CN105868763A - Method and system for reading oil gauge - Google Patents
Method and system for reading oil gauge Download PDFInfo
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- CN105868763A CN105868763A CN201610183935.7A CN201610183935A CN105868763A CN 105868763 A CN105868763 A CN 105868763A CN 201610183935 A CN201610183935 A CN 201610183935A CN 105868763 A CN105868763 A CN 105868763A
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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
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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
- G06V10/70—Arrangements for image or video recognition or understanding using pattern recognition or machine learning
- G06V10/74—Image or video pattern matching; Proximity measures in feature spaces
- G06V10/75—Organisation of the matching processes, e.g. simultaneous or sequential comparisons of image or video features; Coarse-fine approaches, e.g. multi-scale approaches; using context analysis; Selection of dictionaries
- G06V10/751—Comparing pixel values or logical combinations thereof, or feature values having positional relevance, e.g. template matching
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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 an oil gauge. The method comprises the following steps: based on geometrical characteristics of a pointer of the oil gauge and gray scale information distribution features of a dial of the oil gauge, conducting haar response calculation on a dial image of the oil gauge 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 of the oil gauge, finally based on reference information of the pointer and scale points marked on the dial image of the oil gauge, obtaining a scale value pointed by the pointer in the dial image of the oil gauge. Therefore, the method and the system release human labor and reduce safety hazards.
Description
Technical field
The present invention relates to oil level gauge technical field, in particular, relate to number reading method and the system of a kind of oil level gauge.
Background technology
Oil level gauge is a kind of instrument how many for the oil mass showing in target fuel tank, the fluid amount in target fuel tank can be understood in time by the monitoring of reading current to described oil level gauge, thus prevent causing equipment to be burned out because the oil mass in target fuel tank is very few or problem out of service.Therefore, it is one of very important project in the artificial O&M of transformer station that oil level gauge carries out Daily Round Check.
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 to provide the number reading method of a kind of oil level gauge and system to complete patrol task, to liberate manpower, to reduce potential safety hazard be those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention discloses number reading method and the system of a kind of oil level gauge, to realize while completing patrol task, liberates manpower, reduces potential safety hazard.
A kind of number reading method of oil level gauge, including:
Obtain oil level gauge image, according to the gradient angle descriptor information of oil level gauge dial plate, described oil level gauge image is carried out template-matching 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 response diagram of oil level gauge dial plate image；
Each Ha Er response value in described Ha Er response diagram is carried out histogram information statistics, the Ha Er response value quantity finding high numerical value accounts for the quantile that percentage ratio is preset percentage of Ha Er response value total quantity, 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 each described Local modulus maxima, it is fitted revising to each described initial straight according to described threshold value, obtain one group of straight line, using straight line maximum for the Ha Er response value sum of pixel in each described straight line as the cursor line in oil level gauge dial plate image；
Obtain the number being perpendicular to the continuous print of described cursor line and Ha Er response value more than the pixel of described threshold value, using the position with most pixel as the start position of pointer, using the position with minimum pixel 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 oil level gauge dial plate image tagged, and described start position, described final position, described slope and described intercept, it is calculated the scale value that described cursor line is pointed in oil level gauge dial plate image.
Preferably, in above-mentioned number reading method, described described oil level gauge dial plate image is carried out Ha Er RESPONSE CALCULATION obtain 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 diagram of oil level gauge dial plate image.
Preferably, in above-mentioned number reading method, described described colour-difference component being carried out Ha Er RESPONSE CALCULATION, 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 the colour-difference partial image of each anglec of rotation is once traveled through, be calculated the Ha Er response value of each pixel；
Choose each described pixel maximum Ha Er response value under different rotary angle successively, and using the Ha Er response value of described maximum 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 response diagram of oil level gauge dial plate image.
Preferably, in above-mentioned number reading method, 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 whether the Ha Er response value that this pixel is corresponding is Local modulus maxima；
If it is, pixel and Local modulus maxima are stored with the form of corresponding relation.
Preferably, in above-mentioned number reading method, described to each described Local modulus maxima use line fitting method obtain each initial straight, it is fitted revising to each described initial straight according to described threshold value, obtain one group of straight line, straight line maximum for the Ha Er response value sum of pixel in each described straight line included as the process of the cursor line in oil level gauge dial plate image:
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；
Utilize the remaining distance to the described initial straight Local modulus maxima less than described threshold value, be fitted described initial straight revising, obtain candidate's straight line；
After described Local modulus maxima traversal is terminated, by all candidate's straight line set, obtain comprising one group of straight line of a plurality of candidate's straight line；
Calculate the Ha Er response value sum of pixel on every described straight line successively, and using described Ha Er response value sum as the confidence level of this straight line, and using straight line the highest for confidence level as the cursor line in oil level gauge dial plate image.
A kind of frame of reference of oil level gauge, including:
Dial plate image acquisition unit, is used for obtaining oil level gauge image, according to the gradient angle descriptor information of oil level gauge dial plate, described oil level gauge image is carried out template-matching operation, 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 the Ha Er response diagram of oil level gauge dial plate image；
Statistic unit, for each Ha Er response value in described Ha Er response diagram is carried out histogram information statistics, the Ha Er response value quantity finding high numerical value accounts for the quantile that percentage ratio is preset percentage of Ha Er response value total quantity, using Ha Er response value corresponding for described quantile as threshold value；
Local modulus maxima acquiring unit, for obtaining each Local modulus maxima in described Ha Er response diagram；
Cursor line acquiring unit, for using line fitting method to obtain each initial straight each described Local modulus maxima, it is fitted revising to each described initial straight according to described threshold value, obtain one group of straight line, using straight line maximum for the Ha Er response value sum of pixel in each described straight line as the cursor line in oil level gauge dial plate image；
Pointer position acquiring unit, for obtaining the continuous print being perpendicular to described cursor line and the Ha Er response value number more than the pixel of described threshold value, using the position with most pixel as the start position of pointer, using the position with minimum pixel as the final position of pointer；
First computing unit, for according to described start position and described final position, is calculated slope and the intercept of described cursor line；
Second computing unit, 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 the scale value that described cursor line is pointed in oil level gauge dial plate image.
Preferably, in above-mentioned frame of reference, described Ha Er response unit, including:
Color conversion subelement, for being converted to YCbCr color space by the color of described oil level gauge dial plate image from RGB color；
Difference diagram converting unit, is used for utilizing red color component value and luminance component to carry out Difference Calculation, obtains the colour-difference component of correspondence；
Sub-response unit, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of oil level gauge dial plate image.
Preferably, in above-mentioned frame of reference, described sub-response unit includes:
Ha Er response value computing unit, for predetermined angle as step-length, rotates described colour-difference component, and once travels through the colour-difference partial image of each anglec of rotation, be calculated the Ha Er response value of each pixel；
Choose subelement, for choosing each described pixel maximum Ha Er response value under different rotary angle successively, 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 the Ha Er response diagram of oil level gauge dial plate image.
Preferably, in above-mentioned frame of reference, described Local modulus maxima acquiring unit includes:
Search subelement, be used for traveling through described Ha Er response diagram, search the Ha Er response value pixel more than described threshold value；
Judgment sub-unit, for successively in the local neighborhood of each described pixel, it is judged that whether the Ha Er response value that this pixel is corresponding is Local modulus maxima, if it is, perform storing sub-units；
Described storing sub-units, for storing pixel and Local modulus maxima with the form of corresponding relation.
Preferably, in above-mentioned frame of reference, described cursor line acquiring unit includes:
Fitting a straight line subelement, is used for using stochastic sampling unification algorism, and 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 Local modulus maxima less than described threshold value, be fitted described initial straight revising, obtain candidate's straight line；
Set subelement, for, after terminating described Local modulus maxima traversal, by all candidate's straight line set, obtaining 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 sum of pixel on every described straight line successively, and using described Ha Er response value sum as the confidence level of this straight line, and using straight line the highest for confidence level as the cursor line in oil level gauge dial plate image.
Can be seen that from above-mentioned technical scheme, the invention discloses number reading method and the system of a kind of oil level gauge, the geometric properties of the cursor line according to oil level gauge and oil level gauge dial plate half-tone information characteristic distributions, oil level gauge dial plate image is carried out Ha Er RESPONSE CALCULATION, obtain the Ha Er response diagram of correspondence, 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 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 in cursor line some as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally according to start position, final position, slope, intercept and training stage of cursor line in advance in the calibration points of oil level gauge dial plate image tagged, obtain the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, has therefore reached while completing patrol 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, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in describing below is only embodiments of the invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to disclosed accompanying drawing.
Fig. 1 is the number reading method flow chart of a kind of oil level gauge disclosed in the embodiment of the present invention；
Fig. 2 is the structural representation of the frame of reference of a kind of oil level gauge 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 clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly fall into the scope of protection of the invention.
The embodiment of the invention discloses number reading method and the system of a kind of oil level gauge, to realize while completing patrol task, 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, in the range of oil level gauge dial plate, cursor line position is found；Finally according to dial reading rule, calculate oil level gauge currently indicates state.
Concrete scheme is as follows:
See Fig. 1, the number reading method flow chart of a kind of oil level gauge disclosed in the embodiment of the present invention, including step:
Step S11, acquisition oil level gauge image, according to the gradient angle descriptor information of oil level gauge dial plate, carry out template-matching operation to described oil level gauge image, obtain 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 from this training image, obtain the dial plate subject area only comprising oil level gauge dial plate；
(2) application one piece and training image memory headroom of the same size, for depositing the template image (i.e. Mask figure) obtained according to training image, this template image is a black and white binary image, white portion represents dial plate subject area, and 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 Grad and the angle value of each pixel successively, 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 the Ha Er response diagram of oil level gauge dial plate image；
Represent it should be noted that the Lis Hartel in Ha Er response diagram levies the difference that pixel value sum sum (black) that (haar) covered and white fills pixel value sum sum (in vain) that region is covered by Ha Er template filled black region:
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, the Ha Er response value quantity finding high numerical value accounts for the quantile that percentage ratio is preset percentage of Ha Er response value total quantity, 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 does not limits at this.
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, do not fix sequencing, step S13 can be first carried out, rear execution step S14, or first carry out step S14, rear execution step 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, line fitting method is used to obtain each initial straight each described Local modulus maxima, it is fitted revising to each described initial straight according to described threshold value, obtain one group of straight line, using straight line maximum for the Ha Er response value sum of pixel in each described straight line as the cursor line in oil level gauge dial plate image.
Step S16, the start position obtaining cursor line and final position；
Concrete, obtain the number being perpendicular to the continuous print of described cursor line and Ha Er response value more than the pixel of described threshold value, using the position of the cursor line with most pixel as the start position of pointer, using the position with minimum pixel as the final position of pointer；Or random two the different location points intercepted in described cursor line, it is designated as primary importance point and second position point, obtain and be perpendicular to described cursor line and pass the number that the continuous print Ha Er response value on the straight line of described primary importance point and second position point is more than the pixel of described threshold value, judge the size of the number of the number of the pixel corresponding with described primary importance point and pixel corresponding to second position point, using less for pixel quantity location point as the final position of pointer, using a fairly large number of for pixel location point as the start position of pointer.
Step S17, according to described start position and described final position, be calculated slope and the intercept of described cursor line；
Step S18, according to the training stage in advance in the calibration points of oil level gauge dial plate image tagged, and the parameter information of cursor line, be 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: the calibration points in labelling dial plate on the training image of oil level gauge, and the position of each calibration points is carried out record, then, according to the calibration points of labelling, it is manually entered the scale value of correspondence, and preserves.
In summary it can be seen, the present invention, according to the geometric properties of the cursor line of oil level gauge and oil level gauge dial plate half-tone information characteristic distributions, carries out Ha Er RESPONSE CALCULATION to oil level gauge dial plate image, obtains the Ha Er response diagram of correspondence, and preliminary filter background disturbs；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 using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filtering out the Local modulus maxima in Ha Er response diagram, further filter background disturbs；Owing to the set of Local modulus maxima including in cursor line some as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally according to start position, final position, slope, intercept and training stage of cursor line in advance in the calibration points of oil level gauge dial plate image tagged, obtain the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, has therefore reached while completing patrol task, liberate manpower, reduce the purpose of potential safety hazard.
It is appreciated of course that, if oil level is too low or can not supplement fluid in time, the normal use of equipment may be affected, therefore, when oil level is too low, in order to user to be made in time prompting, after described step S18, can also include: judge whether the scale value pointed by described cursor line is in oil level gauge dial plate is more than preset value, if it does not, outputting alarm signal.
For optimizing above-described embodiment further, step S12 specifically includes:
Step S121, it is YCbCr color space by the color of oil level gauge dial plate image from RGB (RGB) color space conversion；
Wherein, YCbCr sometimes can be written as: YCBCR or Y'CBCR, is the one of color space, it will usually the image continuous processing in film, or in digital photographic systems.Y' is that brightness (luma) composition CB and CR of color is then for blue and red concentration excursion amount composition.Y' and Y is different, and Y is exactly so-called lumen, represent light concentration 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 colour-difference component of correspondence；
Step S123, described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtain the Ha Er response diagram of oil level gauge dial plate image.
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 the colour-difference partial image of each anglec of rotation is once traveled through, be 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 allow cursor line and Ha Er template matching, can be with predetermined angle as step-length, described colour-difference component is rotated, and the colour-difference partial image of each anglec of rotation is once traveled through, it is calculated the Ha Er response value of each pixel.
Step S1232, choose each described pixel maximum Ha Er response value under different rotary angle successively, 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 the Ha Er response diagram of oil level gauge dial plate 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 whether the Ha Er response value that this pixel is corresponding 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 get rid of 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 a kind of to calculate the mathematical model parameter of data according to one group of sample data set comprising abnormal data, obtains the algorithm of effective sample data.
The basic assumption of RANSAC algorithm is to comprise just data (inliers in sample, the data that can be described by model), also abnormal data (outliers, normal range is far, cannot adapt to the data of mathematical model in deviation) is comprised, i.e. containing noise in data set.These abnormal datas are likely due to the generations such as the calculating of the measurement of mistake, the hypothesis of mistake, mistake.RANSAC also assumes that simultaneously, given one group of correct data, there is the method that can calculate the model parameter meeting these data.
Step S152, utilize the remaining distance to described initial straight less than the Local modulus maxima of described threshold value, be fitted described initial straight revising, obtain candidate's straight line；
Wherein, by judging that the Local modulus maxima distance to initial straight, whether less than threshold value, judges that this Local modulus maxima is whether 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 using described Ha Er response value sum as the confidence level of this straight line, and using straight line the highest for confidence level as the cursor line in oil level gauge dial plate image.
In summary it can be seen, the present invention is according to the geometric properties of the cursor line of oil level gauge and oil level gauge dial plate half-tone information characteristic distributions, oil level gauge dial plate after carrying out color space conversion being carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of correspondence, preliminary filter background disturbs；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 using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filtering out the Local modulus maxima in Ha Er response diagram, further filter background disturbs；Owing to the set of Local modulus maxima including in cursor line some as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally according to start position, final position, slope, intercept and training stage of cursor line in advance in the calibration points of oil level gauge dial plate image tagged, obtain the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, has therefore reached while completing patrol task, liberate manpower, reduce the purpose of potential safety hazard.
Corresponding with said method embodiment, the invention also discloses the frame of reference of a kind of oil level gauge.
See Fig. 2, the structural representation of the frame of reference of a kind of oil level gauge 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 descriptor information of oil level gauge dial plate, described oil level gauge image is carried out 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 from this training image, obtain the dial plate subject area only comprising oil level gauge dial plate；
(2) application one piece and training image memory headroom of the same size, for depositing the template image (i.e. Mask figure) obtained according to training image, this template image is a black and white binary image, white portion represents dial plate subject area, and 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 Grad and the angle value of each pixel successively, 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 the Ha Er response diagram of oil level gauge dial plate image；
Represent it should be noted that the Lis Hartel in Ha Er response diagram levies the difference that pixel value sum sum (black) that (haar) covered and white fills pixel value sum sum (in vain) that region is covered by Ha Er template filled black region:
Sum (black)-sum (in vain) or sum (in vain)-sum (black).
Statistic unit 23, for each Ha Er response value in described Ha Er response diagram is carried out histogram information statistics, the Ha Er response value quantity finding high numerical value accounts for the quantile that percentage ratio is preset percentage of Ha Er response value total quantity, 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 does not limits at this.
Local modulus maxima acquiring unit 24, for obtaining each Local modulus maxima in described Ha Er response diagram；
Cursor line acquiring unit 25, for using line fitting method to obtain each initial straight each described Local modulus maxima, it is fitted revising to each described initial straight according to described threshold value, obtain one group of straight line, using straight line maximum for the Ha Er response value sum of pixel in each described straight line as the cursor line in oil level gauge dial plate image；
Pointer position acquiring unit 26, for obtaining the continuous print being perpendicular to described cursor line and the Ha Er response value number more than the pixel of described threshold value, using the position with most pixel as the start position of pointer, using the position with minimum pixel as the final position of pointer；
First computing unit 27, for according to described start position and described final position, is calculated slope and the intercept of described cursor line；
Second computing unit 28, 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 the scale value that described 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: the calibration points in labelling dial plate on the training image of oil level gauge, and the position of each calibration points is carried out record, then, according to the calibration points of labelling, it is manually entered the scale value of correspondence, and preserves.
In summary it can be seen, the present invention is according to the geometric properties of the cursor line of oil level gauge and oil level gauge dial plate half-tone information characteristic distributions, oil level gauge dial plate after carrying out color space conversion being carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of correspondence, preliminary filter background disturbs；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 using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filtering out the Local modulus maxima in Ha Er response diagram, further filter background disturbs；Owing to the set of Local modulus maxima including in cursor line some as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally according to start position, final position, slope, intercept and training stage of cursor line in advance in the calibration points of oil level gauge dial plate image tagged, obtain the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, has therefore reached 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 being converted to YCbCr color space by the color of described oil level gauge dial plate image from RGB color；
First computation subunit 222, is used for utilizing red color component value and luminance component to carry out Difference Calculation, obtains the colour-difference component of correspondence；
Sub-response unit 223, for described colour-difference component is carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of oil level gauge dial plate image.
For optimizing above-described embodiment further, sub-response unit 223 includes:
Second computation subunit 2231, for predetermined angle as step-length, rotates described colour-difference component, and once travels through the colour-difference partial image of each anglec of rotation, be 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 oil level gauge pointer of actual substation field may point to arbitrarily angled, in order to allow cursor line and Ha Er template matching, can be with predetermined angle as step-length, described colour-difference component is rotated, and the colour-difference partial image of each anglec of rotation is once traveled through, it is calculated the Ha Er response value of each pixel.
Choose subelement 2232, for choosing each described pixel maximum Ha Er response value under different rotary angle successively, and using the Ha Er response value of described maximum as the final Ha Er response value of this pixel；
Combination subelement 2233, for the final Ha Er response value of each described pixel being combined, forms 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 the Ha Er response value pixel more than described threshold value；
Judgment sub-unit 242, for successively in the local neighborhood of each described pixel, it is judged that whether the Ha Er response value that this pixel is corresponding is Local modulus maxima, if it is, perform storing sub-units 243；
Storing sub-units 243, for storing pixel and Local modulus maxima 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 get rid of 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, and 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 a kind of to calculate the mathematical model parameter of data according to one group of sample data set comprising abnormal data, obtains the algorithm of effective sample data.
The basic assumption of RANSAC algorithm is to comprise just data (inliers in sample, the data that can be described by model), also abnormal data (outliers, normal range is far, cannot adapt to the data of mathematical model in deviation) is comprised, i.e. containing noise in data set.These abnormal datas are likely due to the generations such as the calculating of the measurement of mistake, the hypothesis of mistake, mistake.RANSAC also assumes that simultaneously, given one group of correct data, there is the method that can calculate the model parameter meeting these data.
Revise subelement 252, for utilizing the remaining distance to the described initial straight Local modulus maxima less than described threshold value, be fitted described initial straight revising, obtain candidate's straight line；
Wherein, by judging that the Local modulus maxima distance to initial straight, whether less than threshold value, judges that this Local modulus maxima is whether in initial straight.
Set subelement 253, for, after terminating described Local modulus maxima traversal, by all candidate's straight line set, obtaining 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 value sum of pixel on every described straight line successively, and using described Ha Er response value sum as the confidence level of this straight line, and using straight line the highest for confidence level as the cursor line in oil level gauge dial plate image.
In summary it can be seen, the present invention is according to the geometric properties of the cursor line of oil level gauge and oil level gauge dial plate half-tone information characteristic distributions, oil level gauge dial plate after carrying out color space conversion being carried out Ha Er RESPONSE CALCULATION, obtains the Ha Er response diagram of correspondence, preliminary filter background disturbs；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 using Ha Er response value corresponding for the quantile that meets preset requirement as threshold value, filtering out the Local modulus maxima in Ha Er response diagram, further filter background disturbs；Owing to the set of Local modulus maxima including in cursor line some as the point of fitting a straight line, therefore, the present invention method by fitting a straight line, using straight line maximum for Ha Er response value sum as the cursor line in oil level gauge dial plate image, finally according to start position, final position, slope, intercept and training stage of cursor line in advance in the calibration points of oil level gauge dial plate image tagged, obtain the scale value that cursor line is pointed in oil level gauge dial plate image.It can be seen that the present invention is compared to existing technologies, it is not necessary to patrol officer goes collection in worksite data, has 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 embodiment of the method corresponding part, and here is omitted.
Finally, it can further be stated that, in this article, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation or sequentially that there is any this reality between these entities or operation.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
In this specification, each embodiment uses the mode gone forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, and 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 apparent from for those skilled in the art, and generic principles defined herein can realize without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (10)
1. the number reading method of an oil level gauge, it is characterised in that 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；
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 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.
Number reading method the most according to claim 1, it is characterised in that described to described oil level gauge table
Dish 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.
Number reading method the most according to claim 2, 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 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.
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 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. the frame of reference of an oil level gauge, 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 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；
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.
Frame of reference the most according to claim 6, it is characterised in that 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.
Frame of reference the most according to claim 7, it is characterised in that 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.
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 oil level gauge dial plate image.
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