CN107884164B - A kind of breaker spring method for testing performance of NCC-SAR algorithm - Google Patents
A kind of breaker spring method for testing performance of NCC-SAR algorithm Download PDFInfo
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- CN107884164B CN107884164B CN201710875570.9A CN201710875570A CN107884164B CN 107884164 B CN107884164 B CN 107884164B CN 201710875570 A CN201710875570 A CN 201710875570A CN 107884164 B CN107884164 B CN 107884164B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/20—Analysis of motion
- G06T7/223—Analysis of motion using block-matching
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/60—Analysis of geometric attributes
- G06T7/66—Analysis of geometric attributes of image moments or centre of gravity
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/70—Determining position or orientation of objects or cameras
- G06T7/73—Determining position or orientation of objects or cameras using feature-based methods
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2207/00—Indexing scheme for image analysis or image enhancement
- G06T2207/10—Image acquisition modality
- G06T2207/10016—Video; Image sequence
Abstract
The invention discloses a kind of breaker spring method for testing performance of NCC-SAR algorithm, are related to the detection technique field of high-tension apparatus.The breaker spring method for testing performance of the NCC-SAR algorithm, the motion conditions of spring during circuit-breaker switching on-off are captured by high speed camera, obtain thousands of frame image sequences, the kinetic characteristic that every circle spring is identified using NCC-SAR algorithm realizes the assessment to test spring performance in conjunction with breaker spring Performance Evaluation function；Detection method of the invention is non-contact detection method, without testing to spring dismantling and can carry out live detection to the running breaker spring in scene, solves the problems, such as that spring fatigue tester needs to disassemble spring；NCC-SAR algorithm of the invention is Adaptive Matching Algorithm, and not only accuracy of identification is high, anti-noise jamming ability is not influenced by gray value linear transformation by force, but also the speed of service is fast, improves spring performance on-line checking efficiency.
Description
Technical field
The invention belongs to the detection technique fields of high-tension apparatus, more particularly to one kind to be based on the adaptive area of normalized crosscorrelation
The open circuit of domain matching algorithm (Normalized Cross Correlation-Self Adjustment Region, NCC-SAR)
Device spring performance detection method.
Background technique
High-voltage circuitbreaker is the important equipment in electric system, protection and control to Guan Chong of the operational reliability to power grid
It wants.Operating mechanism is one of the core component for determining breaker performance, and wherein spring operating mechanism is using most common actuating
Mechanism, and its number of springs for being related to and type are more, thus in breaker spring reliability to equipment and electric system
Safe operation has great influence.With the extension of breaker Years Of Service, the spring in internal operating mechanism occur fatigue,
The problems such as aging, spring fatigue defect directly affect time and the speed of divide-shut brake, and the deterioration of spring performance will lead to breaker
Phenomena such as delay voltage or even miss operation, seriously affect the safe and stable operation of breaker.
Currently, spring fatigue tester is used to the detection of spring performance, and for the spring in breaker, due to spring
It has been be fixedly mounted that, the breaker for being put in fatigue tester again and test and being inconvenient, and disassemble on-line operation is disassembled to it
Spring has very big security risk, does not have feasibility.
Obtaining breaker spring performance based on computer vision technique is a kind of non-contact detection new method.Pass through high speed
The motion conditions of spring during cameras capture circuit-breaker switching on-off obtain thousands of frame image sequences, identify magnanimity high-resolution
The speed and precision of image object directly affect the practicability of method.Normalized crosscorrelation (NCC) matching algorithm accuracy of identification height,
Anti-noise jamming ability is influenced by gray value linear transformation by force, not, but its is computationally intensive, the speed of service is slow, therefore is guaranteeing to match
Under the premise of precision, the speed of service of optimization NCC algorithm is to realize to detect breaker spring performance based on computer vision technique
Key.Kinetic characteristic data of every circle spring during divide-shut brake are finally utilized, breaker spring Performance Evaluation letter is substituted into
Number realizes the assessment to spring performance.
Summary of the invention
In view of the deficiencies of the prior art, the present invention provides a kind of breaker spring method for testing performance of NCC-SAR algorithm,
According to the identification region of known consecutive frame target position adjust automatically algorithm during spring movement, to navigate to new knowledge
Other region optimizes NCC algorithm, improves recognition speed, is realized using the kinetic characteristic that identification obtains every circle spring to breaker bullet
The assessment of spring performance.
The present invention is to solve above-mentioned technical problem by the following technical solutions: a kind of open circuit of NCC-SAR algorithm
Device spring performance detection method captures the motion conditions of spring during circuit-breaker switching on-off by high speed camera, obtains thousands of
Frame image sequence identifies the kinetic characteristic of every circle spring using NCC-SAR algorithm, real in conjunction with breaker spring Performance Evaluation function
Now to the assessment of test spring performance, specifically includes the following steps:
(1) breaker spring performance detection dedicated unit is installed, regulating device parameter captures circuit-breaker switching on-off process
High speed image sequence, and start calculating analysis；
(2) start frame that spring movement is determined by image grayscale difference identification method, obtains the n frame after spring movement starts
Image sequence；
(3) every circle spring is numbered using transversal intersection method, there are m circle spring and as target to be identified；
(4) adjust automatically of identification region is carried out to the i-th (i ∈ m) circle spring, it is automatic in the position of previous frame according to target
The identification region of next frame is adjusted, until obtaining all positions of the circle spring in n frame image sequence；
(5) step (4) successively is carried out to other circle springs, obtains kinetic characteristic of the m target in n frame image；
(6) the kinetic characteristic data of m circle spring are substituted into breaker spring Performance Evaluation function, with calculated functional value
Realize the assessment to spring performance.
Further, the breaker spring performance detecting system in the step (1) includes LED light source, high speed camera, phase
Machine support, control host and the breaker spring performance detection software based on NCC-SAR algorithm being deployed on control host；
High speed camera is mounted on breaker spring overhead by camera support, camera support height and angle is adjusted, makes high speed camera
Camera lens allows spring to be located at image centre perpendicular to breaker spring；The focal length and frame per second for adjusting high speed camera, can
Enough number of image frames are captured in the case where guaranteeing image resolution ratio；Start the breaker spring based on NCC-SAR algorithm
Energy inspection software, captures high speed image sequence, starts the calculating analysis of above-mentioned steps (2) to (6).
Further, the image grayscale difference identification method in the step (2) is by all corresponding positions of adjacent two field pictures
The pixel gray value set is subtracted each other, and pixel number of the statistics difference greater than 20 is denoted as w, if w is more than given threshold (setting
The 2% of the total pixel number of image is threshold value), then assert that the frame is spring movement start frame, if n frame is obtained after starting in movement
Image.
Further, the transversal intersection method in the step (3) is to use conventional NCC using spring as a whole as target
Algorithm identifies spring position, then sets the straight line for running through spring from spring middle, which will be with every circle spring target
Have an intersection point, successively every circle spring be numbered as 1,2 from top to bottom with this intersection point ..., m, and in this, as m to
Identify target；Transversal intersection method can overcome the problems, such as that every circle spring is difficult to differentiate between identification because similar and causes.
Further, the step (4) is handed over first in first frame image using whole sub-picture as identification region in conjunction with transversal
Point method identifies position of the i-th circle spring in first frame image, and the zonule the p × q rectangle using centered on the position is as the
The identification region of one frame；Behind the target position of known -1 frame of kth (k-1 ∈ n, k ∈ n) and identification region, according to the fortune of target
Dynamic speed calculates region displacement X=λ v+c, and wherein λ is proportionality coefficient, and v is movement velocity, and c is constant, automatic using Δ X
After adjustment obtains the identification region of kth frame, the target image of kth frame is quickly and accurately searched in new identification region；With this
Analogize, frame is successively taken to carry out identification until obtaining all positions of the i-th circle spring in n frame image sequence.
Further, the target kinetic characteristic in the step (5) includes coordinates of targets and target velocity.
Further, the breaker spring Performance Evaluation function in the step (6) is
Wherein, coordinate of the i-th circle spring in kth frame isSpeed isI-th with two adjacent turn spring of i+1 the
Pitch of turn in k frame isThe foundation assessed the i-th circle spring performance is the circle spring in entire division
Pitch of turn and speed in lock n frame image sequence,For the matching similarity score value of the i-th circle spring target in kth frame, i=1,
2 ..., m；K=1,2 ..., n；
Finally obtain the assessed value s of all circle spring performances1, s2..., sm, it is compared with given threshold, learns bullet
The performance condition of spring and whether deterioration occurs.
Compared with prior art, the breaker spring method for testing performance of NCC-SAR algorithm provided by the present invention, passes through
High speed camera captures the motion conditions of spring during circuit-breaker switching on-off, obtains thousands of frame image sequences, is calculated using NCC-SAR
Method identifies the kinetic characteristic of every circle spring, realizes the assessment to test spring performance in conjunction with breaker spring Performance Evaluation function；
Detection method of the invention is non-contact detection method, can be running to scene disconnected without testing spring dismantling
Road device spring carries out live detection, solves the problems, such as that spring fatigue tester needs to disassemble spring；NCC-SAR of the invention is calculated
Method is Adaptive Matching Algorithm, and not only accuracy of identification is high, anti-noise jamming ability is not influenced by gray value linear transformation by force, and
And the speed of service is fast, improves spring performance on-line checking efficiency.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the breaker spring performance detection flow chart of NCC-SAR algorithm of the present invention；
Fig. 2 is breaker spring performance detection dedicated unit structural schematic diagram of the present invention；
Fig. 3 is the schematic diagram that transversal intersection method of the present invention carries out spring the number of turns number；
Fig. 4 is NCC-SAR algorithm of the present invention region adjust automatically schematic diagram；
Fig. 5 is the specific flow chart of the breaker spring method for testing performance of NCC-SAR algorithm of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, the technical solution in the present invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's every other embodiment obtained without creative labor,
It shall fall within the protection scope of the present invention.
As shown in Figure 1 and Figure 5, the breaker spring method for testing performance of NCC-SAR algorithm of the invention, passes through high speed phase
Machine captures the motion conditions of spring during circuit-breaker switching on-off, obtains thousands of frame image sequences, is identified using NCC-SAR algorithm
The kinetic characteristic of every circle spring realizes the assessment to test spring performance in conjunction with breaker spring Performance Evaluation function, with ZN65-
For 12 type high-voltage circuitbreaker separating brake processes, specific implementation the following steps are included:
(1) breaker spring performance detection dedicated unit is installed, as shown in Fig. 2, breaker spring performance detecting system packet
It includes LED light source, high speed camera, camera support, control host and is deployed in disconnected based on NCC-SAR algorithm on control host
Road device spring performance inspection software；High speed camera is mounted on breaker spring overhead by camera support, adjusts camera support
Height and angle, make high speed camera camera lens perpendicular to breaker spring, and spring is allowed to be located at image centre；Adjusting frame per second is
3000 frames/second, focusing keeps breaker spring clear；It is soft to start the breaker spring performance detection based on NCC-SAR algorithm
Part captures high speed image sequence, starts the calculating analysis of following step (2) to (6).
(2) start frame of spring movement is determined by image grayscale difference identification method, the resolution ratio of image in the present embodiment
It is 300 × 1000, then moving beginning threshold value is 6000 (the 2% of total pixel number is threshold value).The figure that high speed camera is captured
Pixel gray value as carrying out all corresponding positions of consecutive frame image is subtracted each other, the statistics gray scale difference value pixel greater than 20
Number, if more than 6000, then regards as spring movement and starts.N frame image is obtained after starting in movement.Breaker is before movement starts
There are bulk redundancy images, pick out movement start frame by image grayscale difference identification method, to reject redundant image, improve
The detection method speed of service.
(3) every circle spring is numbered using transversal intersection method, first using spring as a whole as target, uses routine
NCC algorithm identifies spring position, then does the straight line for running through spring from spring middle, which will be with every circle spring mesh
Mark has an intersection point, is successively from top to bottom numbered every circle spring for 1,2 with this intersection point ..., m, and in this, as m
Target to be identified, as shown in Figure 3.The bottom of spring is fixedly connected with pedestal in ZN65-12 type high-voltage circuitbreaker, top and movement
Connecting lever is connected, and the contractile motion of spring can drive the movement of connecting lever.Since every circle spring is all much like, image recognition algorithm energy
It identifies each circle spring, but they can not be distinguished, transversal intersection method can overcome every circle spring because similar and difficult
The problem of being caused with Division identification.
(4) adjust automatically that identification region is carried out to the i-th (i ∈ m) circle spring, with whole secondary figure first in first frame image
As being used as identification region, position of the i-th circle spring in first frame image is identified in conjunction with transversal intersection method, be with the position
Identification region of 100 × 200 zonule rectangles of the heart as first frame.Coordinate of the i-th circle spring target in -1 frame of kth beSpeed is(i=1,2 ..., m；K=1,2 ...,Region displacement is obtained by formula Δ X=λ v+cλ=0.2, c=3 are taken in the present embodiment.It is displaced using regionAdjust automatically identification region obtains
The identification region of kth frame, as shown in Figure 4.It utilizesAfter adjusting identification region, in new identification region quickly and accurately
Search the target image of kth frameAnd so on, successively frame is taken to be identified, until obtaining the i-th circle spring in n frame image
All positions in sequence.This NCC-SAR algorithm improves the search speed and precision of target from identification region.
(5) NCC-SAR algorithm is used to the m circle spring of spring, repeats (4) step, identify m target in n frame image
Kinetic characteristic, including movement position and speed, identification obtains coordinate of the m target in n frame image and is Speed is
(6) m target position coordinates in n frame image are utilized, pitch of turn of the two adjacent turn springs in certain frame is calculated, remember the
Pitch of turn of the two adjacent turn spring of i and i+1 in kth frame be(i=1,2 ..., m；K=1,2 ..., n；Definition), calculating pitch of turn of the m circle spring in n frame image with this isTo the i-th circle spring
The foundation that performance is assessed is pitch of turn and speed of the circle spring in entire divide-shut brake n frame image sequence, the i-th circle spring
Breaker spring Performance Evaluation function is
In formula,(i=1,2 ..., m；K=1,2 ..., n) be i-th circle spring target in kth frame matching similarity
Score value calculates the Performance Evaluation value of m circle spring with thus formula as s1, s2..., sm；siRepresent the performance of the i-th circle spring, siMore
It is big to indicate that spring fatigue problem is more serious, performance is poorer, siSmaller expression spring fatigue problem is lighter, performance is better.Finally by si
Compared with given threshold, then the assessment to breaker spring performance can be achieved.
Above disclosed is only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, can readily occur in variation or modification,
It is covered by the protection scope of the present invention.
Claims (6)
1. a kind of breaker spring method for testing performance of NCC-SAR algorithm, it is characterised in that the following steps are included:
(1) breaker spring performance detecting system is installed, regulating device parameter captures the high speed image of circuit-breaker switching on-off process
Sequence, and start calculating analysis；
(2) start frame that spring movement is determined by image grayscale difference identification method obtains the n frame image after spring movement starts
Sequence；
(3) every circle spring is numbered using transversal intersection method, there are m circle spring and as target to be identified；
(4) to the i-th circle spring carry out identification region adjust automatically, according to target previous frame position adjust automatically next frame
Identification region, until obtain all positions of the circle spring in n frame image sequence；
(5) step (4) successively is carried out to other circle springs, obtains kinetic characteristic of the m target in n frame image；
(6) the kinetic characteristic data of m circle spring are substituted into breaker spring Performance Evaluation function, with the realization of calculated functional value
Assessment to spring performance；
Transversal intersection method in the step (3) is to identify spring using conventional NCC algorithm using spring as a whole as target
Position, then the straight line for running through spring is set from spring middle, which will have an intersection point with every circle spring target, with
It is 1,2 that this intersection point, which is successively from top to bottom numbered every circle spring, ..., m, and in this, as m targets to be identified.
2. breaker spring method for testing performance as described in claim 1, which is characterized in that the open circuit in the step (1)
Device spring performance detection system includes LED light source, high speed camera, camera support, control host and is deployed on control host
The breaker spring performance detection software based on NCC-SAR algorithm；High speed camera is mounted on breaker by camera support
Spring overhead adjusts camera support height and angle, makes high speed camera camera lens perpendicular to breaker spring, and spring is allowed to be located at figure
As centre；Adjust the focal length and frame per second of high speed camera.
3. breaker spring method for testing performance as described in claim 1, which is characterized in that the image in the step (2)
Gray scale difference value identification method is to subtract each other the pixel gray value of all corresponding positions of adjacent two field pictures, and statistics difference is greater than
20 pixel number is denoted as w, if w is more than given threshold, assert that the frame is spring movement start frame, if movement is total after starting
Obtain n frame image.
4. breaker spring method for testing performance as described in claim 1, which is characterized in that the step (4) is first first
Using whole sub-picture as identification region in frame image, identify the i-th circle spring in first frame image in conjunction with transversal intersection method
Position, the identification region of the zonule p × q rectangle using centered on the position as first frame；When the target position of known -1 frame of kth
Set and identification region after, region displacement X=λ v+c is calculated according to the movement velocity of target, wherein λ is proportionality coefficient, and v is
Movement velocity, c are constant, after obtaining the identification region of kth frame using Δ X adjust automatically, in new identification region quickly, accurately
Ground searches the target image of kth frame；And so on, successively take frame to carry out identification until obtaining the i-th circle spring in n frame image sequence
All positions in column.
5. breaker spring method for testing performance as described in claim 1, which is characterized in that the target in the step (5)
Kinetic characteristic includes coordinates of targets and target velocity.
6. breaker spring method for testing performance as described in claim 1, which is characterized in that the open circuit in the step (6)
Device spring performance valuation functions are
Wherein, coordinate of the i-th circle spring in kth frame isSpeed isI-th with two adjacent turn spring of i+1 in kth frame
Pitch of turn beThe foundation assessed the i-th circle spring performance is the circle spring in entire divide-shut brake n frame figure
As the pitch of turn and speed in sequence,For the matching similarity score value of the i-th circle spring target in kth frame, i=1,2 ..., m；
K=1,2 ..., n；
Finally obtain the assessed value s of all circle spring performances1, s2..., sm, they are compared with given threshold, learns spring
Performance condition and whether deterioration occurs.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108921812B (en) * | 2018-05-11 | 2022-04-22 | 广西电网有限责任公司电力科学研究院 | Intelligent evaluation method for fatigue state of breaker spring based on image recognition |
| CN108846836B (en) * | 2018-05-31 | 2021-04-02 | 慕贝尔汽车部件（太仓）有限公司 | Spring detection equipment, spring detection method and device |
| CN109060285B (en) * | 2018-09-10 | 2020-03-17 | 西安交通大学 | Device and method for detecting dynamic vibration characteristic of spiral spring |
| CN111473962B (en) * | 2020-03-20 | 2022-08-16 | 广西电网有限责任公司电力科学研究院 | High-voltage circuit breaker operating spring performance evaluation method and system |
| CN111256980B (en) * | 2020-04-02 | 2022-03-22 | 广西电网有限责任公司电力科学研究院 | Circuit breaker energy storage spring performance detection method combining image and vibration signal |
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