CN105187797B - A kind of visual light imaging communication means and device - Google Patents
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Abstract
The invention discloses a kind of visual light imaging communication means and devices, and the image for carrying information to be transmitted is divided into N number of subinterval, and the part information to be transmitted is carried in each subinterval；N is the positive integer more than or equal to 1；According to default coding rule by the information MAP to be transmitted be one group of space encoding；The part information to be transmitted carried in each subinterval in N number of subinterval respectively is modulated according to one group of space encoding, modulated image is generated and shows.By the design of space encoding by the sufficient discretization of information to be transmitted, the part information to be transmitted carried in each subinterval is modulated transmission using whole image, it can ensure the integrality of information transmission to be transmitted, and the modulation of the part information to be transmitted carried in each subinterval is overlapped mutually on the entire image, so that the distribution of modulate intensity on the entire image is more uniform, so as to reduce the influence of visual effect.
Description
Technical field
The present invention relates to technical field of visible light communication, more specifically, being to be related to a kind of visual light imaging communication means
And device.
Background technology
Visible light signal is a kind of carrier for realizing communication, during communication is realized, passes through photophore (e.g., LED
Light source) and photoreceptor sent and received.Therefore, it is the break-make using photophore when transmitting information using visible light signal
Variation (can intuitivism apprehension for flicker) carrying information, photoreceptor judge photophore by perceiving the light-inletting quantity of a period of time
Rule is flickered, so as to fulfill communication.Existing visible light communication is mostly based on single LED light source and is sent, with single-point light intensity
The photoreceptor of detection is received.
One kind that visual light imaging communicates as visible light communication, during communication is realized, by existing aobvious
Display screen equipment (e.g., computer display screen, flat panel TV, outdoor advertisement screen etc.) is sent, and is passed through and can be carried out entire image
The imaging device (e.g., digital camera, cell-phone camera head etc.) of acquisition is received.So each pixel of sending device
It is considered as an arbitrary source, each imaging pixel of receiving device can be considered a receiving unit, and sending device is sent out every time
What is sent is piece image (rather than brightness of single-point), and receiving device equally collects piece image (nor single-point is bright
Degree).
Visual light imaging communication of the prior art uses transmission of the division image-region into row information more, still, this
Transmission mode will hinder the transmission of the corresponding information of the image-region when some image-region is problematic.Moreover, it will be will
The information of transmission is embedded in existing display device (e.g., computer display screen, flat panel TV, outdoor advertisement screen etc.) and is sent
When, the influence of visual effect is caused to the image that display device is normally shown.
The content of the invention
In view of this, the present invention provides a kind of visual light imaging communication means and device, with overcome in the prior art by
Caused by using image-region into the transmission of row information is divided when some image-region is problematic, the image-region will be hindered
(e.g., computer is shown in the existing display device of information insertion that will be transmitted for the problem of transmission of corresponding information and reduction
Display screen, flat panel TV, outdoor advertisement screen when) in sent when, vision is caused to the image that display device is normally shown
The influence of effect.
To achieve the above object, the present invention provides following technical solution：
A kind of visual light imaging communication means, the described method includes：
The image for carrying information to be transmitted is divided into N number of subinterval, carries described in part and treats in each subinterval
The information of transmission；N is the positive integer more than or equal to 1；
According to default coding rule by the information MAP to be transmitted be one group of space encoding；
The part carried in each subinterval in N number of subinterval is treated respectively according to one group of space encoding
Transmission information is modulated, and is generated modulated image and is shown.
Optionally, the information to be transmitted includes M transmission information unit, then, described to be advised according to default coding
Then the information MAP to be transmitted is specifically included for one group of space encoding：
It determines the modulate intensity in N number of subinterval, and a length is generated according to the modulate intensity in N number of subinterval
For the coding A=of N【A1、A2、……、AN】, wherein, ANRepresent the modulate intensity in n-th subinterval；
According to the coding A=that the length is N【A1、A2、……、AN】M transmission information unit is each mapped to one
A space encoding；
The corresponding space encoding of described M transmission information unit is formed into one group of space encoding.
Optionally, in the corresponding space encoding of M transmission information unit, the cross-correlation of any two space encoding is zero
Or close to zero.
Optionally, the transmission information unit includes any one in bit, Knight, byte.
Optionally, it is described according to one group of space encoding respectively in each subinterval in N number of subinterval
The part information to be transmitted of carrying, which is modulated, to be specifically included：
The corresponding space encoding of M transmission information unit in one group of space encoding is overlapped and is encoded
As a result；
It is to be transmitted to the part that is carried in each subinterval in N number of subinterval respectively according to the coding result
Information is modulated.
A kind of visual light imaging communication means, the described method includes：
The modulated image shown in acquisition sending device；
Acquisition testing result is detected to the visible light signal of the modulated image；
It according to default coding rule, is matched with the testing result, extracts information to be transmitted.
A kind of visual light imaging communicator, described device include：
Division unit for the image for carrying information to be transmitted to be divided into N number of subinterval, carries in each subinterval
There is the part information to be transmitted；N is the positive integer more than or equal to 1；
Map unit, for according to default coding rule by the information MAP to be transmitted be one group of space encoding；
Modulation unit, for according to one group of space encoding respectively to each subinterval in N number of subinterval
The part information to be transmitted of middle carrying is modulated, and is generated modulated image and is shown.
Optionally, the map unit is specifically used for：
It determines the modulate intensity in N number of subinterval, and a length is generated according to the modulate intensity in N number of subinterval
For the coding A=of N【A1、A2、……、AN】, wherein, ANRepresent the modulate intensity in n-th subinterval；
According to the coding A=that the length is N【A1、A2、……、AN】The M transmission that the information to be transmitted is included
Information unit is each mapped to a space encoding；
The corresponding space encoding of described M transmission information unit is formed into one group of space encoding.
Optionally, the modulation unit is specifically used for：
The corresponding space encoding of M transmission information unit in one group of space encoding is overlapped and is encoded
As a result；
According to the coding result to the part information to be transmitted that is carried in each subinterval in N number of subinterval
It is modulated.
A kind of visual light imaging communicator, described device include：
Collecting unit, for gathering the modulated image shown in sending device；
Detection unit is detected acquisition testing result for the visible light signal to the modulated image；
Extraction unit, for according to default coding rule, being matched, being extracted to be transmitted with the testing result
Information.
It can be seen via above technical scheme that compared with prior art, the invention discloses a kind of communications of visual light imaging
The image for carrying information to be transmitted is divided into N number of subinterval, is carried in each subinterval described in part by method and device
Information to be transmitted；N is the positive integer more than or equal to 1；It is by the information MAP to be transmitted according to default coding rule
One group of space encoding；According to one group of space encoding to carrying in each subinterval in N number of subinterval respectively
Part information to be transmitted is modulated, and is generated modulated image and is shown.By the design of space encoding by information to be transmitted
Sufficient discretization, the part information to be transmitted carried in each subinterval are modulated transmission using whole image, can
Ensure the integrality of information to be transmitted transmission, and the part information to be transmitted carried in each subinterval is modulated at whole image
On be overlapped mutually so that the distribution of modulate intensity on the entire image is more uniform, so as to reduce the influence of visual effect.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is a kind of idiographic flow schematic diagram of visual light imaging communication means embodiment 1 disclosed by the invention；
Fig. 2 is a kind of idiographic flow schematic diagram of visual light imaging communication means embodiment 2 disclosed by the invention；
Fig. 3 is a kind of concrete structure schematic diagram of visual light imaging communication device embodiment 1 disclosed by the invention；
Fig. 4 is a kind of concrete structure schematic diagram of visual light imaging communication device embodiment 2 disclosed by the invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
Term " first ", " second " in description and claims of this specification and above-mentioned attached drawing etc. are for distinguishing
Similar object, without being used to describe specific order or precedence.It should be appreciated that the term so used is in appropriate feelings
It can be exchanged under condition, this is only the object used differentiation in description described in the embodiment of the present invention to same alike result
Mode.In addition, term " comprising " and " having " and their any deformation, it is intended that cover it is non-exclusive include, so as to
Process, method, system, product or equipment comprising a series of units are not necessarily limited to those units, but may include unclear
Other units that ground is listed or for these processes, method, product or equipment inherently.
From background technology, visual light imaging communication of the prior art uses division image-region into row information more
Transmission, still, this transmission mode will hinder the biography of the corresponding information of the image-region when some image-region is problematic
It is defeated.Moreover, it is in the existing display device of information insertion that will be transmitted, (e.g., computer display screen, flat panel TV, open air are wide
Accuse screen when) in sent when, the influence of visual effect is caused to the image that display device is normally shown.
For this purpose, the invention discloses a kind of visual light imaging communication means and devices, the figure of information to be transmitted will be carried
As being divided into N number of subinterval, the part information to be transmitted is carried in each subinterval；N is just whole more than or equal to 1
Number；According to default coding rule by the information MAP to be transmitted be one group of space encoding；It is compiled according to one group of space
Code is modulated the part information to be transmitted carried in each subinterval in N number of subinterval respectively, generation modulation
Image afterwards and display.By the design of space encoding by the sufficient discretization of information to be transmitted, carried in each subinterval
Part information to be transmitted is modulated transmission using whole image, can ensure the integrality of information transmission to be transmitted, and every
The modulation of the part information to be transmitted carried in a subinterval is overlapped mutually on the entire image so that modulate intensity is entirely being schemed
As upper distribution is more uniform, so as to reduce the influence of visual effect.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, it is below in conjunction with the accompanying drawings and specific real
Applying mode, the present invention is described in further detail.
Attached drawing 1 is referred to, is a kind of flow diagram of visual light imaging communication means embodiment 1 disclosed by the invention,
This method is applied to sending device end, specifically comprises the following steps：
The image for carrying information to be transmitted is divided into N number of subinterval by S101.
The part information to be transmitted is carried in each subinterval, N is the positive integer more than or equal to 1.
S102, according to default coding rule by the information MAP to be transmitted be one group of space encoding.
The information to be transmitted includes M transmission information unit, then, described according to inciting somebody to action default coding rule
Information MAP to be transmitted specifically includes for one group of space encoding：
It determines the modulate intensity in N number of subinterval, and a length is generated according to the modulate intensity in N number of subinterval
For the coding A=of N【A1、A2、……、AN】, wherein, ANRepresent the modulate intensity in n-th subinterval；
According to the coding A=that the length is N【A1、A2、……、AN】M transmission information unit is each mapped to one
A space encoding；Specifically, for wherein m-th transmission information content Bm, map and obtain a space encoding Am=【A1m、
A2m、……、ANm】, i.e., by space encoding by the overall modulate intensity carrying transmission information in N number of subinterval.
The corresponding space encoding of described M transmission information unit is formed into one group of space encoding.I.e. all M transmission letters
Breath amount can map to obtain one group of space encoding A1、A2、……、AM。
It should be noted that the corresponding space encoding (A of M transmission information unit1、A2、……、AM) in, any two
The cross-correlation of space encoding is zero or near zero, i.e., is orthogonal between any two space encoding or nearly orthogonal.
The transmission information unit includes any one in bit, Knight, byte.Certainly, the transmission information content
An or information unit of any number of bit definitions.
S103, according to one group of space encoding respectively to carrying in each subinterval in N number of subinterval
Part information to be transmitted is modulated, and is generated modulated image and is shown.
It is described according to one group of space encoding portion to being carried in each subinterval in N number of subinterval respectively
Information to be transmitted is divided to be modulated to specifically include：
The corresponding space encoding of M transmission information unit in one group of space encoding is overlapped and is encoded
As a result；
It is to be transmitted to the part that is carried in each subinterval in N number of subinterval respectively according to the coding result
Information is modulated.
That is, obtain A after M space encoding is superimposedSUM=B1A1+B2A2……+BMAM, utilize ASUMIt is to be transmitted to carrying
N number of subinterval of the image of information is modulated.It should be noted that it can be realized by the visible optical parameter such as brightness, color
Modulation, i.e., it is unlimited to determine modulation system.
All subintervals of each transmission traffic utilization of space encoding permission are modulated rather than transmit information to be each
Amount is modulated from spatially dividing specific section.So as to which modulation intelligence is by the effect of space encoding, in whole image
It can abundant discretization on two-dimensional space.
Present embodiment discloses a kind of visual light imaging communication means, and the image for carrying information to be transmitted is divided into N
A subinterval carries the part information to be transmitted in each subinterval；N is the positive integer more than or equal to 1；According to default
Coding rule by the information MAP to be transmitted be one group of space encoding；According to one group of space encoding to described in difference
The part information to be transmitted carried in each subinterval in N number of subinterval is modulated, and is generated modulated image and is shown
Show.By the design of space encoding by the sufficient discretization of information to be transmitted, the part letter to be transmitted that is carried in each subinterval
Breath is modulated transmission using whole image, can ensure the integrality of information transmission to be transmitted, and is held in each subinterval
The modulation of the part information to be transmitted of load is overlapped mutually on the entire image so that the distribution of modulate intensity on the entire image is more
Add uniformly, so as to reduce the influence of visual effect.
On the basis of the above disclosed embodiments of the present invention, the invention also discloses a kind of applied to receiving device end
Visual light imaging communication means will be described in detail below by following embodiment.
Attached drawing 2 is referred to, is a kind of flow diagram of visual light imaging communication means embodiment 2 disclosed by the invention,
This method is applied to receiving device end, specifically comprises the following steps：
S201 gathers the modulated image shown in sending device.
S202 is detected acquisition testing result to the visible light signal in the modulated image.
S203 according to default coding rule, is matched with the testing result, extracts information to be transmitted.
A is can obtain specifically, being detected using the visible light signal that imaging device generates picture signal displaySUMObservation
ValueI-th of space encoding is related to imaging signal progress, it can obtain
Due toIt is a known constant, therefore the observation of available i-th of transmission information contentAnd then it can extract out every
The information of the transmission of a space encoding carrying, completes communication process.
Method is described in detail in the invention described above disclosed embodiment, diversified forms can be used for the method for the present invention
Device realize, therefore the invention also discloses a kind of device, specific embodiment is given below and is described in detail.
Attached drawing 3 is referred to, is a kind of structure diagram of visual light imaging communication device embodiment 1 disclosed by the invention,
The device is applied to sending device, and described device includes：
Division unit 11 for the image for carrying information to be transmitted to be divided into N number of subinterval, is held in each subinterval
It is loaded with the part information to be transmitted；N is the positive integer more than or equal to 1；
Map unit 12, for being compiled the information MAP to be transmitted for one group of space according to default coding rule
Code；
Modulation unit 13, for according to one group of space encoding respectively to each sub-district in N number of subinterval
Between the part information to be transmitted of middle carrying be modulated, generate modulated image and show.
Wherein, the map unit 12 is specifically used for：
It determines the modulate intensity in N number of subinterval, and a length is generated according to the modulate intensity in N number of subinterval
For the coding A=of N【A1、A2、……、AN】, wherein, ANRepresent the modulate intensity in n-th subinterval；
According to the coding A=that the length is N【A1、A2、……、AN】The M transmission that the information to be transmitted is included
Information unit is each mapped to a space encoding；
The corresponding space encoding of described M transmission information unit is formed into one group of space encoding.
The modulation unit 13 is specifically used for：
The corresponding space encoding of M transmission information unit in one group of space encoding is overlapped and is encoded
As a result；
According to the coding result to the part information to be transmitted that is carried in each subinterval in N number of subinterval
It is modulated.
It should be noted that the concrete function realization of above-mentioned unit is described in detail in embodiment of the method 1,
The present embodiment repeats no more, and specifically refers to the associated description in embodiment of the method.
Attached drawing 4 is referred to, is a kind of structure diagram of visual light imaging communication device embodiment 2 disclosed by the invention,
The device is applied to receiving device, and described device includes：
Collecting unit 21, for gathering the modulated image shown in sending device；
Detection unit 22, for being detected acquisition testing result to the visible light signal in the modulated image；
Extraction unit 23, for according to default coding rule, being matched, being extracted to be transmitted with the testing result
Information.
It should be noted that the concrete function realization of above-mentioned unit is described in detail in embodiment of the method 2,
The present embodiment repeats no more, and specifically refers to the associated description in embodiment of the method.
In summary：
The invention discloses a kind of visual light imaging communication means and devices, and the image for carrying information to be transmitted is divided
For N number of subinterval, the part information to be transmitted is carried in each subinterval；N is the positive integer more than or equal to 1；According to
The information MAP to be transmitted is one group of space encoding by default coding rule；According to one group of space encoding to respectively
The part information to be transmitted carried in each subinterval in N number of subinterval is modulated, and generates modulated image
And it shows.By the design of space encoding by the sufficient discretization of information to be transmitted, the part carried in each subinterval is to be passed
Defeated information is modulated transmission using whole image, can ensure the integrality of information transmission to be transmitted, and each subinterval
The modulation of the part information to be transmitted of middle carrying is overlapped mutually on the entire image so that point of modulate intensity on the entire image
Cloth is more uniform, so as to reduce the influence of visual effect.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is said referring to method part
It is bright.
In addition it should be noted that, the apparatus embodiments described above are merely exemplary, wherein described as separation
The unit of part description may or may not be it is physically separate, the component shown as unit can be or
It can not be physical location, you can be located at a place or can also be distributed in multiple network element.It can be according to reality
Border needs to select some or all of module therein to realize the purpose of this embodiment scheme.It is in addition, provided by the invention
In device embodiment attached drawing, the connection relation between module represents there is communication connection between them, specifically can be implemented as one
Item or a plurality of communication bus or signal wire.Those of ordinary skill in the art are without creative efforts, you can with
Understand and implement.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can borrow
Help software that the mode of required common hardware is added to realize, naturally it is also possible to include application-specific integrated circuit, specially by specialized hardware
It is realized with CPU, private memory, special components and parts etc..Under normal circumstances, all functions of being completed by computer program can
It is easily realized with corresponding hardware, moreover, for realizing that the particular hardware structure of same function can also be a variety of more
Sample, such as analog circuit, digital circuit or special circuit etc..But it is more for the purpose of the present invention in the case of software program it is real
It is now more preferably embodiment.Based on such understanding, technical scheme substantially in other words makes the prior art
The part of contribution can be embodied in the form of software product, which is stored in the storage medium that can be read
In, such as the floppy disk of computer, USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory
Device (RAM, Random Access Memory), magnetic disc or CD etc., including some instructions with so that a computer is set
Standby (can be personal computer, server or the network equipment etc.) performs the method described in each embodiment of the present invention.
In conclusion the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to upper
Embodiment is stated the present invention is described in detail, it will be understood by those of ordinary skill in the art that：It still can be to upper
The technical solution recorded in each embodiment is stated to modify or carry out equivalent substitution to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is not made to depart from the spirit and scope of various embodiments of the present invention technical solution.
Claims (4)
1. a kind of visual light imaging communication means, which is characterized in that the described method includes：
The image for carrying information to be transmitted is divided into N number of subinterval, it is described to be transmitted that part is carried in each subinterval
Information；N is the positive integer more than or equal to 1；
According to default coding rule by the information MAP to be transmitted be one group of space encoding；
It is to be transmitted to the part that is carried in each subinterval in N number of subinterval respectively according to one group of space encoding
Information is modulated, and is generated modulated image and is shown；
Wherein, the information to be transmitted includes M and transmits information unit, then, it is described according to default coding rule by institute
Information MAP to be transmitted is stated to specifically include for one group of space encoding：
Determine the modulate intensity in N number of subinterval, and it is N to generate a length according to the modulate intensity in N number of subinterval
Coding A=【A1、A2、……、AN】, wherein, ANRepresent the modulate intensity in n-th subinterval；
According to the coding A=that the length is N【A1、A2、……、AN】M transmission information unit is each mapped to a sky
Between encode；
The corresponding space encoding of described M transmission information unit is formed into one group of space encoding；
It is described that the part carried in each subinterval in N number of subinterval is treated respectively according to one group of space encoding
Transmission information, which is modulated, to be specifically included：
The corresponding space encoding of M transmission information unit in one group of space encoding is overlapped to obtain coding knot
Fruit；
According to the coding result part information to be transmitted to being carried in each subinterval in N number of subinterval respectively
It is modulated.
2. according to the method described in claim 1, it is characterized in that, in the corresponding space encoding of M transmission information unit, appoint
The cross-correlation of two spaces of anticipating coding is zero or near zero.
3. method according to claim 1 or 2, which is characterized in that it is described transmission information unit include bit, Knight,
Any one in byte.
4. a kind of visual light imaging communicator, which is characterized in that described device includes：
For the image for carrying information to be transmitted to be divided into N number of subinterval, portion is carried in each subinterval for division unit
Divide the information to be transmitted；N is the positive integer more than or equal to 1；
Map unit, for according to default coding rule by the information MAP to be transmitted be one group of space encoding；
Modulation unit, for according to one group of space encoding respectively to being held in each subinterval in N number of subinterval
The part information to be transmitted of load is modulated, and is generated modulated image and is shown；
Wherein, the map unit is specifically used for：
Determine the modulate intensity in N number of subinterval, and it is N to generate a length according to the modulate intensity in N number of subinterval
Coding A=【A1、A2、……、AN】, wherein, ANRepresent the modulate intensity in n-th subinterval；
According to the coding A=that the length is N【A1、A2、……、AN】The M transmission information that the information to be transmitted is included
Amount unit is each mapped to a space encoding；
The corresponding space encoding of described M transmission information unit is formed into one group of space encoding；
The modulation unit is specifically used for：
The corresponding space encoding of M transmission information unit in one group of space encoding is overlapped to obtain coding knot
Fruit；
The part information to be transmitted carried in each subinterval in N number of subinterval is carried out according to the coding result
Modulation.
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| CN107770552B (en) * | 2016-08-19 | 2020-05-22 | 中国人民解放军信息工程大学 | Information transmission method and device |
| CN107770404B (en) * | 2016-08-19 | 2019-12-03 | 中国人民解放军信息工程大学 | Implicit imaging communication method and apparatus based on alpha channel parameters |
| CN107786828B (en) * | 2016-08-30 | 2020-08-21 | 中国人民解放军信息工程大学 | Implicit information transmission method, device and system |
| CN107454351B (en) * | 2017-09-22 | 2019-11-01 | 深圳市光域物联科技有限公司 | Imaging communication system and method based on multicolor visible light technology |
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| CN102006120A (en) * | 2009-09-02 | 2011-04-06 | 株式会社东芝 | Method and apparatus for visible light communication |
| CN102843186A (en) * | 2011-06-23 | 2012-12-26 | 卡西欧计算机株式会社 | Information transmission system, information sending device, information receiving device, information transmission method, information sending method and information receiving method |
| CN103684598A (en) * | 2014-01-06 | 2014-03-26 | 中国人民解放军信息工程大学 | Visible light communication system |
| CN104010194A (en) * | 2014-06-12 | 2014-08-27 | 中国人民解放军信息工程大学 | Information transmission method and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102006120A (en) * | 2009-09-02 | 2011-04-06 | 株式会社东芝 | Method and apparatus for visible light communication |
| CN102843186A (en) * | 2011-06-23 | 2012-12-26 | 卡西欧计算机株式会社 | Information transmission system, information sending device, information receiving device, information transmission method, information sending method and information receiving method |
| CN103684598A (en) * | 2014-01-06 | 2014-03-26 | 中国人民解放军信息工程大学 | Visible light communication system |
| CN104010194A (en) * | 2014-06-12 | 2014-08-27 | 中国人民解放军信息工程大学 | Information transmission method and device |
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