CN104280670B - A kind of corona detection method based on day blind ultraviolet imager - Google Patents
A kind of corona detection method based on day blind ultraviolet imager Download PDFInfo
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- CN104280670B CN104280670B CN201410505956.7A CN201410505956A CN104280670B CN 104280670 B CN104280670 B CN 104280670B CN 201410505956 A CN201410505956 A CN 201410505956A CN 104280670 B CN104280670 B CN 104280670B
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Abstract
The invention discloses a kind of corona detection method based on day blind ultraviolet imager.The method includes：Using default standard ultraviolet source, to day, blind ultraviolet imager is demarcated；Gain control parameter is arranged according to calibrated nominal data, and according to gain control parameter, the gain of day blind ultraviolet imager is automatically adjusted；Using blind ultraviolet imager of described day, the corona discharge of target location is detected, obtain actually detected data；It is calculated the radiance of the corona of corresponding target location according to detection data.By using method provided by the present invention, detection by quantitative can be carried out to the radiance of corona to be detected.
Description
Technical field
The present invention relates to ultraviolet imagery detection technical field, particularly to a kind of inspection of corona based on day blind ultraviolet imager
Survey method.
Background technology
In the prior art, ultraviolet imagery detection technology is a kind of remote detection ac high-voltage line emerging in recent years
Road, the new technique of power transmission and transforming equipment exterior insulation state.This technology mainly passes through " day is blind " ultraviolet band (240～280nm)
Carry out the detection of corona discharge such that it is able to find to cause the abnormal equipment deficiency of electric field, be accurately positioned discharge position, observe and put
Electric situation, then the harm that corona discharge causes to electrical apparatus external insulation is judged by analysis.This technology has letter because of it
Single efficiently, visual pattern and the equipment that do not affect run, safe ready many advantages, such as, gradually obtained wide in power system
General promotion and application.
In this detection technique, ultraviolet detector and corresponding corona detection method are affect final detection result two
Key factor.In terms of ultraviolet detector, due to detected UV signal extremely faint it is therefore necessary to detected ultraviolet
Signal just can be detected after being strengthened.In the prior art, can carry out enhanced imaging detector mainly has electronics times
Increase charge-coupled image sensor (EMCCD) and strengthen two kinds of charge-coupled image sensor (ICCD).Wherein, EMCCD needs to freeze, therefore volume
All larger with power consumption, and price is also somewhat expensive.ICCD is by image intensifier and general visible CCD through optical fiber cone coupling
Become, its small volume, need not freeze and price is relatively inexpensive, therefore, ripe UV corona testing equipment all adopts in the market
ICCD is as ultraviolet detector.In this ICCD detector, it is to be carried in internal microchannel by controlling external voltage to adjust
The multiplication high pressure at plate (MCP) two ends, thus realize the regulation of gain.Wherein, approximate exponential relationship between control voltage and gain.
However, in UV corona testing equipment in the prior art, it is all manually regulation external electrical to the control of current gain
The mode of pressure is realizing, and cannot automatically gain be controlled, therefore, it is difficult to guarantee day blind ultraviolet ICCD is in specific increasing at any time
It is operated in linear zone when beneficial；Being additionally, since is that mode manually is controlled to gain, the therefore speed of gain-adjusted
Relatively slow, degree of regulation is also than relatively low.Based on the reason above-mentioned, in prior art, ripe UV corona detection method is all first
Obtain the ultraviolet image of corona to be detected by ultraviolet detector, then calculate the number of photons of target corona in ultraviolet image, and
According to number of photons number qualitative (rather than quantitative) analyze the size of discharge capacity.Therefore, corona detection of the prior art
Method all can only carry out qualitative detection to corona, thus can only the localization of faults position, and be not provided that the corona of trouble point
The concrete numerical value of produced radiance, therefore, it is difficult to detection by quantitative is carried out to the radiance of corona to be detected, thus difficult
To reflect the truth that power equipment damages exactly.
Content of the invention
In view of this, the present invention provides a kind of corona detection method based on day blind ultraviolet imager, such that it is able to treat
The radiance of detection corona carries out detection by quantitative.
Technical scheme is specifically realized in：
A kind of corona detection method based on day blind ultraviolet imager, the method includes：
A, using default standard ultraviolet source, to day, blind ultraviolet imager is demarcated；
B, gain control parameter is arranged according to calibrated nominal data, and blind ultraviolet becomes to day according to gain control parameter
Gain as instrument automatically adjusts；
C, using blind ultraviolet imager of described day, the corona discharge of target location is detected, obtain actually detected number
According to；
D, be calculated according to detection data corresponding target location corona radiance.
Preferably, described step A includes：
A1, pre-set a standard ultraviolet source；
A2, keep day blind ultraviolet imager gain constant, in the range of the gain-controlled voltage of current gain, select
N number of magnitude of voltage is as the control point voltage of current gain；
A3, for each control point voltage, the progressively radiance of adjustment criteria ultraviolet source, make day blind ultraviolet imagery
The brightness of the standard ultraviolet source in the ultraviolet image of instrument output by secretly changing to bright, up to saturation；
A4, the ultraviolet figure being exported according to the various radiances ultraviolet imager blind with corresponding day of standard ultraviolet source
Picture, the radiance of standard ultraviolet source setting up and storing each control point voltage is average with the target of corresponding ultraviolet image
Gray value, the relation curve of saturation.
Preferably, described step A4 includes：
Control point voltage at each, selection standard ultraviolet source is by dark to bright until corresponding to each stage in saturation history
M two field picture；
Extraction standard ultraviolet source in every two field picture, and calculate the target average gray value of this standard ultraviolet source, satisfy
With degree and corresponding atmospheric transmittance；
Set up according to result of calculation and store each control point voltage the radiance of standard ultraviolet source with corresponding
The target average gray value of ultraviolet image, the relation curve of saturation.
Preferably, described step B includes：
B1, each control point voltage described relation curve in, select a standard ultraviolet source radiance
The linear zone linear with the target average gray value of corresponding ultraviolet image；
B2, by the maximum P of the target average gray value of the ultraviolet image in selected linear zonemax, minima Pmin
With maximum saturation SmaxIt is set to gain control parameter；
B3, according to gain control parameter, the gain of day blind ultraviolet imager is automatically adjusted.
Preferably, described step B3 includes：
Calculate the target average gray value P in each output image of day blind ultraviolet imager in real timetWith saturation St；
Work as St＞ SmaxOr Pt＞ PmaxWhen, adjust the gain-controlled voltage of the image intensifier of day blind ultraviolet imager, reduce picture
The gain of booster, until St≤SmaxAnd Pt≤Pmax；
Work as Pt＜ PminWhen, adjust the gain-controlled voltage of the image intensifier of day blind ultraviolet imager, increase image intensifier
Gain, until Pt≥Pmin.
Preferably, described detection data includes：
The output image of day blind ultraviolet imager.
Preferably, still further comprising in described detection data：
Join with the gain-controlled voltage of the corresponding image intensifier of output image of blind ultraviolet imager of described day, atmospheric condition
Number and target range.
Preferably, described step D includes：
Gain-controlled voltage according to the image intensifier in detection data determines pass corresponding with described gain-controlled voltage
It is curve；
Determined by relation curve linear zone in choose m point on radiance and corresponding target average gray
Value；
Atmospheric transmittance according to corresponding to each selected point, target range, current gain, radiance and correspondence
Target average gray value, be calculated and each put corresponding systematic parameter；
Corresponding systematic parameter computing system mean parameter is put according to each；
Averagely grey according to described systematic parameter meansigma methodss, atmospheric transmittance, target range, current gain and corresponding target
Angle value, is calculated the radiance of the corona of target location.
Preferably, calculate the corona of each corresponding systematic parameter of point described and target location by formula as described below
Radiance：
Wherein, P is the target average gray value of the output image of ultraviolet imager, and k is blind ultraviolet imager with described day
Related systematic parameter, R is target range, and τ (R) is atmospheric transmittance, and G is the increasing of the image intensifier in day blind ultraviolet imager
Benefit, L is radiance.
As above visible, in the corona detection method based on day blind ultraviolet imager in the present invention, due to first using pre-
If standard ultraviolet source to day, blind ultraviolet imager is demarcated, then according to calibrated nominal data arrange gain control
Parameter, and according to gain control parameter, the gain of day blind ultraviolet imager is automatically adjusted；Then reuse described day blind
Ultraviolet imager detects to the corona discharge of target location, obtains actually detected data, and is calculated according to detection data
To the radiance of the corona of corresponding target location, such that it is able to realize carrying out quantitative inspection to the radiance of corona to be detected
Survey and be not only to carry out qualitative analyses.Further, since in the inventive solutions, can also be according to set gain
Control parameter automatically adjusts to the gain of day blind ultraviolet imager, such that it is able to demonstrate,prove the radiance of standard ultraviolet source with
The target average gray value of output image is operated in linear zone；Further, since in the inventive solutions, by linear zone
The target average gray value of ultraviolet image and maximum saturation as above-mentioned gain control parameter, thus greatly reducing figure
As the workload of data processing, improve gain-adjusted speed.
Brief description
Fig. 1 be the embodiment of the present invention in day blind ultraviolet imager structural representation；
Fig. 2 is the schematic flow sheet of the corona detection method based on day blind ultraviolet imager in the embodiment of the present invention.
Specific embodiment
For making the objects, technical solutions and advantages of the present invention become more apparent, develop simultaneously embodiment referring to the drawings, right
The present invention further describes.
Present embodiments provide a kind of corona detection method based on day blind ultraviolet imager.
Fig. 1 be the embodiment of the present invention in day blind ultraviolet imager structural representation.As shown in figure 1, described day blind purple
Outer imager (blind ultraviolet ICCD imaging system within the next few days) includes：Ultraviolet lens, ultraviolet filter, photocathode, microchannel plate, glimmering
Optical screen and charge coupled cell (CCD).
When using blind ultraviolet ICCD imaging system of above-mentioned day, target ultraviolet radioactive first passes around propagation in atmosphere and reaches system
The optical subsystem plane of incidence, be then passed through after the optical subsystem of the compositions such as ultraviolet lens and ultraviolet filter reaching image intensifying
Photocathode in device (including photocathode, microchannel plate and fluorescent screen), is then passed through photocathode in image intensifier
Fluorescent screen is reached, the visible radiation on last fluorescent screen is through optical fiber cone after the electron multiplication of opto-electronic conversion and microchannel plate
After pass on charge-coupled image sensor (CCD) target surface, through CCD imaging after export video signal.
When the parameter determination of each ingredient after installation and debugging in above-mentioned day blind ultraviolet ICCD imaging system, if target away from
With a distance from imaging system camera lens, (i.e. target range) is R, then the average gray value P of CCD output image is bright with the radiation of target
There is following relation in degree L：
Wherein, k is the systematic parameter related to blind ultraviolet ICCD imaging system of described day, when blind ultraviolet ICCD one-tenth of described day
After determining as system, this parameter k is fixed value, and τ (R) is atmospheric transmittance, and G is the gain of image intensifier.
From formula (1), after R determines, τ (R) can be by being calculated, and now formula (1) can be reduced to：
P=k1×G×L (2)
Wherein, k1It is and blind ultraviolet ICCD imaging system of described day, target range and the related parameter of atmospheric parameter, the same day
After blind ultraviolet ICCD imaging system, target range and atmospheric parameter determine, this parameter k1For fixed value.
Be can be seen that for the target under specific range and atmospheric condition by formula (2), when the gain G of image intensifier is
During certain fixed value, there is certain linear relationship in the average gray value P of the CCD output image and radiance L of target.And work as
When the radiance L of target is constant, the average gray value P of CCD output image and the gain G of image intensifier there is also certain line
Sexual intercourse.
Therefore, in order to quantitatively be calculated the radiance L of target by the average gray value P of CCD output image, first
First need to find a suitable image intensifier yield value G and target is detected.
So, in the inventive solutions it is proposed that using automatic gain control, to ensure day blind ultraviolet
ICCD imaging system is operated in linear zone in certain gain, is existed by the day blind ultraviolet ICCD imaging system of measured in advance simultaneously
Nominal data under different gains, is processed to the corona image of the corona of required detection, thus calculating target corona
Actual emanations brightness.
Fig. 2 is the schematic flow sheet of the corona detection method based on day blind ultraviolet imager in the embodiment of the present invention.As
Shown in Fig. 1, mainly being included based on the corona detection method of day blind ultraviolet imager in the embodiment of the present invention：.
Step 21, using default standard ultraviolet source, to day, blind ultraviolet imager is demarcated.
In order to realize the detection by quantitative of the radiance to corona to be detected it may first have to corona detection system (within the next few days
Blind ultraviolet imager) to be demarcated, its basic process is that the standard ultraviolet source for known radiance measures, thus
The radiance of Criterion ultraviolet source with day blind ultraviolet imager (for example, day blind ultraviolet ICCD imaging system) exported
Relation between the average gray value of ultraviolet image, saturation.
In the inventive solutions, above-mentioned steps 21 can be realized using various ways.Below will be with therein
As a example a kind of implementation, technical scheme is described in detail.
Preferably, in a particular embodiment of the present invention, described step 21 can include：
Step 211, pre-sets a standard ultraviolet source.
Step 212, keeps the gain G of day blind ultraviolet imager constant, in the scope of the gain-controlled voltage of current gain G
Interior, select N number of magnitude of voltage as the control point voltage of current gain.
For example, it is possible to determine the gain G of an image intensifier first in day blind ultraviolet imager, then keep this current
Gain G is constant, and for this current gain G, when described day, the scope of gain-controlled voltage of outside of blind ultraviolet imager is aV
During～bV, then can select N number of magnitude of voltage in interval [a, b] as the control point voltage of this current gain G.
In the inventive solutions, in the above-mentioned N number of control point voltage of actual selection, it is referred to day blind ultraviolet and becomes
Gain G as instrument selects N number of magnitude of voltage as control point voltage with the change curve of gain-controlled voltage.When above-mentioned N number of voltage
After value is selected, the gain G of the image intensifier of the magnitude of voltage selected corresponding to each is a fixed value.
Step 213, controls point voltage, the progressively radiance L of adjustment criteria ultraviolet source for each, makes day blind purple
The brightness of the target (i.e. standard ultraviolet source) in the ultraviolet image of outer imager output by secretly changing to bright, until satisfying
With.
Preferably, in a particular embodiment of the present invention, in this step, with synchronous recording and can store corresponding big
The information such as gas conditional parameter and target range.
Step 214, the purple of various radiances ultraviolet imager blind with the corresponding day output according to standard ultraviolet source
Outer image, sets up and stores the radiance of standard ultraviolet source of each control point voltage and the target of corresponding ultraviolet image
Average gray value, the relation curve of saturation.
Because the output image of day blind ultraviolet ICCD imaging system does not typically all have the background information of complexity, background gray scale is strong
Degree ratio is relatively low, and target (i.e. standard ultraviolet source) is higher with background contrasts, and therefore, the average gray value Pt of target determines whole
The average gray value P of width output image.Simultaneously as target typically only occupies view picture output figure in the ultraviolet image of actual measurement
, easily the oversaturated phenomenon in local, therefore also needs to saturation S to target in less region in picturetIt is analyzed.?
In technical scheme, can be by StMay be defined as gray value in object pixel and exceed threshold value PS(for example, representative value is
235) ratio of pixel count and target total pixel number.Thus, it can be known that described day blind ultraviolet imager output image change feelings
Condition can pass through average gray value PtWith saturation StTo embody, so, the various radiances according to standard ultraviolet source with corresponding
Day blind ultraviolet imager output ultraviolet image, you can set up each control point voltage standard ultraviolet source radiation bright
The relation curve of degree and the target average gray value of corresponding ultraviolet image, saturation.
In the inventive solutions, above-mentioned steps 214 can also be realized using various ways.Below will be with wherein
A kind of implementation as a example, technical scheme is described in detail.
For example, in presently preferred embodiments of the present invention, described step 214 can include：
Step 2141, controls point voltage at each, and selection standard ultraviolet source is by dark to bright until corresponding in saturation history
The M two field picture in each stage.
Preferably, in a particular embodiment of the present invention, the value of described M can preset according to practical situation.Example
If the value that can pre-set M is 5.
Step 2142, extraction standard ultraviolet source in every two field picture, and it is average to calculate the target of this standard ultraviolet source
Gray value Pt, saturation StWith corresponding atmospheric transmittance τ (R).
Step 2143, the radiation setting up and storing the standard ultraviolet source of each control point voltage according to result of calculation is bright
Spend the target average gray value P with corresponding ultraviolet imaget, saturation StRelation curve.
By above-mentioned step 2141～2143, you can set up and store the standard ultraviolet source of each control point voltage
Radiance and corresponding ultraviolet image target average gray value Pt, saturation StRelation curve.And
By above-mentioned step 211～214, you can using default standard ultraviolet source, to day, blind ultraviolet imager is carried out
Demarcate.
Step 22, arranges gain control parameter according to calibrated nominal data, and blind to day according to gain control parameter
The gain of ultraviolet imager automatically adjusts.
From above-mentioned described content, day blind ultraviolet imager output image situation of change can be put down by target
All gray value PtWith saturation StTo embody, therefore can be by the mesh of calculating and the output image of analysis day blind ultraviolet imager
Mark average gray value PtWith saturation StTo adjust the gain G of the image intensifier in day blind ultraviolet imager, thus ensureing that standard is purple
The radiance L of the outer light source and target average gray value P of output imagetIt is operated in linear zone, that is, in this linear zone, L and Pt
Linear.
In the inventive solutions, above-mentioned steps 22 can also be realized using various ways.Below will be with wherein
A kind of implementation as a example, technical scheme is described in detail.
For example, in presently preferred embodiments of the present invention, described step 22 can include：
Step 221, in the described relation curve that each controls point voltage, selects the radiation of a standard ultraviolet source
The brightness linear zone linear with the target average gray value of corresponding ultraviolet image.
In this step, a linear zone can be selected in the described relation curve that each controls point voltage,
In this linear zone, the radiance of standard ultraviolet source is linear with the target average gray value of corresponding ultraviolet image.
Step 222, by the maximum of the target average gray value of the ultraviolet image in selected linear zone, minima and
Maximum saturation is set to gain control parameter.
In this step, can be by the target average gray value in the linear zone of each control point voltage selected
Maximum Pmax, minima PminWith maximum saturation SmaxIt is set to gain control parameter, thereby may be ensured that the spoke of ultraviolet source
Penetrate the target average gray value P of brightness L and output imagetIt is operated in linear zone.
Step 223, automatically adjusts to the gain of day blind ultraviolet imager according to gain control parameter.
After being provided with gain control parameter, you can according to set gain control parameter, and located using corresponding
Reason circuit and the automatic tune of control circuit realization gain G of blind ultraviolet imager (blind ultraviolet ICCD imaging system within the next few days) to day
Section.
In the inventive solutions, above-mentioned steps 223 can also be realized using various ways.Below will be with wherein
A kind of implementation as a example, technical scheme is described in detail.
For example, in presently preferred embodiments of the present invention, described step 223 can include：
Step 2231, calculates the target average gray value P in each output image of day blind ultraviolet imager in real timetWith full
With degree St.
Step 2232, works as St＞ SmaxOr Pt＞ PmaxWhen, adjust the gain control electricity of the image intensifier of day blind ultraviolet imager
Pressure, reduces the gain of image intensifier, until St≤SmaxAnd Pt≤Pmax；
Work as Pt＜ PminWhen, adjust the gain-controlled voltage of the image intensifier of day blind ultraviolet imager, increase image intensifier
Gain, until Pt≥Pmin.
By above-mentioned step 2231～2232, you can realize the gain of day blind ultraviolet imager is automatically adjusted,
Thus ensureing the radiance L of the ultraviolet source and target average gray value P of output imagetIt is operated in linear zone.
Step 23, is detected to the corona discharge of target location using blind ultraviolet imager of described day, obtains actual inspection
Survey data.
When ultraviolet imager blind to day (blind ultraviolet ICCD imaging system within the next few days) is demarcated and is realized automatic growth control
Afterwards, you can using blind ultraviolet imager of described day, corona detection is carried out to the corona discharge of target location, obtain actually detected
Data.
Preferably, in a particular embodiment of the present invention, described detection data includes：The output figure of day blind ultraviolet imager
Picture.Would know that the target average gray value P of this output image by the output image of this day blind ultraviolet imagert, saturation
St.
In addition, detecting in the corona discharge to target location, real time record UV corona detection image is to obtain reality
While the detection data of border, can be with the outside gain-controlled voltage of the corresponding image intensifier of synchronous recording, atmospheric condition parameter
With information such as target ranges.It is therefore advantageous to, in a particular embodiment of the present invention, can also include in described detection data：
With the outside gain-controlled voltage of the corresponding image intensifier of output image of blind ultraviolet imager of described day, atmospheric condition parameter and
The information such as target range.
Step 24, is calculated the radiance of the corona of corresponding target location according to detection data.
Using blind ultraviolet imager of calibrated day the corona discharge of target location is carried out detection obtain actually detected
After data, you can obtained detection data is analyzed and calculates, to obtain the spoke of the corona of corresponding target location
Penetrate brightness.
In the inventive solutions, above-mentioned steps 24 can also be realized using various ways.Below will be with wherein
A kind of implementation as a example, technical scheme is described in detail.
For example, in presently preferred embodiments of the present invention, described step 24 can include：
Step 241, the gain-controlled voltage according to the image intensifier in detection data determines and described gain-controlled voltage
Corresponding relation curve.
Step 242, determined by relation curve linear zone in choose m point on radiance and corresponding target
Average gray value.
Preferably, in a particular embodiment of the present invention, the value of described m can pre-set.For example, it is possible to by m's
Value is set to 3, chooses 3 points in linear zone.
Step 243, the atmospheric transmittance according to corresponding to each selected point, target range, current gain, radiation are bright
Degree and corresponding target average gray value, are calculated and put corresponding systematic parameter with each.
Preferably, in a particular embodiment of the present invention, can be calculated corresponding with each point by above-mentioned formula (1)
Systematic parameter k.If the value of m is 3, three systematic parameters can be calculated：k1、k2And k3.
Step 244, puts corresponding systematic parameter computing system mean parameter according to each.
Step 245, according to described systematic parameter meansigma methodss, atmospheric transmittance, target range, current gain and corresponding mesh
Mark average gray value, is calculated the radiance of the corona of target location.
Preferably, in a particular embodiment of the present invention, when systematic parameter meansigma methodss, atmospheric transmittance, target range, when
When known to front gain and corresponding target average gray value, you can be calculated the corona of target location by above-mentioned formula (1)
Radiance L.
In summary, in the corona detection method based on day blind ultraviolet imager in the present invention, due to first using pre-
If standard ultraviolet source to day, blind ultraviolet imager is demarcated, then according to calibrated nominal data arrange gain control
Parameter, and according to gain control parameter, the gain of day blind ultraviolet imager is automatically adjusted；Then reuse described day blind
Ultraviolet imager detects to the corona discharge of target location, obtains actually detected data, and is calculated according to detection data
To the radiance of the corona of corresponding target location, such that it is able to realize carrying out quantitative inspection to the radiance of corona to be detected
Survey and be not only to carry out qualitative analyses.Further, since in the inventive solutions, can also be according to set gain
Control parameter automatically adjusts to the gain of day blind ultraviolet imager, such that it is able to demonstrate,prove the radiance of standard ultraviolet source with
The target average gray value of output image is operated in linear zone；Further, since in the inventive solutions, by linear zone
The target average gray value of ultraviolet image and maximum saturation as above-mentioned gain control parameter, thus greatly reducing figure
As the workload of data processing, improve gain-adjusted speed.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Within god and principle, any modification, equivalent substitution and improvement done etc., should be included within the scope of protection of the invention.
Claims (8)
1. a kind of corona detection method based on day blind ultraviolet imager is it is characterised in that the method includes：
Step A, using default standard ultraviolet source, to day, blind ultraviolet imager is demarcated；
Step B, gain control parameter is arranged according to calibrated nominal data, and blind ultraviolet becomes to day according to gain control parameter
Gain as instrument automatically adjusts；
Step C, using blind ultraviolet imager of described day, the corona discharge of target location is detected, obtain actually detected number
According to；
Step D, be calculated according to detection data corresponding target location corona radiance；
Wherein, described step A includes：
Step A1, pre-set a standard ultraviolet source；
Step A2, keep day blind ultraviolet imager gain constant, in the range of the gain-controlled voltage of current gain, select
N number of magnitude of voltage is as the control point voltage of current gain；
Step A3, for each control point voltage, the progressively radiance of adjustment criteria ultraviolet source, make day blind ultraviolet imagery
The brightness of the standard ultraviolet source in the ultraviolet image of instrument output by secretly changing to bright, up to saturation；
Step A4, the ultraviolet figure being exported according to the various radiances ultraviolet imager blind with corresponding day of standard ultraviolet source
Picture, the radiance of standard ultraviolet source setting up and storing each control point voltage is average with the target of corresponding ultraviolet image
Gray value, the relation curve of saturation.
2. method according to claim 1 is it is characterised in that described step A4 includes：
Control point voltage at each, selection standard ultraviolet source is by dark to bright until corresponding to the M frame in each stage in saturation history
Image；
Extraction standard ultraviolet source in every two field picture, and calculate the target average gray value of this standard ultraviolet source, saturation
With corresponding atmospheric transmittance；
Set up and store the radiance of standard ultraviolet source and the corresponding ultraviolet that each controls point voltage according to result of calculation
The target average gray value of image, the relation curve of saturation.
3. method according to claim 1 is it is characterised in that described step B includes：
Step B1, each control point voltage described relation curve in, select a standard ultraviolet source radiance
The linear zone linear with the target average gray value of corresponding ultraviolet image；
Step B2, by the maximum P of the target average gray value of the ultraviolet image in selected linear zonemax, minima Pmin
With maximum saturation SmaxIt is set to gain control parameter；
Step B3, according to gain control parameter, the gain of day blind ultraviolet imager is automatically adjusted.
4. method according to claim 3 is it is characterised in that described step B3 includes：
Calculate the target average gray value P in each output image of day blind ultraviolet imager in real timetWith saturation St；
Work as St＞ SmaxOr Pt＞ PmaxWhen, adjust the gain-controlled voltage of the image intensifier of day blind ultraviolet imager, reduce image intensifying
The gain of device, until St≤SmaxAnd Pt≤Pmax；
Work as Pt＜ PminWhen, adjust the gain-controlled voltage of the image intensifier of day blind ultraviolet imager, increase the gain of image intensifier,
Until Pt≥Pmin.
5. method according to claim 1 is it is characterised in that described detection data includes：
The output image of day blind ultraviolet imager.
6. method according to claim 5 is it is characterised in that still further comprise in described detection data：
With the gain-controlled voltage of the corresponding image intensifier of output image of blind ultraviolet imager of described day, atmospheric condition parameter and
Target range.
7. method according to claim 1 is it is characterised in that described step D includes：
Gain-controlled voltage according to the image intensifier in detection data determines that relation corresponding with described gain-controlled voltage is bent
Line；
Determined by relation curve linear zone in choose m point on radiance and corresponding target average gray value；
Atmospheric transmittance according to corresponding to each selected point, target range, current gain, radiance and corresponding mesh
Mark average gray value, is calculated and puts corresponding systematic parameter with each；
Corresponding systematic parameter computing system mean parameter is put according to each；
According to described systematic parameter meansigma methodss, atmospheric transmittance, target range, current gain and corresponding target average gray
Value, is calculated the radiance of the corona of target location.
8. method according to claim 7 corresponds to it is characterised in that calculating each point described by formula as described below
Systematic parameter and target location corona radiance：
Wherein, P is the target average gray value of the output image of ultraviolet imager, and k is related to blind ultraviolet imager of described day
Systematic parameter, R be target range, τ (R) be atmospheric transmittance, G is the gain of the image intensifier in day blind ultraviolet imager, L
For radiance.
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| CN105004972B (en) * | 2015-06-25 | 2017-11-28 | 华北电力大学（保定） | Porcelain insulator Condition assessment of insulation method based on day blind ultraviolet imagery characteristics of image |
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