described first labelling point and Ha Er response
Value, more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N1；
Obtain on straight line that is that be perpendicular to described cursor line and that pass described second labelling point and Ha Er response
Value, more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N2；
Judge the size of described N1 and N2, when described N1 is more than N2, described first labelling point is made
For the start position of pointer, using described second labelling point as the final position of pointer, when described N1 is less than
During N2, using described first labelling point as the final position of pointer, using described second labelling point as pointer
Start position；
According to described start position and described final position, it is calculated slope and the intercept of described cursor line；
According to the training stage in advance in the calibration points of oil level gauge dial plate image tagged, and described start position,
Described final position, described slope and described intercept, be calculated described cursor line at oil level gauge dial plate figure
The scale value pointed in Xiang.
Preferably, described described oil level gauge dial plate image is carried out Ha Er RESPONSE CALCULATION obtain oil level gauge dial plate
The Ha Er response diagram of image, including:
The color of described oil level gauge dial plate image is converted to YCbCr color space from RGB color；
Utilize red color component value and luminance component to carry out Difference Calculation, obtain the colour-difference component of correspondence；
Described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response of oil level gauge dial plate image
Figure.
Preferably, described described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtain oil level gauge dial plate figure
The process of the Ha Er response diagram of picture includes:
With predetermined angle as step-length, described colour-difference component is rotated, and to each anglec of rotation
Colour-difference partial image once travels through, and is calculated the Ha Er response value of each pixel；
Choose each described pixel maximum Ha Er response value under different rotary angle successively, and will
The Ha Er response value of described maximum is as the final Ha Er response value of this pixel；
The final Ha Er response value of each described pixel is combined, forms the Kazakhstan of oil level gauge dial plate image
That response diagram.
Preferably, the process of each Local modulus maxima in described acquisition described Ha Er response diagram includes:
Travel through described Ha Er response diagram, search the Ha Er response value pixel more than described threshold value；
Successively in the local neighborhood of each described pixel, it is judged that the Ha Er response value that this pixel is corresponding
Whether it is Local modulus maxima；
If it is, pixel and Local modulus maxima are stored with the form of corresponding relation.
Preferably, described each described Local modulus maxima used line fitting method to obtain each the most straight
Line, is fitted revising to each described initial straight according to described threshold value, obtains one group of straight line, Jiang Gesuo
State the straight line of Ha Er response value sum maximum of pixel in straight line as the pointer in oil level gauge dial plate image
The process of line includes:
Use stochastic sampling unification algorism, from all Local modulus maximas, the most optionally two of which office
Portion's maximum point carries out fitting a straight line, obtains initial straight；
Utilize the remaining distance to the described initial straight Local modulus maxima less than described threshold value, to institute
State initial straight to be fitted revising, obtain candidate's straight line；
After described Local modulus maxima traversal is terminated, by all candidate's straight line set, comprised many
One group of straight line of bar candidate's straight line；
Calculate the Ha Er response value sum of pixel on every described straight line successively, and described Ha Er is responded
Value sum is as the confidence level of this straight line, and using straight line the highest for confidence level as in oil level gauge dial plate image
Cursor line.
A kind of oil level detection system, including:
Dial plate image acquisition unit, is used for obtaining oil level gauge image, according to the gradient angle of oil level gauge dial plate
Descriptor information, carries out template-matching operation to described oil level gauge image, obtains oil level gauge dial plate image；
Ha Er response unit, carries out Ha Er RESPONSE CALCULATION for described oil level gauge dial plate image, obtains oil level
The Ha Er response diagram of table dial plate image；
Statistic unit, for carrying out histogram information to each Ha Er response value in described Ha Er response diagram
Statistics, it is default for finding the Ha Er response value quantity of high numerical value and accounting for the percentage ratio of Ha Er response value total quantity
The quantile of percentage ratio, using Ha Er response value corresponding for described quantile as threshold value；
Local modulus maxima acquiring unit, for obtaining each local maximum in described Ha Er response diagram
Point；
Cursor line acquiring unit, for using line fitting method to obtain respectively each described Local modulus maxima
Individual initial straight, is fitted revising to each described initial straight according to described threshold value, obtains one group of straight line,
Using straight line maximum for the Ha Er response value sum of pixel in each described straight line as in oil level gauge dial plate image
Cursor line；
Pointer position acquiring unit, for choosing two points that position in described cursor line is different, be respectively
It is the first labelling point and the second labelling point；Obtain be perpendicular to described cursor line and through described first labelling
On the straight line selected and Ha Er response value is more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N1；Obtain
Take be perpendicular to described cursor line and through described second labelling point straight line on and Ha Er response value be more than
The number of the continuous image vegetarian refreshments of described threshold value, is designated as N2；Judge the size of described N1 and N2, work as institute
When stating N1 more than N2, using described first labelling point as the start position of pointer, by described second labelling
Point is as the final position of pointer, when described N1 is less than N2, using described first labelling point as pointer
Final position, using described second labelling point as the start position of pointer；
First computing unit, for according to described start position and described final position, is calculated described
The slope of cursor line and intercept；
Second computing unit, is used for according to the training stage in advance in the calibration points of oil level gauge dial plate image tagged,
And described start position, described final position, described slope and described intercept, it is calculated described finger
The scale value that needlework point in oil level gauge dial plate image.
Preferably, in above-mentioned oil level detection system, described Ha Er response unit, including:
Color conversion subelement, for turning the color of described oil level gauge dial plate image from RGB color
It is changed to YCbCr color space；
Difference diagram converting unit, is used for utilizing red color component value and luminance component to carry out Difference Calculation, obtains
Corresponding colour-difference component；
Sub-response unit, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains oil level gauge table
The Ha Er response diagram of dish image.
Preferably, in above-mentioned oil level detection system, described sub-response unit includes:
Ha Er response value computing unit, for predetermined angle as step-length, is carried out described colour-difference component
Rotate, and the colour-difference partial image of each anglec of rotation is once traveled through, be calculated each pixel
The Ha Er response value of point；
Choose subelement, for choosing each described pixel maximum under different rotary angle successively
Ha Er response value, and using the Ha Er response value of described maximum as the final Ha Er response value of this pixel；
Combination subelement, for the final Ha Er response value of each described pixel being combined, forms oil
The Ha Er response diagram of position table dial plate image.
Preferably, in above-mentioned oil level detection system, described Local modulus maxima acquiring unit includes:
Search subelement, be used for traveling through described Ha Er response diagram, search Ha Er response value more than described threshold value
Pixel；
Judgment sub-unit, for successively in the local neighborhood of each described pixel, it is judged that this pixel
Whether corresponding Ha Er response value is Local modulus maxima, if it is, perform storing sub-units；
Described storing sub-units, for carrying out pixel and Local modulus maxima with the form of corresponding relation
Storage.
Preferably, in above-mentioned oil level detection system, described cursor line acquiring unit includes:
Fitting a straight line subelement, is used for using stochastic sampling unification algorism, from all Local modulus maximas,
The most optionally two of which Local modulus maxima carries out fitting a straight line, obtains initial straight；
Revise subelement, for utilizing the remaining distance to the described initial straight office less than described threshold value
Portion's maximum point, is fitted described initial straight revising, obtains candidate's straight line；
Set subelement, for after terminating described Local modulus maxima traversal, by all candidate's straight lines
Set, obtains comprising one group of straight line of a plurality of candidate's straight line；
Cursor line obtains subelement, for calculating the Ha Er response value of pixel on every described straight line successively
Sum, and using described Ha Er response value sum as the confidence level of this straight line, and by the highest for confidence level straight
Line is as the cursor line in oil level gauge dial plate image.
From above-mentioned technical scheme it can be seen that the invention discloses a kind of oil level detection method and system,
The geometric properties of the cursor line according to oil level gauge and oil level gauge dial plate half-tone information characteristic distributions, to oil level gauge
Dial plate image carries out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of correspondence, owing to cursor line region is relative
Have higher Ha Er response value in non-pointer region, therefore, the present invention passes through rectangular histogram to Ha Er response value
Distribution add up, and using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value,
Filter out the Local modulus maxima in Ha Er response diagram.Owing to the set of Local modulus maxima including finger
On needlework, some are as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, Jiang Haer
The straight line of response value sum maximum is as the cursor line in oil level gauge dial plate image, finally according to cursor line
Start position, final position, slope, intercept and training stage are in advance in oil level gauge dial plate image tagged
Calibration points, obtain the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that this
Bright compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, has therefore reached to patrol completing
While inspection task, liberate manpower, reduce the purpose of potential safety hazard.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only embodiments of the invention, for those of ordinary skill in the art, not
On the premise of paying creative work, it is also possible to obtain other accompanying drawing according to disclosed accompanying drawing.
Fig. 1 is a kind of oil level detection method flow diagram disclosed in the embodiment of the present invention；
Fig. 2 is the structural representation of a kind of oil level detection system disclosed in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention, and
It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The embodiment of the invention discloses a kind of oil level detection method and system, to realize completing patrol task
While, liberate manpower, reduce potential safety hazard.
The basic scheme of the present invention is: indicate state-detection demand based on oil level gauge, it is first determined oil level gauge
Position in the oil level gauge image obtained；Then after oil level gauge object determines, at oil level gauge dial plate model
Enclose interior searching cursor line position；Finally according to dial reading rule, calculate oil level gauge currently indicates state.
Concrete scheme is as follows:
See Fig. 1, a kind of oil level detection method flow diagram disclosed in the embodiment of the present invention, including step:
Step S10, target oil level gauge is carried out image acquisition, using the image that collects as oil level gauge figure
Picture；
Step S11, gradient angle descriptor information according to oil level gauge dial plate, enter described oil level gauge image
Row template-matching operation, obtains oil level gauge dial plate image；
Wherein, oil level gauge image uses video camera to obtain.
Gradient angle descriptor is a kind of feature describing image detail, obtains in the training stage.
The acquisition process of gradient angle descriptor is specific as follows:
(1) utilize video camera to obtain the training image of oil level gauge, and obtain from this training image and only comprise
The dial plate subject area of oil level gauge dial plate；
(2) application one piece and training image memory headroom of the same size, be used for depositing according to training image
The template image (i.e. Mask figure) obtained, this template image is a black and white binary image, white portion
Representing dial plate subject area, black region represents other background areas beyond dial plate subject area；
(3) for dial plate subject area, press from left to right, then order from top to bottom, calculate every successively
The Grad of individual pixel and angle value, thus obtain the gradient angle descriptor information of oil level gauge dial plate,
And preserve to internal memory.
Step S12, described oil level gauge dial plate image is carried out Ha Er RESPONSE CALCULATION obtain oil level gauge dial plate image
Ha Er response diagram；
It should be noted that the Lis Hartel in Ha Er response diagram levies (haar) by Ha Er template filled black district
Pixel value sum sum (black) that territory is covered fills, with white, pixel value sum sum (in vain) that region is covered
Difference represent:
Sum (black)-sum (in vain) or sum (in vain)-sum (black).
Step S13, according to described Ha Er response diagram obtain threshold value；
Concrete, each Ha Er response value in described Ha Er response diagram is carried out histogram information statistics,
Finding the Ha Er response value quantity of high numerical value and accounting for the percentage ratio of Ha Er response value total quantity is preset percentage
Quantile, using Ha Er response value corresponding for described quantile as threshold value；
Wherein, depending on the concrete foundation of the numerical value of preset percentage is actually needed, such as 75%, the present invention is at this
Do not limit.
Step S14, each Local modulus maxima obtained in described Ha Er response diagram；
It should be noted that step S13 and step S14 are in practical implementation, unfixing the most suitable
Sequence, can first carry out step S13, rear execution step S14, or first carries out step S14, performs step afterwards
S13, or two steps perform simultaneously.
Step S15, obtain the cursor line in oil level gauge dial plate image according to Local modulus maxima and threshold value；
Concrete, use line fitting method to obtain each initial straight each described Local modulus maxima,
Be fitted each described initial straight revising according to described threshold value, obtain one group of straight line, by each described directly
The straight line that in line, the Ha Er response value sum of pixel is maximum is as the cursor line in oil level gauge dial plate image.
Step S16, the start position obtaining cursor line and final position；
Concrete, obtain and be perpendicular to the continuous print of described cursor line and Ha Er response value more than described threshold value
The number of pixel, using the position of the cursor line with most pixel as the start position of pointer, will
There is the final position as pointer, the position of minimum pixel；Or in the described cursor line of random intercepting
Two different location points, are designated as the first labelling point and the second labelling point, obtain and are perpendicular to described cursor line
And through on the straight line of described first labelling point and Ha Er response value more than the contiguous pixels of described threshold value
The number of point, is designated as N1；Obtain straight line that is that be perpendicular to described cursor line and that pass described second labelling point
On and Ha Er response value more than the number of continuous image vegetarian refreshments of described threshold value, be designated as N2；Judge described
The size of N1 and N2, when described N1 is more than N2, using described first labelling point as the starting point of pointer
Position, using described second labelling point as the final position of pointer, when described N1 is less than N2, by institute
State the first labelling point final position as pointer, using described second labelling point as the start position of pointer.
Step S17, according to described start position and described final position, be calculated the oblique of described cursor line
Rate and intercept；
Step S18, according to the training stage in advance in the calibration points of oil level gauge dial plate image tagged, and pointer
The parameter information of line, is calculated the scale value that described cursor line is pointed in oil level gauge dial plate image.
The parameter information of cursor line includes: start position, final position, slope and intercept.
Wherein, the training stage in the process of oil level gauge dial plate image tagged calibration points is: in the instruction of oil level gauge
Practice the calibration points in labelling dial plate on image, and the position of each calibration points is carried out record, then, according to
The calibration points of labelling, is manually entered the scale value of correspondence, and preserves.
In summary it can be seen, the present invention is grey according to geometric properties and the oil level gauge dial plate of the cursor line of oil level gauge
Degree information distribution feature, carries out Ha Er RESPONSE CALCULATION to oil level gauge dial plate image, and the Ha Er obtaining correspondence rings
Ying Tu, preliminary filter background disturbs；Owing to there is higher Ha Er in cursor line region relative to non-pointer region
Response value, therefore, the distribution of Ha Er response value is added up by the present invention by rectangular histogram, and will meet
Ha Er response value corresponding to the quantile of preset requirement, as threshold value, filters out the local in Ha Er response diagram
Maximum point, further filter background disturbs；Owing to the set of Local modulus maxima including cursor line
Above some are as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, are responded by Ha Er
The straight line of value sum maximum is as the cursor line in oil level gauge dial plate image, finally according to the starting point of cursor line
Position, final position, slope, intercept and training stage are in advance at the quarter of oil level gauge dial plate image tagged
Degree point, obtains the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that phase of the present invention
For prior art, it is not necessary to patrol officer goes collection in worksite data, therefore reach to appoint completing to patrol and examine
While business, liberate manpower, reduce the purpose of potential safety hazard.
If during of course, it should be understood that oil level is too low or can not supplement fluid in time, may affect
The normal use of equipment, therefore, when oil level is too low, in order to make prompting, institute in time to user
After stating step S18, it is also possible to including: judge the scale that described cursor line is pointed in oil level gauge dial plate
Whether value is more than preset value, if it does not, outputting alarm signal.
For optimizing above-described embodiment further, step S12 specifically includes:
Step S121, by the color of oil level gauge dial plate image from RGB (RGB) color space conversion it is
YCbCr color space；
Wherein, YCbCr sometimes can be written as: YCBCR or Y'CBCR, is the one of color space
Kind, it will usually the image continuous processing in film, or in digital photographic systems.Y' is the bright of color
Degree (luma) composition CB and CR is then blue and red concentration excursion amount composition.Y' and Y is not
With, and Y is exactly so-called lumen, represents the concentration of light and be non-linear, use gamma-corrected (gamma
Correction) coded treatment.
Step S122, utilize red color component value and luminance component to carry out Difference Calculation, obtain the color of correspondence
Difference diagram；
Step S123, described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtain oil level gauge dial plate image
Ha Er response diagram.
For optimizing above-described embodiment further, step S123 specifically includes:
Step S1231, with predetermined angle as step-length, described colour-difference component is rotated, and to each
The colour-difference partial image of the anglec of rotation once travels through, and is calculated the Ha Er response value of each pixel；
Depending on the concrete foundation of the numerical value of described predetermined angle is actually needed, such as 10 °.
It should be noted that the oil level gauge pointer of actual substation field may point to arbitrarily angled, in order to
Can allow cursor line and Ha Er template matching, with predetermined angle as step-length, described colour-difference component can be entered
Row rotates, and once travels through the colour-difference partial image of each anglec of rotation, is calculated each picture
The Ha Er response value of vegetarian refreshments.
Step S1232, choose each described pixel maximum Ha Er under different rotary angle successively and ring
Should be worth, and using the Ha Er response value of described maximum as the final Ha Er response value of this pixel；
Step S1233, the final Ha Er response value of each described pixel is combined, forms oil level gauge table
The Ha Er response diagram of dish image.
For optimizing above-described embodiment further, step S14 specifically includes:
Step S141, traversal Ha Er response diagram, search the Ha Er response value pixel more than threshold value；
Step S142, successively in the local neighborhood of each described pixel, it is judged that this pixel is corresponding
Whether Ha Er response value is Local modulus maxima, if it is, perform step S143；
Step S143, pixel and Local modulus maxima are stored with the form of corresponding relation.
It should be noted that when the Ha Er response value that pixel is corresponding is not Local modulus maxima, then arrange
Except this pixel.
For optimizing above-described embodiment further, step S15 specifically includes:
Step S151, employing stochastic sampling unification algorism, from all Local modulus maximas, the most optionally
Two of which Local modulus maxima carries out fitting a straight line, obtains initial straight；
Wherein, stochastic sampling unification algorism (RANdom Sample Consensus, RANSAC) is one
Plant according to one group of sample data set comprising abnormal data, calculate the mathematical model parameter of data, obtain
The algorithm of effective sample data.
The basic assumption of RANSAC algorithm is to comprise just data in sample (inliers can be described by model
Data), also comprise abnormal data (outliers, deviation normal range is far, cannot adapt to mathematical model
Data), i.e. containing noise in data set.These abnormal datas are likely due to the measurement of mistake, mistake
Assume, the calculating etc. of mistake produces.RANSAC also assumes that simultaneously, given one group of correct data,
Existence can calculate the method for the model parameter meeting these data.
Step S152, utilize the remaining distance to described initial straight less than the local maximum of described threshold value
Value point, is fitted described initial straight revising, obtains candidate's straight line；
Wherein, by judging that the Local modulus maxima distance to initial straight, whether less than threshold value, judges
Whether this Local modulus maxima is in initial straight.
Step S153, to described Local modulus maxima traversal terminate after, by all candidate's straight line set,
Obtain comprising one group of straight line of a plurality of candidate's straight line；
Step S154, calculate the Ha Er response value sum of pixel on every described straight line successively, and by institute
State the Ha Er response value sum confidence level as this straight line, and using straight line the highest for confidence level as oil level gauge
Cursor line in dial plate image.
In summary it can be seen, the present invention is grey according to geometric properties and the oil level gauge dial plate of the cursor line of oil level gauge
Degree information distribution feature, carries out Ha Er RESPONSE CALCULATION to the oil level gauge dial plate after carrying out color space conversion,
Obtaining the Ha Er response diagram of correspondence, preliminary filter background disturbs；Owing to cursor line region is relative to non-pointer
There is higher Ha Er response value in region, and therefore, the distribution of Ha Er response value is entered by the present invention by rectangular histogram
Row statistics, and using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filter out Kazakhstan
Local modulus maxima in your response diagram, further filter background disturbs；Collection due to Local modulus maxima
Including in conjunction in cursor line that some are as the point of fitting a straight line, therefore, the present invention is by fitting a straight line
Method, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally
Start position, final position, slope, intercept and training stage according to cursor line are in advance at oil level gauge
The calibration points of dial plate image tagged, obtains the scale value that cursor line is pointed in oil level gauge dial plate image.Can
To find out, the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, therefore reaches
To while completing patrol task, liberate manpower, reduce the purpose of potential safety hazard.
Corresponding with said method embodiment, the invention also discloses a kind of oil level detection system.
See Fig. 2, the structural representation of a kind of oil level detection system disclosed in the embodiment of the present invention, including:
Dial plate image acquisition unit 21, is used for obtaining oil level gauge image, according to the gradient angle of oil level gauge dial plate
Degree descriptor information, carries out template-matching operation to described oil level gauge image, obtains oil level gauge dial plate image；
Wherein, oil level gauge image uses video camera to obtain.
Gradient angle descriptor is a kind of feature describing image detail, obtains in the training stage.
The acquisition process of gradient angle descriptor is specific as follows:
(1) utilize video camera to obtain the training image of oil level gauge, and obtain from this training image and only comprise
The dial plate subject area of oil level gauge dial plate；
(2) application one piece and training image memory headroom of the same size, be used for depositing according to training image
The template image (i.e. Mask figure) obtained, this template image is a black and white binary image, white portion
Representing dial plate subject area, black region represents other background areas beyond dial plate subject area；
(3) for dial plate subject area, press from left to right, then order from top to bottom, calculate every successively
The Grad of individual pixel and angle value, thus obtain the gradient angle descriptor information of oil level gauge dial plate,
And preserve to internal memory.
Ha Er response unit 22, carries out Ha Er RESPONSE CALCULATION for described oil level gauge dial plate image, obtains oil
The Ha Er response diagram of position table dial plate image；
It should be noted that the Lis Hartel in Ha Er response diagram levies (haar) by Ha Er template filled black district
Pixel value sum sum (black) that territory is covered fills, with white, pixel value sum sum (in vain) that region is covered
Difference represent:
Sum (black)-sum (in vain) or sum (in vain)-sum (black).
Statistic unit 23, for carrying out rectangular histogram letter to each Ha Er response value in described Ha Er response diagram
Breath statistics, it is pre-for finding the Ha Er response value quantity of high numerical value and accounting for the percentage ratio of Ha Er response value total quantity
If the quantile of percentage ratio, using Ha Er response value corresponding for described quantile as threshold value；
Wherein, depending on the concrete foundation of the numerical value of preset percentage is actually needed, such as 75%, the present invention is at this
Do not limit.
Local modulus maxima acquiring unit 24, for obtaining each local maximum in described Ha Er response diagram
Value point；
Cursor line acquiring unit 25, for using line fitting method to obtain each described Local modulus maxima
Each initial straight, is fitted each described initial straight revising according to described threshold value, obtain one group straight
Line, using straight line maximum for the Ha Er response value sum of pixel in each described straight line as oil level gauge dial plate figure
Cursor line in Xiang；
Pointer position acquiring unit 26, for choosing two points that position in described cursor line is different,
It is the first labelling point and the second labelling point respectively；Obtain be perpendicular to described cursor line and through described the
On the straight line that one labelling is selected and Ha Er response value is more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as
N1；Obtain on straight line that is that be perpendicular to described cursor line and that pass described second labelling point and Ha Er response
Value, more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N2；Judge the size of described N1 and N2,
When described N1 is more than N2, using described first labelling point as the start position of pointer, by described second
Labelling point is as the final position of pointer, when described N1 is less than N2, using described first labelling point as
The final position of pointer, using described second labelling point as the start position of pointer, or pointer position obtains
Take unit 26 for obtaining the continuous print being perpendicular to described cursor line and Ha Er response value more than described threshold value
The number of pixel, using there is most pixel position as the start position of pointer, will have minimum
The position of pixel is as the final position of pointer；
First computing unit 27, for according to described start position and described final position, is calculated institute
State slope and the intercept of cursor line；
Second computing unit 28, is used for according to the training stage in advance at the scale of oil level gauge dial plate image tagged
Point, and described start position, described final position, described slope and described intercept, be calculated institute
State the scale value that cursor line is pointed in oil level gauge dial plate image.
Wherein, the training stage in the process of oil level gauge dial plate image tagged calibration points is: in the instruction of oil level gauge
Practice the calibration points in labelling dial plate on image, and the position of each calibration points is carried out record, then, according to
The calibration points of labelling, is manually entered the scale value of correspondence, and preserves.
In summary it can be seen, the present invention is grey according to geometric properties and the oil level gauge dial plate of the cursor line of oil level gauge
Degree information distribution feature, carries out Ha Er RESPONSE CALCULATION to the oil level gauge dial plate after carrying out color space conversion,
Obtaining the Ha Er response diagram of correspondence, preliminary filter background disturbs；Owing to cursor line region is relative to non-pointer
There is higher Ha Er response value in region, and therefore, the distribution of Ha Er response value is entered by the present invention by rectangular histogram
Row statistics, and using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filter out Kazakhstan
Local modulus maxima in your response diagram, further filter background disturbs；Collection due to Local modulus maxima
Including in conjunction in cursor line that some are as the point of fitting a straight line, therefore, the present invention is by fitting a straight line
Method, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally
Start position, final position, slope, intercept and training stage according to cursor line are in advance at oil level gauge
The calibration points of dial plate image tagged, obtains the scale value that cursor line is pointed in oil level gauge dial plate image.Can
To find out, the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, therefore reaches
To while completing patrol task, liberate manpower, reduce the purpose of potential safety hazard.
For optimizing above-described embodiment further, Ha Er response unit 22 includes:
Color conversion subelement 221, for empty from RGB color by the color of described oil level gauge dial plate image
Between be converted to YCbCr color space；
First computation subunit 222, is used for utilizing red color component value and luminance component to carry out Difference Calculation,
To corresponding colour-difference component；
Sub-response unit 223, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains oil level gauge
The Ha Er response diagram of dial plate image..
For optimizing above-described embodiment further, sub-response unit 223 includes:
Second computation subunit 2231, for predetermined angle as step-length, is carried out described colour-difference component
Rotate, and the colour-difference partial image of each anglec of rotation is once traveled through, be calculated each pixel
The Ha Er response value of point；
Depending on the concrete foundation of the numerical value of predetermined angle is actually needed, such as 10 °.
It should be noted that the oil level gauge pointer of actual substation field may point to arbitrarily angled, in order to
Can allow cursor line and Ha Er template matching, with predetermined angle as step-length, described colour-difference component can be entered
Row rotates, and once travels through the colour-difference partial image of each anglec of rotation, is calculated each picture
The Ha Er response value of vegetarian refreshments.
Choose subelement 2232, for choosing each described pixel successively under different rotary angle
Big Ha Er response value, and the Ha Er response value of described maximum is responded as the final Ha Er of this pixel
Value；
Combination subelement 2233, for the final Ha Er response value of each described pixel is combined, shape
Become the Ha Er response diagram of oil level gauge dial plate image.
For optimizing above-described embodiment further, Local modulus maxima acquiring unit 24 includes:
Search subelement 241, be used for traveling through described Ha Er response diagram, search Ha Er response value more than described threshold
The pixel of value；
Judgment sub-unit 242, for successively in the local neighborhood of each described pixel, it is judged that this pixel
Whether the Ha Er response value that point is corresponding is Local modulus maxima, if it is, perform storing sub-units 243；
Storing sub-units 243, for depositing pixel and Local modulus maxima with the form of corresponding relation
Storage.
It should be noted that when the Ha Er response value that pixel is corresponding is not Local modulus maxima, then arrange
Except this pixel.
For optimizing above-described embodiment further, cursor line acquiring unit 25 includes:
Fitting a straight line subelement 251, is used for using stochastic sampling unification algorism, from all Local modulus maximas
In, the most optionally two of which Local modulus maxima carries out fitting a straight line, obtains initial straight；
Wherein, stochastic sampling unification algorism (RANdom Sample Consensus, RANSAC) is one
Plant according to one group of sample data set comprising abnormal data, calculate the mathematical model parameter of data, obtain
The algorithm of effective sample data.
The basic assumption of RANSAC algorithm is to comprise just data in sample (inliers can be described by model
Data), also comprise abnormal data (outliers, deviation normal range is far, cannot adapt to mathematical model
Data), i.e. containing noise in data set.These abnormal datas are likely due to the measurement of mistake, mistake
Assume, the calculating etc. of mistake produces.RANSAC also assumes that simultaneously, given one group of correct data,
Existence can calculate the method for the model parameter meeting these data.
Revise subelement 252, for utilizing the remaining distance to described initial straight less than described threshold value
Local modulus maxima, is fitted described initial straight revising, obtains candidate's straight line；
Wherein, by judging that the Local modulus maxima distance to initial straight, whether less than threshold value, judges
Whether this Local modulus maxima is in initial straight.
Set subelement 253, for after terminating described Local modulus maxima traversal, by straight for all candidates
Line set, obtains comprising one group of straight line of a plurality of candidate's straight line；
Cursor line obtains subelement 254, for calculating the Ha Er response of pixel on every described straight line successively
Value sum, and using described Ha Er response value sum as the confidence level of this straight line and confidence level is the highest
Straight line is as the cursor line in oil level gauge dial plate image.
In summary it can be seen, the present invention is grey according to geometric properties and the oil level gauge dial plate of the cursor line of oil level gauge
Degree information distribution feature, carries out Ha Er RESPONSE CALCULATION to the oil level gauge dial plate after carrying out color space conversion,
Obtaining the Ha Er response diagram of correspondence, preliminary filter background disturbs；Owing to cursor line region is relative to non-pointer
There is higher Ha Er response value in region, and therefore, the distribution of Ha Er response value is entered by the present invention by rectangular histogram
Row statistics, and using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filter out Kazakhstan
Local modulus maxima in your response diagram, further filter background disturbs；Collection due to Local modulus maxima
Including in conjunction in cursor line that some are as the point of fitting a straight line, therefore, the present invention is by fitting a straight line
Method, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally
Start position, final position, slope, intercept and training stage according to cursor line are in advance at oil level gauge
The calibration points of dial plate image tagged, obtains the scale value that cursor line is pointed in oil level gauge dial plate image.Can
To find out, the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, therefore reaches
To while completing patrol task, liberate manpower, reduce the purpose of potential safety hazard.
It should be noted that in system embodiment, the specific works principle of each ingredient refers to method
Embodiment corresponding part, here is omitted.
Finally, in addition it is also necessary to explanation, in this article, the relational terms of such as first and second or the like
It is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires
Or imply relation or the order that there is any this reality between these entities or operation.And, art
Language " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, thus
Make to include that the process of a series of key element, method, article or equipment not only include those key elements, and
Also include other key elements being not expressly set out, or also include for this process, method, article or
The key element that person's equipment is intrinsic.In the case of there is no more restriction, by statement " including ... "
The key element limited, it is not excluded that also deposit in including the process of described key element, method, article or equipment
In other identical element.
In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being the difference with other embodiments, between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. an oil level detection method, it is characterised in that including:
Target oil level gauge is carried out image acquisition, using the image that collects as oil level gauge image；
Gradient angle descriptor information according to oil level gauge dial plate, carries out template to described oil level gauge image
Join operation, obtain oil level gauge dial plate image；
Described oil level gauge dial plate image is carried out Ha Er RESPONSE CALCULATION and obtains the Ha Er sound of oil level gauge dial plate image
Ying Tu；
Each Ha Er response value in described Ha Er response diagram is carried out histogram information statistics, finds height
The Ha Er response value quantity of numerical value accounts for point position that percentage ratio is preset percentage of Ha Er response value total quantity
Point, using Ha Er response value corresponding for described quantile as threshold value；
Obtain each Local modulus maxima in described Ha Er response diagram；
Line fitting method is used to obtain each initial straight, according to described each described Local modulus maxima
Each described initial straight is fitted revising by threshold value, obtains one group of straight line, by pixel in each described straight line
The straight line of the Ha Er response value sum maximum of point is as the cursor line in oil level gauge dial plate image；
Choose two points that position in described cursor line is different, be the first labelling point and the second labelling respectively
Point；
Obtain on straight line that is that be perpendicular to described cursor line and that pass described first labelling point and Ha Er response
Value, more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N1；
Obtain on straight line that is that be perpendicular to described cursor line and that pass described second labelling point and Ha Er response
Value, more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N2；
Judge the size of described N1 and N2, when described N1 is more than N2, described first labelling point is made
For the start position of pointer, using described second labelling point as the final position of pointer, when described N1 is less than
During N2, using described first labelling point as the final position of pointer, using described second labelling point as pointer
Start position；
According to described start position and described final position, it is calculated slope and the intercept of described cursor line；
According to the training stage in advance in the calibration points of oil level gauge dial plate image tagged, and described start position,
Described final position, described slope and described intercept, be calculated described cursor line at oil level gauge dial plate figure
The scale value pointed in Xiang.
Oil level detection method the most according to claim 1, it is characterised in that described to described oil level
Table dial plate image carries out Ha Er RESPONSE CALCULATION and obtains the Ha Er response diagram of oil level gauge dial plate image, including:
The color of described oil level gauge dial plate image is converted to YCbCr color space from RGB color；
Utilize red color component value and luminance component to carry out Difference Calculation, obtain the colour-difference component of correspondence；
Described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response of oil level gauge dial plate image
Figure.
Oil level detection method the most according to claim 2, it is characterised in that described to described color
Difference diagram carries out Ha Er RESPONSE CALCULATION, and the process of the Ha Er response diagram obtaining oil level gauge dial plate image includes:
With predetermined angle as step-length, described colour-difference component is rotated, and to each anglec of rotation
Colour-difference partial image once travels through, and is calculated the Ha Er response value of each pixel；
Choose each described pixel maximum Ha Er response value under different rotary angle successively, and will
The Ha Er response value of described maximum is as the final Ha Er response value of this pixel；
The final Ha Er response value of each described pixel is combined, forms the Kazakhstan of oil level gauge dial plate image
That response diagram.
Oil level detection method the most according to claim 1, it is characterised in that the described Kazakhstan of described acquisition
The process of each Local modulus maxima in your response diagram includes:
Travel through described Ha Er response diagram, search the Ha Er response value pixel more than described threshold value；
Successively in the local neighborhood of each described pixel, it is judged that the Ha Er response value that this pixel is corresponding
Whether it is Local modulus maxima；
If it is, pixel and Local modulus maxima are stored with the form of corresponding relation.
Oil level detection method the most according to claim 1, it is characterised in that described to each described office
Portion maximum point uses line fitting method to obtain each initial straight, according to described threshold value to each described at the beginning of
Beginning straight line is fitted revising, and obtains one group of straight line, by the Ha Er response value of pixel in each described straight line
The straight line of sum maximum includes as the process of the cursor line in oil level gauge dial plate image:
Use stochastic sampling unification algorism, from all Local modulus maximas, the most optionally two of which office
Portion's maximum point carries out fitting a straight line, obtains initial straight；
Utilize the remaining distance to the described initial straight Local modulus maxima less than described threshold value, to institute
State initial straight to be fitted revising, obtain candidate's straight line；
After described Local modulus maxima traversal is terminated, by all candidate's straight line set, comprised many
One group of straight line of bar candidate's straight line；
Calculate the Ha Er response value sum of pixel on every described straight line successively, and described Ha Er is responded
Value sum is as the confidence level of this straight line, and using straight line the highest for confidence level as in oil level gauge dial plate image
Cursor line.
6. an oil level detection system, it is characterised in that including:
Dial plate image acquisition unit, is used for obtaining oil level gauge image, according to the gradient angle of oil level gauge dial plate
Descriptor information, carries out template-matching operation to described oil level gauge image, obtains oil level gauge dial plate image；
Ha Er response unit, carries out Ha Er RESPONSE CALCULATION for described oil level gauge dial plate image, obtains oil level
The Ha Er response diagram of table dial plate image；
Statistic unit, for carrying out histogram information to each Ha Er response value in described Ha Er response diagram
Statistics, it is default for finding the Ha Er response value quantity of high numerical value and accounting for the percentage ratio of Ha Er response value total quantity
The quantile of percentage ratio, using Ha Er response value corresponding for described quantile as threshold value；
Local modulus maxima acquiring unit, for obtaining each local maximum in described Ha Er response diagram
Point；
Cursor line acquiring unit, for using line fitting method to obtain respectively each described Local modulus maxima
Individual initial straight, is fitted revising to each described initial straight according to described threshold value, obtains one group of straight line,
Using straight line maximum for the Ha Er response value sum of pixel in each described straight line as in oil level gauge dial plate image
Cursor line；
Pointer position acquiring unit, for choosing two points that position in described cursor line is different, be respectively
It is the first labelling point and the second labelling point；Obtain be perpendicular to described cursor line and through described first labelling
On the straight line selected and Ha Er response value is more than the number of the continuous image vegetarian refreshments of described threshold value, is designated as N1；Obtain
Take be perpendicular to described cursor line and through described second labelling point straight line on and Ha Er response value be more than
The number of the continuous image vegetarian refreshments of described threshold value, is designated as N2；Judge the size of described N1 and N2, work as institute
When stating N1 more than N2, using described first labelling point as the start position of pointer, by described second labelling
Point is as the final position of pointer, when described N1 is less than N2, using described first labelling point as pointer
Final position, using described second labelling point as the start position of pointer；
First computing unit, for according to described start position and described final position, is calculated described
The slope of cursor line and intercept；
Second computing unit, is used for according to the training stage in advance in the calibration points of oil level gauge dial plate image tagged,
And described start position, described final position, described slope and described intercept, it is calculated described finger
The scale value that needlework point in oil level gauge dial plate image.
Oil level detection system the most according to claim 6, it is characterised in that described Ha Er responds single
Unit, including:
Color conversion subelement, for turning the color of described oil level gauge dial plate image from RGB color
It is changed to YCbCr color space；
Difference diagram converting unit, is used for utilizing red color component value and luminance component to carry out Difference Calculation, obtains
Corresponding colour-difference component；
Sub-response unit, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains oil level gauge table
The Ha Er response diagram of dish image.
Oil level detection system the most according to claim 7, it is characterised in that described sub-response unit
Including:
Ha Er response value computing unit, for predetermined angle as step-length, is carried out described colour-difference component
Rotate, and the colour-difference partial image of each anglec of rotation is once traveled through, be calculated each pixel
The Ha Er response value of point；
Choose subelement, for choosing each described pixel maximum under different rotary angle successively
Ha Er response value, and using the Ha Er response value of described maximum as the final Ha Er response value of this pixel；
Combination subelement, for the final Ha Er response value of each described pixel being combined, forms oil
The Ha Er response diagram of position table dial plate image.
Oil level detection system the most according to claim 6, it is characterised in that described local maximum
Point acquiring unit includes:
Search subelement, be used for traveling through described Ha Er response diagram, search Ha Er response value more than described threshold value
Pixel；
Judgment sub-unit, for successively in the local neighborhood of each described pixel, it is judged that this pixel
Whether corresponding Ha Er response value is Local modulus maxima, if it is, perform storing sub-units；
Described storing sub-units, for carrying out pixel and Local modulus maxima with the form of corresponding relation
Storage.
Oil level detection system the most according to claim 6, it is characterised in that described cursor line obtains
Take unit to include:
Fitting a straight line subelement, is used for using stochastic sampling unification algorism, from all Local modulus maximas,
The most optionally two of which Local modulus maxima carries out fitting a straight line, obtains initial straight；
Revise subelement, for utilizing the remaining distance to the described initial straight office less than described threshold value
Portion's maximum point, is fitted described initial straight revising, obtains candidate's straight line；
Set subelement, for after terminating described Local modulus maxima traversal, by all candidate's straight lines
Set, obtains comprising one group of straight line of a plurality of candidate's straight line；
Cursor line obtains subelement, for calculating the Ha Er response value of pixel on every described straight line successively
Sum, and using described Ha Er response value sum as the confidence level of this straight line, and by the highest for confidence level straight
Line is as the cursor line in oil level gauge dial plate image.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895365A (en) * | 2017-11-01 | 2018-04-10 | 国网山东省电力公司电力科学研究院 | The image matching method and monitoring system of broken protection outside a kind of passway for transmitting electricity |
| CN111272256A (en) * | 2020-01-15 | 2020-06-12 | 南京智鹤电子科技有限公司 | Data processing method and device for oil level abnormity monitoring |
| CN113483849A (en) * | 2021-07-01 | 2021-10-08 | 上海申瑞继保电气有限公司 | Dynamic monitoring method for liquid level of transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101620268A (en) * | 2008-06-30 | 2010-01-06 | 巨鸥科技股份有限公司 | Remote tracking system and method thereof |
| CN103759758A (en) * | 2014-01-26 | 2014-04-30 | 哈尔滨工业大学 | Method for detecting position of automobile meter needle based on mechanical angle and scale identification |
-
2016
- 2016-03-28 CN CN201610187567.3A patent/CN105893943B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101620268A (en) * | 2008-06-30 | 2010-01-06 | 巨鸥科技股份有限公司 | Remote tracking system and method thereof |
| CN103759758A (en) * | 2014-01-26 | 2014-04-30 | 哈尔滨工业大学 | Method for detecting position of automobile meter needle based on mechanical angle and scale identification |
Non-Patent Citations (2)
| Title |
|---|
| 李滚: "基于CANNY算子的自适应双阈值油罐油位红外成像检测", 《电子测量与仪器学报》 * |
| 杨秀君: "基于图像处理的罐体液位检测方法的研究", 《中国优秀硕士学位论文全文数据库信息科技辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107895365A (en) * | 2017-11-01 | 2018-04-10 | 国网山东省电力公司电力科学研究院 | The image matching method and monitoring system of broken protection outside a kind of passway for transmitting electricity |
| CN107895365B (en) * | 2017-11-01 | 2020-08-18 | 国网山东省电力公司电力科学研究院 | Image matching method and monitoring system for power transmission channel external damage protection |
| CN111272256A (en) * | 2020-01-15 | 2020-06-12 | 南京智鹤电子科技有限公司 | Data processing method and device for oil level abnormity monitoring |
| CN111272256B (en) * | 2020-01-15 | 2021-05-18 | 南京智鹤电子科技有限公司 | Data processing method and device for oil level abnormity monitoring |
| CN113483849A (en) * | 2021-07-01 | 2021-10-08 | 上海申瑞继保电气有限公司 | Dynamic monitoring method for liquid level of transformer |
| CN113483849B (en) * | 2021-07-01 | 2023-10-17 | 上海申瑞继保电气有限公司 | Dynamic monitoring method for liquid level of transformer |
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