CN102954937A - Video visibility detector and detection analysis method thereof - Google Patents
Video visibility detector and detection analysis method thereof Download PDFInfo
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- CN102954937A CN102954937A CN201210423907XA CN201210423907A CN102954937A CN 102954937 A CN102954937 A CN 102954937A CN 201210423907X A CN201210423907X A CN 201210423907XA CN 201210423907 A CN201210423907 A CN 201210423907A CN 102954937 A CN102954937 A CN 102954937A
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Abstract
The invention relates to a video visibility detector and a detection analysis method thereof. In the prior art, highway video monitoring data can not be transmitted back to a monitoring center. With the present invention, the condition in the prior art is solved. According to the present invention, the video visibility detector is erected on a highway, such that visibility region detection can be performed on any distribution control points provided with video monitoring, and highway multi-point distribution type visibility detection can be achieved; according to the video visibility detector, a main circuit board, an industrial control plate, a video capture card and a power supply are arranged inside a housing, a camera is arranged outside the housing, or a highway monitoring camera is adopted, a combination way of an embedded integrated machine and the video capture card, and a single frame-image analysis and multi-frame-process analysis method are adopted to carry out an analysis treatment on a front end video signal, and a visibility analysis treatment result is locally stored and externally released through a network, such that long time stable working under an unattended wild environment can be achieved so as to ensure continuity and stability of video visibility detection data.
Description
Technical field
The present invention relates to a kind of meteorological optical range detecting instrument, relate to specifically detector and determination method thereof that a kind of method of utilizing highway system Video Monitoring Terminal and auxiliary light to combine is measured meteorological optical range.
Background technology
Visibility is the meteorologic factor that express way driving safety is had material impact, along with the development of transport science and techonologies, the video image that the road conditions rig camera is passed back in real time carries out analyzing and processing and determines that the method for road conditions range of visibility has become the development trend of visibility measurement.At present, both at home and abroad the observation procedure of visibility is divided into the artificial visually examine and device is surveyed two kinds.Wherein the device measurement equipment is varied, detects principle also different, and the traditional formula of penetrating, diffuse transmission type visiometer cost are high, and intuitive is poor, has preferably consistance and utilize video measuring to compare with artificial observation, and, with low cost.The formula of penetrating is directly measured the gas column transmissivity by the large gas column that light beam sees through between two point of fixity, assess the visibility value with this, this method requires light beam by sufficiently long large gas column, and at low visibility weathers such as rain, mists, again can be because the complex conditions such as water vapor absorption cause larger error, so limitation is very large.Diffuse transmission type then is to infer visibility by the method for laser measurement atmospheric extinction coefficient, and is comparatively objective and accurate comparatively speaking, but the use of this method also only limits to a few studies department at present.This be because laser radar not only cost is expensive, maintenance cost is high, complicated operation, and also be difficult to carry out normal observation in rainy day, greasy weather.Therefore, improve and even reform the visibility Detection Techniques and be still a significant research topic.Traditional video visibility detects the roadmarkings that adopt as object of reference, by calculating visibility in effective detection length of roadmarking in image in different greasy weathers more.This kind detection method is vulnerable to the interference of Various Complex weather and environment (such as the covering of sleet weather to roadmarking, road is overhauled reconstruction, roadmarking wearing and tearing etc.).Simultaneously, night, accuracy of detection also was the problem of video class visibility checkout equipment facing.
Summary of the invention
For the defective that existing meteorological optical range detecting instrument exists, the invention provides that a kind of volume is little, cheap, good stability, precision be high, is erected at video visibility detector and the determination method thereof of highway trackside.
Solving the technical measures that above-mentioned concrete technical problems takes is:
A kind of video visibility detector, it is characterized in that: external video interface 1, industrial control board 2, video frequency collection card 3 and power supply 4 are housed in casing, industrial control board 2 passes through fixedly, and industrial control board copper post 5 is connected with fixed support 14, video frequency collection card 3 is connected with bent plate 14 by fixed video capture card copper post 6, video frequency collection card 3 is connected with video acquisition card interface 9, video acquisition card interface 9 is connected with external video interface 1 by video line 10, industrial control board 2 is connected with power supply 4 by power lead 8, is provided with switch 12 and external power interface 13 at the casing place near power supply 4
, Power supply 4 is connected with external power interface with switch 12 respectively by Switching Power Supply line 11 and is connected, and power lead 8 is connected with the industrial control board power interface 7 that is located at industrial control board 2 outer tip end places
,Be provided with video frequency pick-up head 15 in the casing outside, industrial control board 2 is connected with the output line 16 of video frequency pick-up head 15.
A kind of determination method of video visibility detector is:
Single frames-graphical analysis+multiframe-process analysis procedure analysis
A. single frames-graphical analysis:
By the corresponding relation than video image and visibility in the relatively large different weather situation, by extracting the actual parameter relevant with visibility in the image, with visibility and video image clarity, be that the silhouette contrast degree of object carries out association in the video image, adopt algorithm for pattern recognition, major parameter:
A. the contrast of surveyed area scenery profile;
B. the far and near scenery silhouette contrast of surveyed area degree is poor;
C. the far and near scenery silhouette contrast of surveyed area degree rate over time;
By analysis-by-synthesis, screen several characteristic parameters, generate visibility function f(a, b, c ...) the video visibility that obtains the monitored area after the calculating detects relative value, obtains at last the greasy weather grade of guarded region by mapping table;
B. multiframe-process analysis procedure analysis: at first, detect the contrast of reference point scenery profile, contrast is rate over time; Secondly, when contrast dropped to critical point, the reference point of setting according to configuration file and with reference to visibility namely obtained and visibility data that human eye observation is basically identical; At last, near Highway often has motor vehicle to move, and namely exists and disturbs, and therefore, needs one minute continuous analysis data of record, eliminates and disturbs, and extracts useful data.
The invention has the beneficial effects as follows: the present invention is a kind of novel, comparatively economic and objective visibility detection instrument, utilize the highway system Video Monitoring Terminal, by the analyzing and processing to real time video image, obtain real-time monitored area visibility index, and the visibility analysis processing result is carried out this locality store and externally issue by network, can't be back to the situation of Surveillance center in order to solve the highway video monitoring data, cost is low; Use auxiliary light, solve and analyze a difficult problem night; Without the special sign thing, installation is convenient; Owing to adopting special-purpose meteorological optical range algorithm, the simulation human eye vision is determined based on object sharpness in the surveyed area, so the visibility detected value can not be subjected to the impact of marker in roadmarking or the video surveyed area substantially, measurement range can reach 0-3000 rice, also can obtain comparatively desirable visibility night and detect effect, eliminate the disturbing factors such as car, shade variation, car bulb; By setting up this device, can a little carry out visibility zone and detect deploying to ensure effective monitoring and control of illegal activities of video monitoring is installed arbitrarily, realize that the distributed visibility of highway multiple spot detects, can be under unattended field environment long-time steady operation, thus guarantee that video visibility detects the stability of data.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the B-B sectional view of Fig. 1;
Fig. 4 is special-purpose meteorological optical range algorithm software process flow diagram among the present invention;
Fig. 5 is the on-the-spot scheme of installation of video frequency pick-up head among the present invention;
Fig. 6 is auxiliary light equipment schematic diagram among the present invention;
Fig. 7 be among the present invention night detect the effect schematic diagram;
Fig. 8 is that video visibility detects video data flow process figure among the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is elaborated.
A kind of video visibility detector, such as Fig. 1, Fig. 2 and shown in Figure 3, external video interface 1, industrial control board 2, video frequency collection card 3 and power supply 4 are housed in casing, industrial control board 2 passes through fixedly, and industrial control board copper post 5 is connected with bent plate 14, video frequency collection card 3 is connected with bent plate 14 by fixed video capture card copper post 6, video frequency collection card 3 is connected with video acquisition card interface 9, video acquisition card interface 9 is connected with external video interface 1 by video line 10, industrial control board 2 is connected with power supply 4 by power lead 8, is provided with switch 12 and external power interface 13 at the casing place near power supply 4
, Power supply 4 is connected with external power interface with switch 12 respectively by Switching Power Supply line 11 and is connected, and power lead 8 is connected with the industrial control board power interface 7 that is located at industrial control board 2 outer tip end places
,Be provided with video frequency pick-up head 15 in the casing outside, industrial control board 2 is connected with the output line 16 of video frequency pick-up head 15.
The determination method of video visibility detector is:
Single frames-graphical analysis+multiframe-process analysis procedure analysis
A. single frames-graphical analysis:
By the corresponding relation than video image and visibility in the relatively large different weather situation, by extracting the actual parameter relevant with visibility in the image, with visibility and video image clarity, be that the silhouette contrast degree of object carries out association in the video image, adopt algorithm for pattern recognition, major parameter:
A. the contrast of surveyed area scenery profile;
B. the far and near scenery silhouette contrast of surveyed area degree is poor;
C. the far and near scenery silhouette contrast of surveyed area degree rate over time;
By analysis-by-synthesis, screen several characteristic parameters, generate visibility function f(a, b, c ...) the video visibility that obtains the monitored area after the calculating detects relative value, obtains at last the greasy weather grade of guarded region by mapping table;
B. multiframe-process analysis procedure analysis: at first, detect the contrast of reference point scenery profile, contrast is rate over time; Secondly, when contrast dropped to critical point, the reference point of setting according to configuration file and with reference to visibility namely obtained and visibility data that human eye observation is basically identical; At last, near Highway often has motor vehicle to move, and namely exists and disturbs, and therefore, needs one minute continuous analysis data of record, eliminates and disturbs, and extracts useful data.
The present invention utilizes highway system Video Monitoring Terminal image data, can't be back to the situation of Surveillance center in order to solve the high-speed video monitor data, by setting up embedded video visibility detector, can a little carry out visibility zone and detect deploying to ensure effective monitoring and control of illegal activities of video monitoring is installed arbitrarily, can realize that the distributed visibility of high speed multiple spot detects.The mode that the present invention adopts embedded all-in-one to combine with video frequency collection card is carried out analyzing and processing to the front end vision signal, and the visibility analysis processing result is carried out this locality store and externally issue by network.Can be under the unattended field environment long-time steady operation of embedded all-in-one, thus guarantee that video visibility detects the stability of data.Intelligence distinguish daytime and night algorithm, daytime, direct basis image detail sharpness derived meteorological optical range under the condition without the special sign thing; Derive meteorological optical range according to luminance and the light of auxiliary light along range attenuation night; Use serial ports output meteorological optical range data.Special-purpose meteorological optical range algorithm as shown in Figure 4, at first to set up observed object, image is carried out pre-service, then carry out the Contrast Detection of regional scenery and regional far and near scenery profile, the contrast of finding out regional far and near scenery profile is rate over time, generates visibility function, calculate the visibility relative value, mapping visibility absolute value carries out outlier processing, determines visibility.
Fig. 5 is the on-the-spot scheme of installation of video frequency pick-up head, and both sides are greenbelt among the figure, and the left side is video visibility detector 17, and the right is video frequency pick-up head 15, and video signal cable is connected underground pipeline with power lead and connects this equipment.
Fig. 6 is auxiliary light equipment schematic diagram, mainly helps to obtain the night visibility data at night by utility appliance.
Fig. 7 detects the effect schematic diagram night, configures six auxiliary light equipment, and they and video camera distance are respectively 10m, 20m, 50m, 100m, 200m, 300m.Can see distance lamp farthest, be exactly current visibility.
Fig. 8 is that video visibility detects video data flow process figure among the present invention, at first the simulating signal with video camera is sent in the video frequency collection card, analog signal conversion in video frequency collection card becomes digital signal to be sent in the industrial control board, and the digital signal in industrial control board is sent in the far-end server by the Intent network.Among the present invention, industrial control board is that the embedded industrial control board ECX-1211-6D that skill embedded computer company limited of Boke produces contains in the Shenzhen.
When the present invention uses, at first at highway video frequency pick-up head is installed, also can utilize the freeway surveillance and control camera, at trackside several groups of auxiliary light equipment are installed, visible number by light carries out the visibility detection, auxiliary light equipment is that solar facilities is called for short railway spike, automatically flash luminous night, need not artificial charging, industrial control board is fixed in the casing, industrial control board is connected with the video frequency pick-up head output line, and by special-purpose meteorological optical range algorithm software, the real-time calling video image carries out analytical calculation visibility.
Claims (2)
1. video visibility detector, it is characterized in that: external video interface (1) is housed in casing, industrial control board (2), video frequency collection card (3) and power supply (4), industrial control board (2) passes through fixedly, and industrial control board copper post (5) is connected with bent plate (14), video frequency collection card (3) is connected with bent plate (14) by fixed video capture card copper post (6), video frequency collection card (3) is connected with video acquisition card interface (9), video acquisition card interface (9) is connected with external video interface (1) by video line (10), industrial control board (2) is connected with power supply (4) by power lead (8), is provided with switch (12) and external power interface (13) at the casing place near power supply (4)
,Power supply (4) is connected 13 with switch (12) with external power interface respectively by Switching Power Supply line (11)) be connected, power lead (8) is connected with the industrial control board power interface (7) that is located at industrial control board (2) outer tip end place
,Be provided with video frequency pick-up head (15) in the casing outside, industrial control board (2) is connected with the output line (16) of video frequency pick-up head (15).
2. the determination method of a kind of video visibility detector according to claim 1 is characterized in that:
Single frames-graphical analysis+multiframe-process analysis procedure analysis
A. single frames-graphical analysis:
By the corresponding relation than video image and visibility in the relatively large different weather situation, by extracting the actual parameter relevant with visibility in the image, with visibility and video image clarity, be that the silhouette contrast degree of object carries out association in the video image, adopt algorithm for pattern recognition, major parameter:
A. the contrast of surveyed area scenery profile;
B. the far and near scenery silhouette contrast of surveyed area degree is poor;
C. the far and near scenery silhouette contrast of surveyed area degree rate over time;
By analysis-by-synthesis, screen several characteristic parameters, generate visibility function f(a, b, c ...) the video visibility that obtains the monitored area after the calculating detects relative value, obtains at last the greasy weather grade of guarded region by mapping table;
B. multiframe-process analysis procedure analysis: at first, detect the contrast of reference point scenery profile, contrast is rate over time; Secondly, when contrast dropped to critical point, the reference point of setting according to configuration file and with reference to visibility namely obtained and visibility data that human eye observation is basically identical; At last, near Highway often has motor vehicle to move, and namely exists and disturbs, and therefore, needs one minute continuous analysis data of record, eliminates and disturbs, and extracts useful data.
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| CN108956397A (en) * | 2018-05-23 | 2018-12-07 | 南京大学 | A kind of road visibility detecting method based on trace norm |
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Application publication date: 20130306 |