CN104297176B - The devices, systems and methods of round-the-clock monitoring the Changjiang river mountain area section visibility - Google Patents
The devices, systems and methods of round-the-clock monitoring the Changjiang river mountain area section visibility Download PDFInfo
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Abstract
The present invention provides the system of round-the-clock monitoring the Changjiang river mountain area section visibility, including mode switch element, for the judged result according to control circuit and the switching daytime of time point at that time or night；The demarcation unit of image visibility contrast standard；Image data processing unit；Target area recognition unit；Target area luminance contrast characteristics extraction unit；Visibility computing unit；Evaluation unit.The present invention is capable of round-the-clock real-time monitoring visibility, two kinds of monitoring modes for daytime and night can automatically switch, and can be directly installed on light tender, the monitoring to mist feelings is more timely, the navigation condition of ship in navigation channel, the data of measurement more accurately has more practical significance；The cost of complete equipment is relatively low, can improve the density of erection, increases the scope of monitoring, obtains more visibility informations, so that navigation channel mist feelings is monitored closer to fact.
Description
Technical field
The invention belongs to monitoring field is and in particular to a kind of system of round-the-clock monitoring the Changjiang river mountain area section visibility and side
Method.
Background technology
In the Changjiang river mountainous waterway, by water body and extreme terrain environmental effect, frequent fogged-in on river surface.It is most commonly that
Radiation fog, what harm was maximum is a mist, also a small amount of advection fog.Group's mist monomer is smaller, and general range is tens of rice to hundreds of
Rice, the outer sight line of group's mist is good, and dim a piece of in group's mist, visibility is extremely low.Due to a mist local, sudden strong, crewman can be made
It is caught unprepared, easily causes major traffic accidents, boat is caused seriously threaten.Therefore, in the Changjiang river mountain area section, laying is higher
The visibility meter of density is most important for navigation safety.
The visibility meter using at present has transmission-type visibility meter, scatter-type visibility meter, image pick-up type visibility meter and swashs
Optical radar.According to the Changjiang river mountainous fog feelings feature, and ship's navigation feature in the Changjiang river is it is desirable to visibility meter is directed to below 1Km's
Low visibility monitoring has degree of precision.And for the ease of installing it is desirable to the small volume of instrument, low-power consumption along the river long, and
And radiationless pollution.In addition, in order to ensure high density networking it is desirable to cheap.Former according to mentioned above principle and visibility meter
Reason, the pluses and minuses analyzing various types of visibility meteies are it is adaptable to mountainous waterway special visibility instrument type in the Changjiang river has：Single
Light path forward scattering visibility meter, image pick-up type visibility meter, back scattering visibility meter.
Visibility is measured using video camera, as automatic monitoring method, the observation of human eye can be replaced, by meteorological observation people
Member frees from the fatigue of long-time observation, and can avoid the impact of subjective factorss.With respect to other automatic detections
Instrument, such as transmission-type visibility meter, scatter-type visibility meter, image pick-up type visibility meter Observation principle similar to human eye mode,
Record is comprehensive visibility, more practical significance.Because not requiring high accuracy can meet measurement requirement, it is possible to use low one-tenth
This common day and night type video camera.In addition, data handling equipment can adopt existing device, further reduces cost.Cause
This, with respect to other schemes, low cost is one of outstanding feature of the program, high density particularly can be greatly lowered and set up
Cost.To sum up, how to provide real-time visibility information using the type video camera for the Changjiang river traffic department, be this invention institute
Problem to be solved.
Content of the invention
The technical problem to be solved in the present invention is：There is provided a kind of round-the-clock monitoring the Changjiang river mountain area section visibility system and
Method, using inexpensive common day and night type video camera, realizes round-the-clock measurement.
The present invention by solving the technical scheme taken of above-mentioned technical problem is：A kind of round-the-clock monitoring the Changjiang river mountain area section
The device of visibility it is characterised in that：It includes the day and night type video camera being oppositely arranged on light tender and Target Board, day
The industrial computer that the image transmitting comprising Target Board collecting is carried by night dual-purpose video camera to light tender, Temperature Humidity Sensor
Gather real-time temperature and humidity information and be sent to described industrial computer；
Described day and night type video camera carries infrared light supply, is provided with moveable infrared filter between camera lens and CCD
With full spectrum light glass, being movable into and out by camera control circuit control of infrared filter and full spectrum light glass
System, camera control circuit judges it is daytime or night by the data that light sensor collects, thus accordingly control moving
Enter full spectrum light glass or infrared filter and close or open infrared light supply, control circuit will determine that result is sent out simultaneously
Deliver to the industrial computer that light tender carries；
Industrial computer was carried out data processing, is calculated visibility using corresponding standard according to daytime or night.
By said apparatus, described Target Board is made up of black-and-white two color.
By said apparatus, between described light sensor and camera control circuit, it is provided with delay circuit.
By said apparatus, the described outfan of industrial computer is connected with display screen and/or alarm device.
By said apparatus, described industrial computer is communicated with the Surveillance center of the Changjiang river traffic department.
The long rivers and mountains of round-the-clock monitoring that a kind of device using above-mentioned round-the-clock monitoring the Changjiang river mountain area section visibility is realized
The system of area section visibility it is characterised in that：It includes：
Mode switch element, for the judged result according to control circuit and the switching daytime of time point at that time or night；
The demarcation unit of image visibility contrast standard, for for night and both of which on daytime, respectively by visibility
The luminance contrast of the target area that coupling day and night type video camera records, obtains both functions using the method for matching and closes
System；Wherein adopt under day mode and adopt infrared ray under visible ray, night mode；
Image data processing unit, for saving as the figure of set form by the image of day and night type camera acquisition
Piece, and serial number；
Target area recognition unit, for by the picture of the set form handled well, using image segmentation, obtains target
Region in picture for the plate, as target area, calculates the pixel of the target area coordinate in entire image pixel coordinate system
Scope；
Target area luminance contrast characteristics extraction unit, for being converted into ash by the brightness value of target area color separation block
Angle value, and ask for the meansigma methodss of each color lump gray value respectively, finally give the luminance contrast of target area；
Visibility computing unit, for substituting into image visibility pair by the luminance contrast of the current target area obtaining
Ratio, in standard, is calculated current visibility value V；
Evaluation unit, for utilizing D-S evidence theory, by the visibility recording, current ambient temperature and current wet
Degree, respectively as evidence, is calculated the maximum visibility distributed area of degree of belief.
By said system, also include alarm unit, the maximum area of the visibility credibility for obtaining according to evaluation unit
Between, according to the mist feelings criteria for classifying of Yangtze River waterway department formulation, reported to the police according to following standard：
Work as V>When 1000, do not report to the police；
When 1000>V>When 500, do middle mist and report to the police；
Work as V<When 500, do dense fog and report to the police.
By said system, also include visibility recording unit, for depositing the visibility obtaining value according to the numbering of picture
Enter in the corresponding row of corresponding database table.
The long rivers and mountains of round-the-clock monitoring that a kind of device using above-mentioned round-the-clock monitoring the Changjiang river mountain area section visibility is realized
The method of area section visibility it is characterised in that：It comprises the following steps：
S1, the judged result according to control circuit and the switching daytime of time point at that time or night；
S2, the image of day and night type camera acquisition is saved as the picture of set form, and serial number；
S3, by the picture of the set form handled well, using image segmentation, obtain region in picture for the Target Board,
As target area, calculate the pixel of the target area coordinate range in entire image pixel coordinate system；
S4, for the brightness value of target area color separation block is converted into gray value, and ask for each color lump gray value respectively
Meansigma methodss, finally give the luminance contrast of target area；
S5, the luminance contrast of the current target area obtaining is substituted in image visibility contrast standard, calculate
To current visibility value V；
For night and both of which on daytime, the target area recording visibility coupling day and night type video camera respectively
Luminance contrast, obtain both functional relationships using the method for matching, constitute described image visibility contrast standard；Its
Adopt under middle day mode and adopt infrared ray under visible ray, night mode；
S6, utilize D-S evidence theory, using the visibility recording, current ambient temperature and current humidity as
Evidence, is calculated the maximum visibility distributed area of degree of belief.
As stated above, the maximum interval of the visibility credibility that also include S7, obtains according to evaluation unit, according to the Changjiang river
The mist feelings criteria for classifying that navigation channel department formulates, is reported to the police according to following standard：
Work as V>When 1000, do not report to the police；
When 1000>V>When 500, do middle mist and report to the police；
Work as V<When 500, do dense fog and report to the police.
As stated above, also include S8, in daytime mode, periodically open infrared light supply, maintain a period of time again
Close infrared light supply, this time is preset value.
Beneficial effects of the present invention are：
1st, reequiped using inexpensive day and night type video camera, thus automatic measurement visibility, people can be replaced
The observation of eye, meteorological observation personnel is freed from the fatigue of long-time observation, and can avoid the shadow of subjective factorss
Ring；Using apparatus of the present invention, system and method, it is capable of round-the-clock real-time monitoring visibility, for daytime and night
Two kinds of monitoring modes can automatically switch, and can be directly installed on light tender, and the monitoring to mist feelings is more timely, in navigation channel
The navigation condition of ship, the data of measurement more accurately has more practical significance；Saved further using the industrial computer that light tender carries
Cost；The cost of complete equipment is relatively low, can improve the density of erection, increases the scope of monitoring, obtains more visibility letters
Breath, makes navigation channel mist feelings monitor closer to fact.
2nd, utilize the Target Board of black and white, more convenient when processing image.
3rd, pass through to increase the unit reported to the police or show or store so that the system is preferably applied.
4th, pass through to increase delay circuit, it can be avoided that the frequent shifting in filter lenss at dusk or during the change fluctuation of environment light and shade
Dynamic, infrared light supply frequently switch on, improve equipment life.
5th, in daytime mode, by periodically opening infrared light supply, using ultrared heat effect, increase to camera lens
Temperature, allows water smoke evaporation on camera lens, thus avoiding camera lens to have water smoke, interference to shoot precision.
Brief description
Fig. 1 is the scheme of installation front view of video camera and object.
Fig. 2 is the scheme of installation top view of video camera and object.
Fig. 3 is the target plate pattern of one embodiment of the invention.
Fig. 4 is setting schematic diagram in video camera on daytime.
Fig. 5 is setting schematic diagram in night video camera.
Fig. 6 is to be embodied as flow chart.
Fig. 7 is visibility calculation flow chart.
Fig. 8 is evaluation unit flow chart.
Specific embodiment
With reference to instantiation, the present invention will be further described.
The present invention provide a kind of round-the-clock monitoring the Changjiang river mountain area section visibility device as depicted in figs. 1 and 2, including
The day and night type video camera being oppositely arranged on light tender and Target Board（In the present embodiment, Target Board is made up of black-and-white two color,
Wherein outer ring is black, and center is white, as shown in Figure 3）, the image of the Target Board collecting passes by day and night type video camera
It is defeated by the industrial computer that light tender carries；Described day and night type video camera carries infrared light supply, is provided with removable between camera lens and CCD
Dynamic infrared filter and full spectrum light glass, as shown in Figure 4 and Figure 5, the shifting of infrared filter and full spectrum light glass
Enter and be shifted out through camera control circuit to control, the data judgement that camera control circuit is collected by light sensor is
Daytime or night, thus accordingly control and moving into full spectrum light glass or infrared filter and close or open infrared light
Source, simultaneously control circuit will determine that result sends the industrial computer carrying to light tender；Temperature Humidity Sensor gathers real-time temperature
It is sent to described industrial computer with humidity information；Industrial computer according to daytime or night using corresponding standard carry out data processing,
Calculate visibility.
The video camera using carries infrared light supply, has an infrared filter, filter visible between camera lens and CCD
Light and ultraviolet, also a full spectrum light glass, has pasted cutoff filter, filters infrared ray and avoids colour cast, more connects
The observation of person of modern times's eye.Automatically remove infrared filter during daytime, move into full spectrum light glass, allow infrared filter to return in the evening
Between CCD and camera lens, remove full spectrum light glass, and open infrared light supply.Here full spectrum light glass, infrared filtering
The movement of mirror, the opening and closing of infrared light supply are all to rely on the light sensor experiencing ambient light（It is usually photoconductive resistance, may also be employed
Other light-sensitive devices）Break-make controlling.
Preferably, in order to avoid in frequently the moving of filter lenss, infrared light supply at dusk or during the change fluctuation of environment light and shade
Frequently switch on, a delay circuit can be set between light sensor and camera control circuit.
The outfan of described industrial computer is connected with display screen and/or alarm device, industrial computer and the Changjiang river traffic department
Surveillance center communicates.
The long rivers and mountains of round-the-clock monitoring that a kind of device using above-mentioned round-the-clock monitoring the Changjiang river mountain area section visibility is realized
The system of area section visibility, including：
Mode switch element, for the judged result according to control circuit and the switching daytime of time point at that time or night.
The demarcation unit of image visibility contrast standard, for for night and both of which on daytime, respectively by visibility
The luminance contrast of the target area that coupling day and night type video camera records, obtains both functions using the method for matching and closes
System；Wherein adopt under day mode and adopt infrared ray under visible ray, night mode；This demarcation unit simply can be shown in formulation image
Use during degree contrast standard, once completing demarcating of task, this unit, with regard to break-off, belongs to the premise of systems soft ware work
Condition.
Image data processing unit, for saving as the figure of set form by the image of day and night type camera acquisition
Piece, and serial number；There is provided picture for subsequent treatment.
Target area recognition unit, for by the picture of the set form handled well, using image segmentation, obtains target
Region in picture for the plate, as target area, calculates the pixel of the target area coordinate in entire image pixel coordinate system
Scope.
Target area luminance contrast characteristics extraction unit, for being converted into ash by the brightness value of target area color separation block
Angle value, and ask for the meansigma methodss of each color lump gray value respectively, finally give the luminance contrast of target area.
Visibility computing unit, for substituting into image visibility pair by the luminance contrast of the current target area obtaining
Ratio, in standard, is calculated current visibility value V；
Evaluation unit, for utilizing D-S evidence theory, by the visibility recording, current ambient temperature and current wet
Degree, respectively as evidence, is calculated the maximum visibility distributed area of degree of belief.
Preferably, also include alarm unit, the maximum interval of the visibility credibility for being obtained according to evaluation unit, root
The mist feelings criteria for classifying formulated according to Yangtze River waterway department, is reported to the police according to following standard：
Work as V>When 1000, do not report to the police；
When 1000>V>When 500, do middle mist and report to the police；
Work as V<When 500, do dense fog and report to the police.
Preferably, the maximum visibility distributed area of degree of belief is sent to the Surveillance center of the Changjiang river traffic department, is connecing
Receive alarm unit alarm signal when, alarm signal is sent to Surveillance center；In addition monitoring center software can also be received
The date and time value passing down, carries out date and time calibration to system, and feedback calibration information, realizes synchronous.
Preferably, also include visibility recording unit, right for being stored in the visibility obtaining value according to the numbering of picture
In the corresponding row of the database table answered, can also be according to the regulation of program, periodic cleaning data base, saves internal memory.
The long rivers and mountains of round-the-clock monitoring that a kind of device using above-mentioned round-the-clock monitoring the Changjiang river mountain area section visibility is realized
The method of area section visibility, comprises the following steps：
S1, the judged result according to control circuit and the switching daytime of time point at that time or night；
S2, the image of day and night type camera acquisition is saved as the picture of set form, and serial number；
S3, by the picture of the set form handled well, using image segmentation, obtain region in picture for the Target Board,
As target area, calculate the pixel of the target area coordinate range in entire image pixel coordinate system；
S4, for the brightness value of target area color separation block is converted into gray value, and ask for each color lump gray value respectively
Meansigma methodss, finally give the luminance contrast of target area；In the present embodiment：
(1),
(2),
The gray value of any point pixel of Gi (x, y) representative picture target area black ring part in formula (1), N1 represents
The sum of this black ring part pixel, f1 (x, y) represents the average gray value of this black ring part；Gi (x, y) in formula (2)
The gray value of some pixels of representative picture target area center white part, N2 represents the total of this center white partial pixel
Number, f2 (x, y) represents the average gray value of this center white part；So luminance contrast c can be obtained by equation below：
(3)；
S5, the luminance contrast of the current target area obtaining is substituted in image visibility contrast standard, calculate
To current visibility value V.
For night and both of which on daytime, the target area recording visibility coupling day and night type video camera respectively
Luminance contrast, obtain both functional relationships using the method for matching, constitute described image visibility contrast standard；Its
Adopt under middle day mode and adopt infrared ray under visible ray, night mode.
S6, utilize D-S evidence theory, using the visibility recording, current ambient temperature and current humidity as
Evidence, is calculated the maximum visibility distributed area of degree of belief.
The data of visibility value, humidity and temperature sensor that video camera is recorded is merged, and jointly supports same
Conclusion, in this unit, uncertainty knowledge is expressed as follows：
If E1 then H={h1,h2,h3,h4,h5}, CF={a1,a2,a3,a4,a5}；
If E2 then
If E3 then
（1）Condition premised on E, i.e. evidence, E1 represents current visibility value, and E2 represents current humidity value, and E3 represents current
Temperature value；
（2）H is conclusion is also identification space, H={ h1, h2, h3, h4, h5 }, and h1, h2, h3, h4, h5 are the bases of this subset
This element；Wherein h1={ 1000<V<2000}, h2={500<V<1000}, h3={200<V<500}, h4={50<V<200},
h5={V<50}；
（3）CF is CF, is represented with aggregate form, in every knowledge ai, bi or ci respectively with hi（i=1,
2,3,4,5）Corresponding it is indicated that the credibility of hi；
Wherein ∑ ci≤1, ci >=0, i=1,2,3,4,5；
Rule of thumb space understands probability distribution function m1, m2, m3 of E1, E2 and E3, is demonstrate,proved using D-S evidence theory
According to compound, obtain the probability-distribution function m of compound evidence, obtain m (h1), m (h2), m (h3), m (h4), m (h5), m afterwards
(H) the lower limit Bel (h1) of interval trusting degree, Bel (h2), Bel (h3), Bel (h4), Bel (h5) can, be obtained further,
And upper limit Pl (h1) of interval trusting degree, Pl (h2), Pl (h3), Pl (h4), Pl (h5), so can be obtained by visibility
Interval in the trusting degrees of five interval distributions, through comparing, can degree of establishing trust maximum interval, by it as alarm unit
Input interval, be used for judging whether to reporting to the police.
Preferably, the maximum interval of the visibility credibility that also include S7, obtains according to evaluation unit, according to Yangtze River waterway
The mist feelings criteria for classifying that department formulates, is reported to the police according to following standard：
Work as V>When 1000, do not report to the police；
When 1000>V>When 500, do middle mist and report to the police；
Work as V<When 500, do dense fog and report to the police.
Preferably, also include S8, in daytime mode, periodically open infrared light supply, maintain a period of time to turn off
Infrared light supply, this time is preset value.
Preferably, the current visibility value asked in certain time can be averaged process, then by average visibility
It is worth the evidence E1 as evaluation unit, thus improving the reliability of evaluation.
When being embodied as, as shown in fig. 6, comprising the following steps：
Step 1：System record current time T0；
Step 2：To system input image data and generate picture, and preserve the picture of generation, be picture number；
Step 3：Luminance contrast and visibility will be calculated；
Step 4：Record current time T1；
Step 5：Judge whether T1-T0 is more than 60s, if then execution step 6, otherwise execution step 2；
Step 6：Visibility value in one minute is done average treatment, the visibility obtaining and preserving in a minute is average
Value；
Step 7：Evaluate；
Step 8：Report to the police；
Step 9：Execution communication unit, if there are warning, preserves alarm logging, returns to step 1.
Described step 3 is as shown in fig. 7, comprises following steps：
Step 31：Input picture；
Step 32：System carries out the identification of target area to the picture of input, because the position phase of video camera and Target Board
To constant, so the picture position of Target Board position in the picture is constant it is only necessary to identify once；
Step 33：Calculate the luminance contrast of the target area of picture；
Step 34：Make-and-break signal according to photoconductive resistance determines adopted which image visibility contrast standard, if
State 1, execution step 35, otherwise execution step 36；
Step 35：The luminance contrast of calculated target area is substituted into day images visibility contrast standard, meter
Calculate daytime visibility；
Step 36：The luminance contrast of calculated target area is substituted into evening images visibility contrast standard, meter
Calculate night visibility；
Step 37：Preserve visibility value.
Described step 7 is as shown in figure 8, comprise the following steps：
Step 71：Input average energy is shown in angle value, current temperature and humidity data；
Step 72：Average energy is shown in angle value, current temperature and humidity data, as evidence, using experience space, obtain
The probability distribution function of evidence；
Step 73：Using the evidence Combined Processing of evidence theory, merge camera data, temperature sensor and humidity sensor
Device data, calculates the interval degree of belief of each visibility；
Step 74：Output has the interval of maximum trust；
Step 75：Output result is fed back to experience space.
Above example is merely to illustrate design philosophy and the feature of the present invention, its object is to make technology in the art
Personnel will appreciate that present disclosure and implement according to this, protection scope of the present invention is not limited to above-described embodiment.So, all according to
The equivalent variations made according to disclosed principle, mentality of designing or modification, all within protection scope of the present invention.
Claims (10)
1. a kind of round-the-clock monitoring the Changjiang river mountain area section visibility device it is characterised in that：It is included on light tender relatively
The day and night type video camera of setting and Target Board, day and night type video camera is by the image transmitting comprising Target Board collecting
The industrial computer carrying to light tender, Temperature Humidity Sensor gathers real-time temperature and humidity information and is sent to described industrial computer；
Described day and night type video camera carries infrared light supply, is provided with moveable infrared filter and complete between camera lens and CCD
Spectrum optical glass, described full spectrum light glass posts cutoff filter, infrared filter and full spectrum light glass
Being movable into and out of glass is controlled by camera control circuit, the data that camera control circuit is collected by light sensor
Judgement is daytime or night, thus accordingly control and moving into full spectrum light glass or infrared filter and close or open
Infrared light supply, simultaneously control circuit will determine that result sends the industrial computer carrying to light tender；
Industrial computer was carried out data processing, is calculated visibility using corresponding standard according to daytime or night；
Described Target Board is made up of black-and-white two color.
2. round-the-clock monitoring the Changjiang river according to claim 1 mountain area section visibility device it is characterised in that：Described
It is provided with delay circuit between light sensor and camera control circuit.
3. round-the-clock monitoring the Changjiang river according to claim 1 mountain area section visibility device it is characterised in that：Described
The outfan of industrial computer is connected with display screen and/or alarm device.
4. round-the-clock monitoring the Changjiang river according to claim 1 mountain area section visibility device it is characterised in that：Described
Industrial computer is communicated with the Surveillance center of the Changjiang river traffic department.
5. the round-the-clock prison that a kind of device of the round-the-clock monitoring the Changjiang river mountain area section visibility described in utilization claim 1 is realized
Survey the system of the Changjiang river mountain area section visibility it is characterised in that：It includes：
Mode switch element, for the judged result according to control circuit and the switching daytime of time point at that time or night；
The demarcation unit of image visibility contrast standard, for for night and both of which on daytime, mating visibility respectively
The luminance contrast of the target area that day and night type video camera records, obtains both functional relationships using the method for matching；
Wherein adopt under day mode and adopt infrared ray under visible ray, night mode；
Image data processing unit, for the image of day and night type camera acquisition being saved as the picture of set form, and
Serial number；
Target area recognition unit, for by the picture of the set form handled well, using image segmentation, obtains Target Board and exists
Region in picture, as target area, calculates the pixel of the target area coordinate range in entire image pixel coordinate system；
Target area luminance contrast characteristics extraction unit, for being converted into gray scale by the brightness value of target area color separation block
Value, and ask for the meansigma methodss of each color lump gray value respectively, finally give the luminance contrast of target area；
Visibility computing unit, for substituting into image visibility contrast mark by the luminance contrast of the current target area obtaining
In standard, it is calculated current visibility value V；
Evaluation unit, for utilizing D-S evidence theory, the visibility recording, current ambient temperature and current humidity is divided
Not as evidence, it is calculated the maximum visibility distributed area of degree of belief.
6. round-the-clock monitoring the Changjiang river according to claim 5 mountain area section visibility system it is characterised in that：Also include
Alarm unit, the maximum interval of the visibility credibility for being obtained according to evaluation unit, formulated according to Yangtze River waterway department
The mist feelings criteria for classifying, is reported to the police according to following standard：
Work as V>When 1000, do not report to the police；
When 1000>V>When 500, do middle mist and report to the police；
Work as V<When 500, do dense fog and report to the police.
7. round-the-clock monitoring the Changjiang river according to claim 5 mountain area section visibility system it is characterised in that：Also include
Visibility recording unit, for being stored in the corresponding row of corresponding database table by the visibility obtaining value according to the numbering of picture
In.
8. the round-the-clock prison that a kind of device of the round-the-clock monitoring the Changjiang river mountain area section visibility described in utilization claim 1 is realized
Survey the method for the Changjiang river mountain area section visibility it is characterised in that：It comprises the following steps：
S1, the judged result according to control circuit and the switching daytime of time point at that time or night；
S2, the image of day and night type camera acquisition is saved as the picture of set form, and serial number；
S3, by the picture of the set form handled well, using image segmentation, obtain region in picture for the Target Board, as
Target area, calculates the coordinate range in entire image pixel coordinate system for the pixel of target area；
S4, for the brightness value of target area color separation block is converted into gray value, and ask for the average of each color lump gray value respectively
Value, finally gives the luminance contrast of target area；
S5, the luminance contrast of the current target area obtaining is substituted in image visibility contrast standard, be calculated and work as
Front visibility value V；
For night and both of which on daytime, respectively visibility is mated the bright of the target area that day and night type video camera records
Degree contrast, obtains both functional relationships using the method for matching, constitutes described image visibility contrast standard；Wherein white
Adopt under day mode and adopt infrared ray under visible ray, night mode；
S6, utilize D-S evidence theory, using the visibility recording, current ambient temperature and current humidity as evidence,
It is calculated the maximum visibility distributed area of degree of belief.
9. round-the-clock monitoring the Changjiang river according to claim 8 mountain area section visibility method it is characterised in that：Also include
S7, the interval of the visibility credibility maximum being obtained according to evaluation unit, divide mark according to the mist feelings that Yangtze River waterway department formulates
Standard, is reported to the police according to following standard：
Work as V>When 1000, do not report to the police；
When 1000>V>When 500, do middle mist and report to the police；
Work as V<When 500, do dense fog and report to the police.
10. round-the-clock monitoring the Changjiang river according to claim 8 mountain area section visibility method it is characterised in that：Also wrap
Include S8, in daytime mode, periodically open infrared light supply, maintain a period of time to turn off infrared light supply, this time is pre-
If value.
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| CN113408415B (en) * | 2021-06-18 | 2024-02-02 | 中国民用航空大连空中交通管理站 | Detection and display method based on field visibility and runway visual range of image recognition technology |
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