CN104280344A - System and method for measuring visibility based on digital photographing method - Google Patents
System and method for measuring visibility based on digital photographing method Download PDFInfo
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Abstract
The invention discloses a system and a method for measuring the visibility based on a digital photographing method. The system comprises a digital photographing unit, an image processing unit, a visibility calculating unit, a control unit, a network connection unit, a serial server which is connected with the image processing unit and is used as a communication interface converter, a computer and a router which is used for building a local area network between the image processing unit and the computer. Compared with the prior art, image data of a target object are obtained by the digital photographing unit; the stability and quality of the target object are ensured by a target blackbody and a target light source; and the target light source is an LED lattice array light-emitting plate.
Description
Technical field
The present invention relates to visibility measurement field, particularly relate to a kind of Visibility Measures System based on digital camera method and method.
Background technology
Visibility is one has the meteorological element of material impact to aviation, navigation, land transportation and military activity etc.Visibility observation has very important effect in fields such as weather forecast, traffic, environment, is closely related with the development of the national economy and people life property safety.Particularly in recent years, put on the agenda, the daily observation of visibility as the closedown, the speed limit of vehicle, the landing of aircraft etc. of highway gradually in many fields.Can say, the real-time monitored of visibility and forecast have been become a reality indispensable important content in life.
Up to now, both at home and abroad to the observation of visibility mostly or based on artificial visually examine, standardization and objectivity poor.For China, the observation of 2414 national weather station visibility still mainly adopts artificial observation mode, and have very large subjectivity, the data updating cycle is long, is difficult to the demand meeting weather forecast and service.In visibility apparatus measures, the equipment adopted at present mainly contains atmospheric transmission instrument and laser visibility automatic measuring instrument.The former directly measures gas column transmissivity by light beam through the large gas column between two point of fixity, visibility value is assessed with this, this method requires that light beam is by sufficiently long large gas column, and at the low visibility weather such as rain, mist, can cause comparatively big error because of complex conditions such as water vapor absorption again, therefore limitation is very large.Latter infers visibility by the method for laser measurement atmospheric extinction coefficient, comparatively objective and accurate comparatively speaking, but the use of this method is also only limitted to a few studies department at present.This is because laser radar not only cost intensive, maintenance cost are high, complicated operation, and be also difficult to carry out normal observation in rainy day, greasy weather.Therefore, to improve and even innovation visibility Detection Techniques are still a significant research topic.
It is directly absorbed the image of selected target thing by digital camera that digital camera method measures visibility, then sends into computing machine and carries out analyzing and processing, automatic acquisition visibility value.This method digital camera replaces human eye, and imitation human eye observation and people, to the sense of reality of visibility, are a kind of new visibility observation procedures.It copies the principle of artificial visually examine's visibility completely, and the definition according to visibility is developed, and is most scientific visibility detection method, replaces the best instrument of artificial observation visibility especially.
Through research and the experiment of several years, digital camera method atmospheric sounding visibility technology has achieved breakthrough achievement in research, but also there is the place needing to improve further, especially design of system integration and instrument product approval.Based on the visibility measurement of digital camera method, design and Implement a kind of novel, comparatively economic and objective visibility detection system, become development trend and the active demand of visibility measurement research.The digital camera method Visibility Measures System of weather conditions and geographical conditions under complex environment can be tackled, the numerous areas such as aviation, navigation, land transportation and military activity will be applied in, there are huge market outlook.
Be in the Chinese invention application before the same applicant of 201210080662.5 at application number, propose with laser as target light source, thus carry out night-time observation.But in this earlier application, applicant also clearly proposes LASER Light Source due to the high restriction of its price, always cannot the shortcoming of large-scale production and application well.In addition, somebody proposes to utilize electroluminescence (electroluminescent, EL) light source to reduce costs, but, EL light source owing to being utilize chemical energy to be converted to luminous energy, therefore its to there is serviceable life not long, the shortcomings such as brightness is not high.
Therefore, propose a kind of low cost, the luminescence unit of high brightness as target light source, be the further technical matters that this area will solve.
Summary of the invention
Comprehensive above consider, the LED lattice array luminous plaque that the present invention proposes to utilize multiple LED to form is as the target light source of visiometer use at night.Compared to other light sources, such as EL back light, LASER Light Source etc., as light source, LED lattice array luminous plaque has that brightness is high, stable performance, long service life, cost is low and control the features such as convenient, is suitable as very much the target light source of visiometer.
Based on the Visibility Measures System of digital camera method, it comprises:
Bracing or strutting arrangement, it utilizes universal joint to carry digital image pickup unit, and described universal joint direction no longer changes after determining, is connected bottom universal joint with mounting platform,
Digital image pickup unit, it is for taking selected object and captured object image being outputted to graphics processing unit, and wherein, described object comprises as the target black matrix detecting more than 2 or 2 daytime and 2 target light source detected as night; Described 2 target light source are 2 independently LED lattice array luminous plaques;
Graphics processing unit, the object image that it obtains the shooting by above-mentioned digital image pickup unit uses target location algorithm to carry out accurate localizing objects thing, extracts the brightness value of this object and outputs to visibility computing unit;
Visibility computing unit, it is according to the brightness value of the above-mentioned object image extracted by above-mentioned graphics processing unit, use dual differential luminance contrast equation, calculate visibility value, and the arithmetic mean obtaining above-mentioned object all directions visibility value is as current visibility;
Control module, comprises digital image pickup unit controller, and it is large/little to the camera lens zoom of digital image pickup unit, it is far away/near to focus on, aperture ON/OFF controls;
Network connection unit, comprise the serial server be connected with graphics processing unit, it is as Communication Interface Converter; And, computing machine; And router, is responsible for building the LAN (Local Area Network) connecting graphics processing unit and computing machine;
Equipment protection unit, comprises outdoor equipment protective device, and this outdoor equipment protective device has multi-layer sealed heat insulating construction, holds and needs the equipment of outside work and carry out humiture protection to it.
As preferably, described digital image pickup unit also comprises PWM modular converter, uses described PWM modular converter to control the overall brightness of all LED in described LED lattice array luminous plaque.
As preferably, described digital image pickup unit also comprises PWM modular converter, uses described PWM modular converter to control the brightness of each LED respectively.
As preferably, described PWM modular converter comprises routing submodule, and described routing submodule for selecting specific LED, thus controls by the brightness of the LED selected.
As preferably, described PWM modular converter also comprises brightness ratio and regulates submodule, described brightness ratio regulates submodule for regulating the overall brightness of one of them LED lattice array luminous plaque, to make it equal or proportional with the overall brightness of another LED lattice array luminous plaque.
As preferably, the overall brightness of the LED lattice array luminous plaque be conditioned be through softbox after overall brightness, or the overall brightness before softbox.
As preferably, described digital image pickup unit also comprises 2 softbox, and the light source that each LED lattice array luminous plaque sends is converted into the area source of brightness uniformity before being placed in corresponding LED lattice array luminous plaque by each softbox.
The present invention also provides a kind of measuring method of the Visibility Measures System based on digital camera method, comprise with
Lower step:
One, object is built; Universal joint is utilized to carry digital image pickup unit, described universal joint direction no longer changes after determining, be connected with mounting platform bottom universal joint, can left rotation and right rotation, universal joint side is adjustable industrial camera is to coming back or bowing, and universal joint top and constant temperature are made a video recording bottom hood and is connected, the front and back position of adjustable industrial camera, wherein, described object comprises as the target black matrix detecting more than 2 or 2 daytime and 2 target light source detected as night; Described 2 target light source are 2 independently LED lattice array luminous plaques;
Two, the object that shooting in digital image pickup unit interval N minute is selected, and send the image comprising object to graphics processing unit;
Three, by the mode that network remote logs in, utilize computer operation digital image pickup unit controller large/little to camera lens zoom, focus on far away/near, aperture ON/OFF and adjust, make the imaging of object reach optimum efficiency;
Four, object and object of reference around thereof are demarcated: use target location algorithm accurately locate the object of above-mentioned object image and extract the brightness value of this object;
Five, obtain atmospheric visibility according to visibility computing formula: calculate all directions visibility value of above-mentioned object by Bi-objective dual differential luminance contrast algorithm, and the arithmetic mean average obtaining this all directions visibility value is as current visibility value.
The present invention has the following advantages and good effect:
1, utilize LED lattice array luminous plaque as target light source, thus achieve that brightness is high, stable performance, long service life, cost is low and control the advantages such as convenient.。
2, utilize PWM to the brightness of control LED lattice array luminous plaque, the serviceable life of LED lattice array luminous plaque can be extended further, and the proportion adjustment between two luminous plaques and correction are also provided conveniently.
3, utilize softbox to substitute original frosted glass, the weight of visiometer can be alleviated, and more difficult damaged.
4, by daytime target black matrix, night target light source combine mode, visibility measurement can round-the-clockly be carried out.
Accompanying drawing explanation
By being described embodiment below in conjunction with accompanying drawing, above-mentioned characteristic sum technological merit of the present invention will become apparent and easy understand.
Fig. 1 is the system schematic figure of the embodiment of the present invention;
Fig. 2 is the system layout schematic diagram of the embodiment of the present invention;
Fig. 3 is system flowchart of the present invention.
Fig. 4 shows LED dot matrix plate and the position relationship between softbox and LED dot matrix plate.
Fig. 5 shows the control circuit of LED lattice array luminous plaque.
Number in the figure is as follows: 1-black box, 2-LED lattice array luminous plaque, 3-industrial computer, 4-industrial camera, 5-digital tripod head, 6-computing machine.
Embodiment
Below in conjunction with the drawings and specific embodiments, further detailed description is done to the present invention.
In the following description, mode only by illustrating is described some example embodiment of the present invention, undoubtedly, those of ordinary skill in the art can recognize, when without departing from the spirit and scope of the present invention, can revise described embodiment with various different modes.Therefore, accompanying drawing and be described in just illustrative in essence, instead of for limiting the protection domain of claim.
For the ease of understanding the present invention, below system of the present invention and using method are described in detail respectively.
Based on the Visibility Measures System of digital camera method, comprise with lower part:
Target black matrix, as the object that daytime is detected, black matrix volume 30x30x60CM (the wide * of long * is dark), steel or ferrous material, hollow, wall thickness 1.5MM, central opening bore 11x11CM just above, weight is no more than 20KG, and black matrix internal face pastes light absorbent.
Target light source, as the object that night is detected, volume 30x30x60CM (the wide * of long * is dark), steel or ferrous material, inner installation LED lattice array luminous plaque, wall thickness 1.5MM, softbox is installed just above, described softbox can be resin material etc., and weight is no more than 20KG, and internal face pastes light absorbent.The light that described softbox can make LED lattice array luminous plaque send is more even, is more convenient to be detected.In addition, on depth direction (60CM), each LED lattice array luminous plaque is all placed in a rectangular parallelepiped, preferably, is placed on the position compared with depths in rectangular parallelepiped.As an embodiment, LED lattice array luminous plaque is placed on the optional position in rear 1/2nd (such as, from distance opening 30CM to distance opening 60CM place) in rectangular parallelepiped.The advantage of placement like this is, the light that LED lattice array luminous plaque is sent is subject to the impact of external environmental light as few as possible, can exclude the interference of other light when night detects better.
Adopt the target black matrix of more than 2 or 2 as daylight observation target, adopt 2 target light source as night-time observation target, wherein, described target light source is LED lattice array luminous plaque.
Multiple LED (light emitting diode) is arranged in array format, to form an area source.To the control of multiple LED, the mode of pulse-length modulation (PWM) can be taked carry out, also can control point by point each LED.
Compared to other light sources, such as EL back light, LASER Light Source etc., LED lattice array light source has that brightness is high, stable performance, long service life, cost is low and control the features such as convenient, is suitable as very much the target light source of visiometer.
As shown in Figure 4, show the schematic diagram of the LED dot matrix plate of a 12*12 and the location diagram between softbox and LED dot matrix plate, wherein, softbox is placed in the front side of LED dot matrix plate, be provided for the light that LED lattice array luminous plaque sends more even and soft, form stable area source.
Because two LED lattice array luminous plaques are independently luminous, the luminance brightness therefore sent in order to avoid two LED lattice array luminous plaques is unequal or do not become fixing ratio, needs regularly to correct the brightness of each LED lattice array luminous plaque.The brightness of certain LED lattice array luminous plaque can be heightened or be turned down to described correction by carrying out PWM control to each LED lattice array luminous plaque, thus.Correspondingly, described digital image pickup unit also comprises PWM modular converter, for controlling each LED in LED lattice array luminous plaque.
In addition, when carrying out pointwise control to each LED, can also comprise one for selecting the routing submodule of other LED in PWM modular converter, described routing submodule by FPGA programming realization, also can be realized by special LED control circuit.Such as, described special LED control circuit can be the 8x3 channel LED constant-current driven chip (model is DM163) that Taiwan Dianjing Science and Technology Co., Ltd manufactures, and this driving chip can realize the control respectively to 192 (8*24) individual LED.As replacement, in PWM modular converter, routing submodule can not also be comprised.
Owing to not using laser as light source, therefore just do not need to use optical splitter yet.Although many in systems in which to two the independently correction module of LED lattice array luminous plaque and correction programs, still can reduce cost, and control convenient.In addition, the brightness of two independently LED lattice array luminous plaques can have fixing ratio, and such as, luminous ratio can remain 2:1,3:1,4:1 or 1:2,1:3,1:4.Like this, two LED lattice array luminous plaques alternately can send stronger brightness (being such as another twice brightness), another LED lattice array luminous plaque just can only send a half intensity thus, alternately can save the serviceable life of each LED lattice array luminous plaque thus, and any adverse effect can not be caused to observation.
Correspondingly, in PWM modular converter, also comprise corresponding brightness ratio and regulate submodule.Described brightness ratio regulates submodule at least can regulate the brightness of one of them LED lattice array luminous plaque, to make it equal or proportional with the brightness of another LED lattice array luminous plaque.
For the LASER Light Source be divided into two by optical splitter, although principle need not correct two LASER Light Source, if its separately before the spot degree varies sample of frosted glass, then also can there is the problem that the brightness that is detected is inconsistent.Therefore, in order to overcome the inconsistent problem of this brightness, it may be necessary for regularly carrying out clean to frosted glass.
But, for the light source of two LED lattice array luminous plaques, its brightness uniformity or proportional be kept, then need regularly to correct.Correction program is program conventional in prior art, omits the description to it at this.In addition, owing to can carry out outside softbox the detection of light source at timing, therefore, even if there is the problem that spot degree varies causes between each softbox, also correct in the lump by correction program, eliminate the error that may cause because of softbox.Correspondingly, in digital image pickup unit, submodule is regulated to perform calibration function by described brightness ratio; In addition, digital image pickup unit also can comprise the correction module worked alone.Described brightness ratio adjustment submodule or independently correction module at least can correct the brightness (without the brightness of softbox or the brightness after softbox) of one of them LED lattice array luminous plaque, to make it equal or proportional with the brightness of another LED lattice array luminous plaque.
Shown in composition graphs 5, the control circuit of LED lattice array luminous plaque can comprise the control module (single-chip microcomputer, embedded chip etc.), PWM modular converter, LED drive module, correction module etc. that are linked in sequence, thus it is luminous to carry out driving LED lattice array luminous plaque according to received control signal.Wherein, PWM modular converter can further include brightness ratio and regulates submodule and routing submodule.Function and the annexation of each module are described above, no longer repeat at this.
In the present embodiment, graphics processing unit and visibility computing unit are integrated in industrial computer 3, and industrial computer 3 dominant frequency is not less than 1GHz, internal memory is not less than 1G, supports Large Copacity CF card or portable hard drive, has the USB port/network interface of sufficient amount, volume is little, and quality is light, low in energy consumption.
In the present embodiment, digital camera adopts the high precision CCD industrial camera exporting and be not less than 10, and the camera lens of digital image pickup unit adopts industrial lens; Industrial camera 4 is responsible for the stable high quality graphic of shooting and sends industrial computer 3 to, and described industrial camera 4CCD size is not less than 1/2, and resolution is not less than 1024x768, line by line scan, export and be not less than 10, frame per second is not less than 15FPS, USB or network interface, image stabilization.Industrial lens is C or CS mouth.
In the present embodiment, target light source is LED lattice array luminous plaque 2, and target black matrix is black box 1.
Constant temperature shooting hood, above-mentioned industrial camera 4 sets within it, and is maintained the temperature within the scope of the precision works of industrial camera 4 by fan and well heater, and described constant temperature shooting hood is all-weather protective cover, operating ambient temperature-35-65 DEG C, realizes constant temperature by fan, well heater, sky shade etc.
Digital tripod head, can all-directional rotation, can establish presetting bit, The Cloud Terrace withstand strong wind, operates steadily reliable, and has stoppage protection function.In the present embodiment, digital tripod head is selected.
Digital image pickup unit controller, provides lens control, Long Distant Transmit, and polyphaser ID is arranged, and provides camera lens " zoom large/little, focus on far away/near, aperture ON/OFF " to control, provides the control such as rain brush, light.
Digital tripod head controller, provides The Cloud Terrace " upper and lower, left and right " to control,
Serial server, as Communication Interface Converter, complete the data conversion between the serial ports such as RS-232/485/422 to TCP/IP network, serial equipment can be allowed to network immediately, realize the full automation network management of commercial unit, realize from serial ports to TCP/IP, TCP/IP is to the complete transparent transmission of serial ports.
Router, is responsible for building LAN (Local Area Network), makes industrial computer 3 data can be sent to computing machine 6 at a distance, when transmission range is not far, can avoid using wireless module.
Wireless module, apart from connecting long-range industrial computer 3 and computing machine 6 time too far away, carry out wireless telecommunications, except connecting computing machine 6 with industrial computer 3 to realize except the control to industrial computer 3, the visibility result that industrial computer 3 can also be calculated passes computing machine 6 back, or the image/video etc. that industrial computer 3 collects is passed back computing machine 6.Wireless module supports double frequency GSM/GPRS, supports that PC sends SMS message (SMS), low in energy consumption, easy to use, flexible, reliable.
Temperature Humidity Sensor, is arranged at constant temperature shooting hood inside and outside, gathers the temperature inside and outside constant temperature shooting hood and humidity, it is connected with the USB port of industrial computer 3, because it is for the humiture inside and outside acquisition camera cover, is therefore two covers, is placed in hood respectively inside and outside.
Lightning protection device, is responsible for, when thunderstorm weather, unnecessary electric current is caused underground.
Air switch, is responsible for protecting circuit (heavy overload, under-voltage etc.).
Universal joint, when fixed-direction is measured desirable generation digital tripod head 5, direction no longer changes after determining, be connected with mounting platform bottom universal joint, can left rotation and right rotation, universal joint side is adjustable industrial camera 4 is to new line or bow, and universal joint top and constant temperature are made a video recording bottom hood and is connected, the front and back position of adjustable industrial camera 4.
External equipment protective device; there is provided protection to the equipment of outside work and industrial computer 3, digital image pickup unit controller, digital tripod head controller, serial server, router, wireless module, lightning protection device, air switch, keep temperature humidity range by fan and well heater.
Object support, is highly four meters, and shape is truncated rectangular pyramids, end face and bottom surface are square, shrink gradually from top to bottom to provide stable support, and making material is angle steel, install a sheet metal at end face, for installation targets black matrix and target light source, load-bearing is not less than 50KG.
Specifically, the wiring of industrial camera 4 is as follows: the USB port/network interface of industrial camera 4 is connected with the USB port/network interface of industrial computer 3 by USB line/netting twine, and the power lead of industrial camera 4 connects 220V power supply, and the control line of industrial camera 4 connects digital tripod head 5.
Specifically, the wiring of digital tripod head 5 is as follows: the power lead of digital tripod head 5 connects 220V power supply, and the control line of digital tripod head 5 connects serial server.
Specifically, the wiring of platform-lens controller is as follows: the control line one termination serial server of platform-lens controller, another termination video camera cover (controlling rain brush etc.) and industrial lens (controlling focal length, focusing, aperture etc.).
Specifically, the wiring of serial server is as follows: the RS485+ of serial server is connected with the RS485B of digital tripod head 5, and the RS485-of serial server is connected with the RS485W of digital tripod head, and serial server is connected with industrial computer 3 by netting twine.
Specifically, the wiring of router is as follows: be connected by netting twine with computing machine 6 by industrial computer 3.
Specifically, the wiring of wireless module is as follows: wireless module is connected with industrial computer 3 by USB line.
Specifically, the wiring of Temperature Humidity Sensor is as follows: Temperature Humidity Sensor is connected with industrial computer 3 by USB line.
Specifically, lightning protection and air switch are installed as follows: lightning protection device and air switch are put together side by side, entrance is all two interfaces, connect live wire and the zero line of exterior power supply respectively, then with the blister copper silk of outpacking rubber, the live wire end of lightning protection device is connected with the live wire end of air switch, the zero line side of lightning protection device is connected with the zero line side of air switch; In this section of outlet, the live wire of the two ends difference combination hub of air switch and zero line, to power to socket, the outlet of lightning protection device connects yellowish green ground wire, and ground wire directs into underground again.
Based on the measuring method of the Visibility Measures System of digital camera method, step is as follows:
One, object is built by rack rod;
Two, industrial camera 4 sends the image comprising object to industrial computer 3;
Three, by the mode that network remote logs in, computing machine 6 is utilized to operate industrial computer 3;
Four, according to image, industrial camera 4 and industrial lens are adjusted, make the imaging of object reach optimum efficiency;
Five, object and object of reference around thereof are demarcated;
Six, atmospheric visibility is obtained according to visibility computing formula;
Industrial computer 3 at set intervals, sends visibility and the data such as temperature, humidity to computing machine 6, reaches the visibility measurement of round-the-clock 24 hours.
Above-mentioned example is used for explaining and the present invention is described, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, makes any amendment and change, all fall into protection scope of the present invention to the present invention.
Under above-mentioned instruction of the present invention; those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment; and these improve and distortion; all drop in protection scope of the present invention; those skilled in the art should be understood that; above-mentioned specific descriptions just explain object of the present invention better, and protection scope of the present invention is by claim and equivalents thereof.
Claims (9)
1., based on the Visibility Measures System of digital camera method, it comprises:
Bracing or strutting arrangement, it utilizes universal joint to carry digital image pickup unit, and described universal joint direction no longer changes after determining, is connected bottom universal joint with mounting platform,
Digital image pickup unit, it is for taking selected object and captured object image being outputted to graphics processing unit, and wherein, described object comprises as the target black matrix detecting more than 2 or 2 daytime and 2 target light source detected as night; Described 2 target light source are 2 independently LED lattice array luminous plaques;
Graphics processing unit, the object image that it obtains the shooting by above-mentioned digital image pickup unit uses target location algorithm to carry out accurate localizing objects thing, extracts the brightness value of this object and outputs to visibility computing unit;
Visibility computing unit, it is according to the brightness value of the above-mentioned object image extracted by above-mentioned graphics processing unit, use dual differential luminance contrast equation, calculate visibility value, and the arithmetic mean obtaining above-mentioned object all directions visibility value is as current visibility;
Control module, comprises digital image pickup unit controller, and it is large/little to the camera lens zoom of digital image pickup unit, it is far away/near to focus on, aperture ON/OFF controls;
Network connection unit, comprise the serial server be connected with graphics processing unit, it is as Communication Interface Converter; And, computing machine; And router, is responsible for building the LAN (Local Area Network) connecting graphics processing unit and computing machine;
Equipment protection unit, comprises outdoor equipment protective device, and this outdoor equipment protective device has multi-layer sealed heat insulating construction, holds and needs the equipment of outside work and carry out humiture protection to it.
2., as claimed in claim 1 based on the Visibility Measures System of digital camera method, it is characterized in that,
Described digital image pickup unit also comprises PWM modular converter, uses described PWM modular converter to control the overall brightness of all LED in described LED lattice array luminous plaque.
3., as claimed in claim 1 based on the Visibility Measures System of digital camera method, it is characterized in that,
Described digital image pickup unit also comprises PWM modular converter, uses described PWM modular converter to control the brightness of each LED respectively.
4., as claimed in claim 3 based on the Visibility Measures System of digital camera method, it is characterized in that,
Described PWM modular converter comprises routing submodule, and described routing submodule for selecting specific LED, thus controls by the brightness of the LED selected.
5. the Visibility Measures System based on digital camera method according to any one of claim 2-4, is characterized in that,
Described PWM modular converter also comprises brightness ratio and regulates submodule, and described brightness ratio regulates submodule for regulating the overall brightness of one of them LED lattice array luminous plaque, to make it equal or proportional with the overall brightness of another LED lattice array luminous plaque.
6., as claimed in claim 5 based on the Visibility Measures System of digital camera method, it is characterized in that,
The overall brightness of the LED lattice array luminous plaque be conditioned be through softbox after overall brightness, or the overall brightness before softbox.
7., as claimed in claim 1 based on the Visibility Measures System of digital camera method, it is characterized in that,
Described digital image pickup unit also comprises 2 softbox, and the light source that each LED lattice array luminous plaque sends is converted into the area source of brightness uniformity before being placed in corresponding LED lattice array luminous plaque by each softbox.
8., as claimed in claim 1 based on the Visibility Measures System of digital camera method, it is characterized in that,
Each LED lattice array luminous plaque is all placed on the optional position in rear 1/2nd of depth direction in a rectangular parallelepiped.
9. utilize a method for the Visibility Measures System based on digital camera method described in claim 1, it is characterized in that, comprise the following steps:
One, object is built; Universal joint is utilized to carry digital image pickup unit, described universal joint direction no longer changes after determining, be connected with mounting platform bottom universal joint, can left rotation and right rotation, universal joint side is adjustable industrial camera is to coming back or bowing, and universal joint top and constant temperature are made a video recording bottom hood and is connected, the front and back position of adjustable industrial camera, wherein, described object comprises as the target black matrix detecting more than 2 or 2 daytime and 2 target light source detected as night; Described 2 target light source are 2 independently LED lattice array luminous plaques;
Two, the object that shooting in digital image pickup unit interval N minute is selected, and send the image comprising object to graphics processing unit;
Three, by the mode that network remote logs in, utilize computer operation digital image pickup unit controller large/little to camera lens zoom, focus on far away/near, aperture ON/OFF and adjust, make the imaging of object reach optimum efficiency;
Four, object and object of reference around thereof are demarcated: use target location algorithm accurately locate the object of above-mentioned object image and extract the brightness value of this object;
Five, atmospheric visibility is obtained according to visibility computing formula: by Bi-objective dual differential luminance contrast algorithm
Calculate all directions visibility value of above-mentioned object, and obtain the arithmetic mean of this all directions visibility value
Average is as current visibility value.
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| CN106018402A (en) * | 2016-04-26 | 2016-10-12 | 中国人民解放军理工大学 | Visibility detection system and method with unmanned aerial vehicle-mounted catadioptric panoramic stereo camera |
| CN106210061A (en) * | 2016-07-14 | 2016-12-07 | 桂林长海发展有限责任公司 | A kind of automatic recognition system of undercarriage folding and unfolding |
| CN107907506A (en) * | 2017-11-08 | 2018-04-13 | 华东师范大学 | A kind of measuring device and method of wide-range and dynamic optimum resolution measurement silt content |
| CN108181307A (en) * | 2017-12-06 | 2018-06-19 | 中国气象局北京城市气象研究所 | A kind of Visibility Measures System and method |
| CN113916841A (en) * | 2021-11-12 | 2022-01-11 | 北京聚恒博联科技有限公司 | Transmission-type visibility meter based on surface light source emission and array reception |
| CN114280056A (en) * | 2021-12-20 | 2022-04-05 | 北京普测时空科技有限公司 | Visibility measurement system |
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| CN113916841A (en) * | 2021-11-12 | 2022-01-11 | 北京聚恒博联科技有限公司 | Transmission-type visibility meter based on surface light source emission and array reception |
| CN113916841B (en) * | 2021-11-12 | 2024-01-12 | 北京聚恒博联科技有限公司 | Transmission type visibility meter based on surface light source emission and area array reception |
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