CN107888288A - A kind of short distance visible light communication method and its hardware system based on mobile terminal - Google Patents
A kind of short distance visible light communication method and its hardware system based on mobile terminal Download PDFInfo
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- CN107888288A CN107888288A CN201711084454.1A CN201711084454A CN107888288A CN 107888288 A CN107888288 A CN 107888288A CN 201711084454 A CN201711084454 A CN 201711084454A CN 107888288 A CN107888288 A CN 107888288A
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- 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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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F18/00—Pattern recognition
- G06F18/20—Analysing
- G06F18/22—Matching criteria, e.g. proximity measures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/20—Image preprocessing
- G06V10/26—Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion
- G06V10/267—Segmentation of patterns in the image field; Cutting or merging of image elements to establish the pattern region, e.g. clustering-based techniques; Detection of occlusion by performing operations on regions, e.g. growing, shrinking or watersheds
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/40—Extraction of image or video features
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- 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
- H04B10/40—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
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Abstract
The invention discloses a kind of short distance visible light communication method and its hardware system based on mobile terminal, based on visible light communication technology, it is possible to achieve the short-range view data transmission of two mobile terminals, hardware system include：Mobile terminal case main body, mobile terminal camera, touch display screen, and the hardware circuit in mobile terminal case main body.Wherein, mobile terminal camera is made up of parts such as camera lens, DSP, sensors.The present invention is based on a hardware system being made up of two mobile terminals respectively as transmitter and receiver, transmitter uses digital signal processor and application image treatment technology, it is accurate to obtain visible light communication data, increase the utility function of mobile terminal in optical communications, and the efficiency of transmission of the communication means can improve with the development of mobile terminal camera, have broad application prospects.
Description
Technical field
The present invention relates to machine vision and mode identification technology, and in particular to a kind of short distance based on mobile terminal
Visible light communication method and its hardware system.
Background technology
Radio frequency line technology is widely used in wireless communication system, and its concrete application has indoor communications, mobile phone respectively
WIFI, bluetooth even earth satellite communicate.At the beginning of 21 century so far, the drastically lifting of the usage amount of mobile device result in limited
And the lasting increase of expensive radio-frequency spectrum usage amount.Until the flow of the consumption of wireless mobile apparatus in 2016 exceeded it is wired
Equipment, and in Europe, the radio frequency for common equipment has been over 500MHZ, is also possible in future higher.
Contradiction between Radio Spectrum Resource and the sharp increase of demand can not rely solely on existing frequency spectrum distribution and come
Solve, thus expedited the emergence of visible light communication technology --- the technology of LED-based brightness regulation.Meanwhile LED can realize high frequency
Communication, and the various occasions being widely used in life, in display device such as mobile phone or computer, can also adjust pixel respectively
Individual element in array recovers the information transmitted.
Present mobile terminal has had considerable ability detection information.Such as：It can be sensed with CMOS camera
Device catches the data of visible light source transmission.Research for mobile terminal transmission information also continues to develop and variation：In order to
Promoting transmission rate, can be with three-color LED (red bluish-green) come coding information；LED is referred in order to position, can use and be become based on Hough
The rim detection scheme changed.
The existing research to traditional mobile terminal, it is only to rest on mobile terminal and computer or other relatively large equipment
Between information transfer, do not go deep into veritably popularization and application to everyone ground daily life in, have certain hardware limitation,
And do not alleviate the contradiction between Radio Spectrum Resource and the sharp increase of demand well, moved to make full use of
The portability of dynamic terminal and the demand for adapting to today's society people, pole, which has to compare, proposes a kind of lighter, simple movement
Visible light communication method between terminal, the hardware system of mobile terminal in itself is utilized to bigizationner, and will be in mobile terminal
On the picture that is transmitted with image procossing and pattern-recognition technical finesse, the efficiency of transmission of the system and the degree of accuracy are with setting about
The raising of machine camera quality and increase, there is good development prospect.
The content of the invention
The invention aims to solve drawbacks described above of the prior art, there is provided a kind of short distance based on mobile terminal
From visible light communication method and its hardware system, it is simple, convenient that this method is realized, passes through the camera between two mobile terminals
The visible light communication in short distance is realized with screen.
According to disclosed embodiment, the first aspect of the present invention discloses a kind of short distance visible ray based on mobile terminal
Communication means, described short distance visible light communication method comprise the following steps：
S1, a mobile terminal form the hardware of a visible light communication as transmitter and another mobile terminal as receiver
System；
S2, transmitter pilot signal transmitted and after successfully being detected by receiver, transmitter and receiver establish synchronization link；
Numerical data is generated data image by S3, transmitter by binary data stream, is periodically passed to receiver
Transmission of data image；
The camera that S4, receiver are carried in dynamic environment with it catches the number that the transmitter in field of view of receiver is sent
According to image, identification data image is detected, completes the synchronous transfer of visible data.
Further, described step S3 is specific as follows：
S301, the numerical data of incoming sender is converted into corresponding binary stream, if the data of input flow through
It is long, first it is divided into smaller data flow reconvert binary stream；
S302, by every a string of binary streams create into the data image being made up of multiple cells, wherein each cell
Comprising multiple pixels, the pixel in same unit lattice is allocated identical gray level；
S303, the degree of excursion according to transmitter and receiver, transmitter is by being shown in data image on screen, the cycle
Property to receiver transmit data image.
Further, the method that every a string of binary streams are distributed by cell pixel is created in described step S302
Into the data image being made up of multiple cells, wherein, the method for described cell pixel distribution is using binary cells lattice, ash
Spend cell or three primary colors cell.
Further, described degree of excursion includes inclined degree and the anglec of rotation, wherein, the inclination of transmitter or receiver
Degree section is【0 °, 75 °】.
Further, described step S4 is specific as follows：
The image of a width width in S401, the continuous FOV of acquisition of receiver camera, and know from the image comprising background
Data image is not partitioned into, using the characteristic point in rapid robust feature algorithm extraction image, key point is obtained, calculates key point
The description factor, the key point relatively matched by Euclidean distance；
S402, the key point for matching to obtain with previous step calculate projective transform matrix, then the data with reception machine testing
Image array divided by projective transform matrix, data image matrix of the obtained matrix of consequence as new reception machine testing；
S403, the dynamic threshold T with maximum kind differences method calculating image, complete to carry out the data image for receiving machine testing
The operation of binaryzation；
S404, receiver carry out quantification treatment to the data image after binaryzation, obtain the number of final reception machine testing
According to image.
Further, the message transmission rate of described short distance visible light communication method is as follows:
R=(FPS-1) × M × N × log2K
Wherein, FPS is picture transmission frame number per second, and M × N is the data image size of generation, and K is the institute in data encoding
The number of colors used.
According to disclosed embodiment, the second aspect of the present invention discloses a kind of short distance visible ray based on mobile terminal
The hardware system of communication means, described hardware system include the mobile terminal as transmitter and the mobile end as receiver
End, wherein, described mobile terminal includes mobile terminal case main body, mobile terminal camera, touch display screen, and is arranged on
Hardware circuit in mobile terminal case main body；
Described mobile terminal case main body includes side press-key, and described side press-key and described touch display screen are led to
Cross described hardware circuit and realize electrical connection, can be used to control mobile terminal camera to catch image.
Further, described mobile terminal camera includes camera lens, A/D converter, DSP, sensor, receiver and hair
Machine is sent to control mobile terminal camera soft by the side press-key of described touch display screen or described mobile terminal case main body
Part function sends photographing signals, and with the scenery in described lens shooting field of view of receiver and the optical imagery of generation is projected into institute
On the sensor stated, then the analog signal of image is converted into by data signal by described A/D converter, described DSP is again
Data signal is processed, using image Segmentation Technology, is partitioned into the only pixel containing data image.
Further, described hardware circuit includes electronic operation processor, can be to the number after being handled by camera DSP
Word signal carries out image procossing again.
The present invention is had the following advantages relative to prior art and effect：
1st, the present invention proposes a kind of short distance visible light communication method based on mobile terminal, and implementation method is simple, does not have
There are hardware limitation and software limitation, only can be formed by hardware system with two mobile terminals, and transmit accuracy rate highest
Up to 98%, there is very strong practical application effect.
2nd, the wireless optical data transmission method of unlimited optical communication technique has been used in combination in the present invention, by by data stream
For image, and it is displayed on the screen of transmitter, receiver is by camera capture images, and application image processing skill
Art, with the detection image of processing capture the methods of rapid robust feature algorithm and maximum kind differences method, improve the accuracy rate of transmission
And efficiency, realize short distance visible light communication of the mobile terminal in unlimited optical communication field.
Brief description of the drawings
Fig. 1 is the hardware system schematic diagram of the short distance visible light communication method based on mobile terminal；
Fig. 2 is the model schematic that camera obtains image using sensor；
Fig. 3 is the schematic flow sheet of transmitter in visible light communication system；
Fig. 4 is the schematic flow sheet of receiver in visible light communication system；
Fig. 5 is to quantify front and rear image schematic diagram.
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art
The every other embodiment obtained under the premise of creative work is not made, belongs to the scope of protection of the invention.
Embodiment one
Present embodiment discloses a kind of short distance visible light communication method based on mobile terminal, wherein, described movement
Terminal includes mobile phone, notebook computer, tablet personal computer and palm equipment for surfing the net, multimedia equipment, stream media equipment, mobile interchange
Net equipment (MID, mobile internet device), wearable device or other kinds of terminal device.
Described visible light communication method comprises the following steps：
S1, a visible ray formed by two parts not mobile terminal as transmitter and the mobile terminal as receiver
The hardware system of communication.
S2, detect data image exactly in order to ensure transmitter, detection frame (i.e. pilot tone known to transmitter and receiver
Signal) show first, thereafter again with volume of data image.
S3, transmitter generation data image, and it is included on the screen of transmitter, receive machine testing to reduce
Difficulty, the data image only have black-and-white two color, are easy to distinguish with background.
The step S3 comprises the following steps：
S301, the numerical data of incoming sender are converted into corresponding binary stream, if the data flow of input is long,
First it is divided into smaller data flow reconvert binary stream.
S302, every a string of binary streams are used to create the image being made up of multiple cells, wherein each cell includes
Multiple pixels.Pixel in same unit lattice is allocated identical gray level.
There is the method for three kinds of cell pixel distribution：
(1) binary cells lattice；(2), gray shade unit lattice (3) three primary colors (RGB) cell.
S303, the degree of excursion according to transmitter and receiver, including inclined degree and the anglec of rotation, wherein, transmitter or
The inclined degree section of receiver is【0 °, 75 °】, transmitter is by being shown in data image on screen, periodically to connecing
Receipts machine transmits data image.
The camera that S4, receiver are carried in dynamic environment with it catches the number that the transmitter in field of view of receiver is sent
According to image, identification data image is detected, completes the synchronous transfer of visible data.
The step S4 is comprised the steps of：
The image of a width width in S401, the continuous FOV of acquisition of receiver camera, and know from the image comprising background
Data image is not partitioned into it.Using the characteristic point in rapid robust feature algorithm extraction image, key point is obtained, calculates key point
The description factor, the key point relatively matched by Euclidean distance.
S402, the key point for matching to obtain with previous step calculate projective transform matrix, then the data with reception machine testing
Image array divided by projective transform matrix, data image matrix of the obtained matrix of consequence as new reception machine testing.
S403, the dynamic threshold T with maximum kind differences method calculating image, complete to carry out the data image for receiving machine testing
The operation of binaryzation.
S404, receiver carry out quantification treatment to the data image after binaryzation, obtain the number of final reception machine testing
According to image.
The short distance visible light communication method based on mobile terminal, its message transmission rate according to disclosed in the present embodiment:
R=(FPS-1) × M × N × log2K
Wherein, FPS is picture transmission frame number per second, and M × N is the data image size of generation, and K is the institute in data encoding
The number of colors used, it is known that, if with three primary colors (R, G, B) cell, transmission rate can be higher, and this transmission method has very
Big application space and value.
Embodiment two
Present embodiment discloses a kind of hardware system of the short distance visible light communication method based on mobile terminal, including make
Mobile terminal for transmitter and the mobile terminal as receiver, wherein, described mobile terminal includes mobile terminal case
Main body, mobile terminal camera, touch display screen, and the hardware circuit in mobile terminal case main body, such as Fig. 1 institutes
Show, the hardware system does not have any hardware limitation and peripheral hardware requirement, it is thus only necessary to which two parts are not as transmitter and receiver
Mobile terminal, and be greatly enhanced by signal transmission and image processing techniques, portability and application.Described mobile end
End housing main body includes side press-key, described side press-key and described touch display screen and realized by described hardware circuit
Electrical connection, it can be used to control mobile terminal camera to catch image.
As shown in Fig. 2 described mobile terminal camera includes the composition portions such as camera lens, A/D converter, DSP, sensor
Part, receiver and transmitter are controlled by the side press-key of described touch display screen or described mobile terminal case main body and moved
Dynamic terminal camera software function sends photographing signals, is thrown with the scenery in lens shooting field of view of receiver and by the optical imagery of generation
It is mapped on sensor, then the analog signal of image is converted into by data signal by A/D converter, DSP enters to data signal again
Row working process, using image Segmentation Technology, it is partitioned into the only pixel containing data image.
Described hardware circuit includes the functional modules such as electronic operation processor, can to by camera DSP handle after
Data signal carries out image procossing again.
In order to ensure receiver detects data image exactly, detection frame (the i.e. pilot tone as known to transmitter and receiver
Signal) show first, then followed by volume of data image.
As shown in figure 3, the numerical data of incoming sender is converted into corresponding binary stream, if data flow is long,
Smaller data flow is first divided into, is used to create the image being made up of multiple cells per burst of data stream, wherein each cell
Include multiple pixels.Pixel in same unit lattice is allocated identical gray level, and the pixel value in cell is not 0 to be exactly
0 and 1 in 255 difference corresponding data streams.
The degree of excursion of transmitter and receiver, including inclined degree and the anglec of rotation are adjusted, notices that adjusting inclined degree exists
In the range of 0 ° -75 °, transmitter periodically transmits data image by the way that data image is shown on screen to receiver.
An as shown in figure 4, secondary secondary image and from the image comprising background in the continuous FOV of acquisition of receiver camera
Middle detection identifies and is partitioned into data image.
Using the characteristic point in rapid robust feature algorithm extraction image, obtain key point, calculate the description of key point because
Son, the key point relatively matched with Euclidean distance.Projective transform matrix is calculated with the key point of obtained matching, then uses this
When the data image matrix divided by projective transform matrix that detect, the datagram that obtained matrix of consequence receives as new receiver
As matrix.
The dynamic threshold T of image is calculated with maximum kind differences method, completes to carry out binaryzation to the data image that RX is received
Operation.
As shown in figure 5, carrying out quantification treatment to the image after binaryzation, the data image that final RX is received is obtained.
In summary, the hardware system of the short distance visible light communication method based on mobile terminal disclosed in the present embodiment,
Based on visible light communication technology, it is possible to achieve the short-range view data transmission of two mobile terminals, hardware system include：It is mobile
Terminal enclosure main body, mobile terminal camera, touch display screen, and the hardware circuit in mobile terminal case main body.
Wherein, mobile terminal case main body is made up of its side press-key and touch display screen, for controlling camera to complete image capture
Action；Mobile terminal camera is made up of parts such as camera lens, DSP, sensors, and lens shooting scenery throws the optical imagery of generation
It is mapped on sensor, A/D converter is responsible for the analog signal processing on sensor into data signal, and DSP is again to data signal
Further processing；The hardware circuit includes the functional modules such as electronic operation processor, can to by camera DSP handle after
Data signal is further handled, the algorithm of operation image processing and pattern-recognition.The present invention is based on by two mobile terminals point
The hardware system not formed as transmitter and receiver, transmitter are handled using digital signal processor and application image
Algorithm, visible light communication data is accurately obtained, increase the utility function of mobile terminal in optical communications, and the communication means
Efficiency of transmission can be improved with the development of mobile phone camera, have broad application prospects.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (9)
- A kind of 1. short distance visible light communication method based on mobile terminal, it is characterised in that described short distance visible ray leads to Letter method comprises the following steps：S1, a mobile terminal form the hardware system of a visible light communication as transmitter and another mobile terminal as receiver System；S2, transmitter pilot signal transmitted and after successfully being detected by receiver, transmitter and receiver establish synchronization link；Numerical data is generated data image by S3, transmitter by binary data stream, periodically transmits number to receiver According to image；The camera that S4, receiver are carried in dynamic environment with it catches the datagram that the transmitter in field of view of receiver is sent Picture, identification data image is detected, complete the synchronous transfer of visible data.
- A kind of 2. short distance visible light communication method based on mobile terminal according to claim 1, it is characterised in that institute The step S3 stated is specific as follows：S301, the numerical data of incoming sender is converted into corresponding binary stream, if the data flow of input is long, first It is divided into smaller data flow reconvert binary stream；S302, by every a string of binary streams create into the data image being made up of multiple cells, wherein each cell includes Multiple pixels, the pixel in same unit lattice are allocated identical gray level；S303, the degree of excursion according to transmitter and receiver, transmitter is by being shown in data image on screen, periodically Data image is transmitted to receiver.
- A kind of 3. short distance visible light communication method based on mobile terminal according to claim 1, it is characterised in that institute The method that every a string of binary streams are distributed by cell pixel is created into by multiple cells in the step S302 stated and formed Data image, wherein, described cell pixel distribution method use binary cells lattice, gray shade unit lattice or three primary colors list First lattice.
- A kind of 4. short distance visible light communication method based on mobile terminal according to claim 1, it is characterised in that institute The degree of excursion stated includes inclined degree and the anglec of rotation, wherein, the inclined degree section of transmitter or receiver is【0 °, 75 °】.
- A kind of 5. short distance visible light communication method based on mobile terminal according to claim 1, it is characterised in that institute The step S4 stated is specific as follows：The image of a width width in S401, the continuous FOV of acquisition of receiver camera, and the identification point from the image comprising background Data image is cut out, using the characteristic point in rapid robust feature algorithm extraction image, key point is obtained, calculates retouching for key point The factor is stated, the key point relatively matched by Euclidean distance；S402, the key point for matching to obtain with previous step calculate projective transform matrix, then the data image with reception machine testing Matrix divided by projective transform matrix, data image matrix of the obtained matrix of consequence as new reception machine testing；S403, the dynamic threshold T with maximum kind differences method calculating image, complete to carry out two-value to the data image for receiving machine testing The operation of change；S404, receiver carry out quantification treatment to the data image after binaryzation, obtain the datagram of final reception machine testing Picture.
- A kind of 6. short distance visible light communication method based on mobile terminal according to claim 1, it is characterised in that institute The message transmission rate for the short distance visible light communication method stated is as follows:R=(FPS-1) × M × N × log2KWherein, FPS is picture transmission frame number per second, and M × N is the data image size of generation, and K is used in data encoding Number of colors.
- A kind of 7. hardware system of the short distance visible light communication method based on mobile terminal, it is characterised in that described hardware System includes the mobile terminal as transmitter and the mobile terminal as receiver, wherein, described mobile terminal includes moving Dynamic terminal enclosure main body, mobile terminal camera, touch display screen, and the hardware electricity in mobile terminal case main body Road；Described mobile terminal case main body includes side press-key, and described side press-key and described touch display screen pass through institute The hardware circuit stated realizes electrical connection, can be used to control mobile terminal camera to catch image.
- 8. a kind of hardware system of short distance visible light communication method based on mobile terminal according to claim 7, its It is characterised by, described mobile terminal camera includes camera lens, A/D converter, DSP, sensor, and receiver and transmitter pass through Described touch display screen or the side press-key control mobile terminal camera software function hair of described mobile terminal case main body Go out photographing signals, described sensing is projected with the scenery in described lens shooting field of view of receiver and by the optical imagery of generation On device, then the analog signal of image is converted into by data signal by described A/D converter, described DSP is believed numeral again Number it is processed, using image Segmentation Technology, is partitioned into the only pixel containing data image.
- 9. a kind of hardware system of short distance visible light communication method based on mobile terminal according to claim 7, its It is characterised by, described hardware circuit includes electronic operation processor, can be to the data signal after being handled by camera DSP again Carry out image procossing.
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