CN104297176A - Device, system and method for monitoring visibility of channel segments of Yangtze River in mountainous area in all-weather manner - Google Patents
Device, system and method for monitoring visibility of channel segments of Yangtze River in mountainous area in all-weather manner Download PDFInfo
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Abstract
The invention provides a system for monitoring visibility of channel segments of the Yangtze River in a mountainous area in an all-weather manner. The system comprises a mode switching unit used for switching a day or night according to a judgment result and a current time point of a control circuit, an image visibility comparing standard calibrating unit, a picture data processing unit, a target region identifying unit, a target region luminance contrast characteristic value extracting unit, a visibility calculating unit and an evaluating unit. The system is capable of realizing that the visibility is monitored in real time in an all-weather manner and automatically switching two monitoring modes of the day and the night, can be directly arranged on a beacon vessel so that the mist situation is relatively immediately monitored to approach the navigation condition of the beacon vessel in a channel; measured data is relatively accurate and is relatively of a practical significance; the whole set of equipment is relatively low in cost; the erecting density can be increased, the monitoring range is enlarged, and more visibility information is obtained so that the mist channel of the channel is monitored being relatively close to a scene.
Description
Technical field
The invention belongs to monitoring field, be specifically related to the system and method for section, mountain area, a kind of round-the-clock monitoring the Changjiang river visibility.
Background technology
At the Changjiang river mountainous waterway, by water body and extreme terrain environmental impact, frequent fogged-in on river surface.Modal is radiation fog, and endangering maximum is a mist, also has a small amount of advection fog.Group's mist monomer is smaller, general range be tens of rice to hundreds of rice, the outer sight line of group's mist is good, and roll into a ball dim a slice in mist, visibility is extremely low.Due to a mist local, by force sudden, crewman can be made to be caught unprepared, easily to cause major traffic accidents, serious threat is caused to boat.Therefore, the visiometer laying higher density in section, mountain area, the Changjiang river is most important for navigation safety.
The visiometer of current use has transmission-type visiometer, scatter-type visiometer, image pick-up type visiometer and laser radar.According to the Changjiang river mountainous fog feelings feature, and the Changjiang river ship's navigation feature, require that visiometer has degree of precision for the low visibility monitoring of below 1Km.And for the ease of installing on limit, the Changjiang river, require that the volume of instrument is little, low-power consumption, and radiationless pollution.In addition, in order to ensure high density networking, require cheap.According to the principle of mentioned above principle and visiometer, analyze the relative merits of various types of visiometer, the visibility instrument type being applicable to the Changjiang river mountainous waterway special has: monochromatic light road forward scattering visibility meter, image pick-up type visiometer, back scattering visiometer.
Adopt video camera to measure visibility, as automatic monitoring method, the observation of human eye can be replaced, meteorological observation personnel are freed from the fatigue of long-time observation, and the impact of subjective factor can be avoided.Relative to other automatic detection instruments, such as transmission-type visiometer, scatter-type visiometer, image pick-up type visiometer Observation principle is similar to human eye mode, and what record is comprehensive visibility, has more practical significance.Because do not require that high precision can meet measurement requirement, the common day and night type video camera of low cost can be used.In addition, data processing equipment can adopt existing device, reduces costs further.Therefore, relative to other schemes, low cost is one of outstanding feature of the program, particularly significantly can reduce the cost of high density erection.To sum up, how utilizing the type video camera to provide real-time visibility information for the Changjiang river traffic department, is this invention problem to be solved.
Summary of the invention
The technical problem to be solved in the present invention is: the system and method providing section, mountain area, a kind of round-the-clock monitoring the Changjiang river visibility, utilizes the common day and night type video camera of low cost, realizes round-the-clock measurement.
The present invention for solving the problems of the technologies described above taked technical scheme is: the device of section, mountain area, a kind of round-the-clock monitoring the Changjiang river visibility, it is characterized in that: it is included in day and night type video camera and Target Board that light tender is oppositely arranged, the industrial computer that the image transmitting comprising Target Board collected carries to light tender by day and night type video camera, the real-time temperature and humidity information of Temperature Humidity Sensor collection sends to described industrial computer;
Described day and night type video camera carries infrared light supply, moveable infrared filter and full spectrum light glass is provided with between camera lens and CCD, the immigration of infrared filter and full spectrum light glass and be shifted out through camera control control circui, camera control circuit judges it is daytime or night by the data that light sensor collects, thus corresponding control moves into full spectrum light glass or infrared filter and closes or open infrared light supply, judged result is sent to the industrial computer that light tender carries by control circuit simultaneously;
Industrial computer carries out data processing according to adopting corresponding standard at daytime or night, calculates visibility.
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, be provided with delay circuit.
By said apparatus, the output terminal of described industrial computer is connected with display screen and/or warning device.
By said apparatus, described industrial computer communicates with the Surveillance center of the Changjiang river traffic department.
A system for section, mountain area, the round-the-clock monitoring the Changjiang river visibility utilizing the device of section, mountain area, above-mentioned round-the-clock monitoring the Changjiang river visibility to realize, is characterized in that: it comprises:
Mode switch element, for switching daytime or night according to the judged result of control circuit and time point at that time;
The demarcation unit of image visibility contrast standard, for for night and daytime two kinds of patterns, respectively visibility is mated the luminance contrast of the target area that day and night type video camera records, utilizes the method for matching to obtain both funtcional relationships; Wherein adopt visible ray under day mode, under night mode, adopt infrared ray;
Image data processing unit, for being the picture of set form by the Image Saving of day and night type camera acquisition, and serial number;
Target area recognition unit, for the picture of set form that will handle well, utilizes image segmentation, obtains the region of Target Board in picture, as target area, calculates the coordinate range of pixel in entire image pixel coordinate system of target area;
Target area luminance contrast characteristics extraction unit, for being divided target area the brightness value of color lump to be converted into gray-scale value, and asking for the mean value of each color lump gray-scale value respectively, finally obtaining the luminance contrast of target area;
Visibility computing unit, the luminance contrast for the current target area that will obtain substitutes in image visibility contrast standard, calculates current visibility value V;
Evaluation unit, for utilizing D-S evidence theory, using the visibility recorded, current environment temperature and current humidity as evidence, calculates the visibility distributed area that degree of belief is maximum.
By said system, also comprising alarm unit, the interval that the visibility confidence level for obtaining according to evaluation unit is maximum, according to the mist feelings criteria for classifying that Yangtze River waterway department formulates, reporting to the police according to following standard:
As V>1000, do not report to the police;
As 1000>V>500, do middle mist and report to the police;
As V<500, do dense fog and report to the police.
By said system, also comprise visibility record cell, for the visibility value that will obtain according in the corresponding row of the numbering of picture stored in the database table of correspondence.
A method for section, mountain area, the round-the-clock monitoring the Changjiang river visibility utilizing the device of section, mountain area, above-mentioned round-the-clock monitoring the Changjiang river visibility to realize, is characterized in that: it comprises the following steps:
S1, switch daytime or night according to the judged result of control circuit and time point at that time;
S2, be the picture of set form by the Image Saving of day and night type camera acquisition, and serial number;
S3, the picture of set form that will handle well, utilize image segmentation, obtain the region of Target Board in picture, as target area, calculates the coordinate range of pixel in entire image pixel coordinate system of target area;
S4, for being divided target area the brightness value of color lump to be converted into gray-scale value, and asking for the mean value of each color lump gray-scale value respectively, finally obtaining the luminance contrast of target area;
S5, the luminance contrast of current target area obtained to be substituted in image visibility contrast standard, calculate current visibility value V;
For night and daytime two kinds of patterns, respectively visibility is mated the luminance contrast of the target area that day and night type video camera records, utilizes the method for matching to obtain both funtcional relationships, the image visibility contrast standard described in formation; Wherein adopt visible ray under day mode, under night mode, adopt infrared ray;
S6, utilize D-S evidence theory, using the visibility recorded, current environment temperature and current humidity as evidence, calculate the visibility distributed area that degree of belief is maximum.
As stated above, the interval that the visibility confidence level also comprise S7, obtaining according to evaluation unit is maximum, according to the mist feelings criteria for classifying that Yangtze River waterway department formulates, report to the police according to following standard:
As V>1000, do not report to the police;
As 1000>V>500, do middle mist and report to the police;
As V<500, do dense fog and report to the police.
As stated above, under also comprising S8, by day pattern, periodically open infrared light supply, maintenance a period of time closes infrared light supply again, and this time is preset value.
Beneficial effect of the present invention is:
1, utilize the day and night type video camera of low cost to reequip, thus automatically measure visibility, the observation of human eye can be replaced, meteorological observation personnel are freed from the fatigue of long-time observation, and the impact of subjective factor can be avoided; Use apparatus of the present invention, system and method, round-the-clock Real-Time Monitoring visibility can be realized, two kinds of monitoring modes for daytime and night can automatically switch, can be directly installed on light tender, more timely to the monitoring of mist feelings, close to the navigation condition of boats and ships in navigation channel, the data of measurement more accurately have more practical significance; The industrial computer utilizing light tender to carry is cost-saving further; The cost of equipment set is lower, can improve the density of erection, increases the scope of monitoring, obtains more visibility information, makes navigation channel mist feelings monitoring more press close to fact.
2, the Target Board of black and white is utilized, more convenient when processing image.
3, by increasing the unit of reporting to the police or showing or storing, native system is better applied.
4, by increase delay circuit, can avoid between the lights or environment light and shade change fluctuation time the frequent movement of optical filtering, the frequent switch of infrared light supply, improve equipment life.
5, by day under pattern, by periodically opening infrared light supply, utilizing ultrared heat effect, heating to camera lens, allow water smoke evaporation on camera lens, thus avoid camera lens to have water smoke, interference shooting precision.
Accompanying drawing explanation
Fig. 1 is the scheme of installation front elevation of video camera and object.
Fig. 2 is the scheme of installation vertical view of video camera and object.
Fig. 3 is the Target Board pattern of one embodiment of the invention.
Fig. 4 arranges schematic diagram in video camera daytime.
Fig. 5 arranges schematic diagram in video camera night.
Fig. 6 is concrete implementing procedure figure.
Fig. 7 is visibility calculation flow chart.
Fig. 8 is evaluation unit process flow diagram.
Embodiment
Below in conjunction with instantiation, the present invention will be further described.
The device of section, mountain area, a kind of round-the-clock monitoring the Changjiang river provided by the invention visibility as depicted in figs. 1 and 2, be included in day and night type video camera and Target Board that light tender is oppositely arranged (in the present embodiment, Target Board is made up of black-and-white two color, wherein outer ring is black, center is white, as shown in Figure 3), day and night type video camera industrial computer that the image transmitting of the Target Board collected is carried to light tender; Described day and night type video camera carries infrared light supply, moveable infrared filter and full spectrum light glass is provided with between camera lens and CCD, as shown in Figure 4 and Figure 5, the immigration of infrared filter and full spectrum light glass and be shifted out through camera control control circui, camera control circuit judges it is daytime or night by the data that light sensor collects, thus corresponding control moves into full spectrum light glass or infrared filter and closes or open infrared light supply, judged result is sent to the industrial computer that light tender carries by control circuit simultaneously; The real-time temperature and humidity information of Temperature Humidity Sensor collection sends to described industrial computer; Industrial computer carries out data processing according to adopting corresponding standard at daytime or night, calculates visibility.
The video camera used carries infrared light supply, has an infrared filter, filtering visible ray and ultraviolet between camera lens and CCD, and also have a full spectrum light glass, pasted cutoff filter, filtering infrared ray avoids colour cast, closer to the observation of human eye.Automatically remove infrared filter during daytime, move into full spectrum light glass, allow evening infrared filter get back between CCD and camera lens, shift out full spectrum light glass, and open infrared light supply.The opening and closing of full spectrum light glass here, the movement of infrared filter, infrared light supply is all rely on the break-make experiencing the light sensor (be generally photoresistance, also can adopt other photosensitive device) of surround lighting to control.
Preferably, in order to avoid between the lights or environment light and shade change fluctuation time the frequent movement of optical filtering, the frequent switch of infrared light supply, can a delay circuit be set between light sensor and camera control circuit.
The output terminal of described industrial computer is connected with display screen and/or warning device, and industrial computer communicates with the Surveillance center of the Changjiang river traffic department.
A system for section, mountain area, the round-the-clock monitoring the Changjiang river visibility utilizing the device of section, mountain area, above-mentioned round-the-clock monitoring the Changjiang river visibility to realize, comprising:
Mode switch element, for switching daytime or night according to the judged result of control circuit and time point at that time.
The demarcation unit of image visibility contrast standard, for for night and daytime two kinds of patterns, respectively visibility is mated the luminance contrast of the target area that day and night type video camera records, utilizes the method for matching to obtain both funtcional relationships; Wherein adopt visible ray under day mode, under night mode, adopt infrared ray; This demarcation unit just uses when formulating image visibility contrast standard, once complete the task of demarcation, this unit, with regard to break-off, belongs to the precondition of system software work.
Image data processing unit, for being the picture of set form by the Image Saving of day and night type camera acquisition, and serial number; For subsequent treatment provides picture.
Target area recognition unit, for the picture of set form that will handle well, utilizes image segmentation, obtains the region of Target Board in picture, as target area, calculates the coordinate range of pixel in entire image pixel coordinate system of target area.
Target area luminance contrast characteristics extraction unit, for being divided target area the brightness value of color lump to be converted into gray-scale value, and asking for the mean value of each color lump gray-scale value respectively, finally obtaining the luminance contrast of target area.
Visibility computing unit, the luminance contrast for the current target area that will obtain substitutes in image visibility contrast standard, calculates current visibility value V;
Evaluation unit, for utilizing D-S evidence theory, using the visibility recorded, current environment temperature and current humidity as evidence, calculates the visibility distributed area that degree of belief is maximum.
Preferably, also comprising alarm unit, the interval that the visibility confidence level for obtaining according to evaluation unit is maximum, according to the mist feelings criteria for classifying that Yangtze River waterway department formulates, reporting to the police according to following standard:
As V>1000, do not report to the police;
As 1000>V>500, do middle mist and report to the police;
As V<500, do dense fog and report to the police.
Preferably, visibility distributed area maximum for degree of belief being sent to the Surveillance center of the Changjiang river traffic department, when receiving the alerting signal of alarm unit, alerting signal being sent to Surveillance center; The date and time value that monitoring center software passes down can also be received in addition, date and time calibration is carried out to system, and feedback calibration information, realize synchronous.
Preferably, also comprise visibility record cell, for the visibility value that will obtain according in the corresponding row of the numbering of picture stored in the database table of correspondence, can also according to the regulation of program, periodic cleaning database, saves internal memory.
A method for section, mountain area, the round-the-clock monitoring the Changjiang river visibility utilizing the device of section, mountain area, above-mentioned round-the-clock monitoring the Changjiang river visibility to realize, comprises the following steps:
S1, switch daytime or night according to the judged result of control circuit and time point at that time;
S2, be the picture of set form by the Image Saving of day and night type camera acquisition, and serial number;
S3, the picture of set form that will handle well, utilize image segmentation, obtain the region of Target Board in picture, as target area, calculates the coordinate range of pixel in entire image pixel coordinate system of target area;
S4, for being divided target area the brightness value of color lump to be converted into gray-scale value, and asking for the mean value of each color lump gray-scale value respectively, finally obtaining the luminance contrast of target area; In the present embodiment:
(1)，
(2)，
Gi (x in formula (1), y) gray-scale value of any point pixel of representative picture target area dark circles loop section, N1 represents the sum of this dark circles loop section pixel, and f1 (x, y) represents the average gray value of this dark circles loop section; The gray-scale value of some pixels of gi (x, y) representative picture target area center white part in formula (2), N2 represents the sum of this center white partial pixel, and f2 (x, y) represents the average gray value of this center white part; So luminance contrast c can be obtained by formula below:
(3)；
S5, the luminance contrast of current target area obtained to be substituted in image visibility contrast standard, calculate current visibility value V.
For night and daytime two kinds of patterns, respectively visibility is mated the luminance contrast of the target area that day and night type video camera records, utilizes the method for matching to obtain both funtcional relationships, the image visibility contrast standard described in formation; Wherein adopt visible ray under day mode, under night mode, adopt infrared ray.
S6, utilize D-S evidence theory, using the visibility recorded, current environment temperature and current humidity as evidence, calculate the visibility distributed area that degree of belief is maximum.
The visibility value recorded by video camera, the data of humidity and temperature sensor merge, common support same conclusion, and 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 identify space, and H={h1, h2, h3, h4, h5}, h1, h2, h3, h4, h5 are the fundamental elements of this subset; Wherein h1={1000<V<2000}, h2={500<V<1000}, h3={200<V<500}, h4={50<V<200}, h5={V<50};
(3) CF is CF, represents with aggregate form, in every bar knowledge ai, bi or ci respectively with hi(i=1,2,3,4,5) corresponding, point out the confidence level of hi;
Wherein ∑ ci≤1, ci >=0, i=1,2,3,4,5;
The rule of thumb known E1 in space, the probability distribution function m1 of E2 and E3, m2, m3, D-S evidence theory is utilized to carry out the compound of evidence, obtain the probability distribution function m of compound evidence, obtain m (h1) afterwards, m (h2), m (h3), m (h4), m (h5), m (H), the lower limit Bel (h1) of interval trusting degree can be obtained further, Bel (h2), Bel (h3), Bel (h4), Bel (h5), and the upper limit Pl of interval trusting degree (h1), Pl (h2), Pl (h3), Pl (h4), Pl (h5), so just can obtain visibility interval at the trusting degree of five interval distributions, through comparing, can the maximum interval of degree of establishing trust, using it input interval as alarm unit, report to the police for judging whether.
Preferably, the interval that the visibility confidence level also comprise S7, obtaining according to evaluation unit is maximum, according to the mist feelings criteria for classifying that Yangtze River waterway department formulates, report to the police according to following standard:
As V>1000, do not report to the police;
As 1000>V>500, do middle mist and report to the police;
As V<500, do dense fog and report to the police.
Preferably, under also comprising S8, by day pattern, periodically open infrared light supply, maintenance a period of time closes infrared light supply again, and this time is preset value.
Preferably, the current visibility value asked for can be averaged process, then average energy is shown in the evidence E1 of angle value as evaluation unit in certain hour, thus improve the reliability evaluated.
During concrete enforcement, as shown in Figure 6, comprise the following steps:
Step 1: system log (SYSLOG) current time T0;
Step 2: to system input image data and generating pictures, and preserve the picture generated, 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 greater than 60s, if then perform step 6, otherwise performs step 2;
Step 6: the visibility value in a minute is done average treatment, obtains and preserves the visibility mean value in one minute;
Step 7: evaluate;
Step 8: report to the police;
Step 9: executive communication unit, if there is warning, preserves alarm logging, gets back to step 1.
Described step 3 as shown in Figure 7, comprises the following steps:
Step 31: input picture;
Step 32: the picture of system to input carries out the identification of target area, because video camera is relative with the position of Target Board constant, so position in the picture, the picture position of Target Board is constant, only needs to identify once;
Step 33: the luminance contrast calculating the target area of picture;
Step 34: determine to adopt which image visibility contrast standard according to the make-and-break signal of photoresistance, if be state 1, performs step 35, otherwise performs step 36;
Step 35: the luminance contrast of the target area calculated is substituted into day images visibility contrast standard, calculates daytime visibility;
Step 36: the luminance contrast of the target area calculated is substituted into evening images visibility contrast standard, calculates visibility at night;
Step 37: preserve visibility value.
Described step 7 as shown in Figure 8, comprises 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 are as evidence, utilize experience space, obtain the probability distribution function of evidence;
Step 73: the evidence Combined Processing utilizing evidence theory, merges camera data, temperature sensor and humidity data, calculates the degree of belief in each visibility interval;
Step 74: export the interval with maximum trust;
Step 75: Output rusults is fed back to experience space.
Above embodiment is only for illustration of design philosophy of the present invention and feature, and its object is to enable those skilled in the art understand content of the present invention and implement according to this, protection scope of the present invention is not limited to above-described embodiment.So all equivalent variations of doing according to disclosed principle, mentality of designing or modification, all within protection scope of the present invention.
Claims (11)
1. the device of section, mountain area, round-the-clock monitoring the Changjiang river visibility, it is characterized in that: it is included in day and night type video camera and Target Board that light tender is oppositely arranged, the industrial computer that the image transmitting comprising Target Board collected carries to light tender by day and night type video camera, the real-time temperature and humidity information of Temperature Humidity Sensor collection sends to described industrial computer;
Described day and night type video camera carries infrared light supply, moveable infrared filter and full spectrum light glass is provided with between camera lens and CCD, the immigration of infrared filter and full spectrum light glass and be shifted out through camera control control circui, camera control circuit judges it is daytime or night by the data that light sensor collects, thus corresponding control moves into full spectrum light glass or infrared filter and closes or open infrared light supply, judged result is sent to the industrial computer that light tender carries by control circuit simultaneously;
Industrial computer carries out data processing according to adopting corresponding standard at daytime or night, calculates visibility.
2. the device of section, mountain area, round-the-clock monitoring the Changjiang river according to claim 1 visibility, is characterized in that: described Target Board is made up of black-and-white two color.
3. the device of section, mountain area, round-the-clock monitoring the Changjiang river according to claim 1 visibility, is characterized in that: be provided with delay circuit between described light sensor and camera control circuit.
4. the device of section, mountain area, round-the-clock monitoring the Changjiang river according to claim 1 visibility, is characterized in that: the output terminal of described industrial computer is connected with display screen and/or warning device.
5. the device of section, mountain area, round-the-clock monitoring the Changjiang river according to claim 1 visibility, is characterized in that: described industrial computer communicates with the Surveillance center of the Changjiang river traffic department.
6. a system for section, mountain area, the round-the-clock monitoring the Changjiang river visibility utilizing the device of section, mountain area, the round-the-clock monitoring the Changjiang river visibility described in claim 1 to realize, is characterized in that: it comprises:
Mode switch element, for switching daytime or night according to the judged result of control circuit and time point at that time;
The demarcation unit of image visibility contrast standard, for for night and daytime two kinds of patterns, respectively visibility is mated the luminance contrast of the target area that day and night type video camera records, utilizes the method for matching to obtain both funtcional relationships; Wherein adopt visible ray under day mode, under night mode, adopt infrared ray;
Image data processing unit, for being the picture of set form by the Image Saving of day and night type camera acquisition, and serial number;
Target area recognition unit, for the picture of set form that will handle well, utilizes image segmentation, obtains the region of Target Board in picture, as target area, calculates the coordinate range of pixel in entire image pixel coordinate system of target area;
Target area luminance contrast characteristics extraction unit, for being divided target area the brightness value of color lump to be converted into gray-scale value, and asking for the mean value of each color lump gray-scale value respectively, finally obtaining the luminance contrast of target area;
Visibility computing unit, the luminance contrast for the current target area that will obtain substitutes in image visibility contrast standard, calculates current visibility value V;
Evaluation unit, for utilizing D-S evidence theory, using the visibility recorded, current environment temperature and current humidity as evidence, calculates the visibility distributed area that degree of belief is maximum.
7. the system of section, mountain area, round-the-clock monitoring the Changjiang river according to claim 6 visibility, it is characterized in that: also comprise alarm unit, for the interval that the visibility confidence level obtained according to evaluation unit is maximum, according to the mist feelings criteria for classifying that Yangtze River waterway department formulates, report to the police according to following standard:
As V>1000, do not report to the police;
As 1000>V>500, do middle mist and report to the police;
As V<500, do dense fog and report to the police.
8. the system of section, mountain area, round-the-clock monitoring the Changjiang river according to claim 6 visibility, is characterized in that: also comprise visibility record cell, for the visibility value that will obtain according in the corresponding row of the numbering of picture stored in the database table of correspondence.
9. a method for section, mountain area, the round-the-clock monitoring the Changjiang river visibility utilizing the device of section, mountain area, the round-the-clock monitoring the Changjiang river visibility described in claim 1 to realize, is characterized in that: it comprises the following steps:
S1, switch daytime or night according to the judged result of control circuit and time point at that time;
S2, be the picture of set form by the Image Saving of day and night type camera acquisition, and serial number;
S3, the picture of set form that will handle well, utilize image segmentation, obtain the region of Target Board in picture, as target area, calculates the coordinate range of pixel in entire image pixel coordinate system of target area;
S4, for being divided target area the brightness value of color lump to be converted into gray-scale value, and asking for the mean value of each color lump gray-scale value respectively, finally obtaining the luminance contrast of target area;
S5, the luminance contrast of current target area obtained to be substituted in image visibility contrast standard, calculate current visibility value V;
For night and daytime two kinds of patterns, respectively visibility is mated the luminance contrast of the target area that day and night type video camera records, utilizes the method for matching to obtain both funtcional relationships, the image visibility contrast standard described in formation; Wherein adopt visible ray under day mode, under night mode, adopt infrared ray;
S6, utilize D-S evidence theory, using the visibility recorded, current environment temperature and current humidity as evidence, calculate the visibility distributed area that degree of belief is maximum.
10. the method for section, mountain area, round-the-clock monitoring the Changjiang river according to claim 9 visibility, it is characterized in that: the interval that the visibility confidence level also comprise S7, obtaining according to evaluation unit is maximum, according to the mist feelings criteria for classifying that Yangtze River waterway department formulates, report to the police according to following standard:
As V>1000, do not report to the police;
As 1000>V>500, do middle mist and report to the police;
As V<500, do dense fog and report to the police.
11. the method for section, mountain area, round-the-clock monitoring the Changjiang river according to claim 9 visibility, is characterized in that: under also comprising S8, by day pattern, periodically open infrared light supply, maintenance a period of time closes infrared light supply again, and this time is preset value.
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| CN112649900A (en) * | 2020-11-27 | 2021-04-13 | 上海眼控科技股份有限公司 | Visibility monitoring method, device, equipment, system and medium |
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| US6853453B2 (en) * | 1999-03-12 | 2005-02-08 | Regents Of The University Of Minnesota | Video camera-based visibility measurement system |
| JP4463388B2 (en) * | 2000-06-29 | 2010-05-19 | 小糸工業株式会社 | Visual status measurement device |
| CN102854138A (en) * | 2012-03-23 | 2013-01-02 | 中国气象局北京城市气象研究所 | Visibility measuring system and method based on digital camera shooting method |
| CN202495997U (en) * | 2012-03-29 | 2012-10-17 | 天津银箭科技有限公司 | 600 TVLine mobile type double-filter camera |
| CN103149603B (en) * | 2013-03-07 | 2015-07-01 | 安徽皖通科技股份有限公司 | Road weather detection method based on video |
| CN103630496B (en) * | 2013-12-12 | 2015-09-30 | 南京大学 | Based on the traffic video visibility detecting method of road surface apparent brightness and least square method |
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- 2014-09-17 CN CN201410474966.9A patent/CN104297176B/en not_active Expired - Fee Related
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| WO2018006659A1 (en) * | 2016-07-08 | 2018-01-11 | 杭州海康威视数字技术股份有限公司 | Method and apparatus for acquiring channel monitoring target |
| CN106770087A (en) * | 2016-11-24 | 2017-05-31 | 大连海事大学 | Greasy dirt remote sensing module, system and method |
| CN106770087B (en) * | 2016-11-24 | 2019-08-20 | 大连海事大学 | Greasy dirt remote sensing module, system and method |
| CN112649900A (en) * | 2020-11-27 | 2021-04-13 | 上海眼控科技股份有限公司 | Visibility monitoring method, device, equipment, system and medium |
| CN113408415A (en) * | 2021-06-18 | 2021-09-17 | 中国民用航空大连空中交通管理站 | Detection and display system for airport visibility and runway visual range based on image recognition technology |
| 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 |
| CN116106985A (en) * | 2023-02-21 | 2023-05-12 | 兰州大学 | Intelligent unmanned aerial vehicle can degree of freedom observation system |
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