CN105868762A - Method and system for reading SF<6> meter - Google Patents
Method and system for reading SF<6> meter Download PDFInfo
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- CN105868762A CN105868762A CN201610183391.4A CN201610183391A CN105868762A CN 105868762 A CN105868762 A CN 105868762A CN 201610183391 A CN201610183391 A CN 201610183391A CN 105868762 A CN105868762 A CN 105868762A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/44—Local feature extraction by analysis of parts of the pattern, e.g. by detecting edges, contours, loops, corners, strokes or intersections; Connectivity analysis, e.g. of connected components
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/50—Extraction of image or video features by performing operations within image blocks; by using histograms, e.g. histogram of oriented gradients [HoG]; by summing image-intensity values; Projection analysis
- G06V10/507—Summing image-intensity values; Histogram projection analysis
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
- G06V10/56—Extraction of image or video features relating to colour
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V2201/00—Indexing scheme relating to image or video recognition or understanding
- G06V2201/02—Recognising information on displays, dials, clocks
Abstract
The invention discloses a method and a system for reading a SF<6> meter. The method comprises the following steps: based on geometrical characteristics of a pointer of the SF<6> meter and gray scale information distribution features of a dial, conducting haar response calculation on a dial image so as to obtain a corresponding haar response graph. Since a pointer area has a higher haar response value with respect to a non-pointer area, the method conducts statistics on the distribution of the haar response values through a histogram, and takes the haar response value corresponding with a quantile which meets a preset requirement as a threshold value, selects a regional maximum point in the haar response graph; and through the straight line fitting method, the method takes the straight line with the maximum sum of haar response values as the pointer of the dial image, finally based on reference information of the pointer and scale points marked on the dial image, obtains a scale value pointed by the pointer in the dial image. Therefore, the method and the system release human labor and reduce safety hazards.
Description
Technical field
The present invention relates to SF6Table technical field, in particular, relates to a kind of SF6The number reading method of table and be
System.
Background technology
SF6Table includes SF6Density meter, SF6Pressure gauges etc., are mainly used in monitoring SF6The concentration of gas.Pass through
SF6The monitoring of table can find the SF of leakage in time6Gas, in order to adopt an effective measure in time, prevents accident
Generation.Therefore, to SF6Table carry out Daily Round Check be in the artificial O&M of transformer station very important project it
One.
At present, mainly by the way of manual inspection to SF6The instruction state of list index detects.But
Existed by manual inspection and patrol and examine dangerous and patrol and examine the problems such as efficiency is low.Therefore, how to provide a kind of
SF6Number reading method and the system of table complete patrol task, and 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 SF of the present invention6The number reading method of table and system, to realize patrolling and examining completing
While task, liberate manpower, reduce potential safety hazard.
A kind of SF6The number reading method of table, including:
Obtain SF6Table image, according to SF6The gradient angle descriptor information of the dial plate of table, to described SF6
Table image carries out template-matching operation, obtains dial plate image；
Described dial plate image is carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of described dial plate image；
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 described dial plate image；
Obtain the pixel that is perpendicular to the continuous print of described cursor line and Ha Er response value more than described threshold value
Number, using there is most pixel position as the start position of pointer, will there is minimum pixel
Position is as the final position of pointer；
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 training dial plate image tagged, and described start position,
Described final position, described slope and described intercept, be calculated described cursor line at described dial plate image
The scale value of middle sensing.
Preferably, described described dial plate image is carried out Ha Er RESPONSE CALCULATION, obtain described dial plate image
Ha Er response diagram includes:
Described dial plate image is carried out color space conversion, by the color of described dial plate image from RGB color
Space is converted to YCbCr color space, and utilizes 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 diagram of described dial plate image.
Preferably, described described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtain described dial plate image
The process of Ha Er response diagram include:
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 Ha Er of described dial plate image
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 cursor line in described dial plate image
Process include:
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 described dial plate image
Cursor line.
A kind of SF6The frame of reference of table, including:
Dial plate image acquisition unit, is used for obtaining SF6Table image, according to SF6The gradient angle of the dial plate of table
Descriptor information, to described SF6Table image carries out template-matching operation, obtains dial plate image；
First computing unit, carries out Ha Er RESPONSE CALCULATION for described dial plate image, obtains described dial plate figure
The Ha Er response diagram of picture；
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 described dial plate image
Cursor line；
Pointer position acquiring unit, for obtaining continuous print and the Ha Er response value being perpendicular to described cursor line
More than the number of the pixel of described threshold value, using the position with most pixel as the starting point position of pointer
Put, using the position with minimum pixel as the final position of pointer；
Second computing unit, for according to described start position and described final position, is calculated described
The slope of cursor line and intercept；
3rd computing unit, for training the calibration points of dial plate image tagged in advance according to the training stage,
And described start position, described final position, described slope and described intercept, it is calculated described finger
The scale value that needlework point in described dial plate image.
Preferably, described first computing unit includes:
Color conversion subelement, for carrying out color space conversion to described dial plate image, by described dial plate
The color of image is converted to YCbCr color space from RGB color, and utilize red color component value with
Luminance component carries out Difference Calculation, obtains the colour-difference component of correspondence；
First computation subunit, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains described
The Ha Er response diagram of dial plate image.
Preferably, described first computing unit includes:
Second computation subunit, for predetermined angle as step-length, rotates described colour-difference component,
And the colour-difference partial image of each anglec of rotation is once traveled through, it is calculated the Kazakhstan of each pixel
That response value；
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 institute
State the Ha Er response diagram of dial plate image.
Preferably, 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, 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 described dial plate image.
From above-mentioned technical scheme it can be seen that the invention discloses a kind of SF6The number reading method of table and be
System, according to SF6The geometric properties of the cursor line of table and SF6The dial plate half-tone information characteristic distributions of table, to dial plate
Image carries out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of correspondence, owing to cursor line region is relative to non-
Pointer area has higher Ha Er response value, and therefore, Ha Er response value is divided by the present invention by rectangular histogram
Cloth is added up, and using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, screening
Go out the Local modulus maxima in Ha Er response diagram.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 maximum straight line of value sum as the cursor line in dial plate image, finally according to cursor line start position,
Final position, slope, intercept and training stage, in advance in the calibration points of training dial plate image tagged, obtain
The scale value pointed in dial plate image to cursor line.It can be seen that the present invention is compared to existing technologies,
Go collection in worksite data without patrol officer, therefore reached while completing patrol task, liberate people
Power, reduces 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 SF disclosed in the embodiment of the present invention6The number reading method flow chart of table；
Fig. 2 is a kind of SF disclosed in the embodiment of the present invention6The structural representation of the frame of reference of table.
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 SF6The number reading method of table and system, to realize appointing completing to patrol and examine
While business, liberate manpower, reduce potential safety hazard.
The basic scheme of the present invention is: based on SF6Table instruction state-detection demand, it is first determined SF6Table is obtaining
The SF taken6Position in table image；Then SF is treated6After table object determines, at SF6Seek in the range of the dial plate of table
Look for cursor line position；Finally according to dial reading rule, calculate SF6Table currently indicate state.
Concrete scheme is as follows:
See Fig. 1, a kind of SF disclosed in the embodiment of the present invention6The number reading method flow chart of table, including step:
Step S11, acquisition SF6Table image, according to SF6The gradient angle descriptor information of the dial plate of table,
To described SF6Table image carries out template-matching operation, obtains dial plate image；
Wherein, SF6Table 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) video camera is utilized to obtain SF6Table image, and any one two field picture intercepted is schemed as training
Picture, and from this training image, obtain the dial plate subject area only comprising 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 dial plate, and preserve
To internal memory.
Step S12, described dial plate image carry out Ha Er RESPONSE CALCULATION, and the Ha Er obtaining described dial plate image rings
Ying Tu；
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 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 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 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.
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 training dial plate image tagged, and cursor line
Parameter information, be calculated the scale value that described cursor line is pointed in dial plate image.
The parameter information of cursor line includes: start position, final position, slope and intercept.
Wherein, the training stage is at SF6The process of table dial plate image tagged calibration points is: at SF6The training figure of table
As the calibration points in upper labelling dial plate, and the position of each calibration points is carried out record, then, according to labelling
Calibration points, be manually entered the scale value of correspondence, and preserve.
In summary it can be seen, the present invention is according to SF6The geometric properties of the cursor line of table and SF6The dial plate gray scale of table
Information distribution feature, carries out Ha Er RESPONSE CALCULATION to dial plate image, obtains the Ha Er response diagram of correspondence, just
Step filter background interference；Owing to there is higher Ha Er response value in cursor line region relative to non-pointer region,
Therefore, the distribution of Ha Er response value is added up by the present invention by rectangular histogram, and will meet preset requirement
Ha Er response value corresponding to quantile as threshold value, filter out the Local modulus maxima in Ha Er response diagram,
Filter background interference further；Owing to the set of Local modulus maxima including some conducts in cursor line
The point of fitting a straight line, therefore, the present invention method by fitting a straight line, Ha Er response value sum is maximum
Straight line as the cursor line in dial plate image, finally according to the start position of cursor line, final position,
Slope, intercept and training stage in the calibration points of training dial plate image tagged, obtain cursor line and exist in advance
The scale value pointed in dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol and examine
Personnel go collection in worksite data, have therefore reached while completing patrol task, liberate manpower, reduce
The purpose of potential safety hazard.
For optimizing above-described embodiment further, step S12 specifically includes:
Step S121, described dial plate image is carried out color space conversion, by the color of described dial plate image
Be converted to YCbCr color space from RGB color, and utilize red color component value to enter with luminance component
Row Difference Calculation, obtains the colour-difference component of correspondence；
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, described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtain described dial plate image
Ha Er response diagram.
For optimizing above-described embodiment further, step S13 specifically includes:
Step S131, 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 predetermined angle is actually needed, such as 10 °.
It should be noted that the SF of actual substation field6List index may point to arbitrarily angled, in order to enable
Enough allow cursor line and Ha Er template matching, with predetermined angle as step-length, described colour-difference component can be carried out
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.
Step S132, 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 S133, the final Ha Er response value of each described pixel is combined, forms dial plate image
Ha Er response diagram.
For optimizing above-described embodiment further, step S15 specifically includes:
Step S151, traversal Ha Er response diagram, search the Ha Er response value pixel more than threshold value；
Step S152, 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 S153；
Step S153, 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 S16 specifically includes:
Step S161, 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 (RANdomSample 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 S162, 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 S163, 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 S164, 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 dial plate figure
Cursor line in Xiang.
In summary it can be seen, the present invention is according to SF6The geometric properties of the cursor line of table and SF6The dial plate gray scale of table
Information distribution feature, carries out Ha Er RESPONSE CALCULATION to dial plate image, obtains the Ha Er response diagram of correspondence, just
Step filter background interference；Owing to there is higher Ha Er response value in cursor line region relative to non-pointer region,
Therefore, the distribution of Ha Er response value is added up by the present invention by rectangular histogram, and will meet preset requirement
Ha Er response value corresponding to quantile as threshold value, filter out the Local modulus maxima in Ha Er response diagram,
Filter background interference further；Owing to the set of Local modulus maxima including some conducts in cursor line
The point of fitting a straight line, therefore, the present invention method by fitting a straight line, Ha Er response value sum is maximum
Straight line as the cursor line in dial plate image, finally according to the start position of cursor line, final position,
Slope, intercept and training stage in the calibration points of training dial plate image tagged, obtain cursor line and exist in advance
The scale value pointed in dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol and examine
Personnel go collection in worksite data, have therefore reached 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 SF6The frame of reference of table.
See Fig. 2, a kind of SF disclosed in the embodiment of the present invention6The structural representation of the frame of reference of table, bag
Include:
Dial plate image acquisition unit 21, is used for obtaining SF6Table image, according to SF6The gradient of the dial plate of table
Angle descriptor information, to described SF6Table image carries out template-matching operation, obtains dial plate image；
Wherein, SF6Table 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) video camera is utilized to obtain SF6The training image of table, and obtain from this training image and only comprise
The dial plate subject area of 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 dial plate, and preserve
To internal memory.
First computing unit 22, carries out Ha Er RESPONSE CALCULATION for described dial plate image, obtains described dial plate
The Ha Er response diagram of 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 in dial plate image
Cursor line；
Pointer position acquiring unit 26, for obtaining the continuous print being perpendicular to described cursor line and Ha Er response
Value is more than the number of pixel of described threshold value, using the position with most pixel as the starting point of pointer
Position, using the position with minimum pixel as the final position of pointer；
Second computing unit 27, for according to described start position and described final position, is calculated institute
State slope and the intercept of cursor line；
3rd computing unit 28, for training the calibration points of dial plate image tagged in advance according to the training stage,
And described start position, described final position, described slope and described intercept, it is calculated described finger
The scale value that needlework point in dial plate image.
Wherein, the training stage is at SF6The process of table dial plate image tagged calibration points is: at SF6The training figure of table
As the calibration points in upper labelling dial plate, and the position of each calibration points is carried out record, then, according to labelling
Calibration points, be manually entered the scale value of correspondence, and preserve.
In summary it can be seen, the present invention is according to SF6The geometric properties of the cursor line of table and SF6The dial plate gray scale of table
Information distribution feature, carries out Ha Er RESPONSE CALCULATION to dial plate image, obtains the Ha Er response diagram of correspondence, just
Step filter background interference；Owing to there is higher Ha Er response value in cursor line region relative to non-pointer region,
Therefore, the distribution of Ha Er response value is added up by the present invention by rectangular histogram, and will meet preset requirement
Ha Er response value corresponding to quantile as threshold value, filter out the Local modulus maxima in Ha Er response diagram,
Filter background interference further；Owing to the set of Local modulus maxima including some conducts in cursor line
The point of fitting a straight line, therefore, the present invention method by fitting a straight line, Ha Er response value sum is maximum
Straight line as the cursor line in dial plate image, finally according to the start position of cursor line, final position,
Slope, intercept and training stage in the calibration points of training dial plate image tagged, obtain cursor line and exist in advance
The scale value pointed in dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol and examine
Personnel go collection in worksite data, have therefore reached while completing patrol task, liberate manpower, reduce
The purpose of potential safety hazard.
For optimizing above-described embodiment further, the first computing unit 22 includes:
Color conversion subelement 221, for carrying out color space conversion to described dial plate image, by described table
The color of dish image is converted to YCbCr color space from RGB color, and utilizes red color component value
Carry out Difference Calculation with luminance component, obtain the colour-difference component of correspondence；
First computation subunit 222, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains institute
State the Ha Er response diagram of dial plate image.
For optimizing above-described embodiment further, the first computing unit 23 includes:
Second computation subunit 231, for predetermined angle as step-length, revolves described colour-difference component
Turn, and the colour-difference partial image of each anglec of rotation is once traveled through, be calculated each pixel
Ha Er response value；
Depending on the concrete foundation of the numerical value of predetermined angle is actually needed, such as 10 °.
It should be noted that the SF of actual substation field6List index may point to arbitrarily angled, in order to enable
Enough allow cursor line and Ha Er template matching, with predetermined angle as step-length, described colour-difference component can be carried out
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 232, 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 233, for the final Ha Er response value of each described pixel being combined, is formed
The Ha Er response diagram of dial plate image.
For optimizing above-described embodiment further, Local modulus maxima acquiring unit 25 includes:
Search subelement 251, 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 252, 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 253；
Storing sub-units 253, 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 26 includes:
Fitting a straight line subelement 261, 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 (RANdomSample 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 262, 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 263, 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 264, 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 dial plate image.
In summary it can be seen, the present invention is according to SF6The geometric properties of the cursor line of table and SF6The dial plate gray scale of table
Information distribution feature, carries out Ha Er RESPONSE CALCULATION to dial plate image, obtains the Ha Er response diagram of correspondence, just
Step filter background interference；Owing to there is higher Ha Er response value in cursor line region relative to non-pointer region,
Therefore, the distribution of Ha Er response value is added up by the present invention by rectangular histogram, and will meet preset requirement
Ha Er response value corresponding to quantile as threshold value, filter out the Local modulus maxima in Ha Er response diagram,
Filter background interference further；Owing to the set of Local modulus maxima including some conducts in cursor line
The point of fitting a straight line, therefore, the present invention method by fitting a straight line, Ha Er response value sum is maximum
Straight line as the cursor line in dial plate image, finally according to the start position of cursor line, final position,
Slope, intercept and training stage in the calibration points of training dial plate image tagged, obtain cursor line and exist in advance
The scale value pointed in dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol and examine
Personnel go collection in worksite data, have therefore reached 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. a SF6The number reading method of table, it is characterised in that including:
Obtain SF6Table image, according to SF6The gradient angle descriptor information of the dial plate of table, to described SF6
Table image carries out template-matching operation, obtains dial plate image；
Described dial plate image is carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of described dial plate image；
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 described dial plate image；
Obtain the pixel that is perpendicular to the continuous print of described cursor line and Ha Er response value more than described threshold value
Number, using there is most pixel position as the start position of pointer, will there is minimum pixel
Position is as the final position of pointer；
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 training dial plate image tagged, and described start position,
Described final position, described slope and described intercept, be calculated described cursor line at described dial plate image
The scale value of middle sensing.
Number reading method the most according to claim 1, it is characterised in that described to described dial plate image
Carrying out Ha Er RESPONSE CALCULATION, the Ha Er response diagram obtaining described dial plate image includes:
Described dial plate image is carried out color space conversion, by the color of described dial plate image from RGB color
Space is converted to YCbCr color space, and utilizes 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 diagram of described dial plate image.
Number reading method the most according to claim 1, it is characterised in that described to described color difference
Figure carries out Ha Er RESPONSE CALCULATION, and the process of the Ha Er response diagram obtaining described 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 Ha Er of described dial plate image
Response diagram.
Number reading method the most according to claim 1, it is characterised in that the described Ha Er of described acquisition rings
Should the process of each Local modulus maxima in figure include:
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.
Number reading method the most according to claim 1, it is characterised in that described to each described local pole
Big value point uses line fitting method to obtain each initial straight, according to described threshold value to each described initial straight
Line is fitted revising, and obtains one group of straight line, by the Ha Er response value sum of pixel in each described straight line
Maximum straight line includes as the process of the cursor line in described 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 described dial plate image
Cursor line.
6. a SF6The frame of reference of table, it is characterised in that including:
Dial plate image acquisition unit, is used for obtaining SF6Table image, according to SF6The gradient angle of the dial plate of table
Descriptor information, to described SF6Table image carries out template-matching operation, obtains dial plate image；
First computing unit, carries out Ha Er RESPONSE CALCULATION for described dial plate image, obtains described dial plate figure
The Ha Er response diagram of picture；
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 described dial plate image
Cursor line；
Pointer position acquiring unit, for obtaining continuous print and the Ha Er response value being perpendicular to described cursor line
More than the number of the pixel of described threshold value, using the position with most pixel as the starting point position of pointer
Put, using the position with minimum pixel as the final position of pointer；
Second computing unit, for according to described start position and described final position, is calculated described
The slope of cursor line and intercept；
3rd computing unit, for training the calibration points of dial plate image tagged in advance according to the training stage,
And described start position, described final position, described slope and described intercept, it is calculated described finger
The scale value that needlework point in described dial plate image.
Frame of reference the most according to claim 6, it is characterised in that described first computing unit bag
Include:
Color conversion subelement, for carrying out color space conversion to described dial plate image, by described dial plate
The color of image is converted to YCbCr color space from RGB color, and utilize red color component value with
Luminance component carries out Difference Calculation, obtains the colour-difference component of correspondence；
First computation subunit, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains described
The Ha Er response diagram of dial plate image.
Frame of reference the most according to claim 6, it is characterised in that described first computing unit bag
Include:
Second computation subunit, for predetermined angle as step-length, rotates described colour-difference component,
And the colour-difference partial image of each anglec of rotation is once traveled through, it is calculated the Kazakhstan of each pixel
That response value；
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 institute
State the Ha Er response diagram of dial plate image.
Frame of reference the most according to claim 6, it is characterised in that described Local modulus maxima obtains
Take unit to include:
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.
Frame of reference the most according to claim 6, it is characterised in that described cursor line obtains single
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 described dial plate image.
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