CN105187732B - A kind of visible light signal method for transmitting information and device using the different colours from light source - Google Patents

A kind of visible light signal method for transmitting information and device using the different colours from light source Download PDF

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Publication number
CN105187732B
CN105187732B CN201510623526.XA CN201510623526A CN105187732B CN 105187732 B CN105187732 B CN 105187732B CN 201510623526 A CN201510623526 A CN 201510623526A CN 105187732 B CN105187732 B CN 105187732B
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visible light
different
light source
light signal
signal
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CN105187732A (en
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郭成
胡洪
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BEIJING G-WEARABLES INFORMATION SCIENCE & TECHNOLOGY Co Ltd
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BEIJING G-WEARABLES INFORMATION SCIENCE & TECHNOLOGY Co Ltd
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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

Abstract

The invention discloses a kind of method and apparatus for transmitting/obtaining information using the visible light signal from light source.Method includes: based on information to be transmitted, two or more driving signals of modulated light source, to obtain two or more modulated drive signals for driving the visible light signal of light source transmitting different colours；And it is based on two or more modulated drive signals, emit the visible light signal of different colours, to transmit the pattern of the combination different color fringe obtained of the visible light signal of the different colours shown from image acquired in visible light signal, image is wherein obtained by the imaging sensor with Rolling shutter, the sample frequency of Rolling shutter is higher than the frame rate of imaging sensor, and wherein each of color fringe represents at least three data bit.

Description

A kind of visible light signal method for transmitting information using the different colours from light source and Device
The application is the divisional application of following patent application:
Application number: 201410168806.1
The applying date: on April 24th, 2014
A kind of denomination of invention: method and apparatus for transmitting/obtain information using visible light signal
Technical field
The present invention relates to visible light communication fields, more particularly to using visible light signal transmit/obtain information method and Device.
Background technique
Visible light communication is the communication technology using the variation transmission information of visible light (color, intensity or position).It is this The communication technology for being used for transmission information is the optical signal based on high frequency flicker.Specifically, information to be transmitted is encoded as counting first Word signal；Then the digital signal is used for the driving current of modulated light source or the duration of driving voltage or frequency, so that Light source high frequency flicker.The high frequency flicker signal can be detected by light-sensitive unit, for example, imaging sensor, and revert to and transmitted Information.The major advantage of this transmission of visible light technology is highly confidential property, does not account for radio channel resource, is at low cost and easy It is integrated with LED.
One of existing visible light communication technology is based on imaging sensor " Rolling shutter " mechanism.Image sensing The different piece of device different time expose, i.e., every row or be often listed in different time exposure.Based on this feature, when shooting brightness is fast When the image of the light source of speed variation, the imaging sensor with Rolling shutter can obtain the image comprising bright fringe or dark fringe. By measuring the width or gray scale of striped, transmitted information can be restored.
But this method has following defect: the local excessive exposure of imaging sensor may influence the width of striped, example Such as, in overexposure region, striped may narrow or even disappear, and lead to image analysis and decoding failure；And it is different Background illumination condition can lead to measurement width of fringe uncertainty.
In addition, the light-sensitive unit used in this visible light communication must be it is specially designed, to detect visible light, because This, can be only applied to limited scene.Although moreover, commercially available mobile device (such as smart phone, tablet computer, the palm Upper computer) there is photosensitive part, such as imaging sensor, but it is not suitable for this high frequency flicker signal.
Summary of the invention
In view of the above problems, propose the present invention, the present invention provides it is a kind of using visible light signal transmit or from Optical signal obtains the technical solution of information, to overcome at least one drawbacks described above.
According to the first aspect of the invention, a kind of visible light signal transmission using the different colours from light source is provided The method of information, comprising: be based on information to be transmitted, two or more driving signals of the light source modulated, to obtain use In two or more modulated drive signals for the visible light signal for driving the light source transmitting different colours, the modulation driving The level of signal is changed between high level and low level with different frequencies and/or different phases and/or different amplitudes； And be based on the two or more modulated drive signals, emit the visible light signal of different colours, with transmission from it is described can The combination different color fringe obtained of the visible light signal of the different colours shown in image acquired in light-exposed signal Pattern, the level of the visible light signal is with different frequencies and/or different phases and/or different amplitudes in high level Change between low level, wherein described image is obtained by the imaging sensor with Rolling shutter, the Rolling shutter Sample frequency is higher than the frame rate of described image sensor, and wherein each of color fringe represents at least three data bit.
Optionally, in the above method of embodiment according to the present invention, wherein information to be transmitted is based on, described in modulation Two or more driving signals of light source include: based on letter to be transmitted to obtain two or more modulated drive signals Breath, modulates two or more driving voltages or two or more driving currents of the light source, to obtain first group of modulation Driving voltage or first group of modulation driving current.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein first group of modulation driving electricity Stream be respectively greater than unmodulated driving current so that by first group of modulation driving current driving light source luminous flux be equal to by The luminous flux for the light source that the unmodulated driving current is driven.
Optionally, in any of the above-described method of embodiment according to the present invention, further includes: based on high frequency carrier letter Number second group of modulation driving current, emit the visible light signal, second group of modulation driving current is greater than unmodulated drive Streaming current, so that including in high level and low level each period by the light source of second group of modulation driving current driving Luminous flux is constant.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein the pattern of different color fringes Corresponding to the information including data bit, the data bit includes number, color, brightness or the arrangement corresponding to the color fringe The data of sequence.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein the pattern of different color fringes Also correspond to include one or more start bits and/or one or more error correction bits information, the start bit for identification one The initial position of group data bit, the error correction bit are used to check the mistake in the data bit.
Optionally, in any of the above-described method of embodiment according to the present invention, it is based on information to be transmitted, described in modulation Two or more driving signals of light source, with obtain two or more modulated drive signals include: modulation it is described two or The frequency and/or phase and/or amplitude of more driving signals, to obtain two or more modulated drive signals.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein the pattern of different color fringes Corresponding to the information including data bit, the quantity for the data bit transmitted at some time point is equal to or more than the visible light signal Wavelength quantity.
Optionally, it in any of the above-described method of embodiment according to the present invention, is opened wherein the high level corresponds to State, the low level correspond to closed state, and emit include transmitting with different frequency open state and closed state it Between the visible light signal of different colours that changes.
It optionally, further include based on during time interval in any of the above-described method of embodiment according to the present invention The luminance level of color fringe and the luminance level based on color fringe whether change in the time interval, data value is compiled Code arrives the time interval of multiple color fringes.
According to the second aspect of the invention, a kind of visible light signal acquisition using the different colours from light source is provided The method of information, comprising: the visible light signal of the different colours emitted from light source obtains image, the visible light signal Level is changed between high level and low level with different frequencies and/or different phases and/or different amplitudes；Measurement from The pattern for the different color fringes in described image that the visible light signal obtains；And it obtains corresponding to described different The information of the pattern of color fringe, wherein obtaining described image, the Rolling shutter by the imaging sensor with Rolling shutter Sample frequency be higher than the frame rate of described image sensor, and wherein each of color fringe represents at least three data Position.
Optionally, in the above method of embodiment according to the present invention, wherein obtaining image includes: fast with roller shutter The imaging sensor photographs described image of door, wherein the different piece of described image sensor exposes in different time points.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein the visible light signal is by institute It states light source to emit based on modulated drive signal, the modulated drive signal drives the light source to emit the visible light letter Number, the level of the visible light signal is with different frequencies and/or different phases and/or different amplitudes in high level and low Change between level.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein the light source is one or more groups of Light source, and: the visible light signal emitted from light source obtains image, and the level of the visible light signal is with different frequencies And/or it includes: from one or more groups of light that different phases and/or different amplitudes change between high level and low level The visible light signal of source transmitting obtains image, and the level of the visible light signal is with different frequencies and/or different phases Position and/or different amplitudes change between high level and low level, wherein one or more exposure areas in described image Corresponding to one or more groups of light sources；Measure the different color fringes from the described image that the visible light signal obtains Pattern include: the pattern for measuring one or more different color fringes of exposure area in described image；With And obtaining the information of the pattern corresponding to the different color fringe includes: to obtain corresponding to one in described image Or more the different color fringe pattern of exposure area information.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein different coloured silks in described image Vitta line be obtained from the combination of, two or more visible light signals with different wave length with different colours, and And the information for corresponding to the pattern of the different color fringe includes data bit, the number for the data bit transmitted at some time point Amount is equal to or more than the quantity of the wavelength of visible light signal.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein in the pattern of color fringe Neighbouring striped is different colours.
It optionally, further include obtaining in multiple time intervals in any of the above-described method of embodiment according to the present invention Different color fringes, and pass through following steps obtain the single time interval from different color fringes data Value: determine that each color is detected in which of three or more luminance states state during single time interval It arrives；Determine whether each color in single time interval changes luminance level.
According to the third aspect of the invention we, it provides a kind of for transmitting information using the visible light signal of different colours Light source, comprising: modulator modulates two or more driving signals of the light source, for being based on information to be transmitted to obtain It takes in two or more modulated drive signals for the visible light signal for driving the light source transmitting different colours, the modulation The level of driving signal is with different frequencies and/or different phases and/or different amplitudes between high level and low level Variation；And transmitter emits the visible light letter of different colours for being based on the two or more modulated drive signals Number, to transmit the pattern of the color fringe shown from image acquired in the visible light signal, the visible light signal Level is changed between high level and low level with different frequencies and/or different phases and/or different amplitudes, is prized Each of vitta line represents at least three data bit.
Optionally, in the above-mentioned light source of embodiment according to the present invention, wherein the modulator is used for: based on to be transmitted Information, two or more driving voltages or two or more driving currents of the light source are modulated, to obtain first group Modulate driving voltage or first group of modulation driving current.
Optionally, in any of the above-described light source of embodiment according to the present invention, wherein first group of modulation driving electricity Stream be respectively greater than unmodulated driving current so that by first group of modulation driving current driving light source luminous flux be equal to by The luminous flux for the light source that the unmodulated driving current is driven.
Optionally, in any of the above-described light source of embodiment according to the present invention, wherein the transmitter is used for: being based on band There is second group of modulation driving current of high-frequency carrier signal, emits the visible light signal, second group of modulation driving current Greater than unmodulated driving current, so that including high level and low level by the light source of second group of modulation driving current driving Each period in luminous flux be constant.
Optionally, in any of the above-described light source of embodiment according to the present invention, wherein the pattern of different color fringes Corresponding to the information including data bit comprising suitable corresponding to the number of the different color fringe, color, brightness or arrangement The data of sequence.
Optionally, in any of the above-described method of embodiment according to the present invention, wherein the pattern of different color fringes Also correspond to include one or more start bits and/or one or more error correction bits information, the start bit for identification one The initial position of group data bit, the error correction bit are used to check the mistake in the data bit.
Optionally, in any of the above-described light source of embodiment according to the present invention, wherein the modulator is used for: modulation institute The frequency and/or phase and/or amplitude of two or more driving signals are stated, to obtain two or more modulation driving letters Number.
Optionally, in any of the above-described light source of embodiment according to the present invention, wherein different coloured silks in described image Vitta line is obtained from the combination of the visible light signal with different colours, and the pattern pair of the different color fringe Ying Yu includes the information of data bit, and the quantity for the data bit transmitted at some time point is equal to or more than the wavelength of visible light signal Quantity.
According to the fourth aspect of the invention, a kind of obtain from the visible light signal of the different colours from light source is provided to believe The device of breath, comprising: the visible light signal of imaging sensor, the different colours for emitting from light source obtains image, institute The level of visible light signal is stated with different frequencies and/or different phases and/or different amplitudes in high level and low level Between change, wherein described image sensor have Rolling shutter, and wherein the sample frequency of the Rolling shutter be higher than institute State the frame rate of imaging sensor；Memory, for storing the image of described image sensor acquisition；Processor, for measuring The pattern of different color fringes in the described image of storage in the memory, and obtain and correspond to the different coloured silk The information of the pattern of vitta line, wherein each of color fringe represents at least three data bit.
Optionally, in the above-mentioned apparatus of embodiment according to the present invention, wherein described image sensor is with roller shutter The imaging sensor of shutter simultaneously is used to obtain image from visible light signal, and wherein the different piece of described image sensor is in difference Time point exposure.
Optionally, in any of the above-described device of embodiment according to the present invention, wherein the visible light signal is by institute It states light source to emit based on modulated drive signal, the modulated drive signal drives the light source to emit the visible light letter Number, the level of the visible light signal is with different frequencies and/or different phases and/or different amplitudes in high level and low Change between level.
Optionally, in the above-mentioned apparatus of embodiment according to the present invention, wherein the light source is one or more groups of light sources, And: described image sensor is used to obtain image from the visible light signal that one or more groups of light sources emit, described The level of visible light signal with different frequencies and/or different phases and/or different amplitudes high level and low level it Between change, wherein one or more exposure areas in described image correspond to one or more groups of light sources；The memory For storing the image of described image sensor acquisition；The processor is used to measure one or more in described image The pattern of the different color fringes of a exposure area, and obtain one or more the exposure corresponded in described image The information of the pattern of the different color fringe in region.
Optionally, in any of the above-described device of embodiment according to the present invention, wherein different coloured silks in described image Vitta line is to obtain from the combination of the visible light signal with different colours, and correspond to the different color fringe The information of pattern includes data bit, and the quantity for the data bit transmitted at some time point is equal to or more than the wavelength of visible light signal Quantity.
To sum up, the exemplary embodiment of the present invention provides a kind of sides for effectively and being efficiently used for transmission/obtaining information Information more rapidly and is more accurately transmitted/obtained to case, and transmit/acquired information may include more data bit.It is white Optical transport only has representative " 1 " or the transmission of " 0 " or does not transmit two kinds of selections, within the unit time, is only capable of the number of 1 bit of transmission According to.Compared with white transition, an exemplary embodiment of the present invention is sent out within the unit time using the light source of multiple color The visible light signal for penetrating two or more wavelength can transmit more multiple data bit, for example, three kinds of color RGB can transmit 24 bits Data.It further, can be in unit using the different frequency of visible light signal and/or out of phase and/or different amplitudes Between transmit more data.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention, And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can It is clearer and more comprehensible, following spy enumerates a specific embodiment of the invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention Limitation.Component in attached drawing is not necessarily proportional relative to each other.And throughout the drawings, with identical reference Symbol indicates identical component.In the accompanying drawings:
Fig. 1 is the process of the method 100 using visible light signal transmission information of an exemplary embodiment of the present invention Figure；
Fig. 2 is the driving signal for being used to drive light source modulated with OOK method of an exemplary embodiment of the present invention Schematic diagram；
Fig. 3 A is the driving for being used to drive light source modulated with OOK method in accordance with an alternative illustrative embodiment of the present invention The schematic diagram of signal；
Fig. 3 B is the schematic diagram for the image that the slave visible light signal of an exemplary embodiment of the present invention obtains；
Fig. 4, which is that the frequency by modulated drive signal in accordance with an alternative illustrative embodiment of the present invention is obtained, to be used for Drive the schematic diagram of the modulated drive signal of light source；
Fig. 5 is that the amplitude by modulated drive signal of an exemplary embodiment of the present invention is obtained for driving The schematic diagram of the modulated drive signal of light source；
Fig. 6 is that the phase by modulated drive signal of an exemplary embodiment of the present invention is obtained for driving The schematic diagram of the modulated drive signal of light source；
Fig. 7 is the amplitude institute of the driving signal by modulation one light source of driving of an exemplary embodiment of the present invention The schematic diagram of the modulated drive signal for driving light source obtained；
Fig. 8 is the schematic diagram for the image that the slave visible light signal of an exemplary embodiment of the present invention obtains；
Fig. 9 is the phase and amplitude of the driving signal by modulation driving light source of an exemplary embodiment of the present invention The schematic diagram of modulated drive signal obtained for driving light source；
Figure 10 is the frequency and width of the driving signal by modulation driving light source of an exemplary embodiment of the present invention Spend the schematic diagram of the modulated drive signal obtained for driving light source；
Figure 11 is the frequency and phase of the driving signal by modulation driving light source of an exemplary embodiment of the present invention The schematic diagram of the position modulated drive signal obtained for driving light source；
Figure 12 is the pattern corresponding to color fringe including a start bit of an exemplary embodiment of the present invention Information schematic diagram；
It includes a start bit and error correction bit correspond to coloured silk that Figure 13, which is an exemplary embodiment of the present invention, The schematic diagram of the information of the pattern of vitta line；
Figure 14 A is the modulation driving of the light source equal to unmodulated driving current according to an illustrative embodiment of the invention The schematic diagram of electric current；
Figure 14 B is the modulation driving current greater than unmodulated driving current according to an illustrative embodiment of the invention Schematic diagram；
Figure 14 C is the tune greater than unmodulated driving current of no high-frequency carrier signal according to an exemplary embodiment of the present invention The schematic diagram of driving current processed；
Figure 14 D be it is according to an exemplary embodiment of the present invention with high-frequency carrier signal be greater than unmodulated driving current Modulate the schematic diagram of driving current；
Figure 15 be the explanation of exemplary embodiment according to the present invention for two or more wavelength from light source can The flow chart of the method for light-exposed signal acquisition information；
Figure 16 is the schematic diagram of the image from visible light signal of an exemplary embodiment of the present invention；
Figure 17 be an exemplary embodiment of the present invention correspond to one or more groups of light sources comprising one or more The schematic diagram of the image of exposure area；
Figure 18 is an exemplary embodiment of the present invention for transmitting 300 He of light source of information by visible light signal The schematic diagram of device 400；
Figure 19 is the schematic diagram of the device including multiple images sensor of an exemplary embodiment of the present invention；
Figure 20 A is the full screen display of an exemplary embodiment of the present invention with realtime graphic and the letter obtained from it The schematic diagram of the interface of breath；
Figure 20 B is the signal of the interface for the information that the display of an exemplary embodiment of the present invention is obtained from image Figure；
Figure 21 is the signal of the device for obtaining information from visible light signal of an exemplary embodiment of the present invention Figure, the device include the imaging sensor activated by the activation signal that transmitter is sent；
Figure 22 is an exemplary embodiment of the present invention with the hardware based switch installed in transmitter, to activate For the schematic diagram from the imaging sensor in the device that visible light signal obtains information；
Figure 23 is the schematic diagram of the sensor being integrated among transmitter of an exemplary embodiment of the present invention；
Figure 24 is the schematic diagram that a plurality of types of information are transmitted with transmitter of an exemplary embodiment of the present invention；
Figure 25 is the transmitting including light source, processor, battery and charging circuit of an exemplary embodiment of the present invention The schematic diagram of device；
Figure 26 is an exemplary embodiment of the present invention including light source, processor, battery, charging circuit and sensor Transmitter schematic diagram；
Figure 27 is an exemplary embodiment of the present invention including light source, processor, battery, charging circuit, sensor With the schematic diagram of the transmitter of memory；
Figure 28 is the schematic diagram of the device for obtaining information of an exemplary embodiment of the present invention；
Figure 29 is the schematic diagram of the sensor being integrated in ring of an exemplary embodiment of the present invention；
Figure 30 is that an exemplary embodiment of the present invention is integrated among battery powered wearable electronic device The schematic diagram of transmitter；
Figure 31 is the transmitting including two or more light sources and microprocessor of an exemplary embodiment of the present invention The schematic diagram of device；
Figure 32 is an exemplary embodiment of the present invention including two or more light sources, microprocessor and driver The schematic diagram of transmitter；
Figure 33 is the transmitter including microprocessor and battery charger of an exemplary embodiment of the present invention Schematic diagram；
Figure 34 is the hair including microprocessor, battery charger and memory of an exemplary embodiment of the present invention The schematic diagram of emitter；
Figure 35 is an exemplary embodiment of the present invention including microprocessor, battery charger, memory and biography The schematic diagram of the transmitter of sensor；
Figure 36 is an exemplary embodiment of the present invention including microprocessor, battery charger, memory, sensing The schematic diagram of device and the transmitter of network adapter；
Figure 37 is that an exemplary embodiment of the present invention illustrates transmitter and for obtaining information from visible light signal The device including imaging sensor between communication schematic diagram；
Figure 38 is the flow chart that the transmitter of an exemplary embodiment of the present invention sends the method for visible light signal；
Figure 39 is the process that the imaging sensor of an exemplary embodiment of the present invention receives the method for visible light signal Figure；
Figure 40 is the flow chart of the positioning system based on visible light signal of an exemplary embodiment of the present invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure It is fully disclosed to those skilled in the art.
According to the first aspect of the invention, a kind of side using the visible light signal transmission information from light source is provided Method.Fig. 1 is the method 100 of visible light signal transmission information of the utilization of an exemplary embodiment of the present invention from light source Flow chart.
As shown in Figure 1, method 100 starts from step 110, it is based on information to be transmitted, modulates two of the light source or more Multiple driving signals, to obtain for driving the light source to emit two of visible light signal of two or more wavelength or more Multiple modulated drive signals, the level of the modulated drive signal is with different frequencies and/or different phases and/or different Amplitude changes between high level and low level.
An exemplary embodiment of the present invention, light source can be any light source of transmitting visible light signal, for example, LED, Fluorescent lamp or incandescent lamp.
An exemplary embodiment of the present invention can be any kind of information by the information that visible light signal transmits, For example, data, such as text, image, audio, video data, the identifier or other information of light source.
An exemplary embodiment of the present invention, light source may include different light-emitting components, to issue color fringe pattern The visible light signal of two or more wavelength.For example, light source may include red (R), green (G) or blue (B) light-emitting component simultaneously And the light of RGB color can be issued by driving, can be shot for by imaging sensor comprising it is colored (red, green, yellow, blue, powder, blueness, It is white, black) image of candy strip, wherein different colors represent include information to be transmitted different code.
An exemplary embodiment of the present invention, the driving signal of light source can be square wave, sine wave, triangular wave, height The form of frequency carrier wave or other waves, above-mentioned wave include DC component.
An exemplary embodiment of the present invention, can be modulated with pulse width two of (PWM) method modulated light source or Multiple driving signals.In general, the duration of pulse is fixed, the duty ratio of modulated signal, one of them pulse period Duty ratio (such as square wave) be positive pulse duration (duration of positive part) and total duration ratio.
An exemplary embodiment of the present invention, step 110 can include: be based on information to be transmitted, modulate the light source Two or more driving voltages or two or more driving currents, to obtain first group of modulation driving voltage or first group Modulate driving current.First modulation driving voltage or the first modulation driving current can be used for that light source is driven to emit color fringe pattern The modulated drive signal of the visible light signal of two or more wavelength, the level of the visible light signal is with different frequencies And/or different phases and/or different amplitudes change between high level and low level.
An exemplary embodiment of the present invention, step 110 can include: modulate the two or more driving signals Frequency and/or phase and/or amplitude (that is, one of frequency, phase and amplitude, two or three), to obtain two or more A modulated drive signal.
An exemplary embodiment of the present invention can modulate the drive for driving light source with on-off keying (OOK) method Dynamic signal.Fig. 2 is the driving signal for being used to drive light source modulated with OOK method of an exemplary embodiment of the present invention Schematic diagram.Based on information to be transmitted, shone for driving comprising red (R), green (G) or blue (B) with the modulation of OOK method First light source, the driving signal of second light source and third light source of element, convert it between " 1 " and " 0 ".Optionally, it drives Dynamic signal can be driving current or driving voltage, and be based on information to be transmitted, modulated for driving three light sources Driving current/voltage, as shown in Fig. 2, to obtain first group of modulation driving current.It is driven by first group of modulation driving current/voltage Dynamic, three light sources can distinguish the visible of the RGB color that launching electrical level is changed between high level and low level with different frequencies Optical signal.
It is spaced in 1-8 in different times, there is the various combination of the visible light signal of different colours, generate and shown in image Different color fringes.For example, first light source and second light source are in " 0 ", and third light source is in " 1 " in time interval 1, The light issued is blue, is the color of third light source.In time interval 3, first light source is in " 0 ", second light source and Third light source is in " 1 ", and the light issued is cyan, is the color of second light source and third light source.
Fig. 3 A is the driving for being used to drive light source modulated with OOK method in accordance with an alternative illustrative embodiment of the present invention The schematic diagram of signal.By modulated drive signal, obtaining for respectively driving includes red (R), green (G) or blue (B) hair First light source, the driving signal of second light source and third light source of optical element.Optionally, it is based on information to be transmitted, it can be with such as The modulation of OOK method shown in Fig. 3 A is for driving the driving current of three light sources, to obtain first group of modulation driving current.By One group of modulation driving current/voltage driving, three light sources can distinguish launching electrical level with different frequencies in high level and low level Between the visible light signal of RGB color that changes.Optionally, modulated for driving the driving voltage of three light sources, to obtain First group of modulation driving voltage, for driving three light source launching electrical levels to become between high level and low level with different frequencies The visible light signal of the RGB color of change.
Some embodiments of the present invention are to separately include red (R), green (G) or blue in the first, second, and third light source It is described in detail in the case where color (B) light-emitting component.It will be understood by those skilled in the art that these rgb light sources are only example Property, the scope of the present invention is not limited thereto.Further, the number of light source is not limited to three.
As shown in Figure 1, executing the step 120 of method 100 after steps described above 110, that is, based on described two Or more modulated drive signal, emit the visible light signal of two or more wavelength, it is described visible to transmit the information The level of optical signal is become between high level and low level with different frequencies and/or different phases and/or different amplitudes Change, the information corresponds to the pattern of the color fringe shown from image acquired in the visible light signal.
An exemplary embodiment of the present invention, the color fringe in described image is from two kinds or more of color fringe pattern What the combination of the visible light signal of kind wavelength obtained.
An exemplary embodiment of the present invention, the information of the pattern corresponding to color fringe include data bit, the number According to number, color, brightness or the data to put in order that position includes corresponding to the color fringe.
Referring again to Fig. 3 A, it is spaced in 1-8 in different times, there is the various combination of the visible light signal of different colours, Generate the different color fringes shown in image.For example, first light source and third light source are to close, institute in time interval 3 The light of transmitting is green, is the color of second light source, obtains correspond to the green light emitted in time interval 3 in the picture Color fringe C, as shown in Figure 3B, wherein indicating different colors with different patterns.In time interval 5, first light source and Second light source is to close, and it is the color of third light source that the light emitted, which is blue, obtains correspond between the time in the picture The color fringe E of the blue light emitted in 5, as shown in Figure 3B.In time interval 7, first light source is to close, and is emitted Light be pink colour, be the blend color of second light source and third light source, in the picture obtain correspond to time interval 7 in sent out The color fringe G for the powder light penetrated, as shown in Figure 3B.
Similarly, it is driven by first group of modulation driving current as shown in Figure 3A, the visible light that three light sources are emitted Signal can have 8 kinds of different combinations in different time intervals 1-8, as shown in Figure 3A.It is raw from 8 kinds of combinations of three light sources At 8 (23=8) pattern of color fringe A-H, as shown in Figure 3B, each striped represent 3 bits (i.e. 000,001,010,011, 100,101,110 or 111), therefore, the information of 8*3=24 bit can be transmitted by the pattern.
An exemplary embodiment of the present invention, the width of striped is determined by the highest frequency in light source in pattern. For example, the width of striped is determined by the frequency of first light source in pattern shown in Fig. 3 B, the frequency of first light source is One, second and third light source in highest frequency.
It is alternatively possible to adjust the frequency of driving signal, otherwise to obtain modulated drive signal.Fig. 4 is basis The schematic diagram of modulated drive signal of the modulation of another exemplary embodiment of the invention for driving light source.As shown in figure 4, adjusting The frequency of the driving signal of each light source is made, so that the driving signal of light source has different frequencies in different time intervals.It can Selection of land, the visible light signal driven by the driving signal of different frequency can represent different symbols, for example, by upper frequency The visible light signal that driving signal is driven can represent symbol " 1 ", be believed by the visible light that the driving signal of lower frequency is driven Number it can represent symbol " 0 ".Compared with Fig. 3 A, the visible light signal that three light sources are emitted can have in different time intervals 1-8 There are more different combinations.From more kinds of combinations of three light sources, the pattern (not shown) of more color fringes is generated, because This, can transmit the information of more bits.
An exemplary embodiment of the present invention can also be obtained by the amplitude of modulated drive signal for driving light source Modulated drive signal.
Fig. 5 is the schematic diagram of the driving signal for driving light source of an exemplary embodiment of the present invention.Pass through tune The amplitude of driving signal processed is obtained for respectively driving the first light comprising red (R), green (G) or blue (B) light-emitting component Source, second light source and third light source driving signal.Three light sources can emit the visible light signal of different colours and varying strength. By the amplitude of the driving signal of modulated light source, the visible light signal with different amplitudes can get.It is driven by first group of modulation Electric current driving, three light sources can distinguish the RGB color that launching electrical level is changed between high level and low level with different amplitudes Visible light signal.
It is driven by first group of modulation driving current, light source can emit the visible light letter of the different colours with different amplitudes Number.It is spaced in 1-8 in different times, there is the various combination of the visible light signal of different colours, generate and shown not in image Same color fringe.For example, the driving current of each light source can be modulated to have 8 kinds of amplification levels in different time intervals. From 0 completely closed state is set as to the fully open state for being set as 1,8 kinds of levels be evenly distributed and be expressed as L1, L2 ..., L7 and L8.Optionally, in OOK modulation, the driving current of each light source can be modulated in different time intervals With 2 kinds of amplification levels, that is, be set as 0 completely closed state to the fully open state for being set as 1.
In time interval 2, first light source R emits the visible light that amplitude is L4, provides visible light signal 1L4；Second light Source G emits the visible light that amplitude is L8, provides visible light signal 2L8；Third light source B emits the visible light that amplitude is L2, provides Visible light signal 3L2.It is the combination of 1L4,2L8 and 3L2 by the visible light signal that three light sources are emitted in time interval 2, Corresponding to a striped in image.
In time interval 5, first light source R emits the visible light that amplitude is L2, provides visible light signal 1L2；Second light Source G emits the visible light that amplitude is L6, provides visible light signal 2L6；Third light source B emits the visible light that amplitude is L8, provides Visible light signal 3L8.It is the combination of 1L2,2L6 and 3L8 by the visible light signal that three light sources are emitted in time interval 5, Corresponding to a striped in image.
Each of three light sources has 8 kinds of different amplification levels, and there are 8 for visible light signal launched by light source3 =512 kinds of different combinations.From 512 kinds of combinations of three light sources, the pattern (not shown) of 512 color fringes is produced, often A striped represents 9 bits.It will be understood by those skilled in the art that the number of light source is not limited to three, it can be two, four or more Multiple light sources.When the light source and each light source for there are n different colours have m kind amplification level, m is producednIt is a different colored The pattern of striped, each striped represent n*log2M bit.
An exemplary embodiment of the present invention can also be obtained by the phase of modulated drive signal for driving light source Modulated drive signal.
Fig. 6 is the schematic diagram of the driving signal for driving light source of an exemplary embodiment of the present invention.Pass through tune The phase of driving signal processed is obtained for respectively driving the first light comprising red (R), green (G) or blue (B) light-emitting component Source, second light source and third light source modulated drive signal.Three light sources can emit the visible light of different colours and out of phase Signal.By the phase of the driving current of modulated light source, the visible light signal with out of phase can get.By first group of modulation Driving current driving, three light sources can distinguish the RGB that launching electrical level is changed between high level and low level with different phases The visible light signal of color.
It is driven by first group of modulation driving current, light source can emit the visible light letter of the different colours with out of phase Number.It is spaced in 1-8 in different times, there is the various combination of the visible light signal of different colours, generate and shown not in image Same color fringe.
For example, as shown in fig. 6, in time interval 1, first light source R is from secretly brightening, and second light source G is from secretly brightening, third Light source B is from bright dimmed, and therefore, the visible light emitted from three light sources becomes yellow from blue.In time interval 3, the first light Source R is from secretly brightening, and second light source G is from bright dimmed, and third light source B is from bright dimmed, therefore, by the transmitting of three light sources visible light from Cyan becomes red.
Each of three light sources has 2 kinds of different variations, that is, from bright dimmed and from secretly brightening, by three light sources There are 2 for the visible light signal of transmitting3=8 kinds of different combinations.From 8 kinds of combinations of three light sources, 8 different colours are produced The pattern (not shown) of striped, each striped represent 3 bits (that is, 000,001,010,011,100,101,110 or 111).This Field can be two, four or more light sources it should be understood to the one skilled in the art that the number of light source is not limited to three.This field skill Art personnel should be understood that the above-mentioned variation of the light source obtained by adjusting driving signal, that is, from bright dimmed and from secretly brightening, only It is the purpose for citing, rather than limiting the invention.According to an embodiment of the invention, by adjusting the phase of driving signal Position, light source can have other variations, for example, from bright to bright and from secretly to dark, the wherein phase invariant of driving signal.When there is n When the light source of a different colours and each light source have the variation of m kind, m is producednThe pattern of a difference color fringe, each striped Represent n*log2M bit.
An exemplary embodiment of the present invention can pass through two kinds in the frequency of modulated drive signal, phase and amplitude Or three kinds, obtain the modulated drive signal for driving light source.
An exemplary embodiment of the present invention can be obtained by the frequency and amplitude of modulated drive signal for driving The modulated drive signal of light source.
Fig. 7 is the signal of the modulated drive signal for driving a light source of an exemplary embodiment of the present invention Figure.By the amplitude of modulated drive signal, modulated drive signal is obtained, so that modulated drive signal has in different time intervals There is different amplitudes.It being driven by this modulation driving current, three light sources can emit the light of varying strength in different time intervals, And the pattern of the striped of different brightness can be taken in the picture, as shown in Figure 8.For example, light source closes in time interval 1 ' It closes, the intensity of light is 0%；Meanwhile the striped A ' that brightness is 0% is obtained in the picture, as shown in Figure 8.In time interval 2 ', The intensity of light is 12.5%；Meanwhile the striped B ' that brightness is 12.5% is obtained in the picture, as shown in Figure 8.In time interval 3 ' In, the intensity of light is 25%；Meanwhile the striped C ' that brightness is 25% is obtained in the picture, as shown in Figure 8, etc..By Fig. 7 institute The visible light signal of the modulated drive signal driving shown, light source transmitting can be generated with 8 kinds not in different time intervals 1 ' -8 ' With the pattern of striped the A '-H ' of luminance level, as shown in Figure 8.
In the case where obtaining the driving signal of three light sources for driving three kinds of colors by modulating frequency, can get Shown in Fig. 323The striped of=8 different colours, each striped represent 3 bits (that is, 000,001,010,011,100,101, 110 or 111), and for driving the amplitude of each driving signal of each light source to be modulated, provide 8 kinds of differences as shown in Figure 8 Luminance level.
Optionally, it can also be obtained by the phase and amplitude of modulated drive signal for driving the modulation of light source to drive letter Number.
Fig. 9 is the schematic diagram of the modulated drive signal for driving light source of an exemplary embodiment of the present invention.It is logical The phase and amplitude of ovennodulation driving signal, acquisition include red (R), green (G) or blue (B) luminous member for respectively driving First light source, the modulated drive signal of second light source and third light source of part.Three light sources can emit different colours, different amplitudes With the visible light signal of out of phase.By the phase and amplitude of the driving current of modulated light source, can get has out of phase With the visible light signal of amplitude.It is driven by first group of modulation driving current, light source can emit with out of phase and different amplitudes Different colours visible light signal.It is spaced in 1-8 in different times, there is different groups of the visible light signal of different colours It closes, generates the different color fringes shown in image.
For example, first light source R emits the visible light that amplitude is L5 in time interval 3, visible light signal 1L5 is provided；The Two light source G emit the visible light that amplitude is L3, provide visible light signal 2L3；Third light source B emits the visible light that amplitude is L3, Visible light signal 3L3 is provided；Meanwhile first light source R is from secretly brightening, second light source G is from bright dimmed, and third light source B is from bright dimmed. It therefore, is the combination of the visible light signal of different colours by the visible light signal that three light sources emit in time interval 3, it is raw At the specific color fringe shown in image.
In time interval 7, first light source R emits the visible light that amplitude is L5, provides visible light signal 1L5；Second light Source G emits the visible light that amplitude is L7, provides visible light signal 2L7；Third light source B emits the visible light that amplitude is L4, provides Visible light signal 3L4；Meanwhile first light source R is from secretly brightening, second light source G is from bright dimmed, and third light source B is from secretly brightening.Cause This is the combination of the visible light signal of different colours by the visible light signal that three light sources emit, generates in time interval 7 Another the specific color fringe shown in image.
Each of three light sources has 512 kinds of different combinations by modulation amplitude, and each passes through modulation phase Position all has 2 kinds of different variations (that is, from bright dimmed and from secretly brightening), is spaced in 1-8 in different times by three light sources The visible light signal emitted the combination different there are 512*8=4096 kind.From 4096 kinds of combinations of three light sources, produce The pattern (not shown) of 4096 different color fringes, each striped represent 12 bits.It will be understood by those skilled in the art that light The number in source is not limited to three, can be two, four or more light sources.When the light source and each light for having n different colours When there is m kind to change in source, by modulation amplitude and phase, m is producednThe pattern of a different color fringe, each striped generation Table n*log2M bit.
Optionally, it can also be obtained by the frequency and amplitude of modulated drive signal for driving the modulation of light source to drive letter Number.
Figure 10 is the schematic diagram of the modulated drive signal for driving light source of an exemplary embodiment of the present invention.It is logical The frequency and amplitude of ovennodulation driving signal, acquisition include red (R), green (G) and blue (B) luminous member for respectively driving First light source, the modulated drive signal of second light source and third light source of part.Three light sources can emit different colours, different amplitudes With the visible light signal of different frequency.By the frequency and amplitude of the driving current of modulated light source, visible light signal can get.It is logical After the amplitude for modulating driving current in the time interval, three light sources can emit the visible light of the different colours with different brightness Signal.Meanwhile the frequency by modulating driving current, time that light source changes between light and dark can be controlled in the time interval Number.Optionally, when light source is become between light and dark with the frequency of the sample frequency lower than imaging sensor in a time interval Change, for example, only in the image captured by imaging sensor, generating a brightness from secretly changing once to bright and corresponding to the time The color fringe of the amplitude of the high level of driving current or a low level corresponding to driving current in the time interval in being spaced Dark fringe.Optionally, when light source is in a time interval with the frequency of the sample frequency higher than imaging sensor light and dark Between change, in captured image, generate a brightness and correspond to lower than the high level of driving current in the time interval The color fringe of intermediate amplitude.It is driven by first group of modulation driving current, light source can emit with different frequency and different amplitudes Different colours visible light signal.It is spaced in 1-8 in different times, there is different groups of the visible light signal of different colours It closes, generates the different color fringes shown in image.
For example, first light source R emits the visible light that amplitude is L8 in time interval 2, visible light signal 1L8 is provided；The Two light source G emit the visible light that amplitude is L5, provide visible light signal 2L5；Third light source B emits the visible light that amplitude is L3, Visible light signal 3L3 is provided；In time interval 2, first light source R has low frequency and slowly changes between light and dark, Second light source G, which has, low frequency and slowly to be changed between light and dark, third light source B there is high-frequency and rapidly bright and Change between dark.It is the group of the visible light signal of different colours by the visible light signal that three light sources emit in time interval 2 It closes.Third light source B rapidly changes between light and dark, generates a brightness in the picture and corresponds to lower than drive in time interval 2 The color fringe of the intermediate amplitude of the high level of streaming current.First light source and second light source are in time interval 2 slowly bright And it is dark between change, generate one in the picture from the color fringe secretly to brighten.
In time interval 5, first light source R emits the visible light that amplitude is L6, provides visible light signal 1L6；Second light Source G emits the visible light that amplitude is L8, provides visible light signal 2L8；Third light source B emits the visible light that amplitude is L8, provides Visible light signal 3L8；In time interval 5, first light source R has low frequency and slowly changes between light and dark, second Light source G, which has, low frequency and slowly to be changed between light and dark, third light source B have low frequency and slowly it is light and dark it Between change.It is the combination of the visible light signal of different colours by the visible light signal that three light sources emit in time interval 5, Another specific color fringe is generated in the picture, its color is variation in time interval 5.
512 kinds of different combinations by modulation amplitude and 8 kinds of different combinations by modulating frequency, by three light Source is spaced the visible light signal emitted in 1-8 the combination different there are 512*8=4096 kind in different times.From three light 4096 kinds of combinations in source, produce the pattern (not shown) of 4096 different color fringes, each striped represents 12 bits.This Field can be two, four or more light sources it should be understood to the one skilled in the art that the number of light source is not limited to three.When not having n not With color light source and each light source there is m kind to change when, by modulation amplitude and frequency, produce mnA different color-bar The pattern of line, each striped represent n*log2M bit.
Optionally, it can also be obtained by the frequency and phase of modulated drive signal for driving the modulation of light source to drive letter Number.
Figure 11 is the schematic diagram of the modulated drive signal for driving light source of an exemplary embodiment of the present invention.It is logical The frequency and phase of ovennodulation driving signal, acquisition include red (R), green (G) and blue (B) luminous member for respectively driving First light source, the modulated drive signal of second light source and third light source of part.Three light sources can emit different colours, out of phase With the visible light signal of different frequency.By the frequency and phase of the driving current of modulated light source, visible light signal can get.It is logical After the phase for modulating driving current in the time interval, controllable light source transmitting is from bright dimmed and from the visible light letter secretly to brighten Number.Meanwhile the frequency by modulating driving current, time that light source changes between light and dark can be controlled in the time interval Number.Optionally, when light source lower than the frequency of imaging sensor sample frequency between light and dark in a time interval to change, For example, only in the image captured by imaging sensor, generating a brightness from secretly changing once to bright and corresponding to the time interval The color fringe of the amplitude of the high level of interior driving current one corresponds to the low level dark of driving current in the time interval Striped.Optionally, when light source is in a time interval with the frequency of the sample frequency higher than imaging sensor between light and dark Variation generates a brightness and corresponds to the centre lower than the high level of driving current in the time interval in captured image The color fringe of amplitude.It is driven by first group of modulation driving current, light source can emit with different frequency and out of phase not With the visible light signal of color.It is spaced in 1-8 in different times, there is the various combination of the visible light signal of different colours, it is raw At the different color fringes shown in image.
For example, in time interval 2, first light source R has high-frequency and from bright dimmed, and second light source G has high-frequency And from bright dimmed, third light source B has high-frequency and from secretly brightening.In time interval 2, by the visible light of three light sources transmitting Signal is the combination of the visible light signal of different colours, generates specific color fringe in the picture, its face in time interval 2 Color is variation.
In time interval 3, first light source R has high-frequency and from bright dimmed, and second light source G has high-frequency and from bright Dimmed, third light source B has low frequency and from secretly brightening.In time interval 3, it is by the visible light signal that three light sources emit The combination of the visible light signal of different colours generates another specific color fringe in the picture, its face in time interval 3 Color is variation.
In time interval 6, first light source R has high-frequency and from secretly brightening, and second light source G has low frequency and from dark It brightens, third light source B has low frequency and from bright dimmed.In time interval 6, it is by the visible light signal that three light sources emit The combination of the visible light signal of different colours generates the different color fringes shown in the picture, its face in time interval 6 Color is variation.
By phase modulation, each of three light sources can provide 2 from bright dimmed or from secretly brightening3=8 kinds different Variation.By modulating frequency, each of three light sources can have low frequency or high-frequency, provide 23=8 kinds of different changes Change.
An exemplary embodiment of the present invention, in addition to the information of data bit, the pattern corresponding to color fringe further includes One or more start bits and/or one or more error correction bits.Start bit can be used to identify the initial position of one group of data bit, entangle Dislocation can be used for checking the mistake in the data bit.
Figure 12 is the schematic diagram of the information of the pattern corresponding to color fringe of an exemplary embodiment of the present invention, Including a start bit.As shown in figure 12, a start bit is added in the starting position of data bit.Alternatively it is also possible to include Multiple start bits.
Figure 13 is the schematic diagram of the information of the pattern corresponding to color fringe of an exemplary embodiment of the present invention, Including a start bit and an error correction bit.As shown in figure 13, in addition to start bit, error correction can also be added in the end of data bit Position.It is alternatively possible to include multiple error correction bits.It is alternatively possible to which one or more error correction bits are added to data bit, and it is not added Enter start bit.
An exemplary embodiment of the present invention, first group of modulation driving current are respectively greater than unmodulated driving electricity Stream is driven so that being equal to by the luminous flux of the light source of first group of modulation driving current driving by the unmodulated driving current The luminous flux of dynamic light source.
Luminous flux is the amount of the power of the light of unit time inner light source transmitting, and with the area under driving current wave at just Than human eye is sensitive to the variation of luminous flux.Light source can be driven with the first modulation driving current for being greater than unmodulated driving current, So that the luminous flux of light source entire information transmit during be it is constant, to avoid flashing.
Figure 14 A is the modulation driving of the light source equal to unmodulated driving current according to an illustrative embodiment of the invention The schematic diagram of electric current.The luminous flux that may be assumed that the light source driven by unmodulated driving current is 100%.Assuming that modulation driving current High level and low level width be 0.1ms respectively, and modulate driving current be equal to unmodulated driving current, then by Figure 14 A Shown in the luminous flux of light source that is driven of modulation driving current can be calculated as (0.1*0+0.1*1) * 100%/(0.1+0.1) =50%.The luminous flux 50% of the light source driven by modulation driving current is lower than the light source driven by unmodulated driving current Luminous flux (100%), lead to the undesirable light source scintillation that can be experienced by human eye.
Figure 14 B is the modulation driving current greater than unmodulated driving current according to an illustrative embodiment of the invention Schematic diagram.It will again be assumed that the high level and low level width of modulation driving current are 0.1ms respectively, and modulating driving current is not The luminous flux of twice for modulating driving current, the then light source that modulation driving current is driven as shown in Figure 14 B can be calculated as (0.1*0+0.1*2) * 100%/(0.1+0.1)=100%.By the luminous flux 100% for the light source that modulation driving current is driven Equal to the luminous flux of the light source driven by unmodulated driving current, the undesirable light source that avoiding can be experienced by human eye dodges It is bright.It should be understood that numerical value provided by an exemplary embodiment of the present invention is theoretical value for illustration purposes, rather than it is real Border numerical value.Actual numerical value can change because of distinct device parameter.
An exemplary embodiment of the present invention, optionally, method 100 may include step: based on high frequency carrier letter Number second group of modulation driving current, emit the visible light signal, second group of modulation driving current is greater than unmodulated drive Streaming current, so that including in high level and low level each period by the light source of second group of modulation driving current driving Luminous flux is constant
Figure 14 C is the tune greater than unmodulated driving current of no high-frequency carrier signal according to an exemplary embodiment of the present invention Driving current processed.As shown in Figure 14 C, driving current can be modulated to the difference arranged including different high level and low level Period, to represent different symbols.Optionally, in different cycles, high level and low level can have the different duration, To transmit different symbols, causes the luminous flux of the power supply driven by modulation driving current different, cause light source scintillation.Example Such as, as shown in Figure 14 C, in a cycle T1 for representing symbol " 1 ", driving current is modulated into high level total duration and isLuminous flux is 50%；In another cycle T 2 for representing symbol " 0 ", driving current is modulated into high electricity Flat total duration isLuminous flux is 66.7%.Therefore, the luminous flux in the T1 of transmitted symbol " 1 " is small Luminous flux in the T2 of transmitted symbol " 0 ", leads to light source scintillation.
In order to avoid the flashing of the light source when transmitting different symbols, the driving current greater than unmodulated driving current is further It is modulated with high-frequency carrier signal.By being modulated with high-frequency carrier signal, in different cycles, it is used for transmission the driving of different symbols The duration of the high level of electric current is identical with the low level duration, then is including high level and low level each week Luminous flux in phase is constant, thus avoids light source scintillation.For example, as shown in fig. 14d, at one of transmitted symbol " 1 " In cycle T 1, driving current is further modulated into high level total duration with high-frequency carrier signal and is Luminous flux is 33.3%；In a cycle T2 of transmitted symbol " 0 ", driving current quilt Further being modulated into high level total duration with high-frequency carrier signal isLuminous flux is 33.3%.Therefore, the luminous flux in the T1 of transmitted symbol " 1 " is equal to the luminous flux in the T2 of transmitted symbol " 0 ", and avoiding can quilt The undesirable light source scintillation that human eye detection arrives.
It will be understood by those skilled in the art that the high level and low level frequency, waveform or width of modulation driving current are simultaneously It is not limited to the numerical value of above-mentioned example, and can according to need and be arranged to any numerical value.Similarly, the height electricity of high-frequency carrier signal The numerical value of gentle low level frequency, waveform or width it is not limited to the above example property, and can according to need be arranged to it is any Numerical value.
According to the second aspect of the invention, a kind of method for obtaining information using visible light signal is provided.Figure 15 is root Letter is obtained using the visible light signal of two or more wavelength from light source according to the explanation of exemplary embodiments of the present invention The flow chart of the method 200 of breath.
As shown in figure 15, method 200 starts from step 210, from the described of two or more wavelength that light source emits Optical signal obtains image, and the level of the visible light signal is with different frequencies and/or different phases and/or different amplitudes Change between high level and low level.
An exemplary embodiment of the present invention, as described in detail in the content previously with respect to method 100, it is seen that Optical signal, which can be, to be emitted by the light source based on modulated drive signal, and modulated drive signal drives the light source transmitting visible Optical signal, the level of the visible light signal is with different frequencies and/or different phases and/or different amplitudes in high level Change between low level.
An exemplary embodiment of the present invention can lead to as described in detail in the content previously with respect to method 100 The frequency and/or phase and/or amplitude of ovennodulation driving signal obtains modulated drive signal, for driving light source transmitting visible Optical signal.It is alternatively possible to the driving signal of PWM method modulated light source.Optionally, modulated drive signal can be modulation and drive Streaming current or modulation driving voltage.
Optionally, as described in detail in the content previously with respect to method 100, with reference to Figure 14 B, driving current is modulated Unmodulated driving current can be greater than, so that the luminous flux of the light source driven by modulation driving current is equal to by the unmodulated electric current The luminous flux of the light source of driving.
Optionally, it as described in detail in the content previously with respect to method 100, with reference to Figure 14 C and 14D, can be based on Modulation driving current with high frequency carrier emits visible light signal, and modulation driving current is greater than unmodulated signal, so that by this The light source for modulating driving current driving is being constant including the luminous flux in high level and low level each period.
The above exemplary embodiments previously with respect to being described in detail in the content of method 100, exist for brevity This is repeated no more.
An exemplary embodiment of the present invention, the image acquired in the visible light signal can be comprising color fringe The image of pattern.For example, image may include colour for the light source comprising red (R), green (G) or blue (B) light-emitting component The image of (red, green, yellow, blue, powder, blueness, white, black) candy strip, wherein different colors is represented comprising information to be transmitted not Same code, as shown in figure 16.
An exemplary embodiment of the present invention, step 210 may include by the image capturing device including imaging sensor Described image is obtained, the exposure mode of described image sensor is rolling shutter mode, and the sample frequency of Rolling shutter is higher than The frame rate of described image sensor.Image capturing device is used to shoot the image that the visible light signal emitted from light source obtains. Image capturing device can be smart phone, laptop or other electronic equipments with camera.Optionally, image is clapped Take the photograph the embedded system that device can be integrated in other equipment or object, such as jewelry, key, card, pen etc..Image sensing Device can be light-sensitive element.
An exemplary embodiment of the present invention is the imaging sensor of Rolling shutter, image sensing for exposure mode The different piece of device, every a line or each column can be exposed in different time.When the modulated drive signal institute of shooting as shown in Figure 2 When the image of the fast-changing light source of driving, imaging sensor can obtain pattern as shown in Figure 3 including color fringe Image.Optionally, when the image of the fast-changing light source driven when the modulated drive signal of shooting as shown in Figure 7, figure As sensor can obtain the image of the pattern of the color fringe including different luminance levels as shown in Figure 8.
Exemplary embodiment according to the present invention, the sample frequency of Rolling shutter are higher than the frame rate of imaging sensor, To obtain the clear image for including color fringe pattern, wherein each striped corresponds to every a line.For example, working as imaging sensor Frame rate be 30Hz and resolution ratio is 640*480, the time needed for shooting an image is 1s/30Hz=0.033s= 33ms, and the time needed for the every a line of shooting is 33ms/480=69us.In order to obtain comprising color fringe pattern clearly Image, wherein each striped corresponds to every a line, the time for exposure of every a line is less than 69us and sample frequency is higher than 30Hz.
An exemplary embodiment of the present invention, step 210 can include: clapped on the imaging sensor with Rolling shutter Described image is taken the photograph, wherein the different piece of described image sensor exposes in different time points.Optionally, imaging sensor can be with It is complementary metal oxide semiconductor (CMOS) imaging sensor or charge-coupled device (CCD) imaging sensor.
As shown in figure 15, after abovementioned steps 210, the step 220 of method 200 is executed, measurement is believed from the visible light Number obtain described image in color fringe pattern.
An exemplary embodiment of the present invention, can be by, for example, image processor or general processor, to measure from can The pattern of color fringe in the image of light-exposed signal acquisition.After image projection to image sensor surface, imaging sensor will The optical signal detected is converted to electric signal.By the analog-digital converter (ADC) of imaging sensor or processor by telecommunications Number be converted to digital signal.Processor digital signal for further processing, and digital picture is generated, it can be over the display Display.Optionally, the Digital Signal Processing (DSP) of processor can be used for handling digital signal and generate digital picture.
As shown in figure 15, after above-mentioned steps 220, the step 230 of method 200 is executed, obtains and corresponds to the color-bar The information of the pattern of line.
The information of an exemplary embodiment of the present invention, the pattern corresponding to the color fringe can be any type Information, for example, data, such as text, image, audio, video data, the identifier or other information of light source.
An exemplary embodiment of the present invention, the color fringe in described image be from two or more wavelength can What the combination of light-exposed signal obtained.An exemplary embodiment of the present invention, decodable code, optionally, from two or more waves What the combination of long visible light signal obtained, the information of the pattern corresponding to color fringe.In this way, it can restore visible The initial information of optical signal carrying.
As shown in figure 3, from three light sources of visible light driven respectively by modulated drive signal, transmitting RGB color, Produce the image shot by imaging sensor.When decoding corresponds to the information of the pattern of color fringe, to captured figure The analysis of picture is the measurement based on these three colors.For example, striped A is related to the first signal, the brightness of three kinds of colors is respectively 0%, 0%, 0%, decoded waveform corresponds to the waveform in time interval 1 shown in Fig. 2；Striped B is related to second signal, and three The brightness of kind color is respectively 100%, 0%, 0%, and decoded waveform corresponds to the waveform in time interval 2 shown in Fig. 2； Striped C is related to third signal, and the brightness of three kinds of colors is respectively 0%, 100%, 0%, and decoded waveform corresponds to shown in Fig. 2 Time interval 3 in waveform.Similarly, other stripeds of decodable code, to obtain transmitted information.
An exemplary embodiment of the present invention, as shown in figure 8, being driven from by the modulation of the amplitude by modulated drive signal The light source that dynamic signal is driven, produces the image shot by imaging sensor.When decoding corresponds to the pattern of color fringe When information, the analysis to captured image is the measurement based on brightness.For example, striped A ' is related to the first letter that brightness is 0% Number, decoded waveform corresponds to the waveform in time interval 1 ' shown in Fig. 7；Striped B ' is related to second that brightness is 12.5% Signal, decoded waveform correspond to the waveform in time interval 2 ' shown in Fig. 7；Striped C ' is related to the third that brightness is 25% Signal, decoded waveform correspond to the waveform in time interval 3 ' shown in Fig. 7.Similarly, other stripeds of decodable code, to obtain Take transmitted information.
Image captured by imaging sensor is in the case where generation from three light sources of three kinds of colors, wherein by such as The frequency of the driving signal of three light sources is modulated in modulation driving shown in Fig. 2, while by modulating each light source as shown in Figure 8 The amplitude of modulated drive signal can obtain 64 with different colours and/or brightness in the image captured by imaging sensor The pattern of a striped.When decoding corresponds to the information of the pattern of 64 stripeds, the analysis to captured image is based on upper State the measurement of these three colors and brightness.
An exemplary embodiment of the present invention, the light source are one or more groups of light sources, and image obtained can have One or more exposure areas, each exposure area may include the pattern of the striped corresponding to one group of light source.
Figure 17 is an exemplary embodiment of the present invention comprising the one or more corresponding to one or more groups of light sources The schematic diagram of the image of exposure area.In Figure 17, there are three exposure areas for acquired image tool, and each exposure area includes The pattern of striped as shown in figure 16 corresponds to one group of three kinds of colors that modulated drive signal as shown in Figure 2 is driven Light source.
Step 210 can include: the visible light signal emitted from the one or more groups of light sources obtains image, it is described can The level of light-exposed signal is with different frequencies and/or different phases and/or different amplitudes between high level and low level Variation, wherein one or more exposure areas in described image correspond to one or more groups of light sources.Can by with such as before The slave one group of light source obtains the similar mode of mode of image, has one or more acquired in one or more groups of light sources The image of a exposure area, image as shown in figure 17, for brevity, details are not described herein.Further, step 220 can include: the pattern of one or more color fringe of exposure area in measurement described image.It can be by such as The preceding similar fashion, measurement correspond to the pattern of the color fringe of each exposure area of every group of light source.Such as it can lead to The similar fashion as shown in 16 is crossed, measures each exposure for corresponding to every group of light source of three kinds of colors shown in Figure 17 respectively The pattern of the color fringe in region, for brief purpose, details are not described herein.Further, step 230 can include: obtain The information of the color fringe pattern corresponding to one or more exposure area in described image.It can be by such as The preceding similar mode from one group of light source, to obtain the pattern of the color fringe corresponding to each exposure area respectively Information.For example, can obtain correspond to three kinds of colors shown in Figure 17 respectively by similar fashion as shown in Figure 16 Every group of light source each exposure area color fringe pattern information, for brief purpose, details are not described herein.
When the plane out of plumb of incident light and imaging sensor, the light spot shape projected on the image sensor may become Shape, such as become ellipse from circle.In this case, accelerometer, gravity sensor, angular transducer, gyro can be used Instrument or magnetometric sensor measure tilt angle, can be used for obtaining the colour for corresponding to one or more exposure areas in image The information of the pattern of striped.
According to the third aspect of the invention we, a kind of visible light signal transmission letter using two or more wavelength is provided The light source 300 of breath.As shown in figure 18, light source 300 can be lamp, such as LED light, LED backlight, LED planar lamp etc..But Light source 300 is not limited to above-described embodiment, and can be any light source that can transmit visible light signal.
As shown in figure 18, light source 300 may include modulator 310 and transmitter 320.Modulator 310 can be by constant electricity Stream, constant voltage, constant electric power, constant optical power electric signal, or the modulation that is driven of electric signal modulated by PWM method Device.Transmitter 320 can be the LED that can emit different colours visible light signal, and different colours depend on emitted visible light The wavelength of signal, for example, wavelength is the feux rouges of 640-780nm, wavelength is the green light of 505-525nm, and wavelength is 470-505nm's Blue light.Unidirectional LED is driven, transmitter 320, which can be, connects into a string of one or more LED, including 1 to 12 LED. Optionally, transmitter 320 can be the one or more LED for connecting into and going here and there more, wherein including for every a string 1 to 12 LED.According to Exemplary embodiment of the present invention, transmitter 320 include multiple LED.But modulator 310 or transmitter 320 be not limited to it is above-mentioned Embodiment, and can be any modulator or transmitter.
Modulator 310 can be used for modulating two or more driving signals of the light source based on information to be transmitted, with Obtain two or more modulation driving letters of the visible light signal for driving the light source to emit two or more wavelength Number, the level of the modulated drive signal with different frequencies and/or different phases and/or different amplitudes in high level and Change between low level.
Transmitter 320 can be used for emitting two or more wavelength based on the two or more modulated drive signals Visible light signal, to transmit the information, the level of the visible light signal is with different frequencies and/or different phases And/or different amplitudes changes between high level and low level, the information corresponds to acquired in the visible light signal Image in the pattern of color fringe that shows.
An exemplary embodiment of the present invention, modulator 310 can be used for modulating the light source based on information to be transmitted Two or more driving voltages or two or more driving currents, to obtain first group of modulation driving voltage or first group Modulate driving current.
An exemplary embodiment of the present invention, first group of modulation driving current are respectively greater than unmodulated driving current, make The luminous flux of light source that drive by first group of modulation driving current equal to being driven by the unmodulated driving current The luminous flux of light source.
An exemplary embodiment of the present invention, transmitter 320 can be used for based on second group with high-frequency carrier signal Driving current to be modulated, the visible light signal is emitted, second group of modulation driving current is greater than unmodulated driving current, so that Light source by second group of modulation driving current driving is being permanent including the luminous flux in high level and low level each period Fixed.
An exemplary embodiment of the present invention, the information of the pattern corresponding to color fringe include data bit, the number According to number, color, brightness or the data to put in order that position includes corresponding to the color fringe.
An exemplary embodiment of the present invention, the information of the pattern corresponding to color fringe further include one or more rise Beginning position and/or one or more error correction bit, the initial position of one or more of start bits one group of data bit for identification, institute One or more error correction bits are stated for checking the mistake in the data bit.
An exemplary embodiment of the present invention, modulator 310 can be used for modulating the two or more driving signals Frequency and/or phase and/or amplitude, to obtain two or more modulated drive signals.
An exemplary embodiment of the present invention, the color fringe in described image be from two or more wavelength can What the combination of light-exposed signal obtained.
According to the present invention, the detailed description for being previously with regard to method 100 is equally applicable to the embodiment of light source 300, for letter The purpose wanted, details are not described herein.Specifically, the step 110 in method 100 can be executed by modulator 310, in method 100 Step 120 can be executed by transmitter 320.
According to the fourth aspect of the invention, it provides a kind of for from two or more wavelength from light source The device 400 of optical signal acquisition information.For example, the device can be the mobile device including camera, for example, it is smart phone, flat Plate computer, laptop or other electronic equipments.But device 400 is not limited to these embodiments, and can be with photosensitive Any electronic equipment of element.
As shown in figure 18, the device 400 for obtaining information from visible light signal may include imaging sensor 410, storage Device 420 and processor 430.Imaging sensor 410 can be, for example, camera, photodiode, photodiode array.It deposits Reservoir 420 can be volatile memory, nonvolatile memory etc..Processor 430 can be general processor, dedicated processes Device etc..
The visible light signal acquisition figure for two or more wavelength that imaging sensor 410 can be used for emitting from light source Picture, the level of the visible light signal is with different frequencies and/or different phases and/or different amplitudes in high level and low Change between level.Memory 420 can be used for storing the image of described image sensor acquisition；And processor 430 can be used for The pattern of color fringe in the described image of measurement storage in the memory, and obtain and correspond to the color fringe The information of pattern.
An exemplary embodiment of the present invention, the exposure mode of described image sensor are rolling shutter modes, and are rolled up The sample frequency of curtain shutter is higher than the frame rate of described image sensor.
An exemplary embodiment of the present invention, described image sensor 410 are the imaging sensors with Rolling shutter And for obtaining image from visible light signal, wherein the different piece of described image sensor exposes in different time points.It is optional Ground, imaging sensor 410 can be complementary metal oxide semiconductor (CMOS) imaging sensor or charge-coupled device (CCD) Imaging sensor.
An exemplary embodiment of the present invention, the visible light signal are that modulation driving letter is based on by the light source 300 Number and emit, the modulated drive signal drives the light source to emit the visible light signal, the electricity of the visible light signal It is flat to be changed between high level and low level with different frequencies and/or different phases and/or different amplitudes.
An exemplary embodiment of the present invention, the light source 300 is one or more groups of light sources, and described image senses Device 410 is used to obtain image from the visible light signal that one or more groups of light sources emit, wherein one in described image A or multiple exposure areas correspond to one or more groups of light sources；The memory 420 is for storing described image sensor The image of acquisition；And the processor 430 is used to measure the coloured silk of one or more exposure area in described image The pattern of vitta line, and obtain the color fringe image for corresponding to one or more exposure area in described image The information of case.
An exemplary embodiment of the present invention, the color fringe in described image be from two or more wavelength can What the combination of light-exposed signal obtained.
According to the present invention, the detailed description for being previously with regard to method 200 is equally applicable to the embodiment of device 400, for letter The purpose wanted, details are not described herein.Specifically, the step 210 in method 200 can be executed by imaging sensor 410, method 200 In step 220 and 230 can be executed by processor 430.
An exemplary embodiment of the present invention, device 400 may include multiple images sensor, as shown in figure 19.When When using multiple images sensor in device, need to predefine which imaging sensor activated.Optionally, strategy can be as Under: activate all imaging sensors；Imaging sensor of the imaging sensor for receiving optical signal first as activation is selected, and Close other imaging sensors.Optionally, strategy can be the imaging sensor for manually selecting that an imaging sensor is activation.It can Selection of land, strategy can be the information based on other imaging sensors or processor collection, select an imaging sensor for activation Imaging sensor, to obtain the information for corresponding to the pattern of color fringe in one or more exposure areas in image.
An exemplary embodiment of the present invention can be used software program triggering for obtaining information from visible light signal Imaging sensor in device, to start to receive visible light signal.Optionally, during shooting image, acquired in it Realtime graphic and information can be displayed in the software program, as shown in FIG. 20 A.Optionally, during shooting image, can only have It is shown in the software program from the information obtained in image, as shown in fig. 20b.
An exemplary embodiment of the present invention utilizes the light of the visible light signal transmission information of two or more wavelength Source includes modulator and transmitter according to the present invention, and light source may include in the transmitter, as shown in figure 21.The transmitter is also It may include power supply and microprocessor, such as micro controller unit.Before transmitter prepares transmitting visible light signal, it should mention Preceding activation imaging sensor.Optionally, activation signal can be sent to activate imaging sensor, as shown in figure 21 by transmitter. Activation can be realized by software-based switch.When the switch is opened, imaging sensor starts to receive visible light signal. Optionally, imaging sensor can be activated otherwise.For example, when software brings into operation, while activating imaging sensor. Optionally, it can also be activated by other switches, sensor or network implementations.
An exemplary embodiment of the present invention, when activating imaging sensor to receive visible light signal, notice transmitting Device sends visible light signal.This can be realized by the hardware based switch installed in transmitter, as shown in figure 22.Work as switch When unlatching, transmitter starts to send visible light signal；When the switch is closed, transmitter stops sending visible light signal.Optionally, It can be by other methods, for example, button, physical contact, sensor and network notify sensor.
Light-sensitive unit can be integrated among transmitter with detection image sensor by an exemplary embodiment of the present invention State, for example, imaging sensor whether prepare shoot image.Before transmitter sends visible light signal, the photosensitive dress Set the state that can first check for imaging sensor.Optionally, when imaging sensor prepares shooting image, the hair of imaging sensor Optical element is with certain frequency shift brightness, and the light-sensitive unit integrated in transmitter can detect the variation of the brightness；So Transmitter starts to send visible light signal afterwards, as shown in figure 23.Optionally, can by other sensors, such as sound transducer, The state of the detection images sensor such as gravity sensor, accelerometer.Optionally, other methods, such as Network adaptation can be passed through Device, such as GPRS, GSM, CDMA, WiFi, Zigbee, the state of the detection images sensor such as Bluetooth, RFID.
An exemplary embodiment of the present invention, transmitter can transmit a plurality of types of information, including but not limited to, transmitting The information such as mark, sound, document, audio, picture, the video of device can store in memory, as shown in figure 24.
An exemplary embodiment of the present invention, transmitter may include light source according to the present invention, microprocessor (for example, Microcontroller (MCU)) and battery, as shown in figure 25.Tune of the microprocessor to driving current/voltage code of light source, in light source Device processed can transmitter in driving current/voltage and light source based on modulates information light source to be transmitted can be based on being modulated Driving current/voltage discharge visible light signal.Light source can be the visible light letter for emitting two or more wavelength (color) Number two or more light sources.The battery can be used to provide energy for light source and microprocessor.Optionally, such as Figure 25 institute Show, transmitter may also include for charging for battery or protecting battery to prevent the charging circuit of surcharge or overheat etc..
An exemplary embodiment of the present invention, transmitter may also include sensor, as shown in figure 26.The sensor can For measuring parameters of electric power, such as temperature, humidity, voltage and electric current or biological parameter, as mankind's HR Heart Rate, body temperature with And blood pressure.
An exemplary embodiment of the present invention, transmitter may also include memory, as shown in figure 27.The memory is used In storage information, such as information of pre-stored data and sensor collection.
An exemplary embodiment of the present invention, transmitter may also include display, as shown in figure 27.The display is used In the transmitted information of display.
An exemplary embodiment of the present invention, the device for obtaining information may include imaging sensor, microprocessor (such as MCU) and power supply, as shown in figure 28.Described image sensor is used for the visible light signal of photographic light sources transmitting.Institute Microprocessor is stated for measuring the pattern for the color fringe for including in captured image and corresponds to color fringe for obtaining Pattern information.The power supply is used to provide energy for microprocessor.
An exemplary embodiment of the present invention, as shown in figure 28, for obtain from two or more wavelength can The device of the information of light-exposed signal may also include communication module.The communication module can be it is wired or wireless, and can For the data transmission between described device and other electronic equipments, or for attaching the device to internet.
An exemplary embodiment of the present invention, transmitter can be the lamp including multiple color light sources.The transmitter The embedded system that can be integrated in other devices, such as an integration section of ring, as shown in figure 29.
An exemplary embodiment of the present invention, the system transmitted using visible light signal and obtain information includes according to this The light source of the visible light signal transmission information using two or more wavelength of invention and from two or more from light source The visible light signal of kind wavelength obtains the device of information；The basic functional principle of the foundation of the system is as follows: the image in device The visible light signal of sensor photographic light sources transmitting, and obtain the processor measurement image in image and device from it and prize The pattern of vitta line, and restore the information for corresponding to the pattern of color fringe.
An exemplary embodiment of the present invention, the transmitter can be integrated among wearable electronic device, provide body The advantages of product small, easy to carry and low-power consumption.The wearable electronic device can be jewelry, as ring, earrings, necklace, Wrist-watch etc., or can be key, block, pen etc..It is described to wear when the transmitter is integrated among wearable electronic device Wearing electronic equipment can emit the visible light signal for being used for transmission information.
An exemplary embodiment of the present invention, the transmitter can be integrated among wearable electronic device, such as by electricity Battery-powered ring, as shown in figure 30.It should be pointed out that the ring is merely to illustrate the present invention, it is not construed as to this hair Bright limitation.The battery is used to provide energy for transmitter.The light source that the transmitter includes can emit two or more The visible light signal of wavelength (color) can independently modulate each light source.
An exemplary embodiment of the present invention, the transmitter may include two or more that can emit visible light signal A light source, the visible light signal can have two or more wavelength (color), i.e. color 1, color 2 ... and color n, such as scheme Shown in 31.The combination of each color or various colors represents unique data code.As above words, the transmitter can integrate Among wearable electronic device.
An exemplary embodiment of the present invention, the transmitter may also include driver, as shown in figure 32.Such as institute above Speech, the transmitter can be integrated among wearable electronic device.The driver is for driving light source.The driver can mention For bigger driving current or driving voltage to drive high power light source.By this method, the biography for improving transmitter can be increased Defeated distance.
An exemplary embodiment of the present invention, the transmitter may also include battery charger, as shown in figure 33.Such as It is sayed above, the transmitter can be integrated among wearable electronic device.The charging circuit is applied not only to charge for battery, And for limiting charging current/voltage or inspection temperature etc., to avoid battery surcharge or overheat.Optionally, charging electricity Road can be powered by external power supply, such as power network, solar panel, generator or energy collection system.Optionally, charging circuit It can be wireless charging system.
An exemplary embodiment of the present invention, the transmitter may also include memory, as shown in figure 34.Institute as above Speech, the transmitter can be integrated among wearable electronic device.The memory is for storing information, such as the number stored in advance According to and imaging sensor collected by information.
An exemplary embodiment of the present invention, the transmitter may also include sensor, as shown in figure 35.Institute as above Speech, the transmitter can be integrated among wearable electronic device.The sensor can be used for measurement parameter, as temperature, humidity, Voltage and current or biological parameter, such as mankind's HR Heart Rate, body temperature and blood pressure.The sensor can be temperature sensor, wet Spend sensor, optical sensor, sound transducer, accelerometer, pressure sensor etc..The transmitter may also include voltage/electricity Inductive circuit is spread, the circuit is used to detect the state of battery.When detecting that battery capacity is low, the sensor can pass through light Signal, sound and vibration etc. notify user.
An exemplary embodiment of the present invention, the sensor may also include network adapter, as shown in figure 36.As above It is sayed, the transmitter can be integrated among wearable electronic device.The network adapter from visible light signal for obtaining The equipment of breath of winning the confidence and the swapping data of other electronic equipments with network function, such as computer, or for sending instruction control Make other equipment.Optionally, the following communication technology: GPRS, GSM, CDMA, WiFi, Zigbee can be used in the network adapter, Bluetooth, RFID etc..
An exemplary embodiment of the present invention, before the transmitter sends visible light signal, the transmitter can be first First check the state of the imaging sensor from the device that visible light signal obtains information.Optionally, when described image sensor standard When standby shooting image, the screen of light-emitting component, and can be by the light that is integrated in transmitter with certain frequency shift brightness Quick device (such as sensor) detects the variation of the brightness；Then the sensor starts to send visible light signal, such as Figure 37 institute Show.Optionally, when the device for signal acquisition information is smart phone, the embedded LED flash of smart phone can be used for Signal is sent to transmitter.It optionally, can be by other sensors, such as sound transducer, gravity sensor and accelerometer Deng the state of device of the detection for obtaining information from visible light signal.It optionally, can otherwise, such as Network adaptation Device, such as GPRS, GSM, CDMA, WiFi, Zigbee, Bluetooth, RFID etc., detection are believed for obtaining from visible light signal The state of the device of breath.Optionally, the device for obtaining information from visible light signal can be the notes with light-sensitive element This computer or other electronic equipments.
An exemplary embodiment of the present invention, the transmitter are integrated among wearable electronic device.When wearable Electronic equipment starts to send visible light signal, should open its transmitter.This can be hardware based by what is installed in the transmitter Switch or other sensor-based switches being connected with transmitter are realized.Letter is opened when the wearable electronic device receives Number, just start to send optical signal.The above method is illustrated in Figure 38.
An exemplary embodiment of the present invention, the transmitter start send visible light signal after, for from The workflow that optical signal obtains the imaging sensor in the device of information is as follows, as shown in figure 39: starting receives program, initially Change imaging sensor, exposure parameter is set, sends the request for receiving visible light signal, and wait visible light signal；? After receiving visible light signal, initial code is checked, analyze captured image, measure the pattern of color fringe in image, and restore Information.
An exemplary embodiment of the present invention, the transmitter provide a kind of positioning system based on visible light signal System, as shown in figure 40.Optionally, for obtain information from visible light signal and device including imaging sensor can be including The mobile device of light-sensitive element.Optionally, the mobile device can be smart phone.Modulated light source is (e.g., in the transmitter Light source) the above-mentioned visible light signal of transmitting；Emitted visible light signal includes unique ID corresponding to light source；Figure in smart phone As the image of sensor photographic light sources, the pattern of color fringe in these images is measured, id information is decoded, and by institute Decoded ID is compared with the data being stored in map data base.By this method, it can determine and scheme from the position of light source As the accurate location of sensor.
In short, the exemplary embodiment of the present invention provides a kind of sides for effectively and being efficiently used for transmission/obtaining information Information more rapidly and is more accurately transmitted/obtained to case, and transmit/acquired information may include more data bit.It is white Optical transport only has representative " 1 " or the transmission of " 0 " or does not transmit two kinds of selections, within the unit time, is only capable of the number of 1 bit of transmission According to.Compared with white transition, an exemplary embodiment of the present invention emits two or more using the light source of multiple color The visible light signal of wavelength, can be in transmission per unit of time more multiple data bit, for example, three kinds of color RGB can transmit 24 bits Data.It further, can be in the unit time using the different frequency of visible light signal and/or out of phase and/or different amplitudes Transmit more data.
It should be appreciated that above-described embodiment is exemplary, rather than limiting the invention.Those skilled in the art can Alternative embodiment is designed, without departing from the protection scope of the appended claims.Word " comprising " is not precluded existing Element or step, although above-mentioned element or step are not listed in detail in the claims.Word before element "one" not Exclude the presence of multiple elements.In equipment claims, some elements are listed, the part of these elements can be same It is clearly embodied in one hardware product.The use of word the first, the second, third does not represent any sequence, can explain these words For title.

Claims (30)

1. a kind of method of the visible light signal transmission information using visible light source, the visible light source has to be emitted respectively Two or more light sources of the visible light signal of different colours, which comprises
Based on information to be transmitted, two or more driving signals of the light source are modulated, to obtain for driving the light Source emits two or more modulated drive signals of the visible light signal of different colours, the level of the modulated drive signal with Different phases and/or different amplitudes change between high level and low level；And
Based on the two or more modulated drive signals, emit the visible light signal, with transmission for having Rolling shutter The combination of the visible light signal by different colours that is shown from image acquired in the visible light signal of imaging sensor The pattern of different color fringe obtained, the level of the visible light signal is with different phases and/or different amplitudes Change between high level and low level, the different phase has the visible light signal in unit interval Including from bright dimmed and from one of secretly brighten two kinds variations；The different amplitude makes the visible light signal in unit Between be spaced in have multiple and different one of intensity so that each representative at least n*log of the color fringe2M Data bit, wherein n is positive integer, indicates the quantity of the light source, and m is 2 power, indicates the quantity of the different amplitude.
2. the method as described in claim 1, wherein the modulation includes:
Based on information to be transmitted, two or more driving voltages or two or more driving electricity of the light source are modulated Stream, to obtain first group of modulation driving voltage or first group of modulation driving current.
3. method according to claim 2, wherein first group of modulation driving current is respectively greater than unmodulated driving current, It is driven so that being equal to by the luminous flux of the light source of first group of modulation driving current driving by the unmodulated driving current Light source luminous flux.
4. method according to claim 2, further includes: based on have high-frequency carrier signal second group of modulation driving current, Emit the visible light signal, second group of modulation driving current is greater than unmodulated driving current, so that by described second group The light source for modulating driving current driving is being constant including the luminous flux in high level and low level each period.
5. the method as described in claim 1, wherein the pattern of different color fringes corresponds to the information including data bit, institute Stating data bit includes number, color, brightness or the data to put in order corresponding to the color fringe.
6. method as claimed in claim 5, wherein the pattern of different color fringes also corresponds to include one or more rise Beginning position and/or one or more error correction bit information, the initial position of the start bit one group of data bit for identification is described to entangle Dislocation is for checking the mistake in the data bit.
7. the method as described in claim 1, wherein the modulation includes: the phase for modulating the two or more driving signals Position and/or amplitude, to obtain two or more modulated drive signals.
8. the method as described in claim 1, wherein the pattern of different color fringes corresponds to the information including data bit, The quantity of the data bit of some time point transmission is equal to or more than the quantity of the wavelength of the visible light signal.
9. the method as described in claim 1, further include luminance level based on the color fringe during time interval and Whether the luminance level based on color fringe changes in the time interval, data value is encoded between the time of multiple color fringes Every.
10. a kind of method that the visible light signal using the different colours from light source obtains information, comprising:
The visible light signal of the different colours emitted respectively from two or more light sources obtains image, the visible light letter Number level changed between high level and low level with different phases and/or different amplitudes；
Measure the combination institute of the visible light signal by different colours shown from the described image that the visible light signal obtains The pattern of the different color fringes obtained；And
The information for corresponding to the pattern of the different color fringe is obtained,
Described image is wherein obtained by the imaging sensor with Rolling shutter, the sample frequency of the Rolling shutter is higher than described The frame rate of imaging sensor, and
Wherein, the different phase make the visible light signal in unit interval have include from it is bright dimmed and from One of two kinds of variations secretly to brighten；It is multiple that the different amplitude has the visible light signal in unit interval One of different intensity, so that each representative at least n*log of the color fringe2M data position, wherein n is just Integer indicates the quantity of the light source, and m is 2 power, indicates the quantity of the different amplitude.
11. method as claimed in claim 10, wherein obtaining image includes: to clap on the imaging sensor with Rolling shutter Described image is taken the photograph, wherein the different piece of described image sensor exposes in different time points.
12. method as claimed in claim 10, wherein the visible light signal is to be based on modulated drive signal by the light source And emit, the modulated drive signal drives the light source to emit the visible light signal, the level of the visible light signal Changed between high level and low level with different phases and/or different amplitudes.
13. method as claimed in claim 10, wherein the light source is one or more groups of light sources, and:
The visible light signal emitted from light source obtains image, the level of the visible light signal with different phase and/or It includes: the visible light letter emitted from one or more groups of light sources that different amplitudes changes between high level and low level Number obtain image, the level of the visible light signal with different phases and/or different amplitudes high level and low level it Between change, wherein one or more exposure areas in described image correspond to one or more groups of light sources；
The pattern for measuring the different color fringes from the described image that the visible light signal obtains includes: the measurement figure The pattern of the different color fringes of one or more of exposure areas as in；And
The information for obtaining the pattern corresponding to the different color fringe includes: described one for obtaining and corresponding in described image The information of the different color fringe pattern of a or multiple exposure areas.
14. method as claimed in claim 10, wherein the different color fringes in described image be from, there are different colours The combinations of two or more visible light signals with different wave length obtain, and correspond to the different color-bar The information of the pattern of line includes data bit, and the quantity for the data bit transmitted at some time point is equal to or more than visible light signal The quantity of wavelength.
15. method as claimed in claim 10, wherein the neighbouring striped in the pattern of color fringe is different colours.
16. method as claimed in claim 10 further includes the different color fringes obtained in multiple time intervals, and leads to Cross the data value that following steps obtain the single time interval from different color fringes:
Determine that each color is detected in which of three or more luminance states state during single time interval It measures；
Determine whether each color in single time interval changes luminance level.
17. a kind of visible light source for using visible light signal transmission information, the visible light source has to be emitted respectively Two or more light sources of the visible light signal of different colours, comprising:
Modulator is modulated two or more driving signals of the light source, is used for obtaining for being based on information to be transmitted Drive two or more modulated drive signals of the visible light signal of the light source transmitting different colours, the modulation driving letter Number level changed between high level and low level with different phases and/or different amplitudes；And
Transmitter emits the visible light signal of different colours, for being based on the two or more modulated drive signals to pass It is defeated for imaging sensor with Rolling shutter shown from image acquired in the visible light signal by different colours The pattern of the combination different color fringe obtained of visible light signal, the level of the visible light signal is with different phases And/or different amplitudes changes between high level and low level, the different phase makes the visible light signal in list Have in the time interval of position includes from bright dimmed and from one of secretly brighten two kinds variations；The different amplitude make it is described can Light-exposed signal has multiple and different one of intensity in unit interval, so that each generation of the color fringe Table at least n*log2M data position, wherein n is positive integer, indicates the quantity of the light source, and m is 2 power, indicates the difference Amplitude quantity.
18. light source as claimed in claim 17, wherein the modulator is used for: being based on information to be transmitted, modulate the light Two or more driving voltages or two or more driving currents in source, to obtain first group of modulation driving voltage or first Group modulation driving current.
19. light source as claimed in claim 18, wherein first group of modulation driving current is respectively greater than unmodulated driving electricity Stream is driven so that being equal to by the luminous flux of the light source of first group of modulation driving current driving by the unmodulated driving current The luminous flux of dynamic light source.
20. light source as claimed in claim 18, wherein the transmitter is used for: based on second group with high-frequency carrier signal Driving current to be modulated, the visible light signal is emitted, second group of modulation driving current is greater than unmodulated driving current, so that Light source by second group of modulation driving current driving is being permanent including the luminous flux in high level and low level each period Fixed.
21. light source as claimed in claim 17, wherein the pattern of different color fringes corresponds to the information including data bit, It includes number, color, brightness or the data to put in order corresponding to the different color fringe.
22. light source as claimed in claim 21, wherein the pattern of different color fringes also corresponds to include one or more The information of start bit and/or one or more error correction bit, the initial position of the start bit one group of data bit for identification are described Error correction bit is used to check the mistake in the data bit.
23. light source as claimed in claim 17, wherein the modulator is used for: modulating the two or more driving signals Phase and/or amplitude, to obtain two or more modulated drive signals.
24. light source as claimed in claim 17, wherein the different color fringes in described image are from different colours The combination of visible light signal obtain, and the pattern of the different color fringe corresponds to the information including data bit, The quantity for the data bit transmitted at some time point is equal to or more than the quantity of the wavelength of visible light signal.
25. a kind of device for obtaining information from the visible light signal of the different colours from light source, comprising:
Imaging sensor, the visible light signal acquisition figure of the different colours for emitting respectively from two or more light sources The level of picture, the visible light signal is changed between high level and low level with different phases and/or different amplitudes, Described in imaging sensor have Rolling shutter, and wherein the sample frequency of the Rolling shutter be higher than described image sensor Frame rate；
Memory, for storing the image of described image sensor acquisition；
Processor, for measuring the visible light signal by different colours shown in the described image of storage in the memory Combination different color fringe obtained pattern, and obtain the letter for corresponding to the pattern of the different color fringe Breath, wherein the different phase make the visible light signal in unit interval have include from it is bright dimmed and from One of two kinds of variations secretly to brighten；It is multiple that the different amplitude has the visible light signal in unit interval One of different intensity, so that each representative at least n*log of the color fringe2M data position, wherein n is just Integer indicates the quantity of the light source, and m is 2 power, indicates the quantity of the different amplitude.
26. device as claimed in claim 25, wherein described image sensor be the imaging sensor with Rolling shutter simultaneously For obtaining image from visible light signal, wherein the different piece of described image sensor exposes in different time points.
27. device as claimed in claim 25, wherein the visible light signal is to be based on modulated drive signal by the light source And emit, the modulated drive signal drives the light source to emit the visible light signal, the level of the visible light signal Changed between high level and low level with different phases and/or different amplitudes.
28. device as claimed in claim 25, wherein the light source is one or more groups of light sources, and:
The visible light signal that described image sensor is used to emit from the one or more groups of light sources obtains image, it is described can The level of light-exposed signal is changed between high level and low level with different phases and/or different amplitudes, wherein the figure One or more exposure areas as in correspond to one or more groups of light sources；
The memory is used to store the image of described image sensor acquisition；
The processor is used to measure the figure of the different color fringes of one or more of exposure areas in described image Case, and obtain the pattern of the different color fringe of the one or more of exposure areas corresponded in described image Information.
29. device as claimed in claim 25, wherein the different color fringes in described image are from different colours The combination of visible light signal obtain, and the information for corresponding to the pattern of the different color fringe includes data bit, The quantity for the data bit transmitted at some time point is equal to or more than the quantity of the wavelength of visible light signal.
30. a kind of system of the visible light signal transmission information using visible light source, the visible light source has to be sent out respectively Two or more light sources for penetrating the visible light signal of different colours, the system comprises:
Visible light source has modulator and transmission processor；And
Imaging sensor has and receives processor and memory；
Wherein the visible light source and described image sensor are configured as executing:
Based on information to be transmitted, two or more driving signals of the light source are modulated, to obtain for driving the light Source emits two or more modulated drive signals of the visible light signal of different colours, the level of the modulated drive signal with Different phases and/or different amplitudes change between high level and low level；And
Based on the two or more modulated drive signals, emit the visible light signal, with transmission for having Rolling shutter The combination of the visible light signal by different colours that is shown from image acquired in the visible light signal of imaging sensor The pattern of different color fringe obtained, the level of the visible light signal is with different phases and/or different amplitudes Change between high level and low level, the different phase has the visible light signal in unit interval Including from bright dimmed and from one of secretly brighten two kinds variations；The different amplitude makes the visible light signal in unit Between be spaced in have multiple and different one of intensity so that each representative at least n*log of the color fringe2M Data bit, wherein n is positive integer, indicates the quantity of the light source, and m is 2 power, indicates the quantity of the different amplitude.
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