JP2016024576A - Transmitter and information transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmitter and an information transmission method capable of securing information transmission to a receiver unit having low reading capacity of a two-dimensional code, and transmitting more pieces of information to a receiver unit having high reading capacity of the two-dimensional code.SOLUTION: A transmitter of the invention is configured so that a display time of a two-dimensional code of information to be transmitted to all receiver units, is a time when a receiver unit having low reading capacity of the two-dimensional code can read the two-dimensional code, and the display time of the two-dimensional code of information to be transmitted to a receiver unit having high reading capacity of the two-dimensional code is set according to the reading capacity of the receiver unit.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transmitting apparatus that transmits information to a receiving apparatus using a two-dimensional code and an information transmission method thereof.

  There is a method that can transmit a large amount of data by changing the two-dimensional code output from the transmission device every time and transmitting a plurality of two-dimensional codes, compared to reading a two-dimensional code printed on paper or the like. It has been proposed (see, for example, Patent Document 1).

JP 2007-166526 A

  As means for transmitting more data with the transmission device disclosed in Patent Document 1, there is a method of changing a two-dimensional code at a higher speed. However, these two-dimensional code reading devices can be read by products that are generally sold, such as mobile phone cameras, tablet PC cameras, and digital cameras. This is desirable because more users can use it.

  On the other hand, even when the same method is used for reading devices mounted on a plurality of types of products, generally there are variations in performance (scanning speed, resolution, analysis ability, etc.). In such a situation, when information or the like is distributed using a two-dimensional code that changes in time as described in Patent Document 1, the transmission side can read the two-dimensional code even with a low-capacity camera (reading device). Need to be considered.

  In particular, when an element such as a CCD is used, the readout time required for image reading is related to the output (projection) time of the two-dimensional code output from the transmission side. For example, there is a possibility that a two-dimensional code that changes at a certain time interval can be read by a receiving device having a high scanning performance, but cannot be read by a receiving device having a low scanning performance because it cannot follow the changing speed of the two-dimensional code. That is, in order for the receiving device to receive information correctly, the transmitting side needs to set the two-dimensional code change interval according to the target receiving device that has the slowest readout time. . For this reason, there has been a problem that more two-dimensional code information cannot be transmitted to a receiving apparatus having a short scanning time (high performance).

  Therefore, in order to solve the above problems, the present invention transmits more information to a receiving device having a high two-dimensional code reading capability while ensuring information transmission to the receiving device having a low two-dimensional code reading capability. An object of the present invention is to provide a transmitting device and an information transmission method thereof.

  In order to solve the above-described problem, the transmission device and the information transmission method thereof according to the present invention transmit dynamic two-dimensional code information corresponding to the reading time of the reception device.

Specifically, the transmission device according to the present invention is a transmission device that transmits the information to a reception device that reads information converted into the two-dimensional code by photographing the two-dimensional code,
Code conversion means for converting information into a two-dimensional code;
Display means for displaying the two-dimensional code converted by the code conversion means on a screen photographed by the receiving device;
A control means for causing the display means to display a plurality of two-dimensional codes converted by the code conversion means on the display means in a time-sharing manner with a display time corresponding to the two-dimensional code reading capability of the receiving device;
Is provided.

Specifically, the information transmission method according to the present invention is an information transmission method of a transmission device that transmits the information to a reception device that reads the information converted into the two-dimensional code by photographing the two-dimensional code. ,
A code conversion procedure for converting information into a two-dimensional code;
A display procedure for displaying the two-dimensional code converted by the code conversion procedure on a screen photographed by the receiving device;
A control procedure in which a plurality of two-dimensional codes converted by the code conversion procedure are displayed on the display means in a time-sharing manner with a display time corresponding to the two-dimensional code reading capability of the receiving device;
Is provided.

  According to the present invention, the display time of the two-dimensional code of information to be transmitted to all receiving devices is set to a time that can be read by a receiving device having a low two-dimensional code reading capability. The display time of the two-dimensional code is a time corresponding to the reading capability of the receiving device.

  Therefore, the present invention provides a transmitting apparatus and information transmission method capable of transmitting more information to a receiving apparatus having a high two-dimensional code reading capability while ensuring information transmission to a receiving apparatus having a low two-dimensional code reading capability. Can be provided.

The control means of the transmission device according to the present invention includes:
The display time of the two-dimensional code addressed to all devices converted from information that can be read by all of the receiving devices is the two-dimensional code including the two-dimensional code addressed to all the devices. When the code is photographed per unit time and the superimposed two-dimensional code is read, the superimposed two-dimensional code is set to a time that can be identified as the two-dimensional code addressed to all devices.

  When the two-dimensional code is displayed in a time-sharing manner, a receiving device having a low two-dimensional code reading capability acquires an image (superimposed two-dimensional code) on which a plurality of two-dimensional codes are superimposed. Only the information of the two-dimensional code addressed to all devices needs to be transmitted to a receiving device having a low two-dimensional code reading capability. Will do. For this reason, the display time of the two-dimensional code addressed to all devices and the display time of the other two-dimensional code are set so that the other two-dimensional code can be removed as noise by a receiving device having a low two-dimensional code reading capability. If the display time is set in this way, a receiving device having a low two-dimensional code reading capability can receive a superimposed two-dimensional code as a two-dimensional code addressed to all devices. The two-dimensional code can be received.

The control means of the transmission device according to the present invention includes:
It is possible to avoid displaying another two-dimensional code in which a code part is arranged in a background portion around the code part of the two-dimensional code addressed to all devices in the same unit time as the two-dimensional code addressed to all devices. And

  When a receiving device having a low two-dimensional code reading capability acquires a superimposed two-dimensional code, there is a background portion around a code portion having a two-dimensional code addressed to all devices, and a code of another two-dimensional code in the background portion. When the portions overlap, the contrast between the code portion of the two-dimensional code addressed to all devices and the background portion decreases. When the contrast is lowered, a receiving device having a low two-dimensional code reading capability cannot accurately read the two-dimensional code addressed to all devices and acquires erroneous information. For this reason, in the present invention, when a background part exists around the code part of the two-dimensional code addressed to all devices, the background part is used as another two-dimensional code that is time-divisionally displayed together with the two-dimensional code addressed to all devices per unit time. Select a code that does not overlap the code part. According to the present invention, a two-dimensional code addressed to all devices can be accurately read by a receiving device having a low two-dimensional code reading capability.

  The transmission device according to the present invention further includes color conversion means for switching the color of the code part of the two-dimensional code addressed to all devices and multiplexing other information on the information of the two-dimensional code addressed to all devices.

  The information transmission method according to the present invention further includes a color conversion procedure for switching the color of the code part of the two-dimensional code addressed to all devices and multiplexing other information on the information of the two-dimensional code addressed to all devices.

  According to the present invention, the color of the code part of the two-dimensional code addressed to all apparatuses can be switched every predetermined time. By switching colors, other information can be multiplexed with the information of the two-dimensional code addressed to all devices, and a large amount of information can be transmitted to a receiving device having a high reading capability of the two-dimensional code.

  The transmission apparatus according to the present invention further includes a light intensity conversion unit that switches light intensity of the two-dimensional code addressed to all devices and multiplexes other information with the information of the two-dimensional code addressed to all devices.

  The information transmission method according to the present invention further includes a light intensity conversion procedure for switching light intensity of the two-dimensional code addressed to all devices and multiplexing other information on the information of the two-dimensional code addressed to all devices.

  According to the present invention, the light intensity of the two-dimensional code addressed to all devices can be switched every predetermined time. By switching the light intensity, other information can be multiplexed on the information of the two-dimensional code addressed to all devices, and a lot of information can be transmitted to a receiving device having a high reading capability of the two-dimensional code.

  The present invention provides a transmission apparatus and an information transmission method thereof capable of transmitting more information to a receiving apparatus having a high two-dimensional code reading ability while ensuring information transmission to a receiving apparatus having a low two-dimensional code reading ability. can do.

It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the information transmission method which concerns on this invention. It is a figure explaining the structure of the transmitter which concerns on this invention. It is a figure explaining the structure of the transmitter which concerns on this invention. It is a figure explaining the structure of the transmitter which concerns on this invention.

  Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below are examples of the present invention, and the present invention is not limited to the following embodiments. In the present specification and drawings, the same reference numerals denote the same components.

(Embodiment 1)
FIG. 10 is a diagram illustrating the transmission device 301 of the present embodiment. A transmission device 301 is a transmission device that transmits the information to a reception device that reads information converted into the two-dimensional code by photographing the two-dimensional code,
Code conversion means 11 for converting information into a two-dimensional code;
Display means 12 for displaying the two-dimensional code converted by the code conversion means 11 on a screen photographed by the receiving device;
A control means 13 for causing the display means 12 to display a plurality of two-dimensional codes converted by the code conversion means 11 on the display means 12 in a time-sharing manner with a display time corresponding to the two-dimensional code reading capability of the receiving device;
Is provided.

  FIG. 1 is a diagram illustrating an information transmission method according to this embodiment. In this information transmission method, the transmitting device 301 dynamically displays a two-dimensional code, and the receiving device (201, 202) displays the two-dimensional code when the receiving device (201, 202) receives the information of the two-dimensional code. Is the method. The two-dimensional code displayed by the transmission device 301 is intended for a reception device having a long readout time (hereinafter referred to as the low-speed reading reception device 201). The readout time is shorter than that of the low-speed reading reception device 201, and various types of information can be received. Some devices are intended for receiving devices (hereinafter, high-speed reading receiving device 202). Further, there may be a device that targets a medium-speed reading / receiving device having a performance that is an intermediate reading time between the low-speed reading / receiving device 201 and the high-speed reading / receiving device 202.

  The low-speed / high-speed reading / receiving device (201, 202) acquires information according to the time of the two-dimensional code displayed by the transmitting device 301. That is, the low-speed reading and receiving apparatus 201 has a coarse time granularity and acquires only a two-dimensional code for the low-speed reading and receiving apparatus that has been displayed for a longer time, and the high-speed reading and receiving apparatus 202 has a fine time granularity, a short time, and a low speed. A two-dimensional code for a high-speed reading and receiving apparatus, which is displayed more than a two-dimensional code for a reading and receiving apparatus, is acquired. Furthermore, the high-speed reading / receiving device 202 has a coarse time granularity and also acquires a two-dimensional code for the low-speed reading / receiving device. For this reason, the two-dimensional code for the low-speed reading receiver may be referred to as “two-dimensional code addressed to all devices”.

FIG. 2 is a diagram for explaining a two-dimensional code for a low-speed / high-speed reading / receiving device that the transmission device 301 displays in a time-sharing manner. There are two or more types of two-dimensional codes, and they change a plurality of times within a unit time _unit . Slow reading receiving apparatus for two-dimensional code transmission time T _L, the transmission time T _H of the high-speed reading receiving apparatus for two-dimensional code in a unit time T _Unit are as follows.
[Formula 1]
T _L = ΣT _lx (x = 1, 2, 3,...)
T _H = ΣT _hy (y = 1, 2, 3,...)
T _lx > T _hy
Where T _L denotes the total time of the two-dimensional code displayed on the low-speed reading reception apparatus for in T _unit, T _lx is per two-dimensional code displayed on the low-speed reading reception apparatus for in T _Unit (The display time may or may not be constant), and x represents the number of times the two-dimensional code for the low-speed reading receiver is displayed in T _unit . T _H denotes the total time of the two-dimensional code displayed on the fast reading reception apparatus for in T _Unit, T _hy is per one two-dimensional code displayed on the fast reading reception apparatus for in T _Unit This represents time (the display time may or may not be constant), and y represents the number of times the two-dimensional code for the high-speed reading and receiving apparatus is displayed in T _unit .

At this time, T _unit is [Formula 2].
T _unit = T _L + _TH
However, a time _TG such as a guard time may be added between the codes to be output. In that case, the unit time T _unit is as follows.
[Formula 3]
T _unit = _TL + _TH + _TG

Further, if the high-speed reading / receiving device 202 can receive a two-dimensional code signal within the reading time of _Th , it can receive all of the two-dimensional code information displayed by the transmitting device 301. On the other hand, the transmitting apparatus 301, with respect to low-speed reading reception device 201, low-speed reading receiving device reads the time _{T Lscan} in consideration _{T lx} slow reading 2-dimensional codes of the receiver for the (display _{time: T lx} is _{T Lscan} more ) Is displayed, the low-speed reading receiver 201 can receive this signal.

  The two-dimensional code for the high-speed reading / receiving device becomes an interference component when the low-speed reading / receiving device 201 receives a two-dimensional code signal addressed to all devices. By using the following code superimposing method, the low-speed reading / receiving device is used. 201 can receive the two-dimensional code information addressed to all devices.

  Further, a synchronization operation between the code display timing of the transmission device 301 and the reception timing of the low-speed reading reception device 201 may be performed. In this case, since the low-speed reading / receiving apparatus 201 can easily determine the timing of reading by synchronization, the reading accuracy of the low-speed reading / receiving apparatus is improved.

  In addition, when the receiving device reads a plurality of two-dimensional codes and acquires them as one data, identifiable information is added to an arbitrary part of the two-dimensional code so that the timing of reading the two-dimensional code of the final data can be understood. May be. For example, when a display with data (eg, displaying black) is continuously transmitted or received a specific number of times or in a certain area or pixel of a two-dimensional code, it may be determined as the last column of data. Further, a case where a display without data (for example, displaying white) is continuously transmitted to a certain area or pixel of the two-dimensional code for a specific number of times or more may be determined as the last column of data.

[Code superposition method]
The control means 13
Display time of 2D code addressed to all devices converted from information readable by all receiving devices,
When the receiving device 201 having the lowest two-dimensional code reading capability captures a plurality of two-dimensional codes including the two-dimensional code addressed to all devices in a unit time and reads the superimposed two-dimensional code, the superimposed two-dimensional code is read. It is assumed that the code can be identified as a two-dimensional code addressed to all devices.

High-speed reading is performed on a pixel (for example, the black pixel portion of the QR code (registered trademark) L1 in FIG. 1) in which information of a two-dimensional code (for example, QR code (registered trademark)) exists for the low-speed reading receiver function The data for the receiving device is superimposed as shown in FIG. At this time, when the superimposed signal in the corresponding pixel per unit time T _unit is received by the low-speed reading receiver 201, the low-speed reading receiver 201 reads the signal in a state where a plurality of types of code information are superimposed. The gradation changes as compared with the signal state for the original low-speed reading / receiving apparatus. For this reason, the time allocation of each code for high speed and low speed per unit time is set so that the superimposed QR code (registered trademark) is equal to or higher than the reading determination threshold R of the low speed reading receiver 201. By performing the code time distribution in this way, the low-speed reading and receiving apparatus 201 can correctly acquire information on the corresponding pixel of the QR code (registered trademark) for the low-speed reading and receiving apparatus.

For example, in the case of a QR code (registered trademark) (FIG. 3), information (a black portion and a white portion) exists in specific pixels in a two-dimensional code for a low-speed reading receiver, and further, a two-dimensional code for a high-speed reading receiver A signal that satisfies the following conditions is output in a situation where information is superimposed on the corresponding location.
[Formula 4]
m (ΣT _lbx + ΣT _hby ) ≧ R _b

Here, m is a constant and is a coefficient for comparing the threshold value _Rb with the integrated value (ΣT _lbx + ΣT _hby ). ΣT _lbx is a time during which a two-dimensional code for a low-speed reading / receiving device (for example, a black pixel) is displayed per unit time T, and ΣT _hby is a two-dimensional code for a high-speed reading / receiving device (for example, a black pixel) ) Is a display time per unit time, and _Rb is a determination threshold value for determining black. In this way, even when there is a superimposed state in the corresponding pixel, the determination threshold _Rb is set, and the display time of each two-dimensional code signal is set based on this numerical value, whereby the low-speed reading receiver 201 Can receive a QR code (registered trademark) for a low-speed reading receiver.

In addition, when a two-dimensional code having a background such as QR code (registered trademark) is used, a QR code (registered trademark) for a high-speed reading receiver is added to the background portion of the QR code (registered trademark) for a low-speed reading receiver. It is also possible to superimpose (see FIG. 3). In this case, it is necessary to contrast or gradient of the relevant background section low-speed reading receiving device 201 receives the set below threshold for determining R _w and background. In addition, the conditions for determining the background portion (in this case, the white portion of the pixel as an example) are as follows.
[Formula 5]
mΣT _hby ≦ R _w
Above expression indicates that the high-speed reading receiving apparatus for a QR code display time in the relevant pixel (black part of the pixel) is set as following determination threshold value R _w as background.

  Further, by combining the above two methods and outputting the two-dimensional code information for the high-speed reading / receiving apparatus to the information part / background part of the two-dimensional code for the low-speed reading / receiving apparatus, more information can be output. Further, if the two-dimensional code for the high-speed reading and receiving apparatus can be superimposed so that the entire two-dimensional code for the low-speed reading and receiving apparatus also becomes the reading determination threshold value of the information part / background part, as shown in FIG. Independent two-dimensional codes (for low-speed reading / receiving devices / for high-speed reading / receiving devices) can be output to transmit information.

  The control means 13 avoids displaying another two-dimensional code in which the code portion is arranged in the background portion around the code portion of the two-dimensional code addressed to all devices in the same unit time as the two-dimensional code addressed to all devices. May be.

If the two-dimensional code for the low-speed reading / receiving apparatus and the two-dimensional code for the high-speed reading / receiving apparatus are to be superimposed, the signal for the high-speed reading / receiving apparatus becomes a noise component for the low-speed reading / receiving apparatus 201. For example, it has an influence such as a decrease in code contrast, and an influence such as a decrease in reading accuracy. Further, when these noise components are present in adjacent pixels (background part) of the two-dimensional code, the contrast between adjacent pixels becomes close, making it difficult to discriminate information. Specifically, when acquiring pixel information in black and white, the contrast changes in the gray direction due to noise on the white pixels, and the contrast changes in the gray direction in the same manner as the white pixels due to noise in the adjacent black pixels. The relative contrast difference between adjacent pixels is reduced, making it difficult to determine whether the information is a black pixel or a white pixel. For this reason, the control means 13 reads the two-dimensional code for the high-speed reading and receiving device in which the code portion exists around the background (background portion) of the two-dimensional code for the low-speed reading and receiving device in the unit time T _unit . Do not superimpose on the two-dimensional code. Since the contrast of the superimposed two-dimensional code can be maintained, it can be avoided that the signal reading accuracy of the low-speed reading receiver 201 is lowered.

For example, in the case of determining the presence or absence of information based on the presence or absence of a specified color in the two-dimensional code of information, the transmitting device side reads the reading threshold value of the receiving device (in this example, the threshold value R _b for reading the pixel as black and the pixel as white threshold R _w) considering that read as, between adjacent pixels, the noise due to high-speed reading reception device for the signals, to avoid the contrast or gradation of black and white pixels, thus closely fixed above, R _b and R _If the identification threshold value of _w is separated (independently) and output as a different value, the two-dimensional code is output so that the relative contrast or gradation value of each other is widened. When the code signal is read, the discrimination becomes easy.

  In addition, when a signal is transmitted only to a receiving device having a specific performance, particularly when it is desired to transmit information only to the high-speed reading receiving device 202, the receiving device transmits a signal for a low-speed reading receiving device (two-dimensional code) for an arbitrary period. This can be realized by transmitting a signal for a high-speed reading and receiving apparatus without transmitting (information).

  Further, when reading the output image of the low-speed reading receiver 201 is performed by scanning the light-receiving elements for each column or scanning for each group of light-receiving elements, a group of codes for the high-speed reading receiver is collectively output. When reading is performed by the low-speed reading and receiving apparatus 201 in a state, the scanning portion (receives a code group for the high-speed reading and receiving apparatus as noise) is received that is not information that should be received. Therefore, in the situation where the two-dimensional code for the low-speed reading receiver is acquired by the above scanning, the display time of the two-dimensional code for the low-speed reading receiver is divided into several, and the code for the high-speed reading receiver is divided between them. Can be prevented from being read in a code for a high-speed reading and receiving apparatus that collectively becomes noise as described above (see FIG. 4).

(Embodiment 2)
FIG. 11 is a diagram illustrating the transmission apparatus 302 according to the present embodiment. In the configuration of the transmission device 301 in FIG. 10, the transmission device 302 switches the color of the code part of the two-dimensional code addressed to all devices and multiplexes other information with the information of the two-dimensional code addressed to all devices. Is further provided. In the present embodiment, the high-speed reading / receiving apparatus 202 can also acquire wavelength information (color information).

  FIG. 5 is a diagram for explaining the information transmission method of the present embodiment. This information transmission method uses the reading time difference of the receiving device for each reading speed, changes the display wavelength (display color) of the two-dimensional code for the low-speed reading receiving device with time as shown in FIG. This is a method of transmitting other information to the high-speed reading and receiving apparatus 202 by using a temporal change in (display color) as a signal.

  The transmitter 302 performs multiplexing by time division as shown in FIG. 2, and then sets the output wavelength of the two-dimensional code itself for all receivers in each section of Tl1, Tl2,..., Tlx in FIG. Thus, further multiplexing is performed.

  The high-speed reading and receiving apparatus 202 sets the reading time shorter than the time when the color changes, so that the information on the two-dimensional code for the high-speed reading and receiving apparatus, the information on the two-dimensional code for the low-speed reading and receiving apparatus, and the information on the color change are obtained. Can be acquired. On the other hand, the low-speed reading receiver 201 cannot acquire the information expressed by the color change, and acquires only the two-dimensional code information for the low-speed reading receiver.

  At this time, as shown in FIG. 6, if two or more (plural) colors can be displayed from the transmission device, information can be transmitted for each color, and various information can be superimposed. In addition, if there is a high-speed reading and receiving apparatus that can receive only a specific color, individual information can be transmitted to each high-speed reading and receiving apparatus.

  Further, depending on the reading accuracy of the two-dimensional code of the high-speed reading receiver 202, a signal due to a temporal change in color may be superimposed on one or more pixels of the two-dimensional code. In this case, the high-speed reading receiver 202 can acquire more information according to the color of the pixel unit or the pixel group.

  On the other hand, the transmission device 302 considers the reading threshold value of the low-speed reading reception device 201, and, for example, has a contrast and gradation value that can read each pixel of the two-dimensional code even when the pixel colors are received by being overlapped by the reception device. The two-dimensional code for the low-speed reading and receiving apparatus with the color changed is displayed. By displaying in this way, the low-speed reading receiver 201 can receive a two-dimensional code for the low-speed reading receiver.

  Further, by setting the high-speed reading / receiving device 202 in advance so as to read information on a specific color or a specific color combination, the high-speed reading / receiving device 202 also receives information on a specific color or color combination. It becomes possible to do.

  Further, there may be a medium-speed reading / receiving device having intermediate performance between the high-speed reading / receiving device and the low-speed reading / receiving device. As shown in FIG. 7, the transmitter 302 transmits the two-dimensional code for the low-speed reading / receiving device according to the reading time of the medium-speed reading / receiving device (the reading time of the low-speed reading / receiving device is longer than the reading time of the high-speed reading / receiving device). (Shorter) can be displayed and can correspond to the medium-speed reading receiver. Note that the transmission device 302 needs to display the two-dimensional code for the medium-speed reading / receiving device for a time during which the medium-speed reading / receiving device can receive the signal even if the signal for the high-speed reading / receiving device becomes an interference component.

  The transmission device 302 may assign a pattern in which specific colors are continuous as a signal for the medium-speed reading reception device. Specifically, as shown in FIG. 8, the transmission device 302 displays the mixed color of the wavelengths λ2 and λ3 for the total time of the time of the wavelength λ2 and the time of the wavelength λ3, and information for the medium-speed reading reception device It can be. The medium-speed reading receiving apparatus receives a two-dimensional pattern of a color in which the corresponding wavelengths are mixed in the reading time, and acquires information.

  By using the transmission device 302 of this embodiment, the high-speed reading / receiving device 202 can acquire more information than the high-speed reading / receiving device 202 described in the first embodiment.

(Embodiment 3)
FIG. 12 is a diagram illustrating the transmission device 303 of the present embodiment. The transmission device 303 further includes a lightness conversion means 15 that switches the light intensity of the two-dimensional code addressed to all devices and multiplexes other information with the information of the two-dimensional code addressed to all devices in the configuration of the transmission device 301 of FIG. Prepare. In the present embodiment, the high-speed reading receiver 202 can also acquire brightness information.

  FIG. 9 is a diagram for explaining the information transmission method of the present embodiment. This information transmission method uses the reading time difference of the receiving device for each reading speed, changes the display brightness of the entire two-dimensional code for the low-speed reading receiving device as shown in FIG. 9, and changes the brightness over time. Is used as a signal to transmit other information to the high-speed reading receiver 202.

  The transmission device 303 performs multiplexing by time division as shown in FIG. 2 and then calculates the output light intensity or brightness of the entire two-dimensional code for all receivers in each section of Tl1, Tl2,..., Tlx. As shown in FIG. 9, it is changed with time and further multiplexing is performed.

  At this time, the high-speed reading and receiving apparatus 202 sets the reading time to be shorter than the time when the brightness changes, so that the two-dimensional code information for the high-speed reading and receiving apparatus, the information of the two-dimensional code for the low-speed reading and receiving apparatus, and the brightness change Information can be obtained. On the other hand, the low-speed reading and receiving apparatus 201 cannot acquire information represented by a change in brightness, and acquires only the two-dimensional code information for the low-speed reading and receiving apparatus.

  Note that the transmission device 303 may change the brightness of the two-dimensional code in two steps (binary modulation) or multiple steps (multi-level modulation) of light intensity (continuous value) or brightness. Further, the fluctuation range of brightness is matched with the reading performance of the low-speed reading receiver 201. Specifically, the two-dimensional code is displayed with the lightness as a relative intensity change (dynamic range) from the maximum value (either light or dark). In this case, the lightness of the two-dimensional code for the low-speed reading and receiving apparatus changes with time, but is always displayed.

  By using the transmission device 303 of this embodiment, the high-speed reading / receiving device 202 can acquire more information than the high-speed reading / receiving device 202 described in the first embodiment. Note that if the transmission device 303 transmits information together with the method using the color change described in the second embodiment, the high-speed reading reception device 202 can acquire more information.

[Appendix]
The following describes the communication system of the present embodiment.

(1):
A system that performs communication using a two-dimensional code between a transmission device and a reception device,
The transmission device converts data to be transmitted into a two-dimensional code on a transmission surface composed of two-dimensionally arranged cells, and outputs a plurality of signals based on temporal changes,
A receiving device capable of receiving only a two-dimensional code as a base displayed by the transmitting device; and
A receiving device capable of receiving all signals displayed by the transmitting device; and
A communication system including a receiving device capable of receiving an arbitrary signal displayed by the device.
(2):
In the communication system according to (1) above,
A transmission that outputs a signal by superimposing a signal that changes with time based on a two-dimensional code and an output wavelength of the two-dimensional code signal that is different from the two-dimensional code information serving as a base. Equipment,
A receiving device that receives only the two-dimensional code signal output from the transmitting device; and
A communication system including a receiving apparatus capable of receiving all or part of a signal superimposed by a temporal change in wavelength.
(3):
In the communication system according to (1) above,
The time-varying signal based on the two-dimensional code and the output intensity (brightness / darkness) of the two-dimensional code signal are temporally changed to superimpose a signal different from the base two-dimensional code information. A transmitting device for outputting;
A receiving device that receives only the two-dimensional code signal output from the transmitting device; and
A communication system including a receiving apparatus capable of receiving all or part of a signal superimposed by a temporal change in output intensity of a two-dimensional code.

  With the communication system of the present embodiment, information (amount) corresponding to the reading time of the receiving device can be acquired including two-dimensional code reading.

11: Code conversion means 12: Display means 13: Control means 14: Color conversion means 15: Lightness conversion means 201: Low-speed reading / receiving device 202: High-speed reading / receiving devices 301 to 303: Transmission device

Claims (8)

A transmitter that transmits the information to a receiver that reads the information converted into the two-dimensional code by photographing the two-dimensional code;
Code conversion means for converting information into a two-dimensional code;
Display means for displaying the two-dimensional code converted by the code conversion means on a screen photographed by the receiving device;
A control means for causing the display means to display a plurality of two-dimensional codes converted by the code conversion means on the display means in a time-sharing manner with a display time corresponding to the two-dimensional code reading capability of the receiving device;
A transmission device comprising: The control means includes
The display time of the two-dimensional code addressed to all devices converted from information readable by all the receiving devices,
When the receiving device having the lowest two-dimensional code reading capability captures a plurality of two-dimensional codes including the two-dimensional code addressed to all devices per unit time and reads the superimposed two-dimensional code, the superimposed two-dimensional code is read. 2. The transmitting apparatus according to claim 1, wherein the code is a time that can be identified as a two-dimensional code addressed to all apparatuses. The control means includes
It is possible to avoid displaying another two-dimensional code in which a code part is arranged in a background portion around the code part of the two-dimensional code addressed to all devices in the same unit time as the two-dimensional code addressed to all devices. The transmission device according to claim 2.   The color conversion means for switching the color of the code part of the two-dimensional code destined for all devices and multiplexing other information on the information of the two-dimensional code destined for all devices, further comprising: The transmitting device according to 1.   5. The light intensity conversion means for switching the light intensity of the two-dimensional code addressed to all devices and multiplexing other information on the information of the two-dimensional code addressed to all devices. The transmitting device described. An information transmission method of a transmitting apparatus for transmitting the information to a receiving apparatus that reads information converted into the two-dimensional code by photographing a two-dimensional code,
A code conversion procedure for converting information into a two-dimensional code;
A display procedure for displaying the two-dimensional code converted by the code conversion procedure on a screen photographed by the receiving device;
A control procedure in which a plurality of two-dimensional codes converted by the code conversion procedure are displayed on the display means in a time-sharing manner with a display time corresponding to the two-dimensional code reading capability of the receiving device;
An information transmission method comprising:   7. The information transmission according to claim 6, further comprising a color conversion procedure for switching the color of the code part of the two-dimensional code addressed to all devices and multiplexing other information on the information of the two-dimensional code addressed to all devices. Method.   The information according to claim 6, further comprising a light intensity conversion procedure for switching light intensity of the two-dimensional code addressed to all devices and multiplexing other information on the information of the two-dimensional code addressed to all devices. Transmission method.

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