JP2006325166A - Information communication system, information communication equipment, information communication method and program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an information communication system, information communication equipment and an information communication method capable of calibrating characteristics of an imaging part on the transmitting side before communication even when variation by every manufacturer, for example, color expression capability of a display and an LED on the communication partner's side is not known in advance. <P>SOLUTION: In the information communication system, a transmitter displays image data for calibration on a transmitting side image display part 230 at the time of starting the communication. A receiver picks up image data for calibration and displays recognition result images on a receiving side display part 230. The transmitter picks up the recognition result images, determines a calibration factor or a function 235 for calibrating output characteristics of the transmitting side image display part 230 and calibrates the output characteristics of the transmitting side image display part 230. Next, the receiver displays the image data for calibration on the receiving side image display part 230 at the time of starting the communication. The transmitter picks up the image data for calibration, determines the calibration coefficient and the function 225 for calibrating the output characteristics of the transmitting side imaging part 220 and calibrates the output characteristics of the transmitting side imaging part 220. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information communication system, an information communication apparatus, and an information communication method, and particularly to an information communication system, an information communication apparatus, and an information communication method that use visible light as an information transmission medium.

  In recent years, camera-equipped image display devices have become widespread, such as camera-equipped mobile phones and camera-equipped personal digital assistants. A general method of using these camera-equipped image display devices is to capture and store a photograph or a moving picture of a person or a landscape with a camera, or to send / receive the captured photograph or moving picture by e-mail.

Furthermore, as in Non-Patent Document 1, a technology for performing information communication using visible light between an information terminal device installed on a street or the like and a mobile phone has been announced. According to this, it is considered that the information terminal device is operated as a transmission unit and the camera is used as a reception unit, and the mobile phone is used instead of a personal computer mouse as a main usage. According to such a communication method, the information terminal device and the camera-equipped mobile phone can be easily connected without contact.
Nikkei, March 12, 2004, 17 pages of morning edition

  However, in information terminal devices and camera-equipped mobile phones, the emission color characteristics vary depending on the display installed, and the image data displayed on the display of one device differs from that on other devices equipped with different display devices. The data may be recognized by the mobile phone with camera.

In order to perform such information communication using visible light, it is necessary to provide consistency between the output characteristics of the camera device and the display device mounted on the camera-equipped mobile phone, LCD (Liquid Crystal Display) is often used as a display device in camera-equipped image display devices, and the characteristics of polarizing filters and backlights used in LCDs vary slightly from production to production. appear.
On the other hand, CCDs (Charge Coupled Devices) and CMOSs (Complementary Metal Oxide Semiconductors) are often used for camera devices, but variations also occur in the characteristics of image sensors used in CCDs and CMOSs.

Patent Document 1 discloses an apparatus for calibrating (calibrating) an output characteristic of a color of an image captured by its own camera apparatus without requiring a reference camera in an image display apparatus with a camera.
However, this method does not take into account variations in the output characteristics of the display device. Further, in this method, calibration is performed between the output characteristics of the own display device and the output characteristics of the image captured by the own camera device. Therefore, the apparatus is insufficient for using visible light in bidirectional communication using a portable terminal.

Patent Document 2 discloses a method for displaying a color image in the original color regardless of the model of the portable terminal. According to this method, reference color image data can be obtained from a database on a network computer, and the output characteristics of the display device of the portable terminal can be calibrated.
However, this method does not take into account variations in the output characteristics of the camera device. In addition, this method requires time and labor for connecting the portable terminal to the database on the network computer. Since management is performed in units of serial numbers of mobile terminals on a database on a network computer, database management is complicated. Therefore, it is an insufficient method for using visible light in bidirectional communication using a portable terminal.

  On the other hand, in order to transmit / receive character data using visible light, it is necessary to associate character codes with color data in advance. That is, a portable terminal for performing visible light communication needs to have a function capable of encryption / decryption using color data.

Patent Document 3 discloses a method for encrypting / decrypting information by displaying colors and shades in a matrix.
However, in this method, it is necessary to print and paste an image in which colors and shades are displayed in a matrix. For this reason, it is insufficient for performing bidirectional communication using a portable terminal in real time.

Patent Document 4 discloses a method of encrypting character data into image data by associating character codes with color data.
However, this method is a method of printing image data obtained by encrypting character data and reading it with a camera of a portable terminal. Therefore, it cannot be used as it is for real-time communication.

The present invention has been made in view of the above circumstances. For example, when visible light communication is performed in a mobile terminal having an imaging unit, such as a mobile phone with a camera function, light emission of a display unit or an LED lighting color is performed. It is an object of the present invention to provide an information communication system, an information communication apparatus, an information communication method, and a program that are free from stress for a user in consideration of characteristics, camera imaging characteristics, and the like.
JP 2004-120540 A JP2002-359746 JP 2001-195536 A JP 2004-186974 A

In order to achieve the above object, an information communication system according to the first aspect of the present invention provides:
Conversion means for converting information to be transmitted into emission color data that changes in time series, and transmission means for transmitting the information by emitting light represented by the emission color data obtained by the conversion means. A transmission device, an imaging means for continuously imaging light emitted by the transmission device, and a restoration means for restoring the information based on a light emission mode of light continuously imaged by the imaging means. An information communication system configured with a receiving device,
The transmission device includes transmission control means for controlling the transmission means to transmit light of each color and information indicating each color to the reception device before transmitting the information,
The receiving device includes: an imaging control unit that controls the imaging unit so as to continuously capture the light of each color and information indicating each color; the light of each color captured by the imaging control unit and each of these colors And calibrating means for calibrating the imaging characteristics of the luminescent color imaged by the imaging means based on the information indicating the above.

An information communication system according to the second aspect of the present invention is:
An information communication system comprising a plurality of devices equipped with imaging means for imaging light and performing information communication between the devices,
Each of the devices is
Conversion means for converting information to be transmitted into emission color data that changes in time series;
Transmitting means for transmitting the information by emitting light represented by the emission color data obtained by the conversion means;
Restoring means for restoring information on the basis of the light emission mode continuously imaged by the imaging means;
Before transmitting the information, transmission control means for controlling the transmission means to transmit light of each color and information indicating each of these colors to a communication partner device;
The imaging unit is controlled so that the communication partner device that responds to the light of each color transmitted by the transmission unit and the information indicating each color transmits the light emission information indicating the result of the response to capture the light emission information. Imaging control means for
Reconstructing the light emission information imaged by this imaging means, and based on the reconstructed light emission information, calibration means for calibrating the light emission color characteristics of the transmission means,
It is provided with.

An information communication apparatus according to the third aspect of the present invention is
Conversion means for converting information to be transmitted into emission color data that changes in time series, transmission means for transmitting the information represented by the emission color data obtained by the conversion means, and light In an information communication device comprising imaging means for imaging
Before transmitting the information, transmission control means for controlling the transmission means to transmit light of each color and information indicating each of these colors to a communication partner device;
The imaging unit is controlled so that the communication partner device that responds to the light of each color transmitted by the transmission unit and the information indicating each color transmits the light emission information indicating the result of the response to capture the light emission information. Imaging control means for
Reconstructing the light emission information imaged by this imaging means, and based on the reconstructed light emission information, calibration means for calibrating the light emission color characteristics of the transmission means,
It is provided with.

An information communication method according to the fourth aspect of the present invention includes:
A conversion step for converting information to be transmitted into emission color data that changes in time series, and a first transmission for transmitting the information by emitting light represented by the emission color data obtained in the conversion step An information communication method comprising steps,
Before transmitting the information, a second transmission step of transmitting light of each color and light emission information indicating each of these colors to a communication partner;
An imaging step for imaging the light emission information when the communication partner responding to the light of each color transmitted in the second transmission step and the information indicating each color transmits the light emission information indicating the result of the response; ,
A calibration step for restoring the emission information captured in this imaging step and calibrating the characteristics of the emission color emitted in the transmission step based on the restored emission information;
It is characterized by including.

A program according to the fifth aspect of the present invention is:
A light emitting device that emits light according to the control of the computer, and the computer to which an imaging device that images light according to the control of the computer is connected;
Conversion means for converting information to be transmitted into emission color data that changes in time series;
Transmitting means for transmitting the information by emitting light represented by the emission color data obtained by the conversion means;
Before transmitting the information, transmission control means for controlling the transmission means to transmit light of each color and information indicating each of these colors to a communication partner device;
Controls the imaging device to capture the light emission information when the communication partner device responding to the light of each color transmitted by the transmission means and the information indicating each color transmits the light emission information indicating the result of the response Imaging control means for
Reconstructing the light emission information imaged by this imaging device, and based on the reconstructed light emission information, calibration means for calibrating the light emission color characteristics of the transmission means,
It is for making it function.

  According to the present invention, in an optical communication system performed between a display capable of color display or an apparatus including an issuance member such as an LED and an imaging member, the display or LED of the other party that transmits information For example, it is possible to calibrate the characteristics of the display, the LED, and the imaging member before communication without knowing in advance the variation in color expression capability for each manufacturer. An information communication method and program can be provided.

A mobile terminal according to an embodiment of the present invention will be described with reference to the drawings.
In this embodiment, a camera-equipped mobile phone 50 is used as the mobile terminal.
FIG. 1 is a front view illustrating a state in which the camera-equipped mobile phone 50 is viewed from the front with the camera-mounted mobile phone 50 open. FIG. 2A is a plan view showing the lid portion 53 of the camera-equipped mobile phone 50, and shows a state in which the lid portion 53 is viewed in a state where the camera-equipped cellular phone 50 is closed. FIG. 2B is a plan view showing the main body 51 of the camera-equipped mobile phone 50, and shows a state in which the main body 51 is viewed in a state where the camera-equipped mobile phone 50 is closed.

  As shown in the figure, the camera-equipped mobile phone 50 includes a main body 51, a hinge 52, and a lid 53. The main body 51 and the lid 53 are connected by a hinge 52. Inside the hinge part 52, a fixed shaft (not shown in the figure) fixed to the main body part 51 is provided. The lid 53 rotates with respect to the main body 51 around the fixed axis, and the lid 53 and the main body 51 can be opened and closed.

  A speaker 122 and a main image display device 125 are disposed in front of the lid portion 53. The speaker 122 outputs sound or the like based on the communication sound signal received by the camera-equipped mobile phone 50. The main image display device 125 includes a low power consumption display device such as an LCD, and displays various messages, various menu lists, and the like.

  The main body 51 is provided with a microphone 123, a numeric keypad 127, a power key 128, a cross key 129, an enter key 130, a clear key 131, and a transmission key 132. The lid 53 is provided with an imaging device 124 and a sub image display device 126. Details will be described below.

The cross key 129 is an operation key for moving the cursor displayed on the main image display device 125 or moving the focus at the time of shooting by the camera. On the screen that allows input of characters and the like, a cursor for performing an input operation is displayed on the main image display device 125, and this cursor can be moved by operating the cross key 129.
In addition, when shooting with a camera, so-called zoom shooting can be performed by operating the cross key 129. That is, by operating the cross key 129, the aim of the imaging device 124 can be moved to change the shooting magnification for the shooting target. This change in the shooting magnification is performed by the user operating the cross key 129 to move the aim of the imaging device 124 while confirming the shooting target with the main image display device 125, and positioning the imaging device 124 so that the desired magnification is obtained. By doing.

The enter key 130 is an operation key for performing input for determining the selected content. For example, by operating the determination key 130, it is possible to determine the input of the character selected by operating the cursor from the characters displayed on the main image display device 125.
Further, the enter key 130 functions as a shutter key of the camera at the time of camera shooting. In other words, by operating the enter key 130 on the shooting screen, the image displayed on the main image display device 125 can be captured as a shot image.

  The clear key 131 is an operation key for canceling instructions, and is an operation key for canceling the operation content input by operating other operation keys. If it is before it determines with the determination key 130 about the operation content input with operation keys other than the clear key 131, it can cancel by operation of the clear key 131. FIG.

  The transmission key 132 is an operation key for setting a state in which a call can be made to another telephone. After enabling the transmission by operating the transmission key 132, the telephone number of the transmission destination (the other party to call) can be input.

  The power key 128 serves as an operation key for turning on / off the power and a call off key for ending the call. When the power key 128 is pressed during a call, the cellular phone 50 ends the communication operation with the other party's phone. Further, when the power key 128 is pressed and held, the power is turned on when the power is turned off, or the power is turned off when the power is turned on.

  On the numeric keypad 127, there are arranged a numeric key representing a single digit number from 0 to 9, a key representing +, −, ×, ÷ symbols representing four arithmetic operations, a symbol representing #, *, and the like. By operating the numeric keys, the telephone number of the other party who wants to talk can be input. Also, a corresponding character is assigned to each key, and by pressing each key the corresponding number of times, an arbitrary character can be input, for example, a mail document can be created.

  The microphone 123 receives a user's uttered sound, converts it into an audio signal, and outputs it.

  The imaging device 124 includes a lens that forms an image to be captured on an imaging sensor of an imaging unit provided in the mobile phone 50.

  The sub image display device 126 is configured by a low power consumption type display device such as an LCD, and displays various messages. Unlike the main image display device 125, the user can know the status of incoming calls and mails even when the lid 53 is closed.

Next, the signal processing circuit of the mobile phone 50 will be described.
As shown in FIG. 3, the camera-equipped mobile phone 50 includes a CPU (Central Processing Unit) 210, a data reception unit 224, and a data transmission unit 234. In addition, the camera-equipped mobile phone 50 includes a ROM (Read Only Memory) 290, a RAM (Random Access Memory) 291, an I / O interface 292, a battery 293, an external recording device 294, a communication control unit 295, an audio output unit 296, A voice input unit 297 and an operation input unit 298 are provided. Details will be described below.

  The data receiving unit 224 performs image capturing and calibration. A data receiving unit 224, an imaging unit 220, an imaging module 221, an imaging calibration unit 222, and an imaging conversion unit 223 are included.

  The imaging module 221 performs control for obtaining image data to be imaged. The imaging module 221 includes an imaging sensor for obtaining image data. A two-dimensional image to be imaged is captured through the imaging device 124 on the sensor surface of the imaging sensor. The imaging sensor captures a two-dimensional image captured on the sensor surface and obtains the image data. For example, a two-dimensional CCD sensor or CMOS sensor can be used as an imaging sensor incorporated in the imaging module 221.

Image data obtained by the imaging sensor is input to the imaging conversion unit 223. The imaging conversion unit 223 converts captured image data into digital data. The imaging conversion unit 223 performs image encryption / decryption processing and compression / decompression processing based on, for example, the MPEG / JPEG standard. The converted image data is stored in the RAM 291.
Furthermore, the imaging conversion unit 223 has a function of decoding received data when performing visible light communication using the mobile phone 50. For example, the present embodiment has a function of converting data encrypted into an image with a time-series color change into original data.

  The image data converted by the imaging conversion unit 223 is input to the imaging calibration unit 222. The imaging calibration unit 222 performs flare correction and gamma correction on the image data, and adjusts the color gradation of the captured image. In addition, the imaging calibration unit 222 performs image color adjustment according to the output characteristics of each imaging sensor in accordance with an instruction from the imaging module 221. For example, when the digitized image information is expressed by three primary colors R, G, and B, and the luminance of R is larger than the original color, the imaging calibration unit 222 reduces the luminance of R of the captured image data. Make adjustments. The magnitude of the adjustment value to be performed at this time is determined according to the calibration coefficient or function 225 of the imaging unit 220 stored in the RAM 291. The calibration coefficient or function 225 will be described later. The image data adjusted in this way is stored in the RAM 291.

  The data transmission unit 234 performs image display and calibration. The data transmission unit 234 includes an image display unit 230, an image display module 231, an image display calibration unit 232, and an image display conversion unit 233. Further, the image display unit 230 includes a main image display device 125 and a sub image display device 126.

  The image display module 231 performs control for displaying an image based on image data or character data on the main image display device 125 and the sub image display device 126. For example, an LCD can be used as the main image display device 125 and the sub image display device 126. The image display module 231 can simultaneously output different images to the main image display device 125 and the sub image display device 126.

Image data to be displayed on the main image display device 125 or the sub image display device 126 is input to the image display module 231 by the CPU 210. Further, the image data to be displayed is input to the image display conversion unit 233. The image display conversion unit 233 decodes the input image data for reproduction and stores it in the RAM 291.
Further, the image display conversion unit 233 has a function of encrypting transmission data when performing visible light communication using the mobile phone 50. For example, the present embodiment has a function of converting arbitrary character data into image data with time-sequential color change.

  The image data converted by the image display conversion unit 233 is input to the image display calibration unit 232. The image display calibration unit 232 performs gamma correction on the image data. In response to an instruction from the image display module 231, the image display calibration unit 232 adjusts the color to be displayed according to the output characteristics of each image display device. For example, when the digitized image data is expressed in three primary colors of R, G, and B, and the display characteristic of the main image display device 125 has a luminance of R smaller than the original color, the image display calibration unit 232 displays. Adjustment to increase the luminance of R of the image data is performed. The magnitude of the adjustment value performed at this time is determined according to the calibration coefficient or function 235 stored in the RAM 291. The calibration coefficient or function 235 of the image display unit 230 will be described later. The image data calibrated in this way is displayed on the main image display device 125 or the sub image display device 126.

  The ROM 290 stores an operating system and programs necessary for overall control of the mobile phone 50.

  The CPU 210 controls the entire mobile phone 50 in accordance with a control program stored in the ROM 290. CPU210 transmits a control signal and data to each part, or receives a response signal and data from each part as needed for control.

  The I / O interface 292 performs data input / output with an external device. For example, the mobile phone 50 and the personal computer are connected by USB (Universal Serial Bus) connection.

  The battery 293 is a power source for driving the mobile phone 50.

  The external recording device 294 is connected to an external recording medium such as a miniSD (registered trademark) card and inputs / outputs data.

The RAM 291 stores an address book used for telephone calls and mails, a call history, setting values for various functions, and the like. Further, the image data captured and digitized by the imaging unit 220, the image data adjusted by the imaging calibration unit 222, and the image data decoded by the imaging conversion unit 223 are stored. Further, the image data displayed by the image display unit 230, the image data adjusted by the image display calibration unit 232, and the image data encrypted by the image display conversion unit 233 are stored.
The RAM 291 stores the calibration coefficient or function 225 of the imaging unit 220 and the calibration coefficient or function 235 of the image display unit 230 necessary for visible light communication according to the present invention.
The RAM 291 stores a character code / lighting pattern correspondence table 255 and a character code / color data correspondence table 245 necessary for visible light communication according to the present invention.

  The communication control unit 295 modulates the signal input by the voice input unit 297 when the mobile phone 50 is a transmitter. Further, when the mobile phone 50 becomes a receiver, the input signal is demodulated.

  The audio output unit 296 outputs the demodulated call sound to the speaker 122 when the mobile phone 50 is a transmitter.

  The voice input unit 297 collects a user's voice and the like by the microphone 123 and converts it into a voice signal.

  The operation input unit 298 receives operation signals of operation keys such as a numeric keypad 127, a power key 128, a cross key 129, an enter key 130, a clear key 131, and a transmission key 132. The operation input unit 298 outputs a key code signal corresponding to the operation signal to the CPU 210. The CPU 210 determines the operation content based on the key code signal.

Next, an outline of a visible light communication method using the mobile phone 50 will be described.
FIG. 4 is a conceptual diagram when the same camera-equipped mobile phone is used for both the transmission device 410 and the reception device 420. In this case, imaging devices for data reception necessary for visible light communication are the cameras 413 and 423. The image display devices for data transmission are sub-displays 412 and 422. In addition, main displays 411 and 421 are used as operation guidance displays.

When performing visible light communication, the transmission-side user always images the sub-display 422 of the reception device 420 with the camera 413 as indicated by an arrow 415. In addition, the transmission-side user always keeps the sub display 412 facing the reception device 420 as indicated by an arrow 416.
Similarly, the receiving user always captures an image of the sub display 412 of the transmission apparatus 410 with the camera 423 as indicated by an arrow 425. Also, the receiving user always keeps the sub-display 422 facing the transmission device 410 as indicated by an arrow 426.

In FIG. 4, for convenience, (a) is the transmitting side and (b) is the receiving side, but conversely, (b) can be used for the transmitting side and (a) can be used for the receiving side.
In this manner, visible light communication can be performed by performing data transmission by display on the display facing the communication partner and receiving data by imaging with a camera.
The design of the mobile phone 50 can be arbitrarily changed. For example, in the present embodiment, two main displays and sub-displays are used. However, the main display may be rotated to face the communication partner, and one display may be used.

Next, the flow of visible light communication by the mobile phone 50 will be described with reference to both FIG. 5 and FIG.
FIG. 5 is a flowchart illustrating the flow of visible light communication separately for the transmission side and the reception side. FIG. 6 is a flowchart for explaining the operation when starting visible light communication.

  First, the transmission device 410 makes adjustments to the reception device 420, for example, requests the start of visible light communication (step S511), and waits for a communication permission signal from the reception device 420 (step S512). On the other hand, the receiving device 420 waits for a communication start request from the transmitting device 410 (step S521). This communication start request is made by a binary signal based on ON / OFF of light. For example, communication is performed using two values of whether a part or all of the transmission side sub-display 412 is turned on in white or turned off (hereinafter referred to as binary communication).

  The lighting pattern indicating the communication start request is a common lighting pattern when performing visible light communication in the present embodiment, and is determined in advance. For example, FIG. 6A is an example of a lighting pattern representing a communication start request. This signal is expressed in time series of one display unit representing, for example, white lighting (1) or extinguishing (0). In the case of FIG. 6A, 8 display units of “10101010” and 8 display units of “00000000” are continuously expressed.

FIG. 6D schematically illustrates the operations of the transmission device 410 and the reception device 420 when a communication start request is made.
First, as illustrated in (d-1), the transmission device 410 displays a lighting pattern indicating a communication start request on the sub-display 412 (step S521).
Next, as illustrated in (d-2), the reception device 420 captures the lighting pattern with the camera 423 and recognizes the communication start request. Next, as shown in (d-2), it is determined whether or not communication is permitted (step S522). When the communication is permitted (Yes in step S522), the receiving device 420 displays a lighting pattern indicating communication permission on the sub-display 422 as shown in (d-3). On the other hand, if the receiving device 420 does not permit communication (No in step S522), the receiving device 420 ends the visible light communication.
On the other hand, the transmission device 410 stands by while capturing the lighting pattern with the camera 413 (step S512). The transmission device 410 always determines the input, and starts visible light communication when it is recognized as permitted (Yes in step S513).
Here, the communication permission signal is also expressed in a time-series sequence of one display unit indicating lighting (1) or light extinction (0). The lighting pattern of the communication permission signal is different from the lighting pattern of the communication start request signal.

When performing binary communication using the lighting pattern as shown in FIG. 6A, the light emission time of one display unit is lengthened or shortened depending on the performance of the display device and the camera device of the transmission device 410 and the reception device 420. There is a need to. This corresponds to determining a communication rate that matches the performance of the transmission device 410 and the performance of the reception device 420.
FIG. 6B is an example of a result of adjusting the communication rate. In this adjustment, only the light emission time per display unit of the light to be turned on by the transmission device 410 is lengthened. Thus, the lighting pattern itself does not change by adjusting the communication rate.

In the present embodiment, a plurality of types of time-sequential continuous patterns of one display unit representing lighting (1) or extinguishing (0) are defined.
For example, the character code / lighting pattern correspondence table 255 is defined as shown in FIG. In this case, 252 theoretical definitions (excluding communication start request signals, communication permission signals, all 1s, all 0s) are possible. In practice, in order to improve communication accuracy, the number of usable patterns may be less than half due to reasons such as not using a similar pattern. However, it is sufficient for expressing several symbols such as 10 numbers, 26 alphabets, #, *, and the like.

  If these expressions are used, the minimum communication for calibrating the image display unit 230 and the imaging unit 220 becomes possible. For example, the color to be adjusted can be expressed by (R, G, B), and information such as what color to adjust can be transmitted and received in advance.

In addition, for example, by transmitting / receiving the serial number of the transmission device 410 when a communication start request is made, the reception device 420 refers to the calibration coefficient stored in the RAM 291 or the functions 225, 235, etc. You may make it authenticate.
In this binary communication, eight display units or more may be used for one lighting pattern.

Next, when the start of communication is permitted by the receiving apparatus 420 (Yes in step S513), the process after the transmission apparatus 410 identifies this will be described.
First, the transmission device 410 requests the reception device 420 to start calibration of the transmission-side image display unit 230. Thereafter, the image display calibration unit 232 performs calibration of the transmission-side image display unit 230 in cooperation with the transmission device 410 and the reception device 420 (steps S514 and S524). In the present embodiment, calibration of the sub display 412 of the transmission device 410 is performed. Thereby, the output characteristic of the sub display 412 of the transmission apparatus 410 is calibrated so as to match the output characteristic of the camera 423 of the reception apparatus 420. Details of calibration of the transmission-side image display unit 230 will be described later.

  Next, the transmission device 410 requests the reception device 420 to start calibration of the transmission-side imaging unit 220. The imaging calibration unit 222 calibrates the transmission side imaging unit 220 (step S515, step S525). In the present embodiment, the transmission side camera 413 is calibrated. As a result, the output characteristics of the camera 413 of the transmission apparatus 410 are calibrated to match the output characteristics of the sub display 422 of the reception apparatus 420. Details of calibration of the transmission side imaging unit 220 will be described later. When the calibration of the imaging unit 220 ends, the reception device 420 waits for a transmission message to be transmitted from the transmission device 410 (step S526).

  Here, the details of calibration will be described. When the image display unit 230 and the imaging unit 220 are calibrated, the transmission device 410 and the reception device 420 can identify various colors based on stable output characteristics of the image display unit 230 and the imaging unit 220. It becomes. In other words, highly accurate visible light communication is possible due to the high color resolution between the transmission device 410 and the reception device 420. Therefore, data can be encrypted / decrypted using various colors. In this embodiment, the image display conversion unit 233 performs data encryption, and the imaging conversion unit 223 performs data decryption.

  Returning to the flowchart of FIG. 5B, after the calibration of the image display unit 230 and the imaging unit 220 is completed, the user on the transmission side edits an arbitrary message according to the procedure displayed on the main display 411 (step S516). ). The image display conversion unit 233 encrypts the transmission message after the user finishes editing the transmission message (step S517). Through the encryption, the transmission message is converted into a signal using a color that can be recognized by the transmission device 410 and the reception device 420.

  The encryption here will be described in detail. For example, in this embodiment, three primary colors of red (R), green (G), and blue (B) are distinguished by 256 gradations (0 to 255). A plurality of types of colors defined by combinations of R, G, and B gradations are used as recognizable colors.

  For example, in this embodiment, eight colors of red (R), green (G), blue (B), orange (O), yellow (Y), yellow-green (M), purple (P), and white (W) Is used. Further, the color to be used is associated with the character code. For example, the character code “A” is (R, G, B) = (255, 0, 0), and the character code “B” is (R, G, B) = (255, 255, 0). Associate with. FIG. 7A shows an example of the character code / color data correspondence table 245.

  Further, the color gradation representing one character code is given a width (color region). For example, gradations 0 to 15 are 0, gradations 16 to 47 are 32, gradations 48 to 79 are 64, gradations 80 to 111 are 96, gradations 112 to 143 are 128, gradation 144 ˜175 are associated with 160, gradations 176 to 207 with 192, gradations 208 to 231 with 224, and gradations 232 to 255 with 255. FIG. 7B is a correspondence table in which the width of the color area is added to the correspondence table of FIG. As a result, decoding can be performed even when a reading error occurs in the color read by the imaging apparatus.

  As another method, for example, gradations 0 to 15 are 0, gradations 48 to 79 are 64, gradations 112 to 143 are 128, gradations 176 to 207 are 192, and gradations 232 to 255 are 255. Corresponding to, gradations 16 to 47, gradations 80 to 111, gradations 144 to 175, gradations 208 to 231 in the middle are made unused. As described above, a corresponding area and a non-corresponding area may be provided, and if the read color is a non-corresponding area, re-reading may be performed as a reading error. Thereby, the precision of decoding can be improved.

  As another method, it is possible to associate a character code with a plurality of color data. FIG. 7C shows an example in which character codes are associated with combinations of different three colors. As a result, it is possible to associate many character codes with color data using a small number of color combinations.

By using such a character code / color data correspondence table 245, the transmitted message can be encrypted / decrypted using visible light.
For example, when FIG. 7C is used as the character data / color data correspondence table 245, the message “B1 #” can be encrypted as “RWOBYROPG”.

  For example, black (K) may be used as a delimiter, and encryption may be performed like “RWO (K) BYR (K) OPG”.

  The above is the detailed description of encryption.

  Here, returning to the flowchart of FIG. 6B, the transmission message encrypted by the above-described method is displayed on the sub-display 412 of the transmission apparatus 410 as continuous color data in time series (step S518). ). Thereafter, if there is a next transmission message (Yes in step S519), the process returns to step S516 and the same processing is executed. The receiving device 420 receives the message by imaging the time-series continuous color data (step S527). The received message is decoded in accordance with the character code / color data correspondence table 245 stored in the RAM 291 by the imaging conversion unit 233 of the receiving device 420 (step S528). The decrypted message is displayed on the main display 422 of the receiving device 420 (step S529). Thereafter, if there is a received message (Yes in step S530), the process returns to step S526 and the same processing is executed.

  As described above, the transmission device 410 can encrypt arbitrary character data into color data using visible light and transmit the encrypted data to the reception device 420. The receiving device 420 can receive the color data by decoding the original color data. That is, the transmission side user can transmit arbitrary character data, and the reception side user can read the received message.

Next, details of calibration of the transmission-side image display unit 230 will be described.
FIG. 8 is a flowchart of the operation on the transmission device 410 side when the image display unit 230 is calibrated. FIG. 9 is a flowchart of the operation on the receiving apparatus 420 side when the image display unit 230 is calibrated. FIG. 10 shows the operations of the transmission device 410 and the reception device 420 schematically.

  First, when calibration of the image display unit 230 is started, the transmission apparatus 410 displays a calibration start request signal 850 on the sub-display 412 (step S811). As described above, the calibration start request signal 850 is a signal using binary values of lighting or extinguishing. The transmission device 410 waits for a calibration start permission signal 860 from the reception device 420 (step S812).

  On the other hand, the receiving apparatus 420 first designates 1 as an initial value for designating red in order to determine the color (step S921). Next, it waits for the calibration start request signal 850 to be displayed on the display 412 of the transmission apparatus 410 (step S911). When receiving the calibration start request signal 850, the reception device 420 displays the calibration start permission signal 860 when the calibration is permitted (Yes in step S912). On the other hand, if not permitted (No in step S912), the calibration is terminated.

  Next, when the start of calibration is permitted (Yes in step S813), the transmission device 410 displays a calibration start signal 870 (step S814). Further, the calibration operation is started (step S815). When receiving the calibration start signal 870 (Yes in step S912), the receiving device 420 enters the calibration operation of the transmission-side image display unit 230 (step S916).

  Calibration of the image display unit 230 is performed for a predetermined color. For example, in this embodiment, it is performed using three colors of red (R), green (G), and blue (B).

  Next, the transmission apparatus 410 transmits, for example, information that is specified by i = 1 and the color to be adjusted first is red (R) to the reception apparatus 420 by binary communication by turning on / off (step S822). ). At this time, for example, transmission is performed using a predetermined character code / lighting pattern correspondence table 255 as shown in FIG. Further, the transmission device 410 displays red for adjustment on the sub-display 412 (step S823). The transmission device 410 waits for the recognition result signal 890 from the reception device 420 (step S824).

On the other hand, the receiving device 420 images the sub display 412 of the transmitting device 410 and recognizes that the color to be adjusted is red (R) by binary communication by turning on / off (step S922). Further, the reception device 420 images the sub display 412 of the transmission device 410, and captures a red image that is an adjustment target color (step S923).
The receiving device 420 displays the recognition result signal 890 of the captured image on the sub display 422 (step S925). For example, when the color imaged by the camera 423 of the receiving device 420 is (R, G, B) = (240, 10, 10), this information is transmitted to the transmitting device 410 by binary communication by turning on / off. To do.

The image display calibration unit 232 of the transmission device 410 compares the color data of the information 880 relating to the color to be adjusted by itself with the color data of the recognition result signal 890 by the reception device 420 (step S826).
Similarly, the other adjustment target colors are also compared. For example, in this embodiment, in addition to red (R), green (G) and blue (B) are also compared (steps S829 and S830).

  When the image display proofreading unit 232 determines that there is a difference between the color data of the information 880 relating to the color to be adjusted by itself and the color data of the recognition result signal 890 by the receiving side 420 (Yes in Step 827), Calibration is performed so that the output characteristic of the image display unit 230 matches the color data of the recognition result signal 890 by the receiving side 420 (step S828).

  For example, it is assumed that the color data of the information 880 relating to the color to be adjusted by itself transmitted in step S822 is (R, G, B) = (255, 0, 0). Further, it is assumed that the color data captured by the receiving side 420 is (R, G, B) = (240, 10, 10). In this case, the image display calibration unit 232 calibrates the image display unit 230 so that R is increased by 15 gradations and G and B are decreased by 10 gradations.

As described above, the image display unit 230 obtains the calibration coefficient or function 235 for matching the output characteristics of the image display unit 230 on the transmission side 410 and the imaging unit 220 of the reception device 420. The calibration coefficient or function 235 is stored in the RAM 291.
Therefore, once calibration is performed, calibration with the receiving apparatus 420 from the second time can be omitted. Furthermore, by storing the calibration coefficient or function 235, the displayed image can always be kept at the same image quality. Also, the calibration factor or function 235 can be modified at any time.

  For example, a calibration coefficient or a correction history of the function 235 may be stored so that the user can appropriately select from a plurality of stored setting values.

  For example, a future calibration coefficient or function 235 may be estimated from the correction history of the calibration coefficient or function 235, and calibration may be automatically performed.

  In this way, by performing calibration of the image display unit 230, the output characteristics of the image display unit 230 of the transmission device 410 and the imaging unit 220 of the reception side 420 can be matched. Thereby, visible light communication with high accuracy becomes possible.

Next, details of calibration of the transmission side imaging unit 220 will be described.
FIG. 11 is an operation flowchart on the transmission apparatus 410 side when the imaging unit 220 is calibrated. FIG. 12 is an operation flowchart on the receiving device 420 side when the imaging unit 230 is calibrated. FIG. 13 schematically illustrates the operations of the transmission device 410 and the reception device 420.

  First, when calibration of the imaging unit 220 is started, the transmission device 410 displays a calibration start request signal 1150 on the sub-display 412 (step S1111). This calibration start request signal 1150 is a signal using binary values of lighting or extinguishing. The transmission device 410 waits for a calibration start permission signal 1160 from the reception device 420 (step S1112).

  On the other hand, the receiving apparatus 420 waits for the calibration start request signal 1150 to be displayed on the display 412 of the transmitting apparatus 410 (step S1211). Receiving the calibration start request signal 1150, the receiving device 420 displays the calibration start permission signal 1160 when the calibration is permitted (step S1213). If not permitted (No in step S1212), the calibration is terminated.

Next, when the start of calibration is permitted (Yes in step S1113), the transmission side 410 displays a calibration start signal 1170 (step S1114). Further, the calibration operation is started (step S1115).
On the other hand, when the reception side 420 recognizes the calibration start signal 1170 (Yes in step S1215), the reception side 420 enters the calibration operation of the transmission side imaging unit 220 (step S1216).

  Here, the calibration of the imaging unit 220 is performed on a predetermined color as in the case of the calibration of the image display unit 230. For example, in the present embodiment, the process is performed for three colors of red (R), green (G), and blue (B).

  Next, for example, the reception device 420 transmits that the color to be adjusted first is red (R) to the transmission device 410 by binary communication by turning on / off (step S1222). At this time, for example, transmission is performed using a predetermined character code / lighting pattern correspondence table 255 as shown in FIG. Further, the receiving device 420 displays red for adjustment on the sub-display 422 (step S1223). Thereafter, the receiving apparatus 420 waits for a signal 1190 indicating that the adjustment to display red is finished from the transmitting apparatus 410 (step S1224).

  On the other hand, the transmission side 410 images the sub-display 422 of the reception device 420 and receives that the color to be adjusted is red (R) by binary communication by turning on / off (step S1122). Further, the transmission device 410 captures the sub display 422 of the reception device 420 and captures a red image that is an adjustment target color (step S1123).

Next, the imaging calibration unit 222 of the transmission apparatus 410 compares the color data of the information 1180 relating to the color to be adjusted received from the reception apparatus 420 by binary communication with the color data of the image captured by the camera 413 itself. (Step S1125).
Similarly, the other adjustment target colors are also compared. For example, in the present embodiment, similarly to red (R), comparison is performed for green (G) and blue (B) (steps S1129 and S1130).

  On the other hand, when the imaging calibration unit 222 determines that there is a difference between the color data of the information 1180 related to the color to be adjusted received from the receiving device 420 and the color data of the image captured by the camera 413 (step S1126). In the case of “Yes”, the imaging calibration unit 222 performs calibration so that the output characteristics of the imaging unit 220 are matched with the color data of the information 1180 regarding the color to be adjusted by the receiving device 420 (step S1127).

  For example, it is assumed that the color data of the information 1180 relating to the color to be adjusted received in step S1122 is (R, G, B) = (255, 0, 0). Further, it is assumed that the color data captured by the camera 413 is (R, G, B) = (240, 10, 10). In this case, the imaging calibration unit 222 calibrates the imaging unit 220 so that R is increased by 15 gradations and G and B are decreased by 10 gradations.

As described above, the imaging unit 220 obtains the calibration coefficient or function 225 for matching the output characteristics of the imaging unit 220 of the transmission device 410 and the image display unit 230 of the reception device 420. The calibration coefficient or function 225 is stored in the RAM 291.
Therefore, once calibration is performed, calibration with the receiving apparatus can be omitted from the second time. Further, by storing the calibration coefficient or function 225, the displayed image can always be kept at the same image quality. Also, the calibration factor or function 225 can be modified at any time.

  For example, a calibration coefficient or a correction history of the function 225 may be stored so that the user can appropriately select from a plurality of stored setting values.

  For example, a future calibration coefficient or function 225 may be estimated from the correction history of the calibration coefficient or function 225, and the calibration may be automatically performed.

  In this way, by performing calibration of the imaging unit 220, output characteristics of the imaging unit 220 of the transmission device 410 and the image display unit 230 of the reception device 420 can be matched. Thereby, visible light communication with high accuracy becomes possible.

  It should be noted that the calibration coefficient or function 225 of the imaging unit 220 and the calibration coefficient or function 235 of the image display unit 230 are not set independently, but are preferably set in association with each other. .

Next, an operation screen for performing visible light communication will be described.
FIG. 14 is an example of a screen for performing calibration when starting visible light communication. This screen is displayed on the main display 411.

  First, when an application stored in the ROM 290 for performing visible light communication is activated, a menu for performing communication with the receiving device 420 is displayed as shown in FIG. When the user selects to connect to the receiving device 420 in this menu, the main display 411 shifts to a screen for imaging the receiving device 420 as shown in FIG.

  Next, in the visible light communication application, as illustrated in FIG. 14C, the imaging position of the sub display 422 and the camera 423 of the receiving device 420 is set to a position where visible light communication with the receiving device 420 is possible. Encourage aiming. The transmission-side user adjusts the orientation of the sub-display 412 and the camera 413 of the transmission device 410 in order to aim.

  For example, the aiming line displayed in the main display 411 may be moved instead of changing the orientation of the transmission device 410 in order for the transmission-side user to aim.

  When the transmission-side user aims, the calibration of the image display unit 230 and the imaging unit 220 of the transmission device 410 is started as shown in FIG. Communication performed at this time is binary communication by turning on or off. When the calibration is normally completed, the transmission device 410 enters a message transmission / reception standby state as shown in FIG. If calibration ends abnormally, an error screen is displayed as shown in FIG. In this case, it is necessary to re-execute calibration.

  FIG. 15 is an example of a screen for transmitting a message to the receiving device 420. The transmission-side user activates the submenu as shown in FIG. 15A in the standby state of FIG. Further, when selecting to create a message, the screen moves to a message creation screen as shown in FIG. The transmission-side user transmits a message to the reception device 420 after creating the message. Communication performed at this time is visible light communication.

  Although the embodiment of the present invention has been described above, the visible light communication method according to the present invention can be realized by using a normal mobile terminal with a camera, without using a dedicated system.

For example, in the present embodiment, the main display and the sub display of the mobile phone 50 are used, but it is also possible to use a single display by rotating the main display to face the communication partner side. Good.
Further, a digital camera, a PDA (Personal Digital Assistance), or the like may be used instead of the mobile phone.

  For example, in the present embodiment, only eight colors are used as visible light used for visible light communication, but eight or more colors may be used. Thereby, the transfer rate in data transmission / reception can be improved.

  For example, in the present embodiment, calibration is always performed at the start of visible light communication, but when transmitting and receiving unique information such as the serial number of the communication partner together with visible light communication with the authenticated communication partner Calibration may be omitted.

It is also possible to improve the usage of the sub-display for data transmission.
For example, in the character code / color data correspondence table 245 in FIG. 7C, one character code is associated with one of the combinations of three colors that are continuous in time series. The region may be divided into three or more and three or more colors may be displayed simultaneously. Thereby, the communication rate of visible light communication can be increased, and more character codes can be used.

  For example, in this embodiment, the character code / color data correspondence table 245 and the character code / lighting pattern correspondence table 255 are common to all terminals, but may be updated by downloading from a server on the network. Further, the character code / color data correspondence table 245 and the character code / lighting pattern correspondence table 255 may be selectable depending on the communication partner. Thereby, security in visible light communication can be enhanced.

  For example, in the present embodiment, the visible light communication according to the present invention is used for message transmission / reception. However, the quality of the display device and the imaging device is stabilized in the manufacturing / shipping stage of a mobile phone, a digital camera, a PDA, etc. It may be used for calibration aimed at.

It is a figure which shows the external appearance of the front part of the mobile telephone which concerns on one Embodiment of this invention. It is a top view which shows the back side of the state which closed the mobile telephone. It is a block diagram which concerns on the signal processing of the portable terminal with a camera. It is a figure which shows one Embodiment of this invention notionally. It is a flowchart explaining operation | movement of the data transmission side and data reception side in the case of performing visible light communication. It is a figure explaining the operation | movement in the case of starting visible light communication. (A), (b) is an example of binary communication. (C) is an example of a character code / lighting pattern correspondence table for binary communication. (D) is a figure which shows notionally the operation | movement at the time of visible light communication start. It is an example of a character code / color data correspondence table used when performing visible light communication. It is a flowchart explaining operation | movement by the side of a transmission apparatus among operation | movement in the case of calibrating (calibration) of an image display part. It is a flowchart explaining the operation | movement by the side of a receiver among the operation | movement in the case of calibrating an image display part. It is a figure which shows notionally the flow of operation | movement in the case of calibrating an image display part. It is a flowchart explaining operation | movement by the side of a transmission apparatus among operation | movement in the case of calibrating an imaging part. It is a flowchart explaining the operation | movement by the side of a receiver among the operations in the case of calibrating an imaging part. It is a figure which shows notionally the flow of operation | movement in the case of calibrating an imaging part. It is an example of the application screen displayed on a display used in order to perform visible light communication. It is an example of the application screen displayed on a display used in order to perform visible light communication.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 50 ... Mobile phone, 51 ... Main part of mobile phone, 52 ... Hinge part of mobile phone, 53 ... Cover part of mobile phone, 121 ... Antenna, 122 ... Speaker, 123 ... Microphone, 124 ... Imaging device, 125 ... Main image display device (main display), 126 ... Sub image display device (sub display), 127 ... Numeric keypad, 128 ... Power key 129: Cross key, 130: Enter key, 131: Rear key, 132 ... Transmission key, 210 ... CPU, 220 ... Imaging unit, 221 ... Imaging module, 222 .. Imaging calibration unit, 223 ... Imaging conversion unit, 224 ... Data reception unit, 225 ... Calibration coefficient or function of imaging unit, 230 ... Image display unit, 231 ... Image display module, 23 2 ... image display calibration unit, 233 ... image display conversion unit, 234 ... data transmission unit, 235 ... calibration coefficient or function of image display unit, 245 ... character code / color data correspondence table 255 ... Character code / lighting pattern correspondence table, 290 ... ROM, 291 ... RAM, 292 ... I / O interface, 293 ... Battery, 294 ... External recording device, 295 ... ..Communication control unit, 296 ... sound output unit, 297 ... sound input unit, 298 ... operation input unit, 410 ... transmitting device when performing visible light communication, 411 ... sending device Operation display image display device (main display), 412... Transmission device side image display device (sub display), 413... Transmission device side imaging device (camera), 415. ,..., An arrow indicating the direction of image capturing for data reception, 416... An arrow indicating the direction of image display on the transmission device side, 420... Receiving device when performing visible light communication, 421. Image display device for operation guidance on the receiving device side (main display), 422 ... Image display device on the receiving device side (sub-display), 423 ... Imaging device on the receiving device side (camera), 425 ... Arrow indicating the direction in which the receiving device side captures an image for data reception, 426... Arrow indicating the direction in which the receiving device displays an image for data transmission, 850..., Calibration start when calibrating the image display unit Request signal, 860... Calibration start permission signal during calibration of image display unit, 870... Calibration start signal during calibration of image display unit, 880. Signal relating to color to be adjusted at the time of calibration of image display unit, 890... Recognition result signal on reception side at the time of calibration of image display unit, 1150... Calibration at the time of calibration of imaging unit Start request signal, 1160... Calibration start permission signal at the time of image capturing unit calibration, 1170... Calibration start signal at the time of image capturing unit calibration, 1180... Adjustment at the time of image capturing unit calibration Signal relating to color to be performed, 1190... Calibration end signal at the time of calibration of the imaging unit

Claims (5)

Conversion means for converting information to be transmitted into emission color data that changes in time series, and transmission means for transmitting the information by emitting light represented by the emission color data obtained by the conversion means. A transmission device, an imaging means for continuously imaging light emitted by the transmission device, and a restoration means for restoring the information based on a light emission mode of light continuously imaged by the imaging means. An information communication system configured with a receiving device,
The transmission device includes transmission control means for controlling the transmission means to transmit light of each color and information indicating each color to the reception device before transmitting the information,
The receiving device includes: an imaging control unit that controls the imaging unit so as to continuously capture the light of each color and information indicating each color; the light of each color captured by the imaging control unit and each of these colors An information communication system comprising: calibration means for calibrating the imaging characteristics of the luminescent color imaged by the imaging means based on the information indicating. An information communication system comprising a plurality of devices equipped with imaging means for imaging light and performing information communication between the devices,
Each of the devices is
Conversion means for converting information to be transmitted into emission color data that changes in time series;
Transmitting means for transmitting the information by emitting light represented by the emission color data obtained by the conversion means;
Restoring means for restoring information on the basis of the light emission mode continuously imaged by the imaging means;
Before transmitting the information, transmission control means for controlling the transmission means to transmit light of each color and information indicating each of these colors to a communication partner device;
The imaging unit is controlled so that the communication partner device that responds to the light of each color transmitted by the transmission unit and the information indicating each color transmits the light emission information indicating the result of the response to capture the light emission information. Imaging control means for
Reconstructing the light emission information imaged by this imaging means, and based on the reconstructed light emission information, calibration means for calibrating the light emission color characteristics of the transmission means,
An information communication system comprising: Conversion means for converting information to be transmitted into emission color data that changes in time series, transmission means for transmitting the information represented by the emission color data obtained by the conversion means, and light In an information communication device comprising imaging means for imaging
Before transmitting the information, transmission control means for controlling the transmission means to transmit light of each color and information indicating each of these colors to a communication partner device;
The imaging unit is controlled so that the communication partner device that responds to the light of each color transmitted by the transmission unit and the information indicating each color transmits the light emission information indicating the result of the response to capture the light emission information. Imaging control means for
Reconstructing the light emission information imaged by this imaging means, and based on the reconstructed light emission information, calibration means for calibrating the light emission color characteristics of the transmission means,
An information communication apparatus comprising: A conversion step for converting information to be transmitted into emission color data that changes in time series, and a first transmission for transmitting the information by emitting light represented by the emission color data obtained in the conversion step An information communication method comprising steps,
Before transmitting the information, a second transmission step of transmitting light of each color and light emission information indicating each of these colors to a communication partner;
An imaging step for imaging the light emission information when the communication partner responding to the light of each color transmitted in the second transmission step and the information indicating each color transmits the light emission information indicating the result of the response; ,
A calibration step for restoring the emission information captured in this imaging step and calibrating the characteristics of the emission color emitted in the transmission step based on the restored emission information;
An information communication method comprising: A light emitting device that emits light according to the control of the computer, and the computer to which an imaging device that images light according to the control of the computer is connected;
Conversion means for converting information to be transmitted into emission color data that changes in time series;
Transmitting means for transmitting the information by emitting light represented by the emission color data obtained by the conversion means;
Before transmitting the information, transmission control means for controlling the transmission means to transmit light of each color and information indicating each of these colors to a communication partner device;
Controls the imaging device to capture the light emission information when the communication partner device responding to the light of each color transmitted by the transmission means and the information indicating each color transmits the light emission information indicating the result of the response Imaging control means for
Reconstructing the light emission information imaged by this imaging device, and based on the reconstructed light emission information, calibration means for calibrating the light emission color characteristics of the transmission means,
Program to make it function.

Images