CN106506078B - A kind of visible light communication car light intercommunication method with License Plate - Google Patents
A kind of visible light communication car light intercommunication method with License Plate Download PDFInfo
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- CN106506078B CN106506078B CN201610953337.3A CN201610953337A CN106506078B CN 106506078 B CN106506078 B CN 106506078B CN 201610953337 A CN201610953337 A CN 201610953337A CN 106506078 B CN106506078 B CN 106506078B
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- 238000004891 communication Methods 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000003384 imaging method Methods 0.000 claims abstract description 20
- 108091008695 photoreceptors Proteins 0.000 claims description 34
- 210000001624 hip Anatomy 0.000 claims description 12
- 238000012790 confirmation Methods 0.000 claims description 10
- 230000001360 synchronised effect Effects 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000002146 bilateral effect Effects 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000005236 sound signal Effects 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims 1
- 230000003993 interaction Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000005611 electricity Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/114—Indoor or close-range type systems
- H04B10/116—Visible light communication
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V20/00—Scenes; Scene-specific elements
- G06V20/60—Type of objects
- G06V20/62—Text, e.g. of license plates, overlay texts or captions on TV images
Abstract
The visible light communication car light intercommunication method with License Plate that the invention discloses a kind of.A kind of visible light communication car light talkback unit, including preposition transceiver, postposition transceiver and user interface are set；When two cars carry out intercommunication, the transceiver of this vehicle is communicated with the transceiver of opponent vehicle；The visible light communication signal of talkback unit is sent as a data frame；When device communicates, the position for determining intercommunication license plate is searched for by device, and thus position the position of its visible light communication car light.The method of the present invention, using visible light communication technology and Image Acquisition, identification technology, realize identifying and positioning for license plate, and combine License Plate, the quickly position of positioning vehicle car light, using the combination of imaging technique and non-imaged technology, to improve the stability and accuracy of visible light communication, to carry out the speech talkback between vehicle with visible light communication technology under complicated traffic environment.
Description
Technical field
The invention belongs to technical field of photo communication, especially a kind of visible light communication car light intercommunication side with License Plate
Method.
Background technique
The driver of operating motor vehicles on road, other vehicles that may require that and go together sometimes travel in the same direction with front and back
Or the vehicle of Facing Movement carries out some exchanges, and such as: tractor needs to keep speed consistent as far as possible with the vehicle of towing, simultaneously
Brake, parking；The special vehicles such as police car, ambulance need that front vehicles is prompted to slow down, avoid, keep to the side to stop in the task of execution
Vehicle etc.；For the vehicle of colleague, we can be considered is exchanged using vehicle-mounted intercommunication mode, special vehicle then pass through loudspeaker, warning lamp,
Siren etc. is reminded；
A kind of method that lamp signal, which is driver, simply to be exchanged in driving with other vehicles, using car light it is bright, go out,
The modes such as flashing prompt other driver's steerings, vehicle trouble, Emergency avoidance, adjustment long-and-short distant light etc., but the above mode
The information content that can be carried is seldom, not intuitively；In addition, nowadays universal with motor vehicle, more and more people have private car,
But it is not everyone both knows about the lamp signal for how distinguishing these flashings；
Visible light communication can be described as a kind of high speed lamp signal, and this method is carried out using the high speed amplitude modulated beams of visible light wave range
A kind of method of communication can carry out the communication such as data, voice；High speed lamp signal is realized using visible light communication technology, then it can be with
The above-mentioned these problems of very good solution；But since the vehicle travelled on road is more, light is mixed and disorderly, if it is desired on road
It realizes that visible light communication carries out intercommunication between designated vehicle, how to select, and be one to solve the problems, such as；
License plate is the unique identity of motor vehicle, and the specification of existing automotive number plate is fixed, small-sized
The preceding license plate size of license plate 440mm × 140mm of vehicle, large car are identical as small-sized license plate size, and rear board is 440mm × 220mm；
License plate requires the visibility point before and after vehicle to install；By observation, the headlamp and postposition brake lamp of motor vehicle are usually preceding
120 degree of license plate or so afterwards, apart from about 1 meter of the fan-shaped region in license plate edge；And see that one lights back by camera acquisition
Car light is a circular hot spot, the hot spot and the numerical value Jing Guo AD conversion, has a jump relative to peripheral region；
According to above-mentioned Railway Project and several technical methods, the invention proposes a kind of with the visible of License Plate
Optic communication car light intercommunication method；
Summary of the invention
The visible light communication car light intercommunication method with License Plate that the object of the present invention is to provide a kind of.
Specific steps are as follows:
(1) a kind of visible light communication car light talkback unit is set, comprising: preposition transceiver, postposition transceiver and user connect
Mouthful；Preposition transceiver, comprising: image acquisition device, image processor, photoreceptor array, decision device, preposition car light, preposition
Driving；Postposition transceiver, comprising: image acquisition device, image processor, photoreceptor array, decision device, postposition car light, after
Set driving；User interface, comprising: voice collector, speech processor, keyboard, speech player, transceiver controller, display,
Touch screen.
User interface receives and dispatches mechatronics with preposition transceiver, postposition respectively；In preposition transceiver, pre-driver is with before
Set car light electrical connection, image acquisition device be electrically connected with image processor, photoreceptor array respectively, photoreceptor array with
Decision device electrical connection；In postposition transceiver, postposition driving and postposition car light electrical connection, image acquisition device respectively with image procossing
Device, photoreceptor array electrical connection, photoreceptor array and decision device electrical connection；In user interface, transceiver controller
It is electrically connected respectively with speech processor, keyboard, speech player, display, touch screen, speech processor and voice collector electricity
Connection.
Image acquisition device is obtained obtaining image information, and is exported to image processor for acquiring real-time imaging；Preposition receipts
Hair machine is identical with the image acquisition device purposes of postposition transceiver.
Image processor, the image information for being exported according to image acquisition device, identifies the position of the license plate in image,
The position of light in license plate number and image；Preposition transceiver is identical with the image processor purposes of postposition transceiver.
Photoreceptor array, each photelectric receiver in array is all corresponding with a pixel of image acquisition device,
For incuding the visible light communication signal of pixel positonlight sending, and be converted to analog electrical signal output；Preposition transmitting-receiving
Machine is identical with the photoreceptor array purposes of postposition transceiver.
Decision device selects corresponding photelectric receiver in photoreceptor array for the instruction according to transceiver controller
Analog electrical signal output, and be converted into corresponding digital signal and export；The decision device of preposition transceiver and postposition transceiver
Purposes is identical.
Preposition car light, for sending visible light signal, preposition car light uses the headlamp of automobile.
Pre-driver, for driving preposition car light to issue visible light signal.
Postposition car light, for sending visible light communication signal, postposition car light uses clearance lamps, the brake lamp of automobile rear.
Postposition driving, for driving postposition car light to issue visible light signal；Pre-driver and postposition driving are all driving electricity
Road.
Preposition car light and postposition car light are all visible light communication car lights.
Voice collector, for obtaining phonetic control command, the speech talkback of user, and it is defeated to be converted to analog electrical signal
Out.
Analog electrical signal is converted into digital signal and exported by speech processor for handling the output of voice collector.
Keyboard, for inputting intercommunication license plate number and control instruction to device by key mode.
Touch screen, for selecting license plate number, the control instruction shown on display by clicking mode on the touchscreen,
And visible light communication on the vehicle of license plate and the license plate is selected in the real-time imaging of image acquisition device shown over the display
The position of car light.
Speech player, for the speech prompt information of playing device and the voice of intercommunication.
Display needs graph text information to be shown for display device intercommunication；Graph text information, comprising: license plate number, man-machine friendship
The real-time imaging of mutual information, image acquisition device.
Transceiver controller, for realizing: 1, the output of speech processor is handled, identifies the intercommunication of speech form
Information, license board information, command information；2, the signal output of keyboard is obtained, and according to the signal of output, determines the instruction letter of output
Breath, license board information；3, the license plate number of image processor output is received, the location information of light in the position of license plate and image,
And determine the position letter of the visible light communication car light of the position and vehicle of the vehicle license plate number and the license plate that need to establish connection
Breath；4, according to the light position information of visible light communication car light, the photelectric receiver of decision device selection corresponding pixel points is controlled, and
Receive the digital signal output of decision device；5, the digital signal output of decision device is converted into corresponding data, instruction or language
Sound signal；6, control display shows corresponding graph text information；7, control speech player plays speech prompt information and intercommunication
Voice；8, license plate database is preserved；9, the signal output of touch screen is received, and according to the signal of output, is converted into corresponding
Command information, license board information；10, according to the license plate and vehicle in the real-time imaging shown on the display that touch screen clicks
Lamp, instruction image processor preferentially identify the visible light communication car light of the license plate number and the vehicle of the license plate for communication；
11, according to speech talkback information, control information, the data frame of visible light communication is generated, and according to data frame and intercommunication vehicle
Position, to pre-driver or postposition driving issue signal, then from driving circuit driving visible light communication car light issue
Optical signal.
When front and back two cars carry out intercommunication, front truck is carried out using the postposition transceiver of this vehicle and the preposition transceiver of rear car
Communication；Rear car is communicated using the preposition transceiver of this vehicle with the postposition transceiver of front truck；When opposite two vehicles carry out intercommunication,
The preposition transceiver that two vehicles are all made of this vehicle is communicated with the preposition transceiver of opposite vehicle.
The signal of communication of visible light communication car light talkback unit is sent as a data frame, data frame include: synchronous code,
Target license plate, source license plate, data type, data length, data, check information, totally 7 fields.
Synchronous code, it is synchronous for keeping the data transmit-receive clock of two talkback units of intercommunication both sides, and indicate one
The beginning of data frame.
Target license plate, for indicating to need to carry out the opponent vehicle license plate number of intercommunication.
Source license plate, for indicating one's own side's vehicle license plate number of progress intercommunication.
Data type, for indicating the type of notebook data frame, the type of data frame includes: intercommunication request, radio voice, right
Say request-reply, the confirmation of intercommunication request-reply；Intercommunication request data frame is issued by intercommunication originating end, is responded for indicating to intercommunication
End sends the request that intercommunication is established；Intercommunication request-reply data frame is issued by intercommunication responder, for indicating to intercommunication originating end
Send the request-reply that intercommunication is established；Intercommunication request-reply confirmation data frame is issued by intercommunication originating end, is received pair for indicating
Say request-reply data frame, connection is established in confirmation；Radio voice data frame, for carrying the voice messaging that send intercommunication.
Data length, for indicating the length of data field in a data frame.
Data, for placing the voice messaging of intercommunication.
Check information, it is whether wrong for inspection data frame, the mistake occurred in transmission process is corrected.
License plate database has the address list of license plate number, there is the blacklist of license plate number.
The mode for the vehicle license plate number that connection is established in intercommunication both sides selection has 4 kinds: 1, voice inputs；2, keyboard inputs；3,
Touch-screen menus input；4, screen image input is touched.
Voice input, user give an oral account license plate number, the voice messaging of license plate number are obtained by voice collector, then by speech processes
It is output to transceiver controller after device processing, license plate number is identified by transceiver controller.
Keyboard input, user input license plate number to device by the key of keyboard.
Touch-screen menus input, user is according to the picture and text prompt information shown on display, in the phase for corresponding to touch screen
The license plate number of selection intercommunication license plate is clicked to position.
Touch screen image input, user according in the real-time imaging got by image acquisition device shown on display,
License plate, the car light of the vehicle seen in image are clicked in the relative position for corresponding to touch screen, then by transceiver controller control figure
As processor grabs the license plate in image, and identify the position of license plate number and car light.
(2) the visible light communication car light talkback unit by the setting of two sets of steps (1) is labeled as I terminal and II terminal, I terminal
It is separately mounted to II terminal on the vehicle that two need intercommunication, i.e., I terminal is mounted on the vehicle that license plate number is cp1, II terminal
It is mounted on the vehicle that license plate number is cp2；The control process of intercommunication is as follows:
Firstly, it is necessary to vehicle and II terminal that the license plate number for being mounted with I terminal is cp1 license plate number be cp2 vehicle
Between establish connection, by I terminal initiate intercommunication, specific steps are as follows:
T1, by utilize key, voice, touch screen, input need to establish connection vehicle license plate number cp2.
T2, device identify license plate number cp2, and cp2 is packed into data frame.
The number of connection is established in request using visible light communication signal by T3, the preposition car light using I terminal, postposition car light
It is sent according to frame.
T4, the preposition transceiver by I terminal, postposition transceiver search the position for obtaining the license plate of license plate number cp2.
T5, the position according to the license plate of license plate number cp2, position the position of the visible light communication car light of II terminal.
T6, after navigating to the position of visible light communication car light of II terminal, photelectric receiver that determination should be read it is visible
Optic communication signal waits the intercommunication request-reply data frame from II terminal, and carries out time-out count, into following sub-step.
T6.1 receive the intercommunication request-reply data frame from II terminal, it is determined that logical before time-out count completion
After believing that both sides' information of vehicles is errorless, opponent vehicle is locked, intercommunication request-reply is sent to II terminal and confirms data frame, and start pair
It says；Before time-out count is completed, the intercommunication request data frame from II terminal is received, then sends intercommunication request to II terminal and answers
The data frame answered waits the intercommunication request-reply sent from II terminal to confirm data frame.
If the intercommunication request-reply data frame of II terminal, intercommunication request data are not received after T6.2 time-out count is complete yet
Frame, intercommunication request-reply confirm data frame, then return to step T3, and carry out connection failure counting；If connection failure counts
Reach setting value and do not set up connection still, just stops connection, and user's connection failure is informed by voice, display.
(3) search recipient is also in addition to that can initiate to talk with as I terminal in the II terminal of intercommunication
Formula searches for reception mode, step are as follows:
R1, image information is obtained by image acquisition device acquisition real-time imaging, then is identified in image by image processor
The license plate number of all license plates and each license plate；License plate database is searched, for the license plate number in blacklist, is just directly shielded；
If it is the license plate number in unknown license plate number and address list, then enter in next step.
R2, basis search the position of the license plate of license plate number, position the position of its visible light communication car light.
R3, the visible light signal received by the position of visible light communication car light, the photelectric receiver that determination should be read；By
This search is that the visible light communication car light of which license plate has initiation intercommunication request.
R4, when initiate intercommunication request it is license plate number in address list either police car, ambulance, then is sent out to the vehicle
The data frame of intercommunication request-reply out, and the intercommunication request-reply sent from the vehicle is waited to confirm data frame, prepares to start pair
It says.
R5, when initiate intercommunication request be the no unknown license plate number of license plate database, then by voice, display inquire
Whether user agrees to establish connection；If agreed to, the data frame of intercommunication request-reply is issued to the vehicle, and wait and come from the vehicle
The intercommunication request-reply of transmission confirms data frame, prepares to start intercommunication；Conversely, then abandoning data frame, ignore intercommunication.
(4) in intercommunication both sides, will verify data frame the data frame that talkback unit receives will be carried out such as
Lower verifying:
C1, confirm whether one's own side is to answer received destinations traffic vehicle by target license plate field: if so, just carrying out subsequent
Operation；Otherwise with regard to lost data frames.
C2, confirmed by source license plate field send data frame come source vehicle, and according to if it is the license plate in address list, just
Directly return to intercommunication request-reply data frame；If it is the license plate in blacklist, data frame is just abandoned；If it is unknown vehicle
Board, just first passes through voice broadcast, display is shown, then is confirmed whether to receive by user's selection of target vehicle, if agreeing to connect
It receives and just sends intercommunication request-reply data frame, data frame is abandoned if disagreeing and receiving；If carrying out source vehicle is police car, rescue
Vehicle just directly receives data frame, and is shown by voice broadcast, display.
(5) after searching for and determining the position of a license plate, the position of its visible light communication car light, the process of positioning are positioned
It is as follows:
In the image that image acquisition device obtains, license plate long side is occupied for D1, the position for determining a license plate and the license plate
Pixel number x, license plate broadside occupy pixel number y.
D2, construction rectangular coordinate system: using two diagonal line intersection points of rectangle license plate as rectangular coordinate system origin, to pass through
Origin and the straight line for being parallel to long side are horizontal axis, and right side is horizontal axis positive direction；Be the longitudinal axis perpendicular to long side, top be the longitudinal axis just
Direction, a pixel are coordinate system length unit.
D3, construction one isosceles trapezoid: the extended line of two waists of isosceles trapezoid pass through origin, two waists respectively with right angle
The positive axis of coordinate system horizontal axis is in -60 degree and+60 degree, with the extended line of the right edge of license plate for upper bottom, on the right side of license plate
2 times of side license plate length y is height；In the isosceles trapezoid region, the car light on the right side of the license plate of the vehicle is searched in scanning from left to right.
Where the pixel that D4, a brightness value on the right side of searching from left to right jump just is predicted as light
Position controls the photelectric receiver that arbiter selects the pixel corresponding in photoreceptor array by transceiver controller
Output；Parsing data frame is attempted according to the output of decision device by transceiver controller again, if it is possible to data frame is parsed, it is just right
Data frame is verified: if the source license plate field in data frame is consistent with the license plate, it is determined that the light can for the license plate
Light-exposed communication car light issues, and receives the visible light communication signal；If data frame can not be parsed, previous step will be returned to,
Continue to search for the light in region.
D5, when determined right side light after, search again for the car light on the left of license plate, equally first construct an isosceles trapezoid:
The extended line of two waists of isosceles trapezoid pass through origin, two waists respectively with the negative semiaxis of rectangular coordinate system horizontal axis in -60 degree and+
60 degree, with the left side extended line of license plate for upper bottom, to be height apart from 2 times of license plate length y of license plate left side；In the isosceles trapezoid
In region, the car light on the left of the license plate of the vehicle is searched in scanning from right to left.
Where the pixel that D6, a brightness value on the left of searching from right to left jump just is predicted as light
Position controls the photelectric receiver that arbiter selects the pixel corresponding in photoreceptor array by transceiver controller
Output；Parsing data frame is attempted according to the output of decision device by transceiver controller again, if it is possible to data frame is parsed, it is just right
Data frame is verified, if the source license plate field in data frame is consistent with the license plate, it is determined that the light can for the license plate
Light-exposed communication car light issues, and receives the visible light communication signal；If data frame can not be parsed, previous step will be returned to,
Continue to search for the light in region.
D7, when the position in image acquisition device of bilateral light all determine after, then lock the two positions；And next
At the Image Acquisition moment of image acquisition device, search for the two positions and its adjacent pixel, brightness value whether with upper one
The acquisition moment is close, to determine light position, and parses data frame, logarithm according to the output of decision device by transceiver controller
It is verified according to frame, if the source license plate field in data frame is consistent with the license plate, it is determined that the light is the visible of the license plate
Optic communication car light issues, and receives the visible light communication signal；If causing this step can not due to blocking or other reasons
It executes, then jumps to D1 step, relocate car light.
Visible light communication car light intercommunication method with License Plate of the invention, is adopted using visible light communication technology and image
Collection, identification technology realize identifying and positioning for license plate, and combine License Plate, quickly position the position of vehicle car light, use
The combination of imaging technique and non-imaged technology, so that the stability and accuracy of visible light communication are improved, so that handing in complexity
The speech talkback between vehicle is carried out with visible light communication technology under logical environment to be possibly realized.
Detailed description of the invention
Fig. 1 is the structure chart of visible light communication car light talkback unit used in the embodiment of the present invention.
Marked in the figure: 1- user interface；The preposition transceiver of 2-；3- postposition transceiver；10- transceiver controller；11- voice is adopted
Storage；12- speech processor；13- keyboard；14- speech player；15- display；16- touch screen；20- image acquisition device；
21- image processor；22- photoreceptor array；23- decision device；The preposition car light of 24-；25- pre-driver；30- image procossing
Device；31- image acquisition device；32- decision device；33- photoreceptor array；The driving of 34- postposition；35- postposition car light.
Specific embodiment
Embodiment:
(1) a kind of visible light communication car light talkback unit is set, comprising: preposition transceiver 2, postposition transceiver 3, Yong Hujie
Mouth 1；Preposition transceiver 2, comprising: image acquisition device 20, image processor 21, photoreceptor array 22, decision device 23, preposition
Car light 24, pre-driver 25；Postposition transceiver 3, comprising: image acquisition device 31, image processor 30, photoreceptor array
33, decision device 32, postposition car light 35, postposition driving 34；User interface 1, comprising: voice collector 11, speech processor 12, key
Disk 13, speech player 14, transceiver controller 10, display 15, touch screen 16.
User interface 1 is electrically connected with preposition transceiver 2, postposition transceiver 3 respectively；In preposition transceiver 2, pre-driver
25 and preposition car light 24 be electrically connected, image acquisition device 20 is electrically connected with image processor 21, photoreceptor array 22 respectively, light
Electric receiver array 22 and decision device 23 are electrically connected；In postposition transceiver 3, postposition driving 34 and postposition car light 35 are electrically connected,
Image acquisition device 31 is electrically connected with image processor 30, photoreceptor array 33 respectively, photoreceptor array 33 and judgement
Device 32 is electrically connected；In user interface 1, transceiver controller 10 respectively with speech processor 12, keyboard 13, speech player 14,
Display 15, touch screen 16 are electrically connected, and speech processor 12 is electrically connected with voice collector 11.
Image acquisition device is obtained obtaining image information, and is exported to image processor 21 for acquiring real-time imaging；It is preposition
Transceiver 2 is identical with the image acquisition device purposes of postposition transceiver 3.
Image processor, the image information for being exported according to image acquisition device 20, identifies the position of the license plate in image
It sets, the position of light in license plate number and image；Preposition transceiver 2 is identical with the image processor purposes of postposition transceiver 3.
Photoreceptor array, each photelectric receiver in array is all corresponding with a pixel of image acquisition device,
For incuding the visible light communication signal of pixel positonlight sending, and be converted to analog electrical signal output；Preposition transmitting-receiving
Machine 2 is identical with the photoreceptor array purposes of postposition transceiver 3.
Decision device selects corresponding photelectric receiver in photoreceptor array for the instruction according to transceiver controller
Analog electrical signal output, and be converted into corresponding digital signal and export；The judgement of preposition transceiver 2 and postposition transceiver 3
Device purposes is identical.
Preposition car light 24, for sending visible light signal, preposition car light 24 uses the headlamp of automobile.
Pre-driver 25, for driving preposition car light 24 to issue visible light signal.
Postposition car light 35, for sending visible light communication signal, postposition car light uses the clearance lamps of automobile rear, brake
Lamp.
Postposition driving 34, for driving postposition car light 35 to issue visible light signal；Pre-driver 25 and postposition driving 34 are all
It is driving circuit.
Preposition car light 24 and postposition car light 35 are all visible light communication car lights.
Voice collector 11, for obtaining phonetic control command, the speech talkback of user, and it is defeated to be converted to analog electrical signal
Out.
Analog electrical signal is converted into digital signal simultaneously for handling the output of voice collector 11 by speech processor 12
Output.
Keyboard 13, for inputting intercommunication license plate number and control instruction to device by key mode.
Touch screen 16, for selecting the license plate number shown on display 15, control by clicking mode on touch screen 16
It instructs, and selection license plate is visible on the vehicle of the license plate in the real-time imaging of the image acquisition device shown on a display 15
The position of optic communication car light.
Speech player 14, for the speech prompt information of playing device and the voice of intercommunication.
Display 15 needs graph text information to be shown for display device intercommunication；Graph text information, comprising: license plate number, man-machine
The real-time imaging of interactive information, image acquisition device 11.
Transceiver controller 10, for realizing: 1, the output of speech processor 12 is handled, identifies speech form
Intercommunication information, license board information, command information；2, the signal output of keyboard 13 is obtained, and according to the signal of output, determines output
Command information, license board information；3, the license plate number of image processor output is received, in the position of license plate and image the position of light
Information, and determine the visible light communication car light of the position and vehicle of the vehicle license plate number and the license plate that need to establish connection
Location information；4, according to the light position information of visible light communication car light, the photoelectricity for controlling decision device selection corresponding pixel points is connect
Device is received, and receives the digital signal output of decision device；5, the digital signal output of decision device is converted into corresponding data, instruction
Or voice signal；6, control display shows corresponding graph text information；7, control speech player 14 plays voice prompting letter
The voice of breath and intercommunication；8, license plate database is preserved；9, the signal output of touch screen 16 is received, and according to the signal of output,
It is converted into corresponding command information, license board information；10, according to the real-time imaging shown on the display 15 that touch screen 16 clicks
In license plate and car light, instruction image processor 30 preferentially identify the license plate license plate number and the vehicle for communication can
Light-exposed communication car light；11, according to speech talkback information, control information, the data frame of visible light communication is generated, and according to data frame
And the position of intercommunication vehicle, signal is issued to pre-driver 25 or postposition driving 34, then visible light is driven by driving circuit
It communicates car light and issues visible light signal.
The signal of communication of visible light communication car light talkback unit is sent as a data frame, data frame include: synchronous code,
Target license plate, source license plate, data type, data length, data, check information, totally 7 fields.
Synchronous code, it is synchronous for keeping the data transmit-receive clock of two talkback units of intercommunication both sides, and indicate one
The beginning of data frame.
Target license plate, for indicating to need to carry out the opponent vehicle license plate number of intercommunication.
Source license plate, for indicating one's own side's vehicle license plate number of progress intercommunication.
Data type, for indicating the type of notebook data frame, the type of data frame includes: intercommunication request, radio voice, right
Say request-reply, the confirmation of intercommunication request-reply；Intercommunication request data frame is issued by intercommunication originating end, is responded for indicating to intercommunication
End sends the request that intercommunication is established；Intercommunication request-reply data frame is issued by intercommunication responder, for indicating to intercommunication originating end
Send the request-reply that intercommunication is established；Intercommunication request-reply confirmation data frame is issued by intercommunication originating end, is received pair for indicating
Say request-reply data frame, connection is established in confirmation；Radio voice data frame, for carrying the voice messaging that send intercommunication.
Data length, for indicating the length of data field in a data frame.
Data, for placing the voice messaging of intercommunication.
Check information, it is whether wrong for inspection data frame, the mistake occurred in transmission process is corrected.
The mode for the vehicle license plate number that connection is established in intercommunication both sides selection has 4 kinds: 1, voice inputs；2, keyboard inputs；3,
Touch-screen menus input；4, screen image input is touched.
Voice input, user give an oral account license plate number, the voice messaging of license plate number are obtained by voice collector, then by speech processes
It is output to transceiver controller after device processing, license plate number is identified by transceiver controller.
Keyboard input, user input license plate number to device by the key of keyboard.
Touch-screen menus input, user are corresponding to touch screen 16 according to the picture and text prompt information shown on display 15
Relative position click selection intercommunication license plate license plate number.
Screen image input is touched, user is according to the real-time imaging got by image acquisition device shown on display 15
In, license plate, the car light of the vehicle seen in image are clicked in the relative position for corresponding to touch screen 16, then by transceiver controller 10
Control image processor grabs the license plate in image, and identifies the position of license plate number and car light.
(2) license plate number is the B vehicle of capital BBBBBB, because failure can not be travelled independently, needs by license plate number to be capital
The C vehicle of CCCCCC is dragged away, and two cars need intercommunication during towing, and is kept in touch, and two sets of steps (1) are arranged
Visible light communication car light talkback unit is separately mounted on above-mentioned two motor vehicles, and license plate number is the C vehicle of capital CCCCCC preceding
Side, using the postposition transceiver of its vehicle-mounted visible light communication car light talkback unit, with B vehicle that license plate number is capital BBBBBB
Preposition transceiver is communicated, and realizes intercommunication, and the control process of intercommunication is as follows:
Firstly, it is necessary to the company of foundation between the B vehicle that license plate number is capital BBBBBB and the C vehicle that license plate number is capital CCCCCC
It connects, intercommunication, specific steps is initiated by B vehicle are as follows:
T1, the key by utilizing keyboard, input need to establish the license plate number of the C vehicle of connection: capital CCCCCC.
T2, device identify license plate number: capital CCCCCC, and capital CCCCCC is packed into data frame.
T3, the preposition car light using B vehicle are sent the data frame that connection is established in request using visible light communication signal.
T4, the preposition transceiver by B vehicle are searched and are obtained license plate number: the position of the license plate of capital CCCCCC.
T5, according to license plate number: the position of the license plate of capital CCCCCC, position C vehicle visible light communication car light position.
T6, after navigating to the position of visible light communication car light of capital CCCCCC, photelectric receiver that determination should be read can
Light-exposed signal of communication waits the intercommunication request-reply data frame from C vehicle, and carries out time-out count, into following sub-step.
T6.1 receives the intercommunication request-reply data frame from capital CCCCCC before time-out count completion, it is determined that
After communicating pair information of vehicles is errorless, opponent vehicle is locked, Xiang Jing CCCCCC sends intercommunication request-reply and confirms data frame, and opens
Beginning intercommunication；Before time-out count is completed, since capital CCCCCC also initiates intercommunication to B vehicle, and receive from capital CCCCCC's
Intercommunication request data frame then sends the data frame of intercommunication request-reply to capital CCCCCC, waits pair sent from capital CCCCCC
Say that request-reply confirms data frame.
If T6.2 does not receive intercommunication request-reply data frame, the intercommunication of capital CCCCCC before time-out count completion always
Request data frame, intercommunication request-reply confirm data frame, then return to step T3, and carry out connection failure counting；If connection
Fail count reaches setting value and does not set up connection still, just stops connection, and inform user's connection failure by voice, display.
(3) in another party of intercommunication, license plate number is the vehicle of capital CCCCCC, in addition to that can be capital BBBBBB such as license plate number
Vehicle equally initiate to talk with, be also in search reception mode, search wait capital BBBBBB send intercommunication request, step
Are as follows:
R1, image information is obtained by the image acquisition device acquisition real-time imaging installed on the C vehicle of capital CCCCCC, then by scheming
The license plate number of all license plates and each license plate in image is identified as processor；License plate database is searched, is believed for issuing
Number be the license plate number on blacklist, just directly shielding；If it is the license plate number in unknown license plate number and address list, then
Into in next step.
R2, basis search the position of the license plate of license plate number, position the position of its visible light communication car light.
R3, the visible light signal received by the position of visible light communication car light, the photelectric receiver that determination should be read；By
This search is that the visible light communication car light of which license plate has initiation intercommunication request.
R4, when receiving unwritten unknown license plate number in address list: the vehicle of capital BBBBBB initiates intercommunication request, then leads to
Cross voice, display asks the user whether to agree to establish connection；If agreed to, the data of intercommunication request-reply are issued to the vehicle
Frame, and the intercommunication request-reply for waiting the vehicle from capital BBBBBB to send confirms data frame, prepares to start intercommunication.
(4) in intercommunication both sides, will verify data frame the data frame that talkback unit receives will be carried out such as
Lower verifying:
C1, confirm whether one's own side is to answer received destinations traffic vehicle by target license plate field: if so, just carrying out subsequent
Operation；Otherwise with regard to lost data frames.
C2, confirmed by source license plate field send data frame come source vehicle, and according to if it is the license plate in address list, just
Directly return to intercommunication request-reply data frame；If it is the license plate in blacklist, data frame is just abandoned；If it is unknown vehicle
Board, just first passes through voice broadcast, display is shown, then is confirmed whether to receive by user's selection of target vehicle, if agreeing to connect
It receives and just sends intercommunication request-reply data frame, data frame is abandoned if disagreeing and receiving；If carrying out source vehicle is police car, rescue
Vehicle just directly receives data frame, and is shown by voice broadcast, display.
(5) after searching for and determining the position of a license plate, the position of its visible light communication car light, the process of positioning are positioned
It is as follows:
In the image that image acquisition device obtains, license plate long side is occupied for D1, the position for determining a license plate and the license plate
Pixel number x, license plate broadside occupy pixel number y.
D2, construction rectangular coordinate system: using two diagonal line intersection points of rectangle license plate as rectangular coordinate system origin, to pass through
Origin and the straight line for being parallel to long side are horizontal axis, and right side is horizontal axis positive direction；Be the longitudinal axis perpendicular to long side, top be the longitudinal axis just
Direction, a pixel are coordinate system length unit.
D3, construction one isosceles trapezoid: the extended line of two waists of isosceles trapezoid pass through origin, two waists respectively with right angle
The positive axis of coordinate system horizontal axis is in -60 degree and+60 degree, with the extended line of the right edge of license plate for upper bottom, on the right side of license plate
2 times of side license plate length y is height；In the isosceles trapezoid region, the car light on the right side of the license plate of the vehicle is searched in scanning from left to right.
D4, the position where the pixel that first brightness value for searching right side from left to right jumps is exactly light
It sets, the defeated of the photelectric receiver that arbiter selects the pixel corresponding in photoreceptor array is controlled by transceiver controller
Out；Parsing data frame is attempted, if it is possible to data frame is parsed, with regard to logarithm according to the output of decision device by transceiver controller again
It is verified according to frame: if the source license plate field in data frame is consistent with the license plate, it is determined that the light is the visible of the license plate
Optic communication car light issues, and receives the visible light communication signal；If data frame can not be parsed, previous step will be returned to, after
Light in continuous Search Area.
D5, when determined right side light after, search again for the car light on the left of license plate, equally first construct an isosceles trapezoid:
The extended line of two waists of isosceles trapezoid pass through origin, two waists respectively with the negative semiaxis of rectangular coordinate system horizontal axis in -60 degree and+
60 degree, with the left side extended line of license plate for upper bottom, to be height apart from 2 times of license plate length y of license plate left side；In the isosceles trapezoid
In region, the car light on the left of the license plate of the vehicle is searched in scanning from right to left.
D6, the position where the pixel that first brightness value for searching left side from right to left jumps is exactly light
It sets, the defeated of the photelectric receiver that arbiter selects the pixel corresponding in photoreceptor array is controlled by transceiver controller
Out；Parsing data frame is attempted, if it is possible to data frame is parsed, with regard to logarithm according to the output of decision device by transceiver controller again
It is verified according to frame, if the source license plate field in data frame is consistent with the license plate, it is determined that the light is the visible of the license plate
Optic communication car light issues, and receives the visible light communication signal；If data frame can not be parsed, previous step will be returned to, after
Light in continuous Search Area.
D7, when the position in image acquisition device of bilateral light all determine after, then lock the two positions；And next
At the Image Acquisition moment of image acquisition device, search for the two positions and its adjacent pixel, brightness value whether with upper one
The acquisition moment is close, to determine light position, and parses data frame, logarithm according to the output of decision device by transceiver controller
It is verified according to frame, if the source license plate field in data frame is consistent with the license plate, it is determined that the light is the visible of the license plate
Optic communication car light issues, and receives the visible light communication signal；If causing this step can not due to blocking or other reasons
It executes, then jumps to D1, relocate car light.
Claims (1)
1. a kind of visible light communication car light intercommunication method with License Plate, it is characterised in that specific steps are as follows:
(1) a kind of visible light communication car light talkback unit is set, comprising: preposition transceiver, postposition transceiver and user interface；Before
Set transceiver, comprising: image acquisition device, image processor, photoreceptor array, decision device, preposition car light, pre-driver；
Postposition transceiver, comprising: image acquisition device, image processor, photoreceptor array, decision device, postposition car light, postposition are driven
It is dynamic；User interface, comprising: voice collector, speech processor, keyboard, speech player, transceiver controller, display, touch
Screen；
User interface receives and dispatches mechatronics with preposition transceiver, postposition respectively；In preposition transceiver, pre-driver and preposition vehicle
Lamp electrical connection, image acquisition device are electrically connected with image processor, photoreceptor array respectively, photoreceptor array and judgement
Device electrical connection；In postposition transceiver, postposition driving and postposition car light electrical connection, image acquisition device respectively with image processor,
Photoreceptor array electrical connection, photoreceptor array and decision device electrical connection；In user interface, transceiver controller difference
It is electrically connected with speech processor, keyboard, speech player, display, touch screen, speech processor is electrically connected with voice collector
It connects；
Image acquisition device is obtained obtaining image information, and is exported to image processor for acquiring real-time imaging；Preposition transceiver
It is identical with the image acquisition device purposes of postposition transceiver；
Image processor, the image information for being exported according to image acquisition device, identifies the position of the license plate in image, license plate
Number and image in light position；Preposition transceiver is identical with the image processor purposes of postposition transceiver；
Photoreceptor array, each photelectric receiver in array is all corresponding with a pixel of image acquisition device, is used for
Incude the visible light communication signal of pixel positonlight sending, and is converted to analog electrical signal output；Preposition transceiver and
The photoreceptor array purposes of postposition transceiver is identical；
Decision device selects the mould of corresponding photelectric receiver in photoreceptor array for the instruction according to transceiver controller
Quasi- electric signal output, and be converted into corresponding digital signal and export；The decision device purposes of preposition transceiver and postposition transceiver
It is identical；
Preposition car light, for sending visible light signal, preposition car light uses the headlamp of automobile；
Pre-driver, for driving preposition car light to issue visible light signal；
Postposition car light, for sending visible light communication signal, postposition car light uses clearance lamps, the brake lamp of automobile rear；
Postposition driving, for driving postposition car light to issue visible light signal；Pre-driver and postposition driving are all driving circuits；
Preposition car light and postposition car light are all visible light communication car lights；
Voice collector for obtaining phonetic control command, the speech talkback of user, and is converted to analog electrical signal output；
Analog electrical signal is converted into digital signal and exported by speech processor for handling the output of voice collector；
Keyboard, for inputting intercommunication license plate number and control instruction to device by key mode；
Touch screen, for selecting license plate number, the control instruction shown on display by clicking mode on the touchscreen, and
Visible light communication car light on the vehicle of license plate and the license plate is selected in the real-time imaging of image acquisition device shown over the display
Position；
Speech player, for the speech prompt information of playing device and the voice of intercommunication；
Display needs graph text information to be shown for display device intercommunication；Graph text information, comprising: license plate number, human-computer interaction letter
The real-time imaging of breath, image acquisition device；
Transceiver controller, for realizing: 1, the output of speech processor is handled, identifies the intercommunication letter of speech form
Breath, license board information, command information；2, the signal output of keyboard is obtained, and according to the signal of output, determines the instruction letter of output
Breath, license board information；3, the license plate number of image processor output is received, the location information of light in the position of license plate and image,
And determine the position letter of the visible light communication car light of the position and vehicle of the vehicle license plate number and the license plate that need to establish connection
Breath；4, according to the light position information of visible light communication car light, the photelectric receiver of decision device selection corresponding pixel points is controlled, and
Receive the digital signal output of decision device；5, the digital signal output of decision device is converted into corresponding data, instruction or language
Sound signal；6, control display shows corresponding graph text information；7, control speech player plays speech prompt information and intercommunication
Voice；8, license plate database is preserved；9, the signal output of touch screen is received, and according to the signal of output, is converted into corresponding
Command information, license board information；10, according to the license plate and vehicle in the real-time imaging shown on the display that touch screen clicks
Lamp, instruction image processor preferentially identify the visible light communication car light of the license plate number and the vehicle of the license plate for communication；
11, according to speech talkback information, control information, the data frame of visible light communication is generated, and according to data frame and intercommunication vehicle
Position, to pre-driver or postposition driving issue signal, then from driving circuit driving visible light communication car light issue
Optical signal；
When front and back two cars carry out intercommunication, front truck is led to using the postposition transceiver of this vehicle and the preposition transceiver of rear car
Letter；Rear car is communicated using the preposition transceiver of this vehicle with the postposition transceiver of front truck；When opposite two vehicles carry out intercommunication, two
The preposition transceiver that vehicle is all made of this vehicle is communicated with the preposition transceiver of opposite vehicle；
The signal of communication of visible light communication car light talkback unit is sent as a data frame, and data frame includes: synchronous code, target
License plate, source license plate, data type, data length, data, check information, totally 7 fields；
Synchronous code, it is synchronous for keeping the data transmit-receive clock of two talkback units of intercommunication both sides, and indicate a data
The beginning of frame；
Target license plate, for indicating to need to carry out the opponent vehicle license plate number of intercommunication；
Source license plate, for indicating one's own side's vehicle license plate number of progress intercommunication；
Data type, for indicating the type of notebook data frame, the type of data frame includes: that intercommunication request, radio voice, intercommunication are asked
Ask response, the confirmation of intercommunication request-reply；Intercommunication request data frame is issued by intercommunication originating end, is sent out for indicating to intercommunication responder
The request for sending intercommunication to establish；Intercommunication request-reply data frame is issued by intercommunication responder, is sent for indicating to intercommunication originating end
The request-reply that intercommunication is established；Intercommunication request-reply confirmation data frame is issued by intercommunication originating end, for indicating that receiving intercommunication asks
Reply data frame is sought, connection is established in confirmation；Radio voice data frame, for carrying the voice messaging that send intercommunication；
Data length, for indicating the length of data field in a data frame；
Data, for placing the voice messaging of intercommunication；
Check information, it is whether wrong for inspection data frame, the mistake occurred in transmission process is corrected；
License plate database has the address list of license plate number, there is the blacklist of license plate number；
The mode for the vehicle license plate number that connection is established in intercommunication both sides selection has 4 kinds: 1, voice inputs；2, keyboard inputs；3, it touches
Shield menu input；4, screen image input is touched；
Voice input, user give an oral account license plate number, the voice messaging of license plate number are obtained by voice collector, then by speech processor
It is output to transceiver controller after reason, license plate number is identified by transceiver controller；
Keyboard input, user input license plate number to device by the key of keyboard；
Touch-screen menus input, user is according to the picture and text prompt information shown on display, in the opposite position for corresponding to touch screen
Set the license plate number for clicking selection intercommunication license plate；
Screen image input is touched, user is according in the real-time imaging got by image acquisition device shown on display, right
License plate, the car light of the vehicle seen in image should be clicked to the relative position of touch screen, then image is controlled by transceiver controller
Reason device grabs the license plate in image, and identifies the position of license plate number and car light；
(2) the visible light communication car light talkback unit by the setting of two sets of steps (1) is labeled as I terminal and II terminal, I terminal and II
Terminal is separately mounted on the vehicle that two need intercommunication, i.e., I terminal is mounted on the vehicle that license plate number is cp1, the installation of II terminal
On the vehicle that license plate number is cp2；The control process of intercommunication is as follows:
Firstly, it is necessary to vehicle and II terminal that the license plate number for being mounted with I terminal is cp1 license plate number be cp2 vehicle between
Connection is established, intercommunication, specific steps are initiated by I terminal are as follows:
T1, by utilize key, voice, touch screen, input need to establish connection vehicle license plate number cp2；
T2, device identify license plate number cp2, and cp2 is packed into data frame；
The data frame of connection is established in request using visible light communication signal by T3, the preposition car light using I terminal, postposition car light
It sends；
T4, the preposition transceiver by I terminal, postposition transceiver search the position for obtaining the license plate of license plate number cp2；
T5, the position according to the license plate of license plate number cp2, position the position of the visible light communication car light of II terminal；
T6, after navigating to the position of visible light communication car light of II terminal, the visible light of the photelectric receiver that determination should be read is logical
Believe signal, the intercommunication request-reply data frame from II terminal is waited, and carry out time-out count, into following sub-step；
T6.1 receive the intercommunication request-reply data frame from II terminal, it is determined that communication is double before time-out count completion
After square information of vehicles is errorless, opponent vehicle is locked, intercommunication request-reply is sent to II terminal and confirms data frame, and start intercommunication；
Before time-out count is completed, the intercommunication request data frame from II terminal is received, then sends intercommunication request-reply to II terminal
Data frame, wait the intercommunication request-reply confirmation data frame sent from II terminal；
If the intercommunication request-reply data frame of II terminal, intercommunication request data frame, right is not received after T6.2 time-out count is complete yet
It says that request-reply confirms data frame, then returns to step T3, and carry out connection failure counting；It is set if connection failure counting reaches
Definite value does not set up connection still, just stops connection, and inform user's connection failure by voice, display；
(3) it is also in search reception mode, is searched in addition to that can initiate to talk with as I terminal in the II terminal of intercommunication
Rope receives mode, step are as follows:
R1, image information is obtained by image acquisition device acquisition real-time imaging, then owning in image is identified by image processor
The license plate number of license plate and each license plate；License plate database is searched, for the license plate number in blacklist, is just directly shielded；If
It is the license plate number in unknown license plate number and address list, then enters in next step；
R2, basis search the position of the license plate of license plate number, position the position of its visible light communication car light；
R3, the visible light signal received by the position of visible light communication car light, the photelectric receiver that determination should be read；Thus it searches
Rope is that the visible light communication car light of which license plate has initiation intercommunication request；
R4, when initiate intercommunication request it is license plate number in address list either police car, ambulance, then is issued pair to the vehicle
It says the data frame of request-reply, and the intercommunication request-reply sent from the vehicle is waited to confirm data frame, prepare to start intercommunication；
R5, when initiate intercommunication request be the no unknown license plate number of license plate database, then by voice, display inquire user
Whether connection is established in agreement；If agreed to, the data frame of intercommunication request-reply is issued to the vehicle, and wait and sending from the vehicle
Intercommunication request-reply confirm data frame, prepare start intercommunication；Conversely, then abandoning data frame, ignore intercommunication；
(4) in intercommunication both sides, will verify data frame the data frame that talkback unit receives will be tested as follows
Card:
C1, confirm whether one's own side is to answer received destinations traffic vehicle by target license plate field: if so, just carrying out subsequent behaviour
Make；Otherwise with regard to lost data frames；
C2, confirmed by source license plate field send data frame come source vehicle, and according to if it is the license plate in address list, just directly
Return to intercommunication request-reply data frame；If it is the license plate in blacklist, data frame is just abandoned；If it is unknown license plate, just
First pass through voice broadcast, display is shown, then by target vehicle user selection be confirmed whether to receive, if agree to receive just hair
Intercommunication request-reply data frame is sent, data frame is abandoned if disagreeing and receiving；If carrying out source vehicle is police car, ambulance, just
Data frame is directly received, and is shown by voice broadcast, display；
(5) after searching for and determining the position of a license plate, the position of its visible light communication car light is positioned, the process of positioning is such as
Under:
D1, the position for determining a license plate and the license plate are in the image that image acquisition device obtains, the picture of license plate long side occupancy
Vegetarian refreshments number x, the pixel number y that license plate broadside occupies；
D2, construction rectangular coordinate system: using two diagonal line intersection points of rectangle license plate as rectangular coordinate system origin, to pass through origin
And the straight line for being parallel to long side is horizontal axis, right side is horizontal axis positive direction；It is the longitudinal axis perpendicular to long side, top is that the longitudinal axis is square
To a pixel is coordinate system length unit；
D3, construction one isosceles trapezoid: the extended line of two waists of isosceles trapezoid pass through origin, two waists respectively with rectangular co-ordinate
The positive axis for being horizontal axis is in -60 degree and+60 degree, with the extended line of the right edge of license plate for upper bottom, apart from 2 times of license plate right edge
License plate length y is height；In the isosceles trapezoid region, the car light on the right side of the license plate of the vehicle is searched in scanning from left to right；
D4, the position where the pixel that a brightness value for searching right side from left to right jumps just is predicted as light
It sets, the defeated of the photelectric receiver that arbiter selects the pixel corresponding in photoreceptor array is controlled by transceiver controller
Out；Parsing data frame is attempted, if it is possible to data frame is parsed, with regard to logarithm according to the output of decision device by transceiver controller again
It is verified according to frame: if the source license plate field in data frame is consistent with the license plate, it is determined that the light is the visible of the license plate
Optic communication car light issues, and receives the visible light communication signal；If data frame can not be parsed, previous step will be returned to, after
Light in continuous Search Area；
D5, when determined right side light after, search again for the car light on the left of license plate, equally first construct an isosceles trapezoid: isosceles
The extended line of two trapezoidal waists passes through origin, and two waists are respectively with the negative semiaxis of rectangular coordinate system horizontal axis in -60 degree and+60
Degree, with the left side extended line of license plate for upper bottom, to be height apart from 2 times of license plate length y of license plate left side；In the isosceles trapezoid area
In domain, the car light on the left of the license plate of the vehicle is searched in scanning from right to left；
D6, the position where the pixel that a brightness value for searching left side from right to left jumps just is predicted as light
It sets, the defeated of the photelectric receiver that arbiter selects the pixel corresponding in photoreceptor array is controlled by transceiver controller
Out；Parsing data frame is attempted, if it is possible to data frame is parsed, with regard to logarithm according to the output of decision device by transceiver controller again
It is verified according to frame, if the source license plate field in data frame is consistent with the license plate, it is determined that the light is the visible of the license plate
Optic communication car light issues, and receives the visible light communication signal；If data frame can not be parsed, previous step will be returned to, after
Light in continuous Search Area；
D7, when the position in image acquisition device of bilateral light all determine after, then lock the two positions；And in next image
At the Image Acquisition moment of collector, the two positions and its adjacent pixel are searched for, whether brightness value acquires with upper one
Moment is close, to determine light position, and data frame is parsed according to the output of decision device by transceiver controller, to data frame
It is verified, if the source license plate field in data frame is consistent with the license plate, it is determined that the light is that the visible light of the license plate is logical
Believe that car light issues, and receives the visible light communication signal；If causing this step that can not hold due to blocking or other reasons
Row then jumps to D1 step, relocates car light.
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| CN108528326B (en) * | 2018-04-04 | 2020-06-23 | 王小红 | Vehicle-mounted interconnection method |
| CN108616306B (en) * | 2018-04-04 | 2020-06-26 | 深圳市晟丰达科技有限公司 | Vehicle-mounted interconnection method, computer readable storage medium and vehicle-mounted terminal |
| CN108566247B (en) * | 2018-04-27 | 2020-12-04 | 杭州绿岛智能电子有限公司 | Interaction method for vehicle-mounted interconnection and intercommunication, readable storage medium and vehicle-mounted terminal |
| CN109347556A (en) * | 2018-10-30 | 2019-02-15 | 广西科技大学 | A kind of underwater communications system based on visible light |
| CN110113729A (en) * | 2019-04-30 | 2019-08-09 | 上海掌门科技有限公司 | The communication means and mobile unit of mobile unit |
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Application publication date: 20170315 Assignee: GUILIN JINYIXING TECHNOLOGY DEVELOPMENT Co.,Ltd. Assignor: GUILIN University OF TECHNOLOGY Contract record no.: X2023980044509 Denomination of invention: A visible light communication vehicle light intercom method with license plate positioning Granted publication date: 20190412 License type: Common License Record date: 20231030 |
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