CN107911167A - A kind of visual light imaging communication means and system - Google Patents

A kind of visual light imaging communication means and system Download PDF

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Publication number
CN107911167A
CN107911167A CN201711226598.6A CN201711226598A CN107911167A CN 107911167 A CN107911167 A CN 107911167A CN 201711226598 A CN201711226598 A CN 201711226598A CN 107911167 A CN107911167 A CN 107911167A
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mrow
msub
frame
signal
frame losing
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胡赟鹏
唐燕群
沈智翔
李明超
张效义
朱义君
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PLA Information Engineering University
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PLA Information Engineering University
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Priority to CN201711226598.6A priority Critical patent/CN107911167A/en
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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
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • 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
    • H04B10/60—Receivers

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)

Abstract

A kind of visual light imaging communication means and system are disclosed in the embodiment of the present invention, complementary modulation is carried out based on transmission signal is treated, and by the modulated signal loading to be transmitted to carrier；The carrier for carrying the modulated signal to be transmitted is sent to display device and is shown；Information gathering is carried out to the carrier shown on the display device, obtains and receives signal；Using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；According to the frame losing position of the reception signal, delete the receiving frame before the frame losing position, to ensure the positive and negative overlay order of transmission signal, it can solve in the prior art since the link between display device and imaging device is unstable, there is frame losing in the information of caused transmission, influence transmission information accuracy the problem of.

Description

A kind of visual light imaging communication means and system
Technical field
The present invention relates to technical field of visible light communication, and in particular to a kind of visual light imaging communication means and system.
Background technology
Visible light communication technology refers to by the use of visible light signal as information carrier, the transmission without wire message way such as optical fiber Medium, directly transmits the communication mode of optical signal in atmosphere.Visible light signal is a kind of carrier for realizing communication, it is being realized During communication, it is transmitted and receives by photophore (such as LED light source) and photoreceptor.Therefore, visible light signal is utilized It is break-make change (can intuitivism apprehension for flicker) carrying information using photophore, photoreceptor, which passes through, perceives one when transmitting information The light-inletting quantity of section time, judges the flicker rule of photophore, so as to fulfill communication.Existing visible light communication is mostly based on list One LED light source is transmitted, and is received with the photoreceptor of single-point light-intensity test.
One kind that visual light imaging communicates as visible light communication, it is during communication is realized, by that will transmit Information be embedded in existing display device (e.g., computer display screen, flat panel TV, outdoor advertisement screen etc.) and be transmitted, and lead to The imaging device (e.g., digital camera, cell-phone camera are first-class) of entire image collection can be carried out by, which crossing, is received.
But since the link between display device and imaging device is unstable, the information for being easy to cause transmission occurs Frame losing, have impact on the accuracy of the information of transmission.And do not have solution regarding to the issue above at present.
The content of the invention
In view of this, the embodiment of the present invention provides a kind of visual light imaging communication means and system, can solve existing skill Since the link between display device and imaging device is unstable in art, there is frame losing in the information of caused transmission, influences to pass The problem of defeated information accuracy.
To achieve the above object, the embodiment of the present invention provides following technical solution：
A kind of visual light imaging communication means, including：
Obtain signal to be transmitted；
Carry out complementary modulation to the signal to be transmitted, and by the modulated signal loading to be transmitted to carrier；
The carrier for carrying the modulated signal to be transmitted is sent to display device and is shown；
Information gathering is carried out to the carrier shown on the display device, obtains and receives signal；
Using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；
According to the frame losing position of the reception signal, the receiving frame before the frame losing position is deleted, to ensure transmission letter Number positive and negative overlay order.
Optionally, it is described that complementary modulation is carried out to the signal to be transmitted, including：
According to formula xk(i, j)=yk(i,j)+dk(i, j) and dk(i, j)=(- 1)(kmod2)S (i, j) Δ is to described to be passed Defeated signal carries out complementary modulation, wherein, xk(i, j) is modulated signal frame to be transmitted, yk(i, j) is to be transmitted before modulating Signal frame, dk(i, j) is embedding information, and s (i, j) equiprobability value 1 or -1, Δ is embedment strength, and i is the space of two dimensional image The abscissa of coordinate, j are the ordinate of the space coordinate of two dimensional image, and k is the time.
Optionally, it is described using the default automatic frame losing detection algorithm detection frame losing position for receiving signal, including：
According to the difference of difference frame statistical property in the case of frame losing and in the case of not frame losing, the reception signal is detected Frame losing position, the difference frame for it is described reception signal in two neighboring receiving frame difference.
Optionally, in the case of the basis not frame losing and frame losing in the case of difference frame statistical property difference, detection The frame losing position for receiving signal, including：
According to formulaAndCalculate difference frameWherein,For receiving frame, λkFor hybrid cytokine, τ1And τ2For frame losing time delay factor, nk(i, j) is high for additivity This white noise, average 0, variance σ2；
In the case of calculating not frame losing, the spatial mean value of difference frame absolute value；
Calculate under frame loss condition, the spatial mean value of difference frame absolute value；
The spatial mean value of difference frame absolute value is with λ in the case of by emulating observation not frame losingkVariation tendency and lose The spatial mean value of difference frame absolute value is with λ under frame conditionkVariation tendency, detect it is described receive signal frame losing position.
Optionally, in the case of the calculating not frame losing, the spatial mean value of difference frame absolute value, including：
According to formulaf(λk)=[4 λk- 2] Δ, calculates not frame losing In the case of, the spatial mean value of difference frame absolute value；
Wherein, the spatial mean value of difference frame absolute value in the case that M (k, k-1) is not frame losing.
Optionally, in the case of the calculating frame losing, the spatial mean value of difference frame absolute value, including：
According to formula
f1(λkThe λ of)=2kΔ, calculating are lost In the case of frame, the spatial mean value of difference frame absolute value；
Wherein, ML(k-1, k-2) and MLIn the case that (k, k-1) is frame losing, the spatial mean value of difference frame absolute value is described ML(k-1, k-2) and ML(k, k-1) is drawn according to equation below：
A kind of visual light imaging communication system, including：
Acquisition module, for obtaining signal to be transmitted；
Signal modulation module, for carrying out complementary modulation to the signal to be transmitted, and will be described modulated to be transmitted Signal loading is to carrier；
Sending module, for sending the carrier for carrying the modulated signal to be transmitted to display device Shown；
Acquisition module, for carrying out information gathering to the carrier shown on the display device, obtains and receives letter Number；
Frame losing detection module, for using the default automatic frame losing detection algorithm detection frame losing position for receiving signal Put；
Frame processing module, for the frame losing position according to the reception signal, deletes the reception before the frame losing position Frame, to ensure the positive and negative overlay order of transmission signal.
Optionally, the signal modulation module is specifically used for：
According to formula xk(i, j)=yk(i,j)+dk(i, j) and dk(i, j)=(- 1)(kmod2)S (i, j) Δ is to described to be passed Defeated signal carries out complementary modulation, wherein, xk(i, j) is modulated signal frame to be transmitted, yk(i, j) is to be transmitted before modulating Signal frame, dk(i, j) is embedding information, and s (i, j) equiprobability value 1 or -1, Δ is embedment strength, and i is the space of two dimensional image The abscissa of coordinate, j are the ordinate of the space coordinate of two dimensional image, and k is the time.
Optionally, the frame losing detection module is specifically used for：
According to the difference of difference frame statistical property in the case of frame losing and in the case of not frame losing, the reception signal is detected Frame losing position, the difference frame for it is described reception signal in two neighboring receiving frame difference.
Optionally, the frame losing detection module is specifically used for：
According to formulaAndCalculate difference frameWherein,For receiving frame, λkFor hybrid cytokine, τ1And τ2For frame losing time delay factor, nk(i, j) is high for additivity This white noise, average 0, variance σ2；
In the case of calculating not frame losing, the spatial mean value of difference frame absolute value；
Calculate under frame loss condition, the spatial mean value of difference frame absolute value；
The spatial mean value of difference frame absolute value is with λ in the case of by emulating observation not frame losingkVariation tendency and lose The spatial mean value of difference frame absolute value is with λ under frame conditionkVariation tendency, detect it is described receive signal frame losing position.
Based on above-mentioned technical proposal, a kind of visual light imaging communication means and system, base are disclosed in the embodiment of the present invention Complementary modulation is carried out in treating transmission signal, and by the modulated signal loading to be transmitted to carrier；It will carry described The carrier of modulated signal to be transmitted, which is sent to display device, to be shown；To what is shown on the display device The carrier carries out information gathering, obtains and receives signal；The reception signal is detected using default automatic frame losing detection algorithm Frame losing position；According to the frame losing position of the reception signal, the receiving frame before the frame losing position is deleted, to ensure to transmit The positive and negative overlay order of signal, can solve in the prior art since the link between display device and imaging device is unstable Fixed, there is frame losing in the information of caused transmission, the problem of influencing the information accuracy of transmission.
Brief description of the drawings
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, drawings in the following description are 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 flow diagram of visual light imaging communication means disclosed by the embodiments of the present invention；
Fig. 2 is a kind of method flow schematic diagram for detecting the frame losing position for receiving signal disclosed by the embodiments of the present invention；
Fig. 3 is the spatial mean value characteristic variations trend of difference frame absolute value under different parameters provided in an embodiment of the present invention (specifically as shown in Fig. 3 a, Fig. 3 b and Fig. 3 c) and comparison diagram (specifically as shown in Figure 3d)；
Fig. 4 is a kind of structure diagram of visual light imaging communication system provided in an embodiment of the present invention.
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.
Attached drawing 1 is referred to, Fig. 1 is that a kind of flow of visual light imaging communication means disclosed by the embodiments of the present invention is illustrated Figure, this method are applied to visual light imaging communication system, which includes display device and imaging device, wherein, display screen Equipment includes LCD (Liquid Crystal Display, liquid crystal display) screens and LED (Light Emitting Diode, hair Optical diode) this method comprises the following steps for array：
Step S100, obtains signal to be transmitted；
Specifically, signal to be transmitted can be obtained from external equipment by the interface of display device and external equipment.
Step S110, carries out the signal to be transmitted complementary modulation, and by the modulated signal loading to be transmitted To carrier；
Specific modulation system can be any one in the modulation systems such as RGB modulation, intensification modulation, high order modulation. In the present embodiment, can be according to formula xk(i, j)=yk(i,j)+dk(i, j) and dk(i, j)=(- 1)(kmod2)S (i, j) Δ pair The signal to be transmitted carries out complementary modulation, wherein, xk(i, j) is modulated signal frame to be transmitted, ykBefore (i, j) is modulation Signal frame to be transmitted, dk(i, j) is embedding information, and s (i, j) equiprobability value 1 or -1, Δ is embedment strength, and i is X-Y scheme The abscissa of the space coordinate of picture, j are the ordinate of the space coordinate of two dimensional image, and k is the time.Wherein, embedding information is specific It can be the two-dimensional data matrix encoded in advance, or common Quick Response Code.
Step S120, the carrier for carrying the modulated signal to be transmitted is sent to display device and is carried out Display；
The carrier is included on display device, that is, completes the mistake for visible light signal by signal processing to be transmitted Journey.
Step S130, carries out information gathering to the carrier shown on the display device, obtains and receive signal；
Specifically, information gathering can be carried out to the carrier shown on the display device by imaging device, Obtain and receive signal.Here the reception signal obtained is compared with the signal to be transmitted, it is understood that there may be the situation of frame losing.
Step S140, using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；
The reception signal includes multiple receiving frames, specifically, can according in the case of frame losing and not frame losing situation The difference of lower difference frame statistical property, detects the frame losing position for receiving signal, the difference frame is in the reception signal The difference of two neighboring receiving frame.Concrete mode will describe in detail in the content below.
Step S150, according to the frame losing position of the reception signal, deletes the receiving frame before the frame losing position, to protect Demonstrate,prove the positive and negative overlay order of transmission signal.
A kind of visual light imaging communication means is disclosed in the present embodiment, complementary modulation is carried out based on transmission signal is treated, And by the modulated signal loading to be transmitted to carrier；The carrier of the modulated signal to be transmitted will be carried Send to display device and shown；Information gathering is carried out to the carrier shown on the display device, acquisition connects The collection of letters number；Using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；According to the reception signal Frame losing position, delete the receiving frame before the frame losing position, to ensure the positive and negative overlay order of transmission signal, can solve In the prior art since the link between display device and imaging device is unstable, there is frame losing in the information of caused transmission, The problem of influencing the information accuracy of transmission.
Attached drawing 2 is referred to, Fig. 2 is a kind of method stream for detecting the frame losing position for receiving signal disclosed by the embodiments of the present invention Journey schematic diagram, this method comprises the following steps：
Step S200, according to formulaAndMeter Calculate difference frameWherein,For receiving frame, λkFor hybrid cytokine, τ1And τ2For frame losing time delay factor, nk(i,j) For additive white Gaussian noise, average 0, variance σ2；
It should be noted that pre-establish following optical channel modelBased on this Channel model, each frame of receiving frame can be modeled as the mixing of front and rear two frame of display device transmission, and front and rear two frame mixes Composition and division in a proportion example is by λk(i, j) is determined；Influence in view of frame losing introduces frame losing time delay factor τ1And τ2；And further by additivity height The influence of this white noise, average 0, variance σ2.Hybrid cytokine λ is believed that when considering frame losing problemk(i, j) delays with the time Become, and hybrid cytokine is held essentially constant in same receiving frame, therefore model can be approximated to be the formula in this step
Step S210, in the case of calculating not frame losing, the spatial mean value of difference frame absolute value；
Specifically, can be according to formulaf(λk)=[4 λk- 2] Δ, calculates In the case of not frame losing, the spatial mean value of difference frame absolute value；
Wherein, the spatial mean value of difference frame absolute value in the case that M (k, k-1) is not frame losing.
Step S220, calculates under frame loss condition, the spatial mean value of difference frame absolute value.
Specifically, according to formula
f1(λkThe λ of)=2kΔ, calculating are lost In the case of frame, the spatial mean value of difference frame absolute value；
Wherein, ML(k-1, k-2) and MLIn the case that (k, k-1) is frame losing, the spatial mean value of difference frame absolute value is described ML(k-1, k-2) and ML(k, k-1) is drawn according to equation below：
It should be noted that above-mentioned formula (1), (2) and (3) assumes that receiving frame kth frame is τ frame losing, continuous three frame Representation.
Step S230, by emulate observe not frame losing in the case of difference frame absolute value spatial mean value with λkChange become The spatial mean value of difference frame absolute value is with λ under gesture and frame loss conditionkVariation tendency, detect it is described receive signal frame losing position Put.
Fig. 3 shows that the spatial mean value characteristic variations trend of difference frame absolute value under different parameters is (specific such as Fig. 3 a, Fig. 3 b Shown in Fig. 3 c) and comparison diagram (specifically as shown in Figure 3d).
Fig. 3 a represent M (k, k-1) variation tendency, it can be seen that M (k, k-1) onSymmetrically, present first to subtract and increase again Trend；
Fig. 3 b represent MLThe variation tendency of (k-1, k-2), it can be seen that it is with λkMonotonic increase；
Fig. 3 c represent MLThe variation tendency of (k, k-1), it can be seen that it is with λkMonotone decreasing；
Comparison diagram 3a~c, it can be found that frame losing causes the spatial mean value characteristic of difference frame absolute value that significant change occurs.
Fig. 3 d are | M (k, k-1)-ML(k-1, k-2) | and | M (k, k-1)-ML(k, k-1) | variation tendency, it can be seen that No matter λkValue how much, always have one value larger between the two, frame losing position can be detected using this larger difference.
Therefore, by emulate observe not frame losing in the case of difference frame absolute value spatial mean value with λkVariation tendency with And under frame loss condition difference frame absolute value spatial mean value with λkVariation tendency, detect the frame losing position for receiving signal Criterion is as follows：
IfOrThen think k, k-1, k+1 are can The frame losing position of energy；
Exclude false frame losing position, true frame losing position
WhereinTo utilize the difference frame that actual receiving frame calculates absolute The spatial mean value of value,For the estimate of M (k, k-1), can be obtained using m (k, k-1).In addition
Attached drawing 4 is referred to, Fig. 4 is a kind of structural representation of visual light imaging communication system provided in an embodiment of the present invention Figure, the system include such as lower part：
Acquisition module 10, for obtaining signal to be transmitted；
Signal modulation module 11, for carrying out complementary modulation to the signal to be transmitted, and will be described modulated to be passed Defeated signal loading is to carrier；
Sending module 12, sets for sending the carrier for carrying the modulated signal to be transmitted to display screen It is standby to be shown；
Acquisition module 13, for carrying out information gathering to the carrier shown on the display device, obtains and receives Signal；
Frame losing detection module 14, for using the default automatic frame losing detection algorithm detection frame losing position for receiving signal Put；
Frame processing module 15, for the frame losing position according to the reception signal, deletes connecing before the frame losing position Frame is received, to ensure the positive and negative overlay order of transmission signal.
Optionally, the signal modulation module is specifically used for：
According to formula xk(i, j)=yk(i,j)+dk(i, j) and dk(i, j)=(- 1)(kmod2)S (i, j) Δ is to described to be passed Defeated signal carries out complementary modulation, wherein, xk(i, j) is modulated signal frame to be transmitted, yk(i, j) is to be transmitted before modulating Signal frame, dk(i, j) is embedding information, and s (i, j) equiprobability value 1 or -1, Δ is embedment strength, and i is the space of two dimensional image The abscissa of coordinate, j are the ordinate of the space coordinate of two dimensional image, and k is the time.
Optionally, the frame losing detection module is specifically used for：
According to the difference of difference frame statistical property in the case of frame losing and in the case of not frame losing, the reception signal is detected Frame losing position, the difference frame for it is described reception signal in two neighboring receiving frame difference.
Optionally, the frame losing detection module is specifically used for：
According to formulaAndCalculate difference frameWherein,For receiving frame, λkFor hybrid cytokine, τ1And τ2For frame losing time delay factor, nk(i, j) is high for additivity This white noise, average 0, variance σ2；
In the case of calculating not frame losing, the spatial mean value of difference frame absolute value；
Calculate under frame loss condition, the spatial mean value of difference frame absolute value；
The spatial mean value of difference frame absolute value is with λ in the case of by emulating observation not frame losingkVariation tendency and lose The spatial mean value of difference frame absolute value is with λ under frame conditionkVariation tendency, detect it is described receive signal frame losing position.
It is described in detail in embodiment of the method part it should be noted that the concrete function of above-mentioned modules is realized, this Embodiment repeats no more.
In summary：
A kind of visual light imaging communication means and system are disclosed in the embodiment of the present invention, is carried out based on transmission signal is treated Complementary modulation, and by the modulated signal loading to be transmitted to carrier；The modulated signal to be transmitted will be carried The carrier send to display device and shown；The carrier shown on the display device is adopted into row information Collection, obtains and receives signal；Using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；According to described The frame losing position of signal is received, deletes the receiving frame before the frame losing position, to ensure the positive and negative overlay order of transmission signal, It can solve in the prior art since the link between display device and imaging device is unstable, the information of caused transmission goes out The problem of showing frame losing, influencing the information accuracy of transmission.
Each embodiment is described by the way of progressive in this specification, what each embodiment stressed be and other The difference of embodiment, between each embodiment identical similar portion mutually referring to.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.
Professional further appreciates that, with reference to each exemplary unit of the embodiments described herein description And algorithm steps, can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate hardware and The interchangeability of software, generally describes each exemplary composition and step according to function in the above description.These Function is performed with hardware or software mode actually, application-specific and design constraint depending on technical solution.Specialty Technical staff can realize described function to each specific application using distinct methods, but this realization should not Think beyond the scope of this invention.
Can directly it be held with reference to the step of method or algorithm that the embodiments described herein describes with hardware, processor Capable software module, or the two combination are implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology In any other form of storage medium well known in field.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention. A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one The most wide scope caused.

Claims (10)

  1. A kind of 1. visual light imaging communication means, it is characterised in that including：
    Obtain signal to be transmitted；
    Carry out complementary modulation to the signal to be transmitted, and by the modulated signal loading to be transmitted to carrier；
    The carrier for carrying the modulated signal to be transmitted is sent to display device and is shown；
    Information gathering is carried out to the carrier shown on the display device, obtains and receives signal；
    Using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；
    According to the frame losing position of the reception signal, the receiving frame before the frame losing position is deleted, to ensure transmission signal Positive and negative overlay order.
  2. 2. according to the method described in claim 1, it is characterized in that, described carry out complementary modulation, bag to the signal to be transmitted Include：
    According to formula xk(i, j)=yk(i,j)+dk(i, j) and dk(i, j)=(- 1)(kmod2)S (i, j) Δ is to the letter to be transmitted Number carry out complementary modulation, wherein, xk(i, j) is modulated signal frame to be transmitted, yk(i, j) is the signal to be transmitted before modulation Frame, dk(i, j) is embedding information, and s (i, j) equiprobability value 1 or -1, Δ is embedment strength, and i is the space coordinate of two dimensional image Abscissa, j be two dimensional image space coordinate ordinate, k is the time.
  3. 3. method according to claim 1 or 2, it is characterised in that described using default automatic frame losing detection algorithm inspection The frame losing position of the reception signal is surveyed, including：
    According to the difference of difference frame statistical property in the case of frame losing and in the case of not frame losing, detect and described receive losing for signal Frame position, the difference frame are the difference for receiving two neighboring receiving frame in signal.
  4. 4. according to the method described in claim 3, it is characterized in that, in the case of the basis not frame losing and in the case of frame losing The difference of difference frame statistical property, detects the frame losing position for receiving signal, including：
    According to formulaAndCalculate difference frameWherein,For receiving frame, λkFor hybrid cytokine, τ1And τ2It is high for additivity for frame losing time delay factor, nk (i, j) This white noise, average 0, variance σ2；
    In the case of calculating not frame losing, the spatial mean value of difference frame absolute value；
    Calculate under frame loss condition, the spatial mean value of difference frame absolute value；
    The spatial mean value of difference frame absolute value is with λ in the case of by emulating observation not frame losingkVariation tendency and frame loss condition The spatial mean value of lower difference frame absolute value is with λkVariation tendency, detect it is described receive signal frame losing position.
  5. 5. according to the method described in claim 4, it is characterized in that, it is described calculating not frame losing in the case of, difference frame absolute value Spatial mean value, including：
    According to formulaf(λk)=[4 λk- 2] Δ, calculates the situation of not frame losing Under, the spatial mean value of difference frame absolute value；
    Wherein, the spatial mean value of difference frame absolute value in the case that M (k, k-1) is not frame losing.
  6. 6. according to the method described in claim 4, it is characterized in that, it is described calculating frame losing in the case of, difference frame absolute value Spatial mean value, including：
    According to formula
    f1(λkThe λ of)=2kΔ, calculates frame losing In the case of, the spatial mean value of difference frame absolute value；
    Wherein, ML(k-1, k-2) and MLIn the case that (k, k-1) is frame losing, the spatial mean value of difference frame absolute value, the ML(k- 1, k-2) and ML(k, k-1) is drawn according to equation below：
    <mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>&amp;lsqb;</mo> <mn>1</mn> <mo>-</mo> <msub> <mi>&amp;lambda;</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mo>&amp;rsqb;</mo> <msub> <mi>x</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>&amp;lambda;</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <msub> <mi>x</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> <mo>-</mo> <mn>3</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>n</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>;</mo> </mrow>
    <mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>&amp;lsqb;</mo> <mn>1</mn> <mo>-</mo> <msub> <mi>&amp;lambda;</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mo>&amp;rsqb;</mo> <msub> <mi>x</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>&amp;lambda;</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <msub> <mi>x</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>n</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>;</mo> </mrow>
    <mrow> <mtable> <mtr> <mtd> <mrow> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mi>k</mi> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>=</mo> <mo>&amp;lsqb;</mo> <mn>1</mn> <mo>-</mo> <msub> <mi>&amp;lambda;</mi> <mi>k</mi> </msub> <mo>&amp;rsqb;</mo> <msub> <mi>x</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> <mo>+</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>+</mo> <msub> <mi>&amp;lambda;</mi> <mi>k</mi> </msub> <msub> <mi>x</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>n</mi> <mi>k</mi> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>;</mo> </mrow>
    <mrow> <mtable> <mtr> <mtd> <mrow> <mi>&amp;Delta;</mi> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mo>&lt;</mo> <mi>k</mi> <mo>-</mo> <mn>1</mn> <mo>,</mo> <mi>k</mi> <mo>-</mo> <mn>2</mn> <mo>&gt;</mo> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>&amp;ap;</mo> <mo>-</mo> <mn>2</mn> <msub> <mi>&amp;lambda;</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <msub> <mi>d</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <msub> <mi>n</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>2</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>n</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>;</mo> </mrow>
    <mrow> <mtable> <mtr> <mtd> <mrow> <mi>&amp;Delta;</mi> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mo>&lt;</mo> <mi>k</mi> <mo>,</mo> <mi>k</mi> <mo>-</mo> <mn>1</mn> <mo>&gt;</mo> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>=</mo> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mover> <mi>x</mi> <mo>~</mo> </mover> <mi>k</mi> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>&amp;ap;</mo> <mo>&amp;lsqb;</mo> <mn>2</mn> <mo>-</mo> <mn>2</mn> <msub> <mi>&amp;lambda;</mi> <mi>k</mi> </msub> <mo>&amp;rsqb;</mo> <msub> <mi>d</mi> <mrow> <mi>k</mi> <mo>+</mo> <mi>&amp;tau;</mi> <mo>`</mo> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>+</mo> <msub> <mi>n</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> <mo>-</mo> <msub> <mi>n</mi> <mi>k</mi> </msub> <mrow> <mo>(</mo> <mi>i</mi> <mo>,</mo> <mi>j</mi> <mo>)</mo> </mrow> </mrow> </mtd> </mtr> </mtable> <mo>.</mo> </mrow>
  7. A kind of 7. visual light imaging communication system, it is characterised in that including：
    Acquisition module, for obtaining signal to be transmitted；
    Signal modulation module, for carrying out complementary modulation to the signal to be transmitted, and by the modulated signal to be transmitted It is loaded into carrier；
    Sending module, carries out for sending the carrier for carrying the modulated signal to be transmitted to display device Display；
    Acquisition module, for carrying out information gathering to the carrier shown on the display device, obtains and receives signal；
    Frame losing detection module, for using the default automatic frame losing detection algorithm detection frame losing position for receiving signal；
    Frame processing module, for the frame losing position according to the reception signal, deletes the receiving frame before the frame losing position, with Ensure the positive and negative overlay order of transmission signal.
  8. 8. system according to claim 7, it is characterised in that the signal modulation module is specifically used for：
    According to formula xk(i, j)=yk(i,j)+dk(i, j) and dk(i, j)=(- 1)(kmod2)S (i, j) Δ is to the letter to be transmitted Number carry out complementary modulation, wherein, xk(i, j) is modulated signal frame to be transmitted, yk(i, j) is the signal to be transmitted before modulation Frame, dk(i, j) is embedding information, and s (i, j) equiprobability value 1 or -1, Δ is embedment strength, and i is the space coordinate of two dimensional image Abscissa, j be two dimensional image space coordinate ordinate, k is the time.
  9. 9. the system according to claim 7 or 8, it is characterised in that the frame losing detection module is specifically used for：
    According to the difference of difference frame statistical property in the case of frame losing and in the case of not frame losing, detect and described receive losing for signal Frame position, the difference frame are the difference for receiving two neighboring receiving frame in signal.
  10. 10. system according to claim 9, it is characterised in that the frame losing detection module is specifically used for：
    According to formulaAndCalculate difference frameWherein,For receiving frame, λkFor hybrid cytokine, τ1And τ2For frame losing time delay factor, nk(i, j) is high for additivity This white noise, average 0, variance σ2；
    In the case of calculating not frame losing, the spatial mean value of difference frame absolute value；
    Calculate under frame loss condition, the spatial mean value of difference frame absolute value；
    The spatial mean value of difference frame absolute value is with λ in the case of by emulating observation not frame losingkVariation tendency and frame loss condition The spatial mean value of lower difference frame absolute value is with λkVariation tendency, detect it is described receive signal frame losing position.
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