JP4340608B2 - Communication line establishment system, communication line establishment method, program, and recording medium - Google Patents

Description

  The present invention relates to a system and a method for establishing a communication line between a client terminal carried by a user and an arbitrary information device existing around the user and the information terminal.

  As a short-range wireless communication technology for exchanging information between various information devices and portable terminals, there is IrDA (Infrared Data Association) using infrared communication. IrDA is a communication system based on the industry association established in 1993 to formulate technical specifications for short-range data communication using infrared rays, and the infrared communication standard established by the association. . In this wireless communication system, the version 1.0 specification up to a communicable distance of 1 m and a communication speed of 115.2 kbps, the 1.1 specification up to 1 m and 4 Mbps, the 1.2 specification up to 0.2 m and 115.2 kbps. (Low power consumption version). An infrared communication port is already provided in many portable terminals, and data communication using IrDA is widely used.

  However, in the infrared system, there is a restriction that the infrared ports are opposed to each other between the communication devices and the optical axis thereof is set within a certain range. In addition, IrDA normally requires a distance between infrared ports of about 1 m or less, and is not applicable to communication with a large screen display located at a distance of several meters from a user. Furthermore, after the communication line is established, there is a problem that communication is interrupted if the optical axis between the server device and the portable terminal is blocked by an obstacle such as a passerby.

  As a method for solving these problems, wireless LAN (IEEE802.11a / b / g) and Bluetooth using radio waves have been developed (see, for example, Non-Patent Document 1).

  With the spread of wireless LAN devices and mobile terminals equipped with Bluetooth, various information devices that communicate with these mobile terminals have also been developed. For example, displays and printers having a function of receiving and outputting image information on a mobile phone by Bluetooth have been developed. Home appliances such as coolers have also been developed that have a mechanism for controlling their operation from a mobile phone via Bluetooth. Furthermore, street information terminals (station shop terminals), street displays, and the like are compatible with Bluetooth and the like, and information acquisition operations can be performed from a mobile terminal.

On the other hand, a method has been proposed in which IrDA having directivity and Bluetooth using radio waves are combined to establish a communication line with a device in a direction in which the Bluetooth line is indicated by IrDA (see, for example, Patent Document 1).
Sakai Goo, “Connection between Bluetooth mobile devices becomes cordless”, Information Processing, vol.41, No.2, pp.169-173, 2000. JP 2002-125268 A

  As illustrated in FIG. 10, consider a case where there are a plurality of information devices (hereinafter referred to as “server devices”) that perform short-range wireless communication with a mobile terminal (hereinafter referred to as “client terminal”) around the user. For example, the server apparatuses A to E in the figure are large displays installed in a public space, and an example in which a user operates information content displayed on an arbitrary display using a button on the client terminal X is shown in this example. Applicable to the situation.

  At this time, it is first necessary to establish a bidirectional communication line between the server device designated by the user and the client terminal. In short-range wireless communication using radio waves, first, a client terminal inquires about a communication ID of a server device existing at a communicable distance and establishes a bidirectional communication channel with the server device that has responded.

  However, when there are a plurality of server devices in the vicinity as in the example of FIG. 10, the client terminal receives responses from the plurality of server devices. As a result, there is a problem that the client terminal cannot specify the communication ID of the server device designated by the user and cannot proceed with the necessary communication line establishment processing.

  On the other hand, in the case of the IrDA method, the user can establish a communication line with the server device by allowing the infrared port of the portable terminal to face the infrared port of an arbitrary server device. However, because of the above-described problem, a bidirectional communication line using radio waves is more convenient.

  Although the above problem can be improved by combining IrDA with radio wave communication, it cannot be applied between terminals that do not have an infrared port.

  An object of the present invention is to use a terminal that does not have an infrared port, specify a specific one from a plurality of information devices and information terminals that exist in the vicinity, and establish a bidirectional communication line by radio waves. To provide an establishment system, an establishment method, a program, and a recording medium.

  In the communication line establishment system and method realized by the present invention, the client terminal includes the optical signal transmission means and the radio wave communication means, and the server device (information device, information terminal) includes the optical signal reception means and the radio wave communication means. An optical signal is first used to establish a communication line, and then a wireless communication line is established by radio waves. Light has high straightness and directivity compared to radio waves. When the user emits an optical signal from the client terminal to an arbitrary server device, only the arbitrary server device receives the optical signal. Furthermore, when the optical signal transmits the terminal ID of the client terminal, the server device can recognize the client terminal to establish a communication line. Therefore, a radio communication line can be easily established thereafter by radio waves.

  That is, in the first communication line establishment system and method of the present invention, the client terminal transmits a terminal ID for specifying its own terminal from the optical signal transmitting means to the optical signal receiving means of the server device, and the terminal ID is determined. The received server device establishes a communication line with the client terminal specified by the terminal ID using wireless communication means.

  In particular, in the second communication line establishment system and method of the present invention for establishing a communication line via the Internet, the client terminal includes optical signal transmission means and Internet communication means, and the server apparatus receives the optical signal. And the Internet communication means, wherein the client terminal transmits the IP address of the own terminal from the optical signal transmission means to the server apparatus to the optical signal reception means, and the server apparatus receiving the IP address transmits the Internet communication Means to establish a line with the client terminal specified by the IP address.

  The third communication line establishment system and method of the present invention corresponding to a case where the communication line establishment process led by the server device is difficult is the server ID for identifying the terminal of the client terminal by the optical signal transmission means. A terminal that is transmitted to the optical signal receiving means of the apparatus, the client terminal makes a communication start request to the server apparatus using the wireless communication means, and the server apparatus is identified by the terminal ID received by the optical signal receiving means It responds only to the communication start request from.

  Furthermore, in the fourth communication line establishment system and method of the present invention intended to prevent a third party from intercepting the terminal ID of the client terminal transmitted as an optical signal, the client terminal generates dynamically The contact ID is transmitted from the optical signal transmitting means to the optical signal receiving means of the server device, and the server device receiving the contact ID transmits the contact ID to the client terminal using the wireless communication means, and the client terminal Establishes a wireless communication line with the server device that has transmitted the contact ID.

  Further, in the above communication line establishment processing, in the present invention, in particular, in order to make it possible to use a portable terminal having a color display as a client terminal of the system of the present invention, the color display is used as the optical signal transmission means, An image sensor is used as the optical signal receiving means, and a hue difference optical signal that transmits data using color blinking is used as the transmitted optical signal. Alternatively, a visual code that transmits data according to a predetermined geometric feature is used.

  As described above, the present invention is characterized by the following communication line establishment system, establishment method, program, and recording medium.

(Invention of the system)
(1) A communication line establishment system between a client terminal having an optical signal transmitting means and a wireless communication means, and a server apparatus having an optical signal receiving means and a wireless communication means,
The client terminal is provided with means for transmitting a terminal ID for identifying the own terminal from the optical signal transmitting means to the optical signal receiving means of the server device,
The server device includes means for receiving the terminal ID by the optical signal receiving means, and means for establishing a communication line with the client terminal specified by the terminal ID by the wireless communication means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means is provided for receiving the terminal ID by computing the generated hue difference and converting it into a data value .

(2) A communication line establishment system between a client terminal having an optical signal transmission means and an Internet communication means, and a server apparatus having an optical signal reception means and an Internet communication means,
The client terminal is provided with means for transmitting the IP address of its own terminal from the optical signal transmitting means to the optical signal receiving means of the server device,
The server device includes means for receiving the IP address by the optical signal receiving means, and means for establishing a communication line with the client terminal specified by the IP address by the Internet communication means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means is provided for receiving the IP address by computing the generated hue difference and converting it into a data value .

(3) A communication line establishment system between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal issues a communication start request to the server apparatus by means of transmitting a terminal ID identifying the terminal from the optical signal transmitting means to the optical signal receiving means of the server apparatus, and by the wireless communication means. Means,
The server device is provided with means for establishing a communication line in response to the communication start request from the client terminal specified by the terminal ID received by the optical signal receiving means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means is provided for receiving the terminal ID by computing the generated hue difference and converting it into a data value.

(4) A communication line establishment system between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal is provided with means for transmitting a dynamically generated contact ID from the optical signal transmitting means to the optical signal receiving means of the server device,
The server device includes means for receiving the contact ID by the optical signal receiving means, and means for transmitting the contact ID to the client terminal by the wireless communication means,
The client terminal is provided with means for establishing a communication line with the server device that has transmitted the contact ID by the wireless communication means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means is provided for receiving the contact ID by computing the generated hue difference and converting it into a data value .

(5) When the data value is an N-ary number, the hue difference is set to (N + 1) gradation .

(Invention of method)
( 6 ) A communication line establishment method between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal has a step of transmitting a terminal ID for identifying the terminal from the optical signal transmitting unit to the optical signal receiving unit of the server device,
The server device includes a step of receiving the terminal ID by the optical signal receiving unit, and a step of establishing a communication line with the client terminal specified by the terminal ID by the wireless communication unit,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. A step of receiving the terminal ID by performing arithmetic processing on the generated hue difference and converting it into a data value is provided.

( 7 ) A communication line establishment method between a client terminal comprising an optical signal transmitting means and an Internet communication means, and a server device comprising an optical signal receiving means and an Internet communication means,
The client terminal has a step of transmitting the IP address of the own terminal from the optical signal transmitting unit to the optical signal receiving unit of the server device,
The server device includes a step of receiving the IP address by the optical signal receiving unit, and a step of establishing a communication line with the client terminal specified by the IP address by the Internet communication unit,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. The method includes the step of receiving the IP address by performing arithmetic processing on the generated hue difference and converting it into a data value .

(8) A communication line establishment method between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal transmits a terminal ID for identifying its own terminal from the optical signal transmitting unit to the optical signal receiving unit of the server device, and makes a communication start request to the server device by the wireless communication unit. And having steps
The server device has a step of establishing a communication line in response to the communication start request from the client terminal specified by the terminal ID received by the optical signal receiving means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. A step of receiving the terminal ID by performing arithmetic processing on the generated hue difference and converting it into a data value is provided.

( 9 ) A method of establishing a communication line between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal has a step of transmitting a dynamically generated contact ID from the optical signal transmitting unit to the optical signal receiving unit of the server device;
The server device includes a step of receiving the contact ID by the optical signal receiving unit, and a step of transmitting the contact ID to the client terminal by the wireless communication unit,
The client terminal has a step of establishing a communication line with the server device that has transmitted the contact ID by the wireless communication means;
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. The method includes a step of receiving the contact ID by performing arithmetic processing on the generated hue difference and converting it into a data value .

( 10 ) When the data value is an N-ary number, the hue difference is set to (N + 1) gradation .

(Invention of the program)
( 11 ) A means or step in the communication line establishment system or establishment method described in any one of (1) to ( 10 ) above is configured to be executable by a computer.

(Invention of recording medium)
( 12 ) The computer records the program for causing the computer to execute the means or steps in the communication line establishment system or establishment method according to any one of (1) to ( 10 ) above. Features.

  According to the present invention, at the initial stage of establishment of a communication line, an optical signal with high directivity is transmitted to a communication destination device, and a communication interface (terminal ID) of the terminal is transmitted, so that a wireless communication device is provided around Even if an information device and an information terminal exist, a bidirectional communication line between the client terminal and the device designated by the user can be established accurately.

  Further, in the present invention, instead of transmitting a terminal ID as an optical signal used at the initial stage of establishing a communication line, a terminal ID is transmitted to a third party who intercepts the optical signal by transmitting a dynamically generated contact ID. Can be prevented from being known.

  Furthermore, in the present invention, a communication destination device can be specified more precisely by using a light source with higher directivity as the optical signal transmission means. Similarly, by using a visible light source as the optical signal transmission means, the user can visually recognize the device irradiated with the light, so that the communication destination device can be specified more accurately.

  In the present invention, the light signal can be transmitted without using a special light signal light source device in the client terminal by using a color blinking light signal (hue difference light signal) that can be transmitted from the color display. .

(1) Basic System for Establishing Communication Line The communication line establishment system and method of the present invention is for establishing a communication line using a predetermined radio wave between a client terminal and a server device located nearby. System and method. In particular, the present invention is effective when a plurality of server devices (information devices, information terminals) A to E exist near the client terminal X as shown in FIG.

  A configuration example of a communication line establishment system of the present invention is shown in FIG. In the figure, a client terminal 100 includes an optical signal transmission unit 101, a radio communication unit 102 using radio waves, various I / O (input / output) devices 103 such as a numeric keypad and a display device, and a controller (that is, a CPU) that controls these devices. (Central processing unit) and various software modules (operating on the CPU) 104. The client terminal 100 can use the configuration of a mobile phone, a PDA (Personal Data Assistant), a laptop PC, or the like provided with communication means as it is, and is particularly characterized by including an optical signal transmission means.

  On the other hand, the server apparatus 200 includes an optical signal receiving unit 201, a radio communication unit 202 using radio waves, various I / O (input / output) devices 203 such as a numeric keypad and a display unit, and processing such as establishment of a communication line by controlling them. What is necessary is just to have a controller (CPU (central processing unit) and various software modules operating on the CPU) 204 for performing the above. For example, the server apparatus 200 uses an apparatus provided with optical signal receiving means possessed by a PC, TV, AV equipment, information home appliance, street information terminal (street display, station shop terminal), etc., and communication means with a client terminal. can do.

  In the communication line establishment system of the present invention, first, the optical signal ID is transmitted from the optical signal transmitting means 101 of the client terminal 100 to the optical signal receiving means 201 of the server device 200. The transmission of the optical signal ID is realized as follows.

  As one example, an LED (Light Emitting Diode) or the like is used as the optical signal transmitting means 101, and a photodiode or an image sensor is used as the optical signal receiving means 201. In this case, infrared or visible light is transmitted from the LED, and data transmission can be realized by PPM (Pulse Position Modulation) or the like by blinking the light source. In the server device 200, the blinking pattern detected by the photodiode is converted into data and received. In addition, the transmission method defined by IrDA and the methods described in Non-Patent Document 2, Non-Patent Document 3, and Non-Patent Document 4 described below can be applied.

  In particular, a highly directional visible light source device such as a laser diode used for a laser pointer can be used as the optical signal transmitting means. In this case, the user can visually recognize the device irradiated with light and can precisely irradiate light at a predetermined point, so that the communication destination device can be more accurately specified from among a plurality of surrounding devices. .

  As another example for transmitting the optical signal ID, a display device of a client terminal is used as a light source. In this display device, a visual code for transmitting data with a specific geometric feature as described in Non-Patent Document 5 below is displayed, and this is provided as an optical signal receiving means in the server device. By reading with, ID can be transmitted.

  In addition, as shown in FIG. 2, the color display 105 can be used as an optical signal transmitting unit, the color image sensor 205 can be used as an optical signal receiving unit, and an ID can be transmitted using a color blinking optical signal (hue difference optical signal). .

Non-Patent Literature 2 “Nobuyuki Matsushita, Daisuke Hihara, Teruyuki Gohara, Shinichi Yoshimura, Junichi Kyokumoto,“ ID Cam: Smart Camera that can Acquire Scene and ID Simultaneously ”, Transactions of Information Processing Society of Japan, vol.43, No. 12, pp.3664-3674, Dec.2002. ''
Non-Patent Document 3 “DJ Moore, R. Want, et al.“ Implementing Phicons: Combining Computer Vision with Infrared Technology for Interactive Physical Icon ”, Proceedings of ACM UIST'99, Ashville, NC, November 8th-10th, pp. 67 -68,1999. ''
Non-patent document 4 “Atsushi Aoki,“ Infrared tag read by camera and its application ”, interactive system and software VIII, pp.131-136, Modern Science, 2000.”
Non-Patent Document 5 “Junichi Kyokumoto,“ Augmented Reality Construction Method Using Two-Dimensional Matrix Code ”, Interactive System and Software IV, pp.199-208, Modern Science, 1996.”
(2) Optical signal transmission method using color blinking optical signal (hue difference optical signal) The color blinking optical signal (hue difference optical signal) method is used as an optical signal transmission means for establishing a communication line in the present invention.

  As shown schematically in FIG. 11, the transmission side includes a transmission queue 10, a color blinking signal transmission unit 11, and a color display unit 12 such as a display. On the other hand, the receiving side has an image sensor means 20 such as a camera and a color blinking signal receiving means 21.

  The color blinking signal transmission unit 11 converts transmission data input to the transmission queue 10 from the upper unit on the transmission side into a color blinking signal, and uses the color display unit 12 to blink the color at a predetermined color blinking frequency f (Hz). Send a signal.

  The color blinking signal receiving means 21 processes image frames continuously input from the image sensor means 20 that images the color display means 12 at a frame rate of f (Hz) or higher, detects a signal receiving area, Receive values and output these values to the higher-level means on the receiving side. Hereinafter, an example of transmission / reception processing using the color blinking light signal (hue difference light signal) will be described.

(Transmission / reception processing example 1)
A transmission / reception processing example of the color blinking signal transmission unit will be described with reference to FIGS. 11 and 12. FIG. 12 is a flowchart showing the steps executed by the color blinking signal transmission means.

  The color blinking signal transmission means 11 performs arithmetic processing on the data value, converts it into a hue difference, and transmits it. Here, when the hue difference is used for N + 1 gradations, one N-ary data value can be transmitted with one hue difference value.

  In FIG. 12, N is (hue difference gradation) -1, f is a color blinking frequency (Hz), h is an initial value of hue, l is a specified value of lightness, and s is a specified value of yield. Represents. The same applies to FIGS. 13, 14 and 18.

  The color blinking signal transmission unit 11 receives the color of hue H = h, lightness L = 1, and saturation S = s until the transmission data is input to the transmission queue 10 and the transmission process is started. While being displayed, the hue H of the currently displayed color is input to the variable ch (s201).

  If transmission data exists in the transmission queue 10, the process proceeds to a data value transmission process (s202). Arbitrary transmission data is managed in the transmission queue 10 as an N-ary number sequence. That is, one data value is an integer value n of 0 or more and less than N.

  In the transmission process, first, the data value n is acquired from the transmission queue 10, and the transmission queue 10 is updated (s203).

  Next, the data value n is converted into a hue difference dh (s204). Here, dh = (n + 1) × 2π / (N + 1). As a result, the next display color is determined to be a color of hue H = ch + dh, lightness L, and saturation S (s205). Since the hue H is a value of 0 or more and less than 2π, if ch + dh> 2π, H = ch + dh−2π.

  Then, the determined display color (color of hue H, lightness L, and saturation S) is displayed on the color display means 12 (s206).

  If the blinking frequency is fHz, the display color is kept present for a period of (1000 / f) msec (S207).

  Thereafter, the hue H of the current display color is substituted for the variable ch, and the process returns to the step of s202 (s208). Note that the rest time in s207 is (1000 / f) msec when it is assumed that steps other than s207 are completed at 0 msec. However, if processing time of t msec is required in steps other than s207, (1000 / f) t msec.

  If there is no transmission data in the transmission queue in s202, the data transmission is completed (s209).

  Next, a transmission / reception processing example of the color blinking signal receiving unit will be described with reference to FIGS. 11, 13 and 14. FIG. 13 is a flowchart showing the steps executed by the color blinking signal receiving means. FIG. 14 is a flowchart showing the process of s303 shown in FIG. Here, an example of transmission / reception processing when receiving N-ary data values one by one will be described.

  When the start signal is received (s300), the color blinking signal receiving unit 21 continuously acquires the image frames I (i) from the image sensor unit 20 (s301). Here, in the process shown in FIG. 13, the image frame acquisition cycle (= frame rate) is assumed to be equal to the blinking frequency of the color display means 12 on the transmission side.

  The color blinking signal receiving unit 21 holds the previous image frame I (i−1) at the time when the latest image frame I (i) is acquired. The process shown in FIG. 13 is performed every acquisition event (s301) of the latest image frame I (i).

  When the image frame I (i) is acquired, the hue difference dh (x, y) [x, y is 0 ≦ x <for each pixel of the image frames I (i−1) and I (i). WIDTH, 0 ≦ y <HEIGHT. WIDTH represents the number of pixels on the horizontal axis of the image frame, and HEIGHT represents the number of pixels on the vertical axis of the image frame (the same applies to FIG. 18). ] Is calculated (S302). Here, when calculating the hue difference, a pixel with low saturation, that is, an almost colorless pixel cannot be regarded as an image of a color blinking signal. Therefore, the hue difference is calculated only when the saturation of the colors of both pixels to be compared is larger than the predetermined value, and otherwise, the hue difference can be set to zero.

  Next, the hue difference dh (x, y) calculated for each pixel is converted into a data value a (x, y). However, if the hue difference cannot be converted into a data value, −1 (no data) is substituted for a (x, y) (S303).

  Specifically, as shown in FIG. 14, for an integer n where −1 ≦ n <N, hue ((n + 1) × 2π / (N + 1)) − R and hue ((n + 1) × 2π / (N + 1)) It is detected whether or not the calculated hue difference dh (x, y) falls within a narrow angle formed by + R on the color plane (S400). Note that R is an error allowed for the hue (value).

  FIG. 15 and FIG. 16 show the narrow angle formed by the hue ((n + 1) × 2π / (N + 1)) − R and the hue ((n + 1) × 2π / (N + 1)) + R on the color plane, respectively. The case where the hue difference dh (x, y) enters (FIG. 15) and the case where it does not (FIG. 16) are shown. In the above description and drawings, R is a constant value, but the value of the allowable error R can be changed by the value of hue ((n + 1) × 2π / (N + 1)). In general, the color development performance of the light source and the color sensitivity of the image sensor means 20 have characteristics, and the tolerance R is made variable in consideration of this characteristic (for example, near the red color where the color sensitivity of the image sensor means 12 is strong). It is considered that the reduction of the allowable error R) contributes to the improvement of the detection accuracy of the color blinking signal.

  Here, if dh (x, y) enters a narrow angle formed by the hue ((n + 1) × 2π / (n + 1)) − R and the hue ((n + 1) × 2π / (N + 1)) + R on the color plane, A (x, y) is determined (s401).

  For all integers n where −1 ≦ n <N, hue ((n + 1) × 2π / (n + 1) −R and hue ((n + 1) × 2π / (n + 1))) + R have a narrow angle dh on the color plane. If (x, y) does not enter, there is no corresponding data value, so a (x, y) = − 1 is set (s402).

  That is, the range in which the hue difference dh (x, y) is converted into the data value 0, the data value 1, and the no data (−1) on the color plane when N = 2 by the process shown in FIG. FIG. 17 shows the result. In FIG. 17, even when there is no corresponding data value, dh (x, y) is converted to no data (−1).

  After a (x, y) is calculated for all pixels, the signal component E (n) is extracted (s304). The signal component E (n) is a connected component of pixel coordinates where a (x, y) = n (n is an integer satisfying 0 ≦ n <N), and has the largest number of pixels. In the process shown in FIG. 13, E (n) is detected for all integers n where 0 ≦ n <N, which is a possible value of the received data value. When a (x, y) is calculated in the processing in the loop 2, only the value that appears as an element of a (x, y) may be performed.

  When the signal component E (n) is detected, it is detected whether or not the number of pixels included in E (n) is larger than the predetermined value TA (s305). The predetermined value TA represents a threshold value for the number of pixels for determining a signal component as a signal reception area. Setting the value of TA to a value greater than or equal to 0 adds a condition that a signal component is regarded as a significant signal only when the signal component is detected as a set of pixels having a group size greater than or equal to TA. This reduces the possibility of erroneously detecting a hue difference that occurs locally by chance as a data signal. If TA = 0, when a signal component is detected, it is determined as a signal reception area.

  When the number of pixels included in E (n) is larger than the predetermined value TA, the color blinking signal receiving means 21 outputs E (n) as a signal receiving area and n as a received data value to the receiving high-order means ( s306). For the signal receiving area, instead of the coordinate set of the area, information on a rectangular area surrounding the area can be output, and the barycentric coordinates of the rectangle can be output.

  On the other hand, if E (n) is not detected for all integers n where 0 ≦ n <N, or if it is detected but the number of pixels is equal to or less than TA, the image frame I (i) is received by acquisition. It is assumed that there is no data that has been processed (s307). Thereafter, the image frame number i = i + 1 is set, and the process proceeds to the next image frame.

(Transmission / reception processing example 2)
The transmission / reception processing described in the transmission / reception processing example 1 is a case where data values are received one by one. This example is a basic operation of the data transmitting / receiving apparatus. However, in order to be able to receive a signal due to slow color blinking, a mechanism for receiving the received data value sequence as valid received data by receiving data values continuously for a certain number of times is necessary. is there. That is, it is possible to identify and receive a low-speed color blinking signal as a significant data signal by detecting pixels whose hue changes at a certain rate or more continuously for a predetermined number of times.

  In the following, a process will be described that is based on the transmission / reception processing example 1 and modified so that the received data value sequence is accepted as valid received data by continuously receiving data values a predetermined number of times or more.

  The operation algorithm of the color blinking signal transmission means 11 on the transmission side is the same as that described with reference to FIG. However, when the continuous signal length is K, the transmission data input to the transmission queue 10 is a data value string composed of K data values in N-ary. Alternatively, the transmission data is a data value sequence composed of multiple data values of K.

  FIG. 18 shows an example of the operation algorithm of the color blinking signal receiving means 21 in this case. The color blinking signal receiving unit 21 continuously acquires the image frames I (i) from the image sensor unit 20. Again, the image frame acquisition cycle (= frame rate) is assumed to be equal to the blinking frequency of the color display means 12 on the transmission side. The continuous signal length is K, and the received data value sequence is determined as valid received data by continuously receiving data values K times.

  The color blinking signal receiving means 21 sets all values of the array c (x, y) for holding how many times the data value is continuously received in each pixel as 0 as preprocessing (s801). The subsequent processing, s802, s803, s804, and s813 are the same as s301, s302, s303, and s308 described with reference to FIG.

In loop 1 and loop 2, after the value of a (x, y) is determined by s804, a (x, y)! It is confirmed whether or not = -1 (no data) (S805).
And a (x, y)! == 1, that is, when it is considered that a color blinking signal including a data value is received at the pixel at the coordinate (x, y), d (x, y, c (x, y)) The received data value a (x, y) is substituted and held (S806).
The array d is an array for holding continuously received data values at each pixel coordinate. Next, c (x, y) = c (x, y) +1 is set (S807).

  On the other hand, a (x, y)! When it is not = −1, that is, when a color blinking signal including a data value is not received at the pixel at the coordinate (x, y), c (x, y) = 0 is set (S808).

  After a (x, y), c (x, y), and d (x, y, c (x, y)) are calculated for all pixels, the continuous signal component CE is detected (s809). The continuous signal component CE is c (x, y) = K, and d (x, y, 0), d (x, y, 1), ..., d (x, y, K-1). Are connected components of pixel coordinates (x, y) that all match, and have the largest number of pixels. That is, in s809, the largest connected component of the pixels that simultaneously received the data value sequence composed of K data values is extracted as a continuous signal component.

  If the continuous signal component CE is detected in s809, it is detected whether the number of pixels of the continuous signal component CE is greater than TA (s810). Here, TA is a threshold value of the number of pixels for determining the continuous signal component CE as a signal reception area. That is, setting TA to a value equal to or greater than 0 adds a condition that a continuous signal component is regarded as a significant signal only when a continuous pixel component is detected as a set of pixels having a size equal to or greater than TA. As a result, the possibility of erroneously detecting a hue difference that occurs “continuously” locally and accidentally as a data signal is reduced. If TA = 0, when a continuous signal component is detected, it is determined as a signal reception area.

  When the number of pixels of the continuous signal component CE is larger than TA, CE is set as a signal reception area, arbitrary pixel coordinates (x, y) in the CE are selected, and a (x, y, 0), d (x, y, 1),..., d (x, y, K−1) are output to the higher-level means as a received data value sequence (s810). Then, all values of the array c (x, y) are set to 0 again (s812), and the process proceeds to s813. For the signal receiving area, instead of the coordinate set of the area, information on a rectangular area surrounding the area can be output, and the barycentric coordinates of the rectangle can be output.

  On the other hand, when the number of pixels of the continuous signal component CE is equal to or less than TA, all values of the array c (x, y) are simply set to 0 (s812), and the process proceeds to s813. If the continuous signal component CE is not detected in s809, the process proceeds to s813.

  Thereafter, the image frame number i = i + 1 is set (s813), and the process proceeds to the next image frame.

(Transmission / reception processing example 3)
In the transmission / reception processing of the transmission / reception processing example 2, the receiving side can receive a data value sequence consisting of multiple data values of the continuous signal length K. By combining the processing methods shown in the transmission / reception processing example 1 and the transmission / reception processing example 2, Thus, it becomes possible to receive a data value sequence composed of data values having an arbitrary length that is equal to or longer than the continuous signal length K.

  Also in this case, the operation algorithm of the color blinking signal transmission unit 11 on the transmission side is the same as that described in FIG. However, when the continuous signal length is K, the transmission data input to the transmission queue 10 is a data value sequence composed of K or more N-ary data values.

  The color blinking signal receiving means 21 on the receiving side first operates based on the algorithm described with reference to FIG. After the significant continuous signal component is detected (s810) and the signal reception area and the received data value sequence are output (s811), the pixel coordinates included in the signal reception area have been described with reference to FIG. The operation algorithm is applied, and the sequentially received data value is output to the host means. However, when there is no reception data at the pixel coordinates included in the signal reception area (s307) and reception of the data value is interrupted, the process immediately transitions to the operation algorithm described with reference to FIG. Thereafter, the above-described operation is performed each time a significant continuous signal component is detected.

  Further, the data signal transmission method and the data signal reception method described above can be implemented in various ways other than the transmission / reception processing example described above.

  In the transmission / reception processing examples described above, it is assumed that the program is implemented as a single task processing system program. However, in a system capable of multitask processing and parallel processing, implementation suitable for the processing system may be performed. . For example, in the system capable of parallel processing, the processing at each pixel coordinate performed by loop 1 and loop 2 in the operation algorithm described with reference to FIG. 12 and FIG. May be implemented.

  In the transmission / reception processing example described above, the acquisition period (= frame rate) of the image frame of the camera connected to the color blinking signal receiving unit 21 is equal to the blinking frequency of the color display unit 12 on the transmission side. When the frame rate is higher than the blinking frequency of the color display means 12 on the transmission side, an operation algorithm considering this point can be used.

  For example, a process based on the operation algorithm described with reference to FIGS. 12 and 18 can be used. In the operation algorithm of FIGS. 12 and 18, an image frame that satisfies the following condition is added to the image frame I (i−1) that is a target of calculation of the hue difference for each pixel of the most recently acquired image frame I (i). Use. That is, assuming that the time point when the image frame I (i) is imaged is T, all the image frames imaged at the time point t where T−1000 / f ≦ t <T are regarded as the image frame I (i−1). Furthermore, while comparing the color of each pixel between the plurality of image frames I (i−1) and the image frame I (i), the pixel coordinates (x, y) and the data value a that are considered to have received the data value. Calculate (x, y).

  According to the optical signal transmission method using the hue difference optical signal described above, a color LCD (Liquid Crystal Display) provided in a normal mobile terminal and an image sensor having a video frame rate (30 fps) imaging capability can be used. ID can be transmitted robustly.

  In FIG. 13 showing a configuration example of a client terminal and a server apparatus using this optical signal transmission method, the color display 105 provided as one of the I / O devices is used as it is as an optical signal transmission means in the client terminal 100. Therefore, it is not necessary to add a special optical signal transmission device such as an LED to the client terminal.

(3) Embodiment An embodiment of the communication line establishment system and method of the present invention using the optical signal transmission method by the color blinking optical signal (hue difference optical signal) will be described.

(Embodiment 1)
In the present embodiment, in the configuration of FIG. 1 or FIG. 2, the server apparatus 200 that has received the optical signal from the client terminal 100 takes the lead in establishing a radio wave communication line. A general procedure in this case is shown in FIG.

  (S1) First, the terminal ID is transmitted from the client terminal using the optical signal transmission means. The terminal ID is a physical communication interface ID in predetermined radio wave communication used for communication thereafter. In an IEEE 802 wireless LAN, a MAC address corresponds to this, and in Bluetooth, a device ID corresponding to this is assigned to each terminal.

  (S2) The server device that has received the optical signal terminal ID by the optical signal receiving means transmits a communication start request to the client terminal of the terminal ID. At this time, the client terminal side is notified of the communication interface ID (hereinafter referred to as “server ID”) of the server device that is the transmission source of the communication start request.

  (S3) The client terminal returns an ACK (reception confirmation) to the server device specified by the server ID.

  (S4) Upon receiving the ACK, the server device transmits various information necessary for establishing a bidirectional communication line to the client terminal. At this time, for example, time information inside the apparatus and a wireless channel ID to be used are transmitted.

  (S5) The client terminal that has received the information such as the channel ID returns an ACK to the server device, whereby a bidirectional wireless communication line is established between them and bidirectional data communication is started.

  Next, as a more specific embodiment, an operation when Bluetooth is used as a wireless communication unit will be described.

  For communication between Bluetooth devices, either one becomes the master and the other becomes the slave. Initially, all devices are in a standby “standby” state, and when the system is set as a master, the master performs an “inquiry” operation to search for surrounding devices. Other devices that have recognized this send their ID information to the master, and the master divides it into an “Active Member” that allows immediate data communication and a “Parked Member” that does not require communication for the time being. sign up. Then, the master designates a specific slave by the “page” mode which means the start of communication. The slave that has received this notification informs the master that the data has been received, and the master that has received this notification will know which channel the data will be exchanged in the future, when it is time, and when to start the next communication. Is sent in a packet. The slave that has received this notifies the master. After this, both communication can be started. This state is called “Connect” mode.

  As shown in the communication line establishment procedure when Bluetooth is used as the wireless communication means in FIG. 4, first, in a state where both the client and the server are in the “standby” state, the terminal ID ( Bluetooth communication interface ID) is transmitted (S11). The server apparatus that has received the information stores the ID, performs master setting, and performs an “inquiry” operation (S12, S13). As a result, a plurality of terminal IDs are received from surrounding Bluetooth devices. At this time, the server apparatus determines the device having the terminal ID already received as the optical signal as the communication destination slave, performs “Page” (communication start request), and establishes the Bluetooth connection by the predetermined procedure described above (S14). To S17).

  Next, as another specific embodiment, an operation when establishing a communication line via the Internet will be described.

  The system configuration in this case is shown in FIG. The client terminal 100 is already connected to the Internet using the Internet communication means 106 such as a wireless LAN or a cellular phone packet communication line. The server device 200 is also connected to the Internet by wired / wireless communication means (not shown). As shown in FIG. 6, the configuration of the client terminal and the server apparatus in this system configuration includes Internet communication means 206 instead of wireless communication means. The Internet communication means is configured by a software module that is provided in a PC or a portable terminal and processes a communication protocol for Internet communication with a predetermined wired / wireless data communication device.

  The role of the communication line establishment method here is to establish a TCP (Transmission Control Protocol) connection for bidirectional IP packet communication between the client terminal and the server device. The procedure of this process is shown in FIG.

  (S21) First, the client terminal 100 transmits the IP address of the client terminal using the optical signal transmission means 101.

  (S22 to S24) When the server apparatus 200 receives the IP address by the optical signal receiving unit 201, the server apparatus 200 uses this as a trigger to establish a TCP connection with the terminal having the IP address. That is, a TCP connection is established by transmitting SYN (connection request) to the terminal specified by the IP address, receiving ACK and SYN from the terminal, and returning ACK to the terminal.

(Embodiment 2)
In this embodiment, a client terminal takes the lead in establishing a radio wave communication line. A general procedure in this case is shown in FIG.

  (S31) First, the client terminal transmits a terminal ID to a specific server device.

  (S32) Next, the client terminal transmits a communication start request including the terminal ID to surrounding devices.

  (S33) In the server device that has received the communication start request, it is confirmed whether or not the terminal ID included in the communication start request has been received as an optical signal within a predetermined time, and matches the terminal ID received as the optical signal. ACK including the server ID is returned only to the communication start request including the terminal ID to be transmitted.

  (S34, S35) The client terminal transmits various information (time information, wireless communication channel ID, etc.) necessary for communication start to the server apparatus that has returned ACK (server ID), and after receiving ACK for the information, Establish a two-way wireless communication line.

  In the present embodiment, in particular, when using Bluetooth as a wireless communication line, the client terminal is set as a master after performing an optical signal transmission, and performs an “inquiry” operation. On the other hand, the surrounding server apparatus returns its own ID only for the “inquiry” operation from the device having the terminal ID received within a certain time as an optical signal. As a result, the client terminal receives the ID only from the specific server device that transmitted the optical signal, and thus establishes a Bluetooth communication line with the device having the ID as the communication destination slave.

(Embodiment 3)
In establishing a communication line according to the present embodiment, instead of transmitting a terminal ID as an optical signal, a contact ID generated dynamically is transmitted first, and the terminal ID is known to a third party who intercepts the optical signal. Improve to prevent it. Here, the contact ID may be a value randomly generated by the client terminal when the communication line is established. An example of the operation in this case is shown in FIG.

  (S41) First, the client terminal transmits the contact ID to a specific server device using the optical signal transmission means.

  (S42) Next, the client terminal transmits a signal for inquiring surrounding server devices via the wireless communication means.

  (S43) Upon receiving the inquiry signal, the server device returns its own server ID and the contact ID received by the optical signal receiving means.

  (S44 to S47) The client terminal determines the server device that has returned the contact ID transmitted as an optical signal as a communication destination, transmits a communication start request to the server device, and performs a predetermined procedure to communicate with the server device. Establish a two-way wireless communication line.

  The procedure shown in FIG. 9 can be changed as follows. First, the client terminal transmits the contact ID to a specific server device using the optical signal transmission means. The server apparatus that has received the contact ID by the optical signal receiving means transmits its own server ID and the contact ID received by the optical signal receiving means to surrounding devices. The client terminal determines the server device that has transmitted the contact ID transmitted as an optical signal as a communication destination, and thereafter establishes a bidirectional wireless communication line between the client terminal and the server device through a predetermined procedure.

  In addition, the method shown in FIGS. 3 and 4 or the method shown in FIGS. 1 and 2 or the like on a mobile phone, PDA, PC or other information device or information terminal equipped with hardware means necessary for the above-described embodiments. A part or all of the processing functions of the apparatus shown can be implemented as a program and realized using a computer, or the processing procedures shown in FIGS. 1 to 9 can be configured as a program and executed by a computer. In addition, a computer-readable recording medium such as a flexible disk, MO, ROM, or memory card can be used to store a program for realizing the processing function of each unit by the computer or a program for causing the computer to execute the processing procedure. It can be recorded on a CD, a DVD, a removable disk, etc., stored, provided, and distributed via a communication network such as the Internet.

  The following can be assumed to utilize the communication line establishment system and method of the present invention. In recent years, portable terminals equipped with radio communication devices using radio waves such as Bluetooth have become widespread. At the same time, there is an increasing number of information devices that communicate with the portable terminal and are controlled by the portable terminal in a room or public space.

  For example, there is a system in which content displayed on a street display installed in a public space is operated by a mobile phone. In such a system, contents on the street display can be selected by operating a button on the mobile phone and related information can be acquired in the mobile phone, or user registration or ticket reservation can be performed by inputting predetermined information. It is possible.

  INDUSTRIAL APPLICABILITY The present invention can be applied as a communication line establishment method for realizing interactive operation via a radio wave communication line such as Bluetooth by a user selecting one from many street displays around the user. In the IrDA method, a button is operated on a terminal while establishing a line within 1 m from a street display to be operated and maintaining the optical axis for communication not being shifted or blocked. It is necessary and the convenience is bad. If the wireless communication is based on Bluetooth, it is possible to communicate with a device separated by about 10 m, and the above problem caused by the characteristics of infrared (light) communication is also solved.

  The present invention that has solved the problem at the time of establishing a communication line in radio wave radio communication such as Bluetooth is a communication between a specific one of a plurality of communication devices existing within a distance of about 10 m from a user and a terminal held by the user. This is an effective method for establishing a line accurately. For example, the distance between the large street display and the user who views the large street display is 4.5 m or more. According to the present invention, a Bluetooth connection between the large street display and the user terminal can be accurately established under such circumstances. Therefore, after establishing a connection using an optical signal as a trigger, a cursor corresponding to the user terminal is displayed on the large display, and the cursor is controlled using a cross key on the user terminal to perform various operations on the content on the display. An execution system can be realized.

  In addition, since many mobile phones already have an infrared light emitting device and a color display, the present invention can be applied only by installing necessary software without adding a new device. Therefore, the present invention can be widely used as a radio wave communication line establishment system and method for a mobile phone or other portable device and an information device existing in the vicinity of the user.

2 shows a configuration example (part 1) of a client terminal and a server device of a communication line establishment system according to the present invention. 2 shows a configuration example (part 2) of a client terminal and a server device of a communication line establishment system according to the present invention. 6 is an example of a server-driven communication line establishment procedure according to the present invention. The example of the Bluetooth communication line establishment procedure by this invention. 1 is an overall configuration example of an Internet communication line establishment system according to the present invention. Configuration example (part 3) of the client terminal and server device of the Internet communication line establishment system according to the present invention. An example of an Internet communication line establishment procedure according to the present invention. 6 is an example of a client-driven communication line establishment procedure according to the present invention. The example of the communication line establishment procedure using contact ID by this invention. FIG. 5 shows an example of application of the communication line establishment system and method according to the present invention. FIG. Schematic of the color blinking signal (hue difference light signal) transmission method in the present invention. The flowchart which showed the process which the color blink signal transmission means in FIG. 11 performs. The flowchart which showed the process which the color blink signal receiving means in FIG. 11 performs. The flowchart which showed the process of s303 in FIG. The figure which shows the case where the hue difference dh (x, y) enters in the narrow angle which hue makes on a color plane, and this. The figure which shows the case where the hue difference dh (x, y) does not enter into the narrow angle which hue makes on a color plane, and this. Explanatory drawing which shows the relationship on the color plane of hue difference dh (x, y) and a data value. The flowchart which showed the process which a color blink signal receiving means performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Client terminal 200 Server apparatus 101 Optical signal transmission means 102 Wireless communication means 103 I / O device 104 Controller 105 Color display 106 Internet communication means 201 Optical signal reception means 202 Wireless communication means 203 I / O device 204 Controller 205 Color image sensor 206 Internet communication means

Claims (12)

A communication line establishment system between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal is provided with means for transmitting a terminal ID for identifying the own terminal from the optical signal transmitting means to the optical signal receiving means of the server device,
The server device includes means for receiving the terminal ID by the optical signal receiving means, and means for establishing a communication line with the client terminal specified by the terminal ID by the wireless communication means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means for receiving the terminal ID by calculating and converting the generated hue difference into a data value;
A communication line establishment system characterized by this. A communication line establishment system between a client terminal having an optical signal transmission means and an Internet communication means, and a server apparatus having an optical signal reception means and an Internet communication means,
The client terminal is provided with means for transmitting the IP address of its own terminal from the optical signal transmitting means to the optical signal receiving means of the server device,
The server device includes means for receiving the IP address by the optical signal receiving means, and means for establishing a communication line with the client terminal specified by the IP address by the Internet communication means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means for receiving the IP address by computing the resulting hue difference and converting it to a data value;
A communication line establishment system characterized by this. A communication line establishment system between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal issues a communication start request to the server apparatus by means of transmitting a terminal ID identifying the terminal from the optical signal transmitting means to the optical signal receiving means of the server apparatus, and by the wireless communication means. Means,
The server device is provided with means for establishing a communication line in response to the communication start request from the client terminal specified by the terminal ID received by the optical signal receiving means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means for receiving the terminal ID by calculating and converting the generated hue difference into a data value;
A communication line establishment system characterized by this. A communication line establishment system between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal is provided with means for transmitting a dynamically generated contact ID from the optical signal transmitting means to the optical signal receiving means of the server device,
The server device includes means for receiving the contact ID by the optical signal receiving means, and means for transmitting the contact ID to the client terminal by the wireless communication means,
The client terminal is provided with means for establishing a communication line with the server device that has transmitted the contact ID by the wireless communication means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Means for receiving the contact ID by performing arithmetic processing on the generated hue difference and converting it into a data value;
A communication line establishment system characterized by this.   The communication line establishment system according to any one of claims 1 to 4, wherein when the data value is an N-ary number, the hue difference is set to (N + 1) gradation. A communication line establishment method between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal has a step of transmitting a terminal ID for identifying the terminal from the optical signal transmitting unit to the optical signal receiving unit of the server device,
The server device includes a step of receiving the terminal ID by the optical signal receiving unit, and a step of establishing a communication line with the client terminal specified by the terminal ID by the wireless communication unit,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Receiving the terminal ID by computing the generated hue difference and converting it to a data value;
A communication line establishment method characterized by the above. A communication terminal establishment method between a client terminal comprising an optical signal transmitting means and an Internet communication means, and a server device comprising an optical signal receiving means and an Internet communication means,
The client terminal has a step of transmitting the IP address of the own terminal from the optical signal transmitting unit to the optical signal receiving unit of the server device,
The server device includes a step of receiving the IP address by the optical signal receiving unit, and a step of establishing a communication line with the client terminal specified by the IP address by the Internet communication unit,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Receiving the IP address by computing and converting the resulting hue difference into a data value;
A communication line establishment method characterized by the above. A communication line establishment method between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal transmits a terminal ID for identifying its own terminal from the optical signal transmitting unit to the optical signal receiving unit of the server device, and makes a communication start request to the server device by the wireless communication unit. And having steps
The server device has a step of establishing a communication line in response to the communication start request from the client terminal specified by the terminal ID received by the optical signal receiving means,
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Receiving the terminal ID by computing the generated hue difference and converting it to a data value;
A communication line establishment method characterized by the above. A communication line establishment method between a client terminal comprising an optical signal transmitting means and a wireless communication means, and a server device comprising an optical signal receiving means and a wireless communication means,
The client terminal has a step of transmitting a dynamically generated contact ID from the optical signal transmitting unit to the optical signal receiving unit of the server device;
The server device includes a step of receiving the contact ID by the optical signal receiving unit, and a step of transmitting the contact ID to the client terminal by the wireless communication unit,
The client terminal has a step of establishing a communication line with the server device that has transmitted the contact ID by the wireless communication means;
The optical signal transmitting means is a color display, the optical signal receiving means is a color image sensor, the optical signal transmitted by the optical signal transmitting means is a hue difference optical signal that transmits data using color blinking, and the light After the signal receiving means calculates the hue difference of each pixel between image frames continuously captured by the color image sensor, the pixel in which the hue difference equal to or greater than a certain value is extracted as a signal component. Receiving the contact ID by computing the resulting hue difference and converting it to a data value;
A communication line establishment method characterized by the above.   10. The communication line establishment method according to claim 6, wherein when the data value is an N-ary number, the hue difference is set to (N + 1) gradation.   A program characterized in that a means or step in the communication line establishment system or establishment method according to any one of claims 1 to 10 is configured to be executable by a computer.   A recording medium in which a program for causing a computer to execute means or steps in the communication line establishment system or establishment method according to any one of claims 1 to 10 is recorded so as to be readable by the computer.

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