JP2009130725A - Visible light communication system and optical receiving device therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To accurately transmit information by visible light, without requiring any special optical transmitting/receiving device. <P>SOLUTION: An optical transmitter DU converts additional data into data representing a flickering pattern based on an array structure of LEDs in a light emitting array 41, and emits visible light by driving the LEDs in accordance with the flickering pattern. A mobile terminal MS includes a camera 91 and a driving mechanism part 92 for varying an imaging direction of the camera. An exposure time (shutter speed) of the camera 91 is set to a value longer than a flickering interval period of the optical transmitter DU, the imaging direction of the camera 91 is then horizontally panned at a fixed angle during the flickering interval period by the driving mechanism part 92, thereby obtaining a two-dimensional light receiving image, obtained by developing on a two-dimensional plane a light receiving image of visible light emitted from the LED during the pan scanning period. The flickering pattern is then extracted from the two-dimensional light receiving image data, and the additional data are reproduced from the flickering pattern and displayed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a visible light communication system that transmits additional information related to information displayed on, for example, a signboard or poster, to a user using visible light, and an optical receiver thereof.

  For example, in shopping streets and community facilities, many signboards and posters are installed or posted for the purpose of advertising and announcements. However, signboards and posters are merely a summary of advertisements and announcements, and it is difficult to present detailed contents. Therefore, various systems have recently been proposed in which an information display device is installed near a signboard or a bulletin board and detailed information is displayed as additional information on the information display device.

For example, the additional information is converted into a two-dimensional code, the image is displayed on the information display device, the image of the displayed two-dimensional code is captured by the camera, the captured image is decoded, and the additional information is presented to the user (For example, refer to Patent Document 1).
As another proposal, the additional information is converted into a flashing pattern of light, the light source flashes according to this flashing pattern, the flashing of the light source is received by a light receiving device such as a camera, and the flashing pattern of the light source is detected from the received light signal. However, there is also one that decodes additional information (see Non-Patent Document 1).

JP-A-7-254037

Hidemitsu Sugiyama, Shinichiro Haruyama, Masao Nakagawa, “Experimental Study of Modulation Scheme Suitable for Visible Light Communication”, IEICE Technical Report vol.105, no.76, OCS2005-19, pp.43-48 , May, 2005

  However, signboards and posters are not necessarily installed at locations where the user can access, and may be installed at locations where it is difficult for the user to approach, such as roofs and rooftops of buildings. In such a case, when the two-dimensional code image disclosed in Patent Document 1 is displayed on an information display device installed near a signboard or poster, the user captures the two-dimensional code image with a camera and the captured image In order to decode the two-dimensional code with high accuracy, the two-dimensional code image needs to be enlarged and displayed in a size corresponding to the square of the distance between the information display device and the user. For this reason, a special information display device having a large screen size must be installed, resulting in an increase in system size and cost.

  On the other hand, in a system that employs the technique described in Non-Patent Document 1, in order to efficiently transmit additional information to the user in a short time, the light source blinking cycle must be set short. If the blinking cycle is shortened in this way, a special light receiving device with a short exposure time of the light receiving element is required, which increases the cost burden on the user.

  The present invention has been made paying attention to the above circumstances, and its object is to provide a visible light communication system that enables accurate information transmission by visible light without the need for a special light transmitting / receiving device, and its light To provide a receiving apparatus.

  In order to achieve the above object, a visible light communication system according to the present invention includes a light transmitting device that emits visible light from a light source and a light receiving device that receives visible light emitted from the light transmitting device. In an optical communication system, first, an optical transmission device includes a light emitting array in which a plurality of light sources are arranged in a one-dimensional direction, and information to be notified of the plurality of light sources according to the arrangement structure of the light sources in the light emitting array. Means for converting to a flashing pattern, and means for emitting visible light modulated by the information to be notified by flashing the plurality of light sources in a predetermined flashing interval period according to the converted flashing pattern. Prepare.

  On the other hand, the light receiving device is provided with a light receiving unit having a light receiving surface configured to receive a two-dimensional image and to move a light receiving position in a direction orthogonal to an arrangement direction of a plurality of light sources in the light emitting array. The light receiving unit continuously receives the visible light emitted from the plurality of light sources over the blinking interval period while moving the light receiving position, thereby receiving light from the plurality of light sources to the blinking interval period. A two-dimensional light-receiving image is obtained in which the blinking pattern of visible light emitted in the direction is developed in a direction orthogonal to the arrangement direction of the light sources. Then, the light receiving device extracts a blinking pattern of visible light emitted during the blinking interval period from the two-dimensional light reception image obtained by the light receiving unit, and uses the extracted blinking pattern as an array structure of the plurality of light sources. The information is converted into the information to be notified.

  Therefore, since the optical transmission device transmits information by blinking each of a plurality of light sources arranged one-dimensionally, the distance from the user is taken into consideration as in the case of displaying a two-dimensional code image. Therefore, it is not necessary to increase the display size of the two-dimensional code image, and thereby the image display space and the display device on the information transmission side can be reduced in size. Also, in the optical receiver, the imaging direction is scanned during the blinking interval period of visible light, so that the blinking pattern of visible light emitted from the plurality of light sources of the optical transmission device during the blinking interval period is orthogonal to the arrangement direction of the light sources. And is received as a two-dimensional received light image. For this reason, it is possible to reduce the exposure time or shutter speed of the light receiving unit compared to the case where the flashing visible light emitted from the light source is received with the light receiving position of the light receiving surface fixed. It becomes possible to use a camera.

In addition, the present invention is characterized by having the following specific configuration.
That is, the light receiving unit is provided with a light receiving sensor having a light receiving surface capable of receiving a two-dimensional image, a drive mechanism unit that changes the imaging direction of the light receiving sensor, and a scanning control unit. The scanning control means scans the imaging direction of the light receiving sensor in the angle range set in advance in the blinking interval period by driving and controlling the drive mechanism in response to the imaging operation.

  With this configuration, when the user performs an imaging operation, the imaging direction of the light receiving sensor is scanned by the set angle during the blinking interval period in response to the operation. For this reason, it is possible to automatically capture visible light of one blinking interval emitted from the light emitting device as a single two-dimensional image simply by performing an imaging operation. For this reason, the blinking pattern of visible light emitted from the light emitting device can always be accurately identified.

  In addition, the light receiving unit further includes a camera shake correction unit, and the camera shake correction unit performs a camera shake correction process on the two-dimensional light reception image received by the light receiving surface during the period of receiving the visible light emitted from the optical transmission device. Also features. With such a configuration, even when the shutter of the camera is opened for a relatively long period such as the blinking interval period, the camera shake component is corrected, and high-quality two-dimensional received image data can be obtained.

  In short, according to the present invention, it is possible to provide a visible light communication system and an optical receiver thereof that enable accurate information transmission using visible light without requiring a special optical transmitter / receiver.

Embodiments according to the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a visible light communication system according to an embodiment of the present invention. This system includes an optical transmission device used as, for example, a signboard or an advertising bulletin board, and a mobile terminal MS as an optical reception device possessed by the user.

  The optical transmission device DU includes an advertisement display area DE, and advertisement information or notification information whose display content is fixed, such as a still image, is displayed in the advertisement display area DE. The advertisement display area DE may be a general signboard or bulletin board, and an advertisement image may be directly written or a poster may be pasted thereon. A light emitting array 41 is installed at a location adjacent to the advertisement display area DE of the optical transmitter DU. The light emitting array 41 is a one-dimensional array of a plurality of light sources (e.g., six examples) 41a to 41f made of, for example, light emitting diodes (LEDs).

  FIG. 2 is a block diagram showing a circuit configuration of the optical transmitter DU. The optical transmission device DU includes a communication unit 1, a control unit 2, a storage unit 3, and a light emitting unit 4. The communication unit 1 is used to communicate with a management server (not shown) via a communication network.

  The control unit 2 includes a data reception control unit 21, a blinking pattern conversion unit 22, and a light emission control unit 23 as control functions for carrying out the present invention. Both of these control functions 21 and 223 are realized by causing an application program to be executed by a central processing unit (CPU).

  The data reception control unit 21 controls the communication unit 1 to receive display data and additional data transmitted from the management server via the communication network, and stores the received display data and additional data in the storage unit 3. . The display data is displayed as a still image in the advertisement display area DE. The additional data is for notifying the user of more detailed information not included in the display data, and is emitted from the light emitting unit 4 by visible light.

The blinking pattern conversion unit 22 reads the additional data from the storage unit 3 and first converts the additional data into a 2-bit data string represented by “0” and “1”. Next, this data string is converted into data representing the blinking pattern of the LEDs 41 a to 41 f based on information representing the arrangement structure of the LEDs 41 a to 41 f in the light emitting array 41.
The light emission control unit 23 generates light emission drive control data designating the blinking operation and the blinking cycle of the LEDs 41a to 41f based on the data representing the blink pattern converted by the blink pattern conversion unit 22, and the light emission drive control data. Is supplied to the light emitting unit 4 during one blinking interval.

  The light emitting unit 4 includes the light emitting array 41 and the light emission driving circuit 42 described above. The light emission drive circuit 42 generates light emission drive signals of the LEDs 41a to 41f according to the light emission drive control data supplied from the light emission control unit 23, and supplies these light emission drive signals to the LEDs 41a to 41f in one blinking interval period. The LEDs 41a to 41f are caused to blink.

On the other hand, the mobile terminal MS is configured as follows. FIG. 3 is a block diagram showing the circuit configuration.
That is, the mobile terminal MS includes a wireless unit 5 having an antenna 51, a control unit 6, a storage unit 7, a voice communication unit 8, a camera unit 9, a display device 10, an input device 11, and a battery. Power supply unit (not shown).

  The radio unit 5 is used for transmitting and receiving radio signals to and from a mobile communication base station (not shown). The storage unit 7 uses, for example, a NAND flash memory as a storage medium, stores phone book data, transmission / reception history, various application programs for mobile communication, and stores image data captured by the camera unit 9. Used for. The voice communication unit 8 includes a speaker 81 and a microphone 82, and is used as a receiver and a transmitter when performing voice communication.

  The display device 10 is composed of a liquid crystal display (LCD), and includes a telephone number and address of a communication partner terminal, transmitted / received mail data, pictographic data indicating the operation state of the terminal such as received electric field strength and remaining battery power, etc. It is used to display information related to normal mobile communication operations, and is also used to display imaging parameters and captured image data of the camera unit 9. The input device 11 includes a dial key and a plurality of function keys. The function keys include a key for operating the camera unit 9.

  Incidentally, the camera unit 9 includes a camera 91 that uses a CCD or a CMOS as an image sensor, and a camera drive mechanism 92 for variably controlling the imaging direction of the camera 91. Among these, the camera drive mechanism 92 includes a small motor and a transmission mechanism, and pans the imaging direction of the camera 91 at a constant speed under the control of the control unit 6.

  The control unit 6 includes a working memory such as a CPU (Central Processing Unit), a DSP (Digital Signal Processor), and a RAM (Random Access Memory). As a function for realizing the functions according to the present invention, the imaging unit 6 A control unit 61, a blinking pattern extraction unit 62, a data conversion unit 63, and a display control unit 64 are provided. All these functions are realized by causing the CPU to execute an application program.

  The imaging control unit 61 first performs an imaging operation in the input device 11 in an imaging mode for receiving visible light emitted from the LEDs 41a to 41f, that is, an additional data imaging mode. The exposure time (shutter speed) of the camera 91 is set to a value longer than the blinking interval period of the optical transmitter DU. Next, after setting the exposure time, the camera 91 is activated, and the camera driving mechanism 92 is operated to pan the imaging direction of the camera 91 in the horizontal direction by a certain angle during the blinking interval period. Then, the two-dimensional image data obtained by developing the flashing light emission of the LEDs 41a to 41f on the two-dimensional plane from the time axis captured by the camera 91 during the pan scanning period is captured.

  The blinking pattern extraction unit 62 performs image processing on the two-dimensional image data captured from the camera 91 by the imaging control unit 61 to determine, for example, the image density for each region, thereby extracting the blinking pattern. As a method of extracting the blinking pattern, the received light images when the LEDs 41a to 41f are turned on and off are stored in advance as reference images, and the image of the image based on the reference image is stored in the two-dimensional image. A method of extracting a blinking pattern by performing pattern recognition can also be used.

  The data conversion unit 63 reads the information indicating the arrangement structure of the LEDs 41a to 41f of the light emitting unit 4 stored in advance from the storage unit 7, and based on the information indicating the arrangement structure, the blinking pattern extraction unit 62 reads the information. Data representing the extracted blinking pattern is converted into a binary data string, and additional data is reproduced based on the binary data string.

  The display control unit 64 causes the display device 10 to display the two-dimensional image data imaged by the imaging control unit 61 and the additional data reproduced by the data conversion unit 63. The additional data is stored in the storage unit 7, and when a display operation is performed on the input device 11, a process of reading out from the storage unit 7 and displaying it on the display device 10 is also performed.

Next, the operation of the visible light communication system configured as described above will be described.
First, the optical transmitter DU performs the following operation. FIG. 4 is a flowchart showing the control procedure and control contents.
The control unit 2 monitors the arrival of additional data in step 4a. In this state, it is assumed that additional data related to the advertisement data displayed in the advertisement display area DE is sent from a management server (not shown). Then, the control unit 2 moves from step 4a to step 4b, receives the additional data by the data reception control unit 21, and stores the received additional data in the storage unit 3 by step 4c.

  When the process of receiving and storing the additional data is completed, the control unit 2 reads the additional data from the storage unit 3 by a predetermined number of words by the blinking pattern conversion unit 22 in step 4d. Convert to blinking pattern by processing. FIG. 6 shows an example of the conversion process.

  That is, first, the read additional data 6a (in this example, “aiueo”) is converted into a binary data string 6b represented by 2 bits of “0” and “1”. Next, information 6c indicating the array structure of the LEDs 41a to 41f of the light emitting array 41 stored in advance is read from the storage unit 3, and the binary data 6b is read from the LEDs 41a to 41f based on the information 6c indicating the array structure. The data is converted into data 6d representing the blinking pattern. For example, since the binary data 6b is 36 bits and the number of the LEDs 41a to 41f of the light emitting array 41 is 6, the binary data string 6b is divided into 6 bits, and these 6 bits are sequentially assigned to the LEDs 41a. Assign to ~ 41f.

  Subsequently, the control unit 2 proceeds to step 4e, and the light emission control unit 23 generates light emission drive control data for designating the on / off operation of the LEDs 41a to 41f and the blinking cycle according to the converted blink pattern. Drive control data is supplied to the light emitting unit 4 during the blinking interval. As a result, a light emission drive signal corresponding to the light emission drive control data is supplied from the light emission drive circuit 42 to each of the LEDs 41a to 41f, whereby the LEDs 41a to 41f blink in the blink pattern. For example, as shown in FIG. 7, each LED 41a to 41f blinks according to the blinking pattern specified by the light emission drive control data at each timing t0, t1, t2, t3, t4, and t5 in the blinking interval period.

  In addition, when the unsent word of the additional data is stored in the storage unit 3, the control unit 2 reads the unsent word a predetermined number of words after the blinking interval period and converts it into a blinking pattern. In the blinking interval period, the LEDs 41a to 41f are driven to blink according to the converted blinking pattern. Thereafter, similarly, the remaining word is converted into a blinking pattern, and the LEDs 41a to 41f are driven to blink in the next blinking interval period.

On the other hand, the mobile terminal MS performs additional data reception decoding processing as follows. FIG. 5 is a flowchart showing the control procedure and control contents.
That is, when acquiring additional data related to the advertisement information displayed in the advertisement display area DE, the user performs an additional data imaging mode setting operation on the input device 11.

  When the control unit 6 of the portable terminal MS detects the setting operation of the additional data imaging mode in step 5a, it monitors the imaging operation (shutter operation) in step 5b. Then, when the shutter is pressed, the process proceeds to step 5c, where the imaging control unit 61 sets the exposure time (shutter speed) of the camera 91 to a value longer than the blinking interval period set by the optical transmitter DU.

  Subsequently, in step 5d, the control unit 6 activates the camera 91 to start the imaging operation, and operates the camera driving mechanism 92 to change the imaging direction of the camera 91 at a predetermined angle at a constant speed during the blinking interval period. Pan horizontally for as much. As a result, the imaging direction of the camera 91 is pan-scanned at a constant speed in the horizontal direction from the left to the right with respect to the light emitting array 41 as shown in FIG. Therefore, a light reception image of visible light emitted from the LEDs 41a to 41f during the pan scanning period is formed on the light receiving surface of the camera 91 in a state of being developed on a two-dimensional plane from the time axis. Reference numeral 7a in FIG. 8 shows an example of the two-dimensional received light image. The control unit 6 captures the two-dimensional received light image data in step 5e and displays it on the display device 10.

  Next, the control unit 6 proceeds to step 5f, and the blink pattern extraction unit 62 performs image processing on the two-dimensional received light image data to determine the image density for each region, thereby extracting the blink pattern. For example, in the example of FIG. 8, the lit image portion and the unlit image portion are detected in the two-dimensional received light image data 7a, and these are replaced with binary data “1” and “0”, respectively.

Subsequently, the control unit 6 proceeds to Step 5g, and the data conversion unit 63 reads information representing the array structure of the LEDs 41a to 41f of the light emitting unit 4 from the storage unit 7, and the blinking based on the information representing this array structure. The binary data representing the blinking pattern extracted by the pattern extraction unit 62 is converted into a serial binary data string, and additional data is reproduced based on this binary data string. For example, as shown in FIG. 9, the data 9a representing the extracted blinking pattern is rearranged in order from the one corresponding to the LED 41a to convert it into a serial binary data string 9b, and this binary data string 9b is added. Data ("Aiueo") 9c is converted.
Then, the control unit 6 stores the converted additional data in the storage unit 7 in step 5h and displays it on the display device 10 in step 5i.

  Note that the imaging operation period of the camera 91 is not necessarily synchronized with the blinking interval period of the optical transmission device DU depending on the user's imaging operation timing in the mobile terminal MS. Therefore, when the additional data is reproduced from the blinking pattern on the mobile terminal MS, the control unit 6 repeats the rearrangement of binary data of the blinking pattern and the conversion process into the additional data until the correct additional data is reproduced. It is good to.

  When the additional data is transmitted over a plurality of blinking interval periods, the control unit 6 controls the light emitting array 41 of the light transmitting device DU while panning the imaging direction of the camera 92 in the horizontal direction during the plurality of blinking interval periods. The additional data is reproduced by imaging the emitted light and integrating the two-dimensional received light image data.

  As described above, in this embodiment, in the optical transmission device DU, based on the arrangement structure of the LEDs 41a to 41f in the light emitting array 41, the additional data is converted into data representing the blinking pattern, and the above-described blinking pattern is used to convert the additional data. The LEDs 41a to 41f are driven to emit visible light. On the other hand, the mobile terminal MS is provided with a camera 91 and a drive mechanism 92 for changing the imaging direction thereof. Then, after setting the exposure time (shutter speed) of the camera 91 to a value longer than the blinking interval period of the optical transmission device DU, the drive mechanism unit 92 makes the imaging direction of the camera 91 constant in the horizontal direction during the blinking interval period. By panning the angle, a two-dimensional light reception image is obtained by developing a visible light reception image emitted from the LEDs 41a to 41f on the two-dimensional plane during the pan scanning period. Subsequently, a blinking pattern is extracted from the two-dimensional received light image data, and additional data is reproduced from the extracted blinking pattern and displayed on the display device 10.

  Therefore, since the optical transmission device DU transmits information by blinking each of the plurality of LEDs 41a to 41f arranged one-dimensionally, the separation distance from the user as in the case of displaying a two-dimensional code image. In consideration of this, it is not necessary to enlarge the display size of the two-dimensional code image, and this makes it possible to reduce the image display space and the display device on the information transmission side.

  In the portable terminal MS, the visible light emitted from the LEDs 41a to 41f of the optical transmission device DU in the blinking interval period is obtained by pan-scanning the imaging direction of the camera 91 during the blinking interval period of visible light as described above. Light is received as a two-dimensional light reception image. For this reason, even if the blinking period of the visible light is short, the visible light can be received without any increase without increasing the shutter speed of the camera 91. For this reason, it is possible to use an inexpensive camera with a slow shutter speed provided in a portable terminal or the like.

  The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the LEDs 41a to 41f in the light emitting array 41 are arranged in the vertical direction and the mobile terminal MS performs pan scanning in the horizontal direction has been described as an example. However, the arrangement direction of the LEDs 41a to 41f in the light emitting array 41 may be a horizontal direction, and in this case, the mobile terminal MS may be configured to tilt scan the camera 91 in the vertical direction.

  Further, the camera unit 9 may be provided with a camera shake correction function, and the camera shake correction of the captured image may be performed by the camera shake correction function during a period in which the visible light emitted from the optical transmission device DU is received. This function is extremely effective in obtaining high-quality two-dimensional received light image data in the present invention in which the shutter is opened over the blinking interval period.

  Furthermore, although the case where a portable terminal is used as the optical receiving device has been described as an example in the embodiment, a digital camera or other electronic device including a camera may be used. In addition, the number of light sources in the light emitting array, the rules for converting additional data into a blinking pattern, the types of light sources, the configurations of the light transmitting device and the light receiving device, their control procedures, and the control contents, etc. Various modifications can be made without departing from the scope of the present invention.

  In short, the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

1 is a schematic configuration diagram of a visible light communication system according to an embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of an optical transmission device in the system illustrated in FIG. 1. It is a block diagram which shows the structure of the portable terminal used as an optical receiver in the system shown in FIG. It is a flowchart which shows the control procedure and control content by the optical transmitter shown in FIG. It is a flowchart which shows the control procedure and control content by the portable terminal shown in FIG. It is a figure which shows an example of the process which converts the display data in the optical transmission apparatus shown in FIG. 2 into a blink pattern. It is a figure which shows an example of blinking operation | movement of each light emitting element in the optical transmitter shown in FIG. It is a figure which shows an example of the blink pattern extracted from the two-dimensional image imaged in the portable terminal shown in FIG. 3, and this image. It is a figure which shows an example of the process which converts the blink pattern in the portable terminal shown in FIG. 3 into display data.

Explanation of symbols

  DU: Optical transmission device, MS: Mobile terminal, DE: Advertisement display area, 1 ... Communication interface of optical transmission device, 2 ... Control unit of optical transmission device, 3 ... Storage unit of optical transmission device, 21 ... Data reception control unit , 22 ... blinking pattern conversion unit, 23 ... light emission control unit, 4 ... light emission unit, 41 ... light emission array, 42 ... light emission drive circuit, 5 ... wireless unit of portable terminal, 51 ... antenna, 6 ... control unit of portable terminal, DESCRIPTION OF SYMBOLS 61 ... Imaging control part, 62 ... Flashing pattern extraction part, 63 ... Data conversion part, 64 ... Display control part, 7 ... Memory | storage unit of a portable terminal, 8 ... Audio | voice communication unit, 81 ... Speaker, 82 ... Microphone, 9 ... Camera Unit: 91 ... Camera, 92 ... Camera drive mechanism, 10 ... Display device, 11 ... Input device.

Claims (4)

A visible light communication system comprising: an optical transmitter that emits visible light from a light source; and an optical receiver that receives visible light emitted from the optical transmitter;
The optical transmitter is
A light emitting array in which a plurality of light sources are arranged in a one-dimensional direction;
Means for converting the information to be notified into a blinking pattern of the plurality of light sources according to the arrangement structure of the light sources in the light emitting array;
Means for emitting visible light modulated by the information to be notified by flashing each of the plurality of light sources in a predetermined flashing interval period according to the converted flashing pattern,
The optical receiver is
It has a light receiving surface configured to receive a two-dimensional image and is capable of moving a light receiving position in a direction orthogonal to an arrangement direction of a plurality of light sources in the light emitting array, and visible light emitted from the plurality of light sources, By continuously receiving light on the light receiving surface over the blinking interval period while moving the light receiving position, the blinking pattern of visible light emitted from the plurality of light sources during the blinking interval period is orthogonal to the arrangement direction of the light sources. A light receiving unit for obtaining a two-dimensional received light image developed in the direction of
Means for extracting a blinking pattern of visible light emitted during the blinking interval period from the two-dimensional received light image obtained by the light receiving unit;
A visible light communication system comprising: means for converting the extracted blinking pattern into information to be notified according to an arrangement structure of the plurality of light sources. The light source has a light emitting array in which a plurality of light sources are arranged in a one-dimensional direction, information to be notified is converted into a blinking pattern according to the arrangement structure of the plurality of light sources in the light emitting array, and the plurality of light sources are converted according to the converted blinking pattern. A light receiving device that receives visible light emitted from a light emitting device that blinks the light source in a predetermined blinking interval period,
It has a light receiving surface configured to be able to receive a two-dimensional image and to move a light receiving position in a direction orthogonal to an arrangement direction of a plurality of light sources in the light emitting array, and visible light emitted from the plurality of light sources, By continuously receiving light on the light receiving surface over the blinking interval period while moving the light receiving position, a blinking pattern of visible light emitted from the plurality of light sources during the blinking interval period is orthogonal to the arrangement direction of the light sources. A light receiving unit for obtaining a two-dimensional light reception image developed in the direction of
Means for extracting a blinking pattern of visible light emitted during the blinking interval period from the two-dimensional light-receiving image obtained by the light-receiving unit;
Means for converting the extracted blinking pattern into information to be notified according to an arrangement structure of the plurality of light sources; The light receiving unit is
A light receiving sensor having a light receiving surface capable of receiving a two-dimensional image;
A drive mechanism for changing the imaging direction of the light receiving sensor;
3. A scanning control unit that drives and controls the drive mechanism in response to an imaging operation, and scans the imaging direction of the light receiving sensor in an angle range set in advance in the blinking interval period. The optical receiver described.   The light receiving unit further includes means for performing a camera shake correction process on a two-dimensional light reception image received by a light receiving surface during a period of receiving visible light emitted from the optical transmission device. 2. The optical receiver according to 2.

Images