JP2018121169A - Light-emitting device, photoreceiver, information processing system, information processing method and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an optical communication suitable for transmission of information with high confidentiality.SOLUTION: A light-emitting device 100 emits light with a hue value changed from a reference value in regard to a hue value of light of each of Red(R), Green(G) and Blue(B) when emitting light according to a light emission pattern corresponding to a light signal packet format. The photoreceiver 200 performs a process to restore hue values of Red(R), Green(G) and Blue(B) in a color change region back to reference values as to a plurality of frames of a period corresponding to the light signal packet format, decodes a bit data array corresponding to hue values, and acquires information of a communication target for each of the colors of Red(R), Green(G) and Blue(B) of which the hue values are restored to reference values.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a light emitting device, a light receiving device, an information processing system, an information processing method, and a program.

  In optical communication that transmits arbitrary information using light as a communication medium, information is transmitted by the light source on the transmission side emitting light while changing the light, and the change in the light contained in the image received by the reception side is acquired. There is a technique for acquiring information by decoding a change (see, for example, Patent Document 1).

JP 2013-9074 A

  In the optical communication described above, when the transmitting side emits light while switching between a plurality of colors, red (R), green (G), and blue (B), which are so-called three colors set at equal angles in hue. It is assumed that data to be transmitted is modulated by a combination of the above, and there is a problem that the modulation pattern variation tends to be a monotonous combination. Such a mechanism of the modulation pattern has a problem that it is not suitable for transmitting highly confidential information.

  The present invention has been made in view of such problems, and an object thereof is to enable optical communication suitable for transmission of highly confidential information.

In order to achieve the above object, a light emitting device according to the present invention includes:
A light emitting means for emitting light modulated by arbitrary information;
Light emission control means for changing any one of the hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value;
It is characterized by providing.

  ADVANTAGE OF THE INVENTION According to this invention, the optical communication suitable for transmission of highly confidential information is attained.

It is a figure which shows the structure of the optical communication system which concerns on embodiment of this invention. It is a figure which shows the structure of a light-emitting device. It is a figure which shows an example of the format of an optical signal packet. It is a figure which shows the structure of a light-receiving device. It is a 1st flowchart which shows operation | movement of a light-emitting device. It is a figure which shows the 1st example of the hue value substitution in a light emission pattern. It is a figure which shows the 1st example of a color plane. It is a 1st flowchart which shows operation | movement of a light-receiving device. It is a 2nd flowchart which shows operation | movement of a light-emitting device. It is a figure which shows the 2nd example of hue value substitution in a light emission pattern. It is a figure which shows the 2nd example of a color plane. It is a 2nd flowchart which shows operation | movement of a light-receiving device.

  Hereinafter, an optical communication system according to an embodiment of the present invention will be described. As shown in FIG. 1, the optical communication system 1 according to the embodiment of the present invention includes a light emitting device 100 and a light receiving device 200.

  In the optical communication system 1, the light emitting device 100 and the light receiving device 200 can communicate from the light emitting device 100 to the light receiving device 200 using light as a communication medium.

  The light emitting device 100 changes the information to be communicated to the light receiving device 200 in time series of red (R), green (G), and blue (B) by modulation, and black (Bk) in the header portion that is the extinguishing period. Is converted into an optical signal including

  The light receiving device 200 receives an optical signal from the light emitting device 100 by imaging the light emitting device 100 included in the imaging range. The light receiving device 200 displays an image obtained by imaging. In addition, the light receiving device 200 decodes information to be communicated from the received optical signal and displays the information.

  Next, the light emitting device 100 will be described. As illustrated in FIG. 2, the light emitting device 100 includes a control unit 102, a memory 104, and a light emitting diode (LED) 114.

  The control unit 102 includes a CPU (Central Processing Unit), and performs software processing according to a program stored in the memory 104, and functions to realize various functions included in the light emitting device 100.

  The memory 104 is, for example, a RAM (Random Access Memory) serving as a work area and a ROM (Read Only Memory) storing a basic operation program. The memory 104 stores various information (programs and the like) used for control and the like in the light emitting device 100.

  The encoding / modulating unit 110 in the control unit 102 encodes information to be communicated into a bit data string. Furthermore, the encoding / modulation unit 110 performs digital modulation based on the bit data string. For example, 4PPM (Pulse Position Modulation) using a carrier wave having a frequency of 28.8 (kHz) is employed as the modulation method.

  The drive unit 112 in the control unit 102 determines a light emission pattern based on the signal generated by the encoding / modulation unit 110 and a predetermined format of the optical signal packet. ), Green (G), and blue (B) light is turned on while temporally changing at the change period t1, and is controlled to be turned off during the turn-off period corresponding to the header. At this time, the drive unit 112 performs control to turn on the hue values of the red (R), green (G), and blue (B) lights with the hue values changed from the reference values.

  FIG. 3 is a diagram illustrating an example of the format of an optical signal packet. The format of the optical signal packet shown in FIG. 3 includes a light emission pattern in which one light emission period is time t1 (change period t1) and has a time length tm that is 12 times the time t1. Specifically, the optical signal corresponding to the format of the optical signal packet shown in FIG. 3 includes two black (Bk) light emission during the extinguishing period corresponding to the header and one red (R) corresponding to the type. Light emission, one of seven red (R), green (G), and blue (B) corresponding to data, and two red (R), green (G), blue (corresponding to parity) The light emission pattern which consists of light emission in any one of B) is shown.

  The LED 114 temporally changes red (R), green (G), and blue (B) light having a hue value changed from the reference value during the lighting period with a change period t1 under the control of the driving unit 112. And the light is turned off during the turn-off period corresponding to the header.

  Next, the light receiving device 200 will be described. The light receiving device 200 displays a captured image and functions as a communication device for receiving information from the light emitting device 100. As shown in FIG. 4, the light receiving device 200 includes a control unit 202, a memory 204, an operation unit 206, a display unit 207, and an imaging unit 214.

  The control unit 202 is configured by a CPU. The control unit 202 functions to realize various functions of the light receiving device 200 by executing software processing in accordance with a program stored in the memory 204.

  The memory 204 is, for example, a RAM or a ROM. The memory 204 stores various information (programs and the like) used for control and the like in the light receiving device 200.

  The operation unit 206 is a touch panel disposed on the upper surface of the display area of the display unit 207, and is an interface used for inputting user operation details. The display unit 207 includes, for example, an LCD (Liquid Crystal Display), a PDP (Plasma Display Panel), an EL (Electro Luminescence) display, and the like, and displays an image.

  The imaging unit 214 is disposed on the surface of the housing of the light receiving device 200 opposite to the surface on which the display unit 207 is installed. The imaging unit 214 includes a lens and a light receiving element. The lens is composed of a zoom lens or the like, and moves by zoom control and focus control by the control unit 202. The imaging angle of view and optical image of the imaging unit 214 are controlled by movement of the lens. The light receiving element is composed of a plurality of light receiving elements regularly arranged two-dimensionally on the light receiving surface. The light receiving element is, for example, an imaging device on which a photodiode or a Bayer color filter is mounted, or an imaging device such as a three-plate CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

  The imaging unit 214 performs imaging at an imaging cycle t2 that is the same as or shorter than the light change cycle t1 of the LED 114 in the light emitting device 100. The imaging unit 214 captures (receives light) the incident optical image with an imaging field angle within a predetermined range based on a control signal from the control unit 202, and sequentially controls the image signal within the imaging field angle. Output to.

  Each time the image acquisition unit 232 in the control unit 202 acquires an image signal from the imaging unit 214, the image acquisition unit 232 converts the image signal into digital data to generate a frame. As described above, in response to the imaging cycle of the imaging unit 214 being t2, the image acquisition unit 232 generates a frame every time t2.

  The conversion unit 233 in the control unit 202 includes, in a plurality of frames for a period (tm) corresponding to the format of the optical signal packet acquired continuously in time series, among parameters defining the optical signal, A pixel area where the hue (H: Hue) is sequentially switched to one of red (R), green (G), and blue (B) is detected as a color change area. When the position of the color change area changes in a plurality of frames, the conversion unit 233 can detect the color change area following the change in position. Furthermore, the conversion unit 233 detects black (Bk) corresponding to the header that is the extinguishing period in the color of the color change area in a plurality of frames corresponding to the format corresponding to the format of the optical signal packet.

  Next, the conversion unit 233 returns the hue values of red (R), green (G), and blue (B) in the color change region to the reference values in a plurality of frames for a period corresponding to the format of the optical signal packet. Process.

  The decoding unit 234 in the control unit 202 has red (R) and green that return the hue value following the head (header) to the reference value for the color change regions of a plurality of frames corresponding to the format of the optical signal packet. For each color of (G) and blue (B), control is performed so as to decode the bit data string corresponding to the hue value, and communication target information is acquired.

  A display control unit 235 in the control unit 202 performs control to display a frame image and a communication target information image on the display unit 207.

  Next, operations of the light emitting device 100 and the light receiving device 200 during communication will be described. FIG. 5 is a first flowchart showing the operation of the light emitting device 100.

  The control unit 102 of the light emitting device 100 determines a light emission pattern in the optical signal packet according to information to be communicated (step S101). Specifically, the encoding / modulating unit 110 in the control unit 102 encodes information to be communicated into a bit data string. Furthermore, the encoding / modulation unit 110 performs digital modulation based on the bit data string. Based on the signal generated by the encoding / modulating unit 110 and the format of the optical signal packet shown in FIG. 3, the driving unit 112 in the control unit 102 performs red (R) and green (G) on the LED 114. The blue (B) light is turned on while temporally changing at the change period t1, and the light emission pattern to be turned off during the turn-off period corresponding to the header is determined. At this stage, the red (R) hue value included in the light emission pattern is the reference value R0, the green (G) hue value is the reference value G0, and the blue (B) hue value is the reference value B0. In the present embodiment, the median value of each color of red (R), green (G), and blue (B) is adopted as each reference value. However, the present invention is not limited to this. A value obtained by adding an arbitrary angle (θ) in advance may be adopted as the reference value. Further, instead of setting a common angle for each color, a value obtained by adding a different angle for each color or setting such a specific color only may be adopted as a reference value. By doing in this way, the secrecy of the information to transmit can be improved further.

  Next, the drive unit 112 calculates a new hue value R ′ by adding the hue value θR to the reference value R0, which is a red (R) hue value included in the light emission pattern, and obtains a G (green) hue. A new hue value G ′ is calculated by adding the hue value θG to the reference value G0 which is the value, and a new hue value is obtained by adding the hue value θB to the reference value B0 which is the hue value of blue (B). B ′ is calculated (step S102). FIG. 6 is a diagram illustrating a first example of hue value replacement in a light emission pattern. In FIG. 6, the hue value of red (R) is replaced with reference values R0 to R ′, the hue value of green (G) is replaced with reference values G0 to G ′, and the hue value of blue (B) is the reference value. Substitution from B0 to B ′.

  FIG. 7 is a diagram illustrating a first example of a color plane. A color is specified by hue, lightness, and saturation. Of the hue (H), lightness (V), and saturation (S), the hue (H) is shown in the circumferential direction of the color plane as shown in FIG. Red (R), green (G), and blue (B) are classified by hue values, and the boundary value between the hues of red (R) and green (G) is indicated by a boundary value 521, and green (G) and blue ( The boundary value of the hue of B) is indicated by the boundary value 522, and the boundary value of the hues of blue (B) and red (R) is indicated by the boundary value 523.

  Further, the median value of the red region sandwiched between the boundary value 521 and the boundary value 523 becomes the reference value R0. The median value of the green region sandwiched between the boundary value 522 and the boundary value 521 becomes the reference value G0. The median value of the blue region sandwiched between the boundary value 522 and the boundary value 523 is the reference value B0. Further, when the hue value θR is added to the reference value R0 of the red (R) hue value, the hue value R ′ is obtained, and when the hue value θG is added to the reference value G0 of the green (G) hue value, the hue value G ′ is obtained. The hue value B ′ is obtained by adding the hue value θB to the reference value B0 of the hue value of blue (B).

  Here, the addition values θR, θG, and θB are shared between the light emitting device 100 and the light receiving device 200 in advance. The added values θR, θG, and θB may be the same value or different values. Also, θR, θG, and θB may be time functions θR (t), θG (t), and θB (t) that change with time. For example, θR (t), θG (t), and θB (t) change with the passage of time, with the timing of the head (header) of the optical signal packet being time 0. When the time functions θR (t), θG (t), and θB (t) are used, the timing at time 0 is shared between the light emitting device 100 and the light receiving device 200 in advance.

  Returning again to FIG. After the red (R) hue value included in the light emission pattern is changed to R ′, the green (G) hue value is changed to G ′, and the blue (B) hue value is changed to B ′ by the processing in step S102, the drive unit 112 lights the LED 114 with red (R), green (G), and blue (B) light while changing temporally in the change period t1, based on the light emission pattern after the hue value is changed. Control to turn off the light during the light-off period corresponding to the header is performed. Under the control of the driving unit 112, the LED 114 controls red (R) light having a hue value R ′, green (G) light having a hue value G ′, and blue (B) having a hue value B ′ in the lighting period. Are output while being temporally changed at the change period t1, and are turned off during the turn-off period corresponding to the header (step S103).

  FIG. 8 is a first flowchart showing the operation of the light receiving device 200. The imaging unit 214 performs imaging with the same imaging cycle t2 as the light change cycle t1 of the LED 114 in the light emitting device 100, and sequentially outputs image signals within the imaging field angle to the control unit 202. Each time the image acquisition unit 232 in the control unit 202 acquires an image signal from the imaging unit 214, the image acquisition unit 232 converts the image signal into digital data to generate a frame (step S201).

  The conversion unit 233 in the control unit 202 detects a color change region in a plurality of frames for a period corresponding to the format of the optical signal packet, which is continuously acquired in time series (step S202).

  Next, the conversion unit 233 subtracts the hue value θR from the red (R) hue value R ′ in the color change region in a plurality of frames for a period corresponding to the format of the optical signal packet. By this subtraction, the original reference value R0 is obtained. Similarly, the conversion unit 233 subtracts the hue value θG from the hue value G ′ of green (G) in the color change region in a plurality of frames for a period corresponding to the format of the optical signal packet, thereby obtaining the original reference value G0 is acquired, and the original reference value B0 is acquired by subtracting the hue value θB from the blue (B) hue value B ′ in the color change region (step S203).

  Next, the decoding unit 234 in the control unit 202 uses the reference value R0 as the red (R) hue value for the color change regions of a plurality of frames corresponding to the format of the optical signal packet, and uses the reference value G0. Is used as the hue value of green (G) and the reference value B0 is used as the hue value of blue (B), control is performed to decode the bit data string corresponding to the hue value, and information to be communicated is obtained (step) S204).

  Next, other operations of the light emitting device 100 and the light receiving device 200 during communication will be described. FIG. 9 is a second flowchart showing the operation of the light emitting device 100.

  The control unit 102 of the light emitting device 100 determines a light emission pattern in the optical signal packet according to information to be communicated (step S301). Specifically, this is the same as step S101 in FIG.

  Next, for the red (R) hue value included in the light emission pattern, the driving unit 112 obtains n hue values R1, R2,. For the green (G) hue value included, n hue values G1, G2,... Gn whose average value is the reference value G0 are acquired, and the blue (B) hue value included in the light emission pattern is obtained. N hue values B1, B2,... Bn whose average value is the reference value B0 are acquired (step S302).

  Next, the drive unit 112 assigns the hue value R1 to red (R), the hue value G1 to green (G), and the hue value B1 to blue (B) in the light emission pattern determined in step S301, and the hue value R1. , G1, and B1 are acquired. In addition, the driving unit 112 assigns the hue value R2 to red (R), the hue value G2 to green (G), and the hue value B2 to blue (B) in the light emission pattern determined in step S301. A second light emission pattern composed of a combination of G2 and B2 is acquired. The driving unit 112 repeats the same processing, and in the light emission pattern determined in step S301, assigns a hue value Rn to red (R), a hue value Gn to green (G), and a hue value Bn to blue (B), An nth emission pattern composed of a combination of hue values Rn, Gn, and Bn is acquired. As a result, as shown in FIG. 10, n light emission patterns from the first light emission pattern to the nth light emission pattern are acquired (step S303).

  Here, the use of n light emission patterns from the first light emission pattern to the nth light emission pattern is shared between the light emitting device 100 and the light receiving device 200 in advance.

  FIG. 11 is a diagram illustrating a second example of a color plane. In the color plane shown in FIG. 11, the hue (H) is shown in the circumferential direction of the color plane, as in the color plane shown in FIG. Red (R), green (G), and blue (B) are classified by hue values, and the boundary value between the hues of red (R) and green (G) is indicated by a boundary value 521, and green (G) and blue ( The boundary value of the hue of B) is indicated by the boundary value 522, and the boundary value of the hues of blue (B) and red (R) is indicated by the boundary value 523. Further, the median value of the red region sandwiched between the boundary value 521 and the boundary value 523 becomes the reference value R0. The median value of the green region sandwiched between the boundary value 522 and the boundary value 521 becomes the reference value G0. The median value of the blue region sandwiched between the boundary value 522 and the boundary value 523 is the reference value B0.

  Further, the average value of the hue values R1, R2,... Rn becomes the reference value R0 of the hue value of red (R), and the average value of the hue values G1, G2,. The average value of the hue values B1, B2,... Bn becomes the reference value B0 of the blue (B) hue value.

  Again, returning to FIG. After the n light emission patterns from the first light emission pattern to the nth light emission pattern are acquired by the process of step S303, the driving unit 112 adds 1 to the initial value 0 of the coefficient k to obtain k = 1 ( Step S304). Furthermore, the drive unit 112 changes the red (R), green (G), and blue (B) light to the LED 114 based on the first light emission pattern according to k = 1. Control is performed so that the light is turned on while changing at time t1 and the light is turned off during the light-out period corresponding to the header. The LED 114 temporally changes red (R), green (G), and blue (B) light having a hue value changed from the reference value during the lighting period with a change period t1 under the control of the driving unit 112. In addition, the light is output and the light is turned off during the light-out period corresponding to the header (step S305).

  Next, the drive unit 112 determines whether or not k = n (step S306). If k = n is not satisfied (step S306; NO), a process of adding 1 to k again (step S304) and light emission according to the kth light emission pattern based on the value of k (step S305) are performed.

  On the other hand, if k = n (step S306; YES), it means that the light emission from the first light emission pattern to the light emission in the nth light emission pattern is completed. In this case, a series of operations ends.

  FIG. 12 is a second flowchart showing the operation of the light receiving device 200. The imaging unit 214 performs imaging with the same imaging cycle t2 as the light change cycle t1 of the LED 114 in the light emitting device 100, and sequentially outputs image signals within the imaging field angle to the control unit 202. Each time the image acquisition unit 232 in the control unit 202 acquires an image signal from the imaging unit 214, the image acquisition unit 232 converts the image signal into digital data to generate a frame (step S401).

  When the conversion unit 233 in the control unit 202 determines that the number of frames corresponding to the period corresponding to the format of the optical signal packet × n obtained continuously in time series has been acquired, the color change A region is detected (step S402). If the number of times is less than n, the frames are sequentially fetched until n times.

  Next, the conversion unit 233 generates a frame set for each period corresponding to the format of the optical signal packet for the number of frames corresponding to the period corresponding to the format corresponding to the format of the optical signal packet × n. N frame sets are generated. Further, the conversion unit 233 calculates the average value of the hue values of the color change areas of the frames at the same time position in each of the n frame sets (step S403).

  Here, the frame at the same time position means, for example, a frame corresponding to a hatched portion in each of the first light emission pattern to the nth light emission pattern in FIG.

  By calculating the average value of the hue value of the color change area of the frame at the same time position in each of the n frame sets, the hue value of red (R) is expressed by R1 + R2 +... + Rn / n A reference value R0 is obtained. For the hue value of green (G), the original reference value G0 is obtained by G1 + G2 +... + Gn / n. For the hue value of blue (B), the original reference value B0 is obtained by B1 + B2 +... + Bn / n. Then, by arranging the average values of the hue values of the color change areas of the frames at the same time position in each of the n frame sets, the original light emission pattern shown in FIG. 10 is obtained.

  Next, the decoding unit 234 in the control unit 202 uses the reference value R0 as the red (R) hue value for the color change regions of a plurality of frames corresponding to the format of the optical signal packet, and uses the reference value G0. Is used as the hue value of green (G) and the reference value B0 is used as the hue value of blue (B), control is performed to decode the bit data string corresponding to the hue value, and information to be communicated is obtained (step) S404).

  As described above, in the optical communication system 1 according to the present embodiment, the light emitting device 100 emits red (R), green (G), and blue (G) when emitting light with a light emission pattern corresponding to the format of the optical signal packet. Regarding the hue value of each light of B), light is emitted with the hue value changed from the reference value. On the other hand, the light receiving device 200 performs processing for returning the hue values of red (R), green (G), and blue (B) in the color change region to the reference value in a plurality of frames for a period corresponding to the format of the optical signal packet. For each of the red (R), green (G), and blue (B) colors whose hue values have been returned to the reference values, the bit data string corresponding to the hue value is decoded to obtain information to be communicated.

  Specifically, the light emitting device 100 sets the hue value R ′ obtained by adding the hue value θR to the reference value R0 that is the hue value of red (R) and the reference value G0 that is the hue value of G (green). Light emission is performed at each hue value of the hue value G ′ obtained by adding the hue value θG and the hue value B ′ obtained by adding the hue value θB to the reference value B0 that is the hue value of blue (B). On the other hand, the light receiving device 200 subtracts the hue value θR from the red (R) hue value R ′ in the color change region in a plurality of frames corresponding to the format of the optical signal packet to obtain the original reference value R0. The hue value θG is subtracted from the hue value G ′ of green (G) in the color change area to obtain the original reference value G0, and the hue is calculated from the hue value B ′ of blue (B) in the color change area The original reference value B0 is obtained by subtracting the value θB. Further, the light receiving device 200 uses the reference value R0 as the hue value of red (R) and the reference value G0 of green (G) for the color change regions of a plurality of frames corresponding to the format of the optical signal packet. Using the hue value and the reference value B0 as the blue (B) hue value, the bit data string corresponding to the hue value is decoded to obtain information to be communicated.

  Alternatively, the light emitting device 100 acquires n hue values R1, R2,... Rn whose average value is the reference value R0 for the red (R) hue value, and for the green (G) hue value, N hue values G1, G2,... Gn whose average value is the reference value G0 are obtained, and n hue values B1, whose average value is the reference value B0, for the hue value of blue (B), B2... Bn is acquired. Furthermore, the light emitting device 100 obtains from the first light emission pattern composed of a combination of hue values R1, G1, and B1 to the nth light emission pattern composed of a combination of hue values Rn, Gn, and Bn. Light emission is performed with n light emission patterns up to n light emission patterns. On the other hand, the light receiving device 200 generates a frame set for each period corresponding to the format of the optical signal packet, for the number of frames corresponding to the period corresponding to the format of the optical signal packet × n. Next, the light receiving device 200 calculates the average value of the hue value of the color change region of the frame at the same time position in each of the n frame sets, so that the hue value of red (R) is R1 + R2 +. The original reference value R0 is acquired by + Rn / n, and the original reference value G0 is acquired by G1 + G2 +... + Gn / n for the hue value of green (G), and the hue value of blue (B) For B, the original reference value B0 is obtained by B1 + B2 +... + Bn / n, and the average values of the hue values of the color change regions of the frames at the same time position in each of the n frame sets are arranged in time order. Then, the original light emission pattern is acquired. Further, the light receiving device 200 uses the reference value R as the hue value of red (R) and the reference value G0 of green (G) for the color change regions of a plurality of frames corresponding to the format of the optical signal packet. Using the hue value and the reference value B0 as the blue (B) hue value, the bit data string corresponding to the hue value is decoded to obtain information to be communicated.

  In this way, the light emitting device 100 emits light with the hue value changed from the reference value for the hue value of each light of red (R), green (G), and blue (B), and the light receiving device 200 changes the color. Since the process of returning the hue values of red (R), green (G), and blue (B) in the region to the reference value is performed, it is difficult to be intercepted by a third party.

  Further, by setting the hue values θR, θG, and θB, which are addition values, as time functions θR (t), θG (t), and θB (t), respectively, it is difficult to be intercepted by a third party. Furthermore, since it is assumed that the number of frames corresponding to the period corresponding to the format of the optical signal packet × n is acquired as a start condition of the decoding process, a third party who does not know the number of times n There is an effect that it is difficult to intercept information by optical communication.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible. For example, in the above-described embodiment, each of the first light emission pattern composed of the combination of the hue values R1, G1, and B1 to the nth light emission pattern composed of the combination of the hue values Rn, Gn, and Bn is included in one optical signal packet. Although it corresponds, it may be a light emission pattern corresponding to a plurality of optical signal packets, or may be a light emission pattern not corresponding to one or a plurality of optical signal packets.

  In the above-described embodiment, the case where the light emitting device 100 changes the hue values of red (R), green (G), and blue (B) from the reference values has been described. Any one or two hue values of R), green (G), and blue (B) may be changed from the reference value.

  Moreover, although embodiment mentioned above demonstrated the case where red (R), green (G), blue (B), and black (Bk) were used for optical communication, another color may be used. Similarly, in this case, the light emitting device 100 emits light with the hue value changed from the reference value for the hue value of each light, and the light receiving device 200 returns the hue value of each color in the color change region to the reference value. I do.

  In the above-described embodiment, the light receiving device 200 returns the hue value of each color in the color change region to the reference value. However, the light receiving device 200 may not be strictly the reference value but may be a value that approximates the reference value. is there. In such a case, the light receiving device 200 uses the value approximate to the reference value as the hue value of red (R), the hue value of green (G), and the hue value of blue (B), and sets the hue value. What is necessary is just to decode a corresponding bit data sequence and acquire information to be communicated.

  In the above-described embodiment, the case where the light emitting device 100 changes the hue value from the reference value and the light receiving device 200 returns the hue value to the reference value has been described. However, it is not limited to this. For example, when the light emitting device 100 emits light with a light emission pattern corresponding to the format of the optical signal packet, the hue value, brightness value, and saturation value of each light of red (R), green (G), and blue (B). For any of these, light is emitted with a value changed from the reference value. In this case, the light emitting device 100 may emit light having a value obtained by adding a predetermined value to any one of the reference values of hue value, lightness value, and saturation value, and the predetermined value may be a function of time. Further, the light emitting device 100 may emit a plurality of lights whose values are such that the average value is any one of the hue value, the brightness value, and the saturation value. On the other hand, the light receiving device 200 performs processing for returning any of the hue value, brightness value, and saturation value of red (R), green (G), and blue (B) in the color change region to the reference value. In this case, the light receiving device 200 obtains a reference value by subtracting a predetermined value from any one of the hue value, lightness value, and saturation value. Alternatively, the light receiving device 200 calculates an average value of any one of the hue value, the lightness value, and the saturation value, and acquires it as a reference value. Further, the light receiving device 200 decodes the bit data string corresponding to any one of the hue value, the lightness value, and the saturation value for each color of red (R), green (G), and blue (B) returned to the reference value. Then, information for communication is acquired.

  In the above-described embodiment, the change period t1 of the light emitted from the light emitting device 100 is the same as the imaging period and the frame generation period t2 in the light receiving device 200. However, t2 may be t1 or less. . For example, when the imaging cycle and the frame generation cycle t2 in the light receiving device 200 are ½ of the change period t1 of the light emitted from the light emitting device 100, the plurality of frames for the period corresponding to the format of the optical signal packet is The number of frames is twice that of the above-described embodiment.

  Moreover, LED114 in the light-emitting device 100 may be comprised in a part of display part, for example.

  The light receiving device 200 may be any device as long as it can receive light. For example, a PHS (Personal Handy-phone System), a PDA (Personal Digital Assistant or Personal Data Assistance), a tablet PC (Personal Computer), a game device, a portable music player, and the like may be used.

  Alternatively, a device having both the function of the light receiving device 200 and the function of the light emitting device 100 may be prepared so that both functions can be used properly according to the situation.

  In each of the above embodiments, the program to be executed is stored on a computer-readable recording medium such as a flexible disk, a CD-ROM (Compact Disc-Read Only Memory), a DVD (Digital Versatile Disc), or an MO (Magneto Optical disc). A system that executes the above-described processing may be configured by storing and distributing and installing the program.

  Further, the program may be stored in a disk device or the like of a predetermined server on a network such as the Internet, and may be downloaded, for example, superimposed on a carrier wave.

  Note that when the above functions are realized by sharing an OS (Operating System) or when the functions are realized by cooperation between the OS and an application, only the part other than the OS may be stored in a medium and distributed. You may also download it.

  As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to the specific embodiment which concerns, This invention includes the invention described in the claim, and its equivalent range It is. Hereinafter, the invention described in the scope of claims of the present application will be appended.

(Appendix 1)
A light emitting means for emitting light modulated by arbitrary information;
Light emission control means for changing any one of the hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value;
A light emitting device comprising:

(Appendix 2)
The light emitting device according to appendix 1, wherein the light emission control means controls to change only a predetermined angle in the hue when changing the hue value of the light emitted by the light emitting means.

(Appendix 3)
The light emitting device according to appendix 2, wherein the predetermined angle in the hue is defined by a function having time as a variable.

(Appendix 4)
A light receiving means for receiving light modulated by arbitrary information;
Replacement means for replacing any of the hue value, lightness value, and saturation value of the light received by the light receiving means with a predetermined arbitrary value in each parameter;
Decoding from an arbitrary value replaced by the replacement means, and acquiring the arbitrary information;
A light receiving device comprising:

(Appendix 5)
5. The light receiving device according to appendix 4, wherein when the hue value of the light received by the light receiving unit is changed, the replacing unit changes the hue value by a predetermined angle and replaces it with the arbitrary value. apparatus.

(Appendix 6)
The light receiving device according to claim 5, wherein the predetermined angle in the hue is defined by a function having time as a variable.

(Appendix 7)
The change in light modulated by the arbitrary information is a repetition of a predetermined pattern in which any one of the hue value, lightness value, and saturation value of the light is changed,
The replacement unit obtains an average value of any one of a hue value, a lightness value, and a saturation value of the light when the light receiving unit receives light of a predetermined number of times of the predetermined pattern, The light receiving device according to any one of appendices 4 to 6, wherein the light receiving device is replaced with the arbitrary value based on the acquisition result.

(Appendix 8)
An information processing system that transmits arbitrary information using light as a communication medium between a light emitting device and a light receiving device,
The light emitting device
A light emitting means for emitting light modulated by the arbitrary information;
Light emission control means for changing any one of the hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value;
With
The light receiving device is:
A light receiving means for receiving light modulated by the arbitrary information;
Replacement means for replacing any of the hue value, lightness value, and saturation value of the light received by the light receiving means with a predetermined arbitrary value in each parameter;
Decoding from an arbitrary value replaced by the replacement means, and acquiring the arbitrary information;
An information processing system comprising:

(Appendix 9)
The light emission control means, when changing the hue value of the light emitted by the light emission means, is changed by a predetermined angle in the hue,
9. The information processing system according to appendix 8, wherein the replacement means changes the hue value of the light by the predetermined angle and replaces it with the arbitrary value.

(Appendix 10)
The information processing system according to claim 9, wherein the predetermined angle in the hue is defined by a function having time as a variable.

(Appendix 11)
The change in light modulated by the arbitrary information is a repetition of a predetermined pattern in which any one of the hue value, lightness value, and saturation value of the light is changed,
The light emission control means controls the light emission means to repeatedly emit light in the predetermined pattern,
The replacement unit obtains an average value of any one of a hue value, a lightness value, and a saturation value of the light when the light receiving unit receives light of a predetermined number of times of the predetermined pattern, The information processing system according to any one of appendices 8 to 10, wherein the arbitrary value is substituted based on the acquisition result.

(Appendix 12)
An information processing method in an information processing system for transmitting arbitrary information using light as a communication medium between a light emitting device and a light receiving device,
Light emission control in which the light emitting device changes any one of a hue value, a lightness value, and a saturation value of light modulated by the arbitrary information emitted by the light emitting unit from a predetermined arbitrary value in each parameter by a predetermined value. Steps,
The light receiving device replaces any one of the hue value, lightness value and saturation value of the light received by the light receiving unit with a predetermined arbitrary value in each parameter; and
The light receiving device decodes from the arbitrary value replaced in the replacement step, and acquires the arbitrary information;
An information processing method comprising:

(Appendix 13)
A computer as a light emitting device that transmits arbitrary information using light as a communication medium,
Light emitting means for emitting light modulated by arbitrary information;
Light emission control means for changing any one of hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value,
A program characterized by functioning as

(Appendix 14)
A computer as a light receiving device that receives the light from a light emitting device that transmits arbitrary information using light as a communication medium,
A light receiving means for receiving light modulated by arbitrary information;
Replacement means for replacing any one of the hue value, brightness value, and saturation value of the light received by the light receiving means with a predetermined arbitrary value in each parameter;
Information acquisition means for decoding the arbitrary value replaced by the replacement means and acquiring the arbitrary information;
A program characterized by functioning as

DESCRIPTION OF SYMBOLS 1 ... Optical communication system, 100 ... Light-emitting device, 102, 202 ... Control part, 104, 204 ... Memory, 110 ... Coding / modulation part, 112 ... Drive part, 114 ... LED, 200 ... Light-receiving device, 206 ... Operation part 207 ... Display unit 214 ... Imaging unit 232 ... Image acquisition unit 233 ... Conversion unit 234 ... Decoding unit 235 ... Display control unit 521 ... Boundary value of red and green hues 522 ... Green and blue Hue boundary value 523 ... Blue and red hue boundary value, R0, G0, B0 ... Arbitrary hue value, θR, θG, θB ... Addition value, R ', G', B ', R1, G1, B1 , R2, G2, B2, Rn, Gn, Bn ... Hue value after conversion

Claims (14)

A light emitting means for emitting light modulated by arbitrary information;
Light emission control means for changing any one of the hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value;
A light emitting device comprising:   The light emitting device according to claim 1, wherein the light emission control unit performs control so as to change only a predetermined angle in the hue when the hue value of the light emitted from the light emitting unit is changed.   The light emitting device according to claim 2, wherein the predetermined angle in the hue is defined by a function having time as a variable. A light receiving means for receiving light modulated by arbitrary information;
Replacement means for replacing any of the hue value, lightness value, and saturation value of the light received by the light receiving means with a predetermined arbitrary value in each parameter;
Decoding from an arbitrary value replaced by the replacement means, and acquiring the arbitrary information;
A light receiving device comprising:   5. The change according to claim 4, wherein when the hue value of the light received by the light receiving unit is changed, the replacement unit changes the hue value by a predetermined angle in the hue and replaces it with the arbitrary value. Light receiving device.   The light receiving device according to claim 5, wherein the predetermined angle in the hue is defined by a function having time as a variable. The change in light modulated by the arbitrary information is a repetition of a predetermined pattern in which any one of the hue value, lightness value, and saturation value of the light is changed,
The replacement unit obtains an average value of any one of a hue value, a lightness value, and a saturation value of the light when the light receiving unit receives light of a predetermined number of times of the predetermined pattern, The light receiving device according to claim 4, wherein the light receiving device is replaced with the arbitrary value based on the acquisition result. An information processing system that transmits arbitrary information using light as a communication medium between a light emitting device and a light receiving device,
The light emitting device
A light emitting means for emitting light modulated by the arbitrary information;
Light emission control means for changing any one of the hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value;
With
The light receiving device is:
A light receiving means for receiving light modulated by the arbitrary information;
Replacement means for replacing any of the hue value, lightness value, and saturation value of the light received by the light receiving means with a predetermined arbitrary value in each parameter;
Decoding from an arbitrary value replaced by the replacement means, and acquiring the arbitrary information;
An information processing system comprising: The light emission control means, when changing the hue value of the light emitted by the light emission means, is changed by a predetermined angle in the hue,
9. The information processing system according to claim 8, wherein the replacement unit changes the hue value of the light by the predetermined angle and replaces it with the arbitrary value.   The information processing system according to claim 9, wherein the predetermined angle in the hue is defined by a function having time as a variable. The change in light modulated by the arbitrary information is a repetition of a predetermined pattern in which any one of the hue value, lightness value, and saturation value of the light is changed,
The light emission control means controls the light emission means to repeatedly emit light in the predetermined pattern,
The replacement unit obtains an average value of any one of a hue value, a lightness value, and a saturation value of the light when the light receiving unit receives light of a predetermined number of times of the predetermined pattern, The information processing system according to claim 8, wherein the information is replaced with the arbitrary value based on the acquisition result. An information processing method in an information processing system for transmitting arbitrary information using light as a communication medium between a light emitting device and a light receiving device,
Light emission control in which the light emitting device changes any one of a hue value, a lightness value, and a saturation value of light modulated by the arbitrary information emitted by the light emitting unit from a predetermined arbitrary value in each parameter by a predetermined value. Steps,
The light receiving device replaces any one of the hue value, lightness value and saturation value of the light received by the light receiving unit with a predetermined arbitrary value in each parameter; and
The light receiving device decodes from the arbitrary value replaced in the replacement step, and acquires the arbitrary information;
An information processing method comprising: A computer as a light emitting device that transmits arbitrary information using light as a communication medium,
Light emitting means for emitting light modulated by arbitrary information;
Light emission control means for changing any one of hue value, lightness value, and saturation value of light emitted by the light emitting means from a predetermined arbitrary value in each parameter by a predetermined value,
A program characterized by functioning as A computer as a light receiving device that receives the light from a light emitting device that transmits arbitrary information using light as a communication medium,
A light receiving means for receiving light modulated by arbitrary information;
Replacement means for replacing any one of the hue value, brightness value, and saturation value of the light received by the light receiving means with a predetermined arbitrary value in each parameter;
Information acquisition means for decoding the arbitrary value replaced by the replacement means and acquiring the arbitrary information;
A program characterized by functioning as

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