JP6773145B2 - Electronic blackboards, communication systems, communication control methods, and programs - Google Patents

Description

The present invention relates to electronic blackboards , communication systems, communication control methods, and programs.

In recent years, communication systems for making calls and conferences via communication networks such as the Internet and leased lines have become widespread in response to requests for reducing the cost and time of moving parties. In such a communication system, content data such as display data such as conference participants and conference materials and stroke data based on manual operations can be shared between communication terminals according to the functions of the communication terminals.

Further, a method of sharing stroke data between client machines via a server machine among electronic blackboards connected to a communication network is disclosed (see Patent Document 1).

By activating multiple functions on the electronic blackboard , multiple functions can be executed at the same timing. However, when a plurality of functions for sharing images between electronic blackboards are activated, there arises a problem that the image displayed by one function becomes difficult to see due to the control of display such as pop-up by the other function. ..

The electronic blackboard of the invention according to claim 1 controls communication between a first communication control means for controlling communication with a first electronic blackboard via a distribution server and a second electronic blackboard. The second communication control means, the acquisition means for acquiring the content data transmitted between the second electronic blackboard in the communication by the second communication control means, and the content data distributed by the distribution server. It has a display control means for controlling the display of an image based on the image, and the first communication control means transmits the content data acquired by the acquisition means to the distribution server and distributes the content data by the distribution server. The content data to be generated includes the first content data transmitted by the first electronic blackboard and the second content data acquired by the acquisition means and transmitted to the distribution server, and is displayed. The control means is characterized in that it controls to superimpose and display the first content data and the second content data.

As described above, according to the present invention, when a plurality of functions for sharing images between electronic blackboards are activated, the image displayed by one function is controlled by the display by the other function. It has the effect of preventing it from becoming difficult to see.

FIG. 1 is an overall configuration diagram of a communication system according to an embodiment. FIG. 2 is a hardware configuration diagram of the electronic blackboard according to the embodiment. FIG. 3 is a hardware configuration diagram of the management system according to the embodiment. FIG. 4 is a hardware configuration diagram of a PC as a video conferencing terminal according to an embodiment. FIG. 5A is a software configuration diagram of the electronic blackboard according to the embodiment. FIG. 5B is a software configuration diagram of the PC according to the embodiment. FIG. 6 is a functional block diagram of an electronic blackboard and a PC that form a part of the communication system according to the embodiment. FIG. 7 is a functional block diagram showing in detail the drawing control unit according to the embodiment. FIG. 8 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 9 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 10 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 11 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 12 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 13 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 14 is a sequence diagram showing the processing of the electronic blackboard or the PC. FIG. 15 is a diagram showing a display example of the display.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

<< Overall configuration of communication system >>
First, the communication system 1 will be described with reference to FIG. FIG. 1 is an overall configuration diagram of a communication system according to an embodiment.

The communication system 1 has a plurality of electronic blackboards 2a, 2b, 2c, a PC 8, a relay device 30, and a management system 50.

The electronic blackboards 2a, 2b, and 2c are communicably connected via the communication network 9a. In addition, the electronic blackboards 2a, 2b, and 2c are provided with displays 3a, 3b, and 3c, respectively.

The electronic blackboards 2a, 2b, 2c are drawn by an event generated by the electronic pens 4a, 4b, 4c (the pen tip of the electronic pens 4a, 4b, 4c on the displays 3a, 3b, 3c, or the touch of the pen tail). The image can be displayed on the displays 3a, 3b, 3c. The electronic blackboards 2a, 2b, and 2c are based on not only the electronic pens 4a, 4b, 4c but also events (gestures such as enlargement, reduction, page turning, etc.) caused by the user's hands Ha, Hb, Hc, etc. It is also possible to change the image displayed on the displays 3a, 3b, 3c. Hereinafter, when any of the electronic blackboards 2a, 2b, and 2c is indicated, it is referred to as the electronic blackboard 2. When any display among the displays 3a, 3b, and 3c is shown, it is referred to as display 3. Further, when any electronic pen among the electronic pens 4a, 4b, and 4c is indicated, it is indicated as the electronic pen 4. Further, when an arbitrary hand among the user's hands Ha, Hb, and Hc is indicated, it is indicated as a hand H.

Further, USB (Universal Serial Bus) memories 5a, 5b, 5c can be connected to the electronic blackboards 2a, 2b, 2c. The electronic whiteboards 2a, 2b, 2c can read electronic files such as PDF (Portable Document Format) from the USB memories 5a, 5b, 5c, and can record the electronic files in the USB memories 5a, 5b, 5c. In addition, the electronic blackboard 2a is connected to a notebook via a cable capable of communicating according to standards such as DisplayPort, DVI (Digital Visual Interface), HDMI (registered trademark) (High-Definition Multimedia Interface) and VGA (Video Graphics Array). PC6a, 6b, 6c are connected. When any USB memory among the USB memories 5a, 5b, and 5c is indicated, it is referred to as USB memory 5. When any notebook PC among the notebook PCs 6a, 6b, and 6c is indicated, it is indicated as the notebook PC 6.

As a result, the stroke data of the stroke drawn on the display 3 of the electronic blackboard 2 at one base is transmitted to the electronic blackboard 2 at the other base via the communication network 9a, so that the display 3 at the other base It is also displayed above. On the contrary, the stroke data of the stroke drawn on the display 3 of the electronic blackboard 2 at another base is transmitted to the electronic blackboard 2 of one base via the communication network 9a, so that the electronic blackboard 2 of one base Is displayed on the display 3. As described above, since the communication system 1 can perform remote sharing processing for sharing the same image at a remote location, it is very convenient to use it for a conference or the like at a remote location.

In addition to the above-mentioned electronic blackboard 2, when a communication terminal other than the electronic blackboard connects to the communication network 9a, the other communication terminal shares stroke data with the electronic blackboard 2 via the communication network 9a. You can also do it. Other communication terminals include PCs, video conferencing terminals, tablets, smartphones, electronic signage (digital signage), telestrator used for sports and weather forecasts, and image processing devices such as remote image (video) diagnostic devices. , A computer such as a terminal capable of supplying image frames such as a mobile information terminal, a digital video camera, a digital camera, and a game machine.

The electronic blackboard 2c, the PC (Personal computer) 8, the relay device 30, and the management system 50 are communicably connected via the communication network 9b.

The electronic blackboard 2c and the PC 8 communicate by transmitting and receiving display data such as conference materials as an example of content data. The display data is image data of an image that can be displayed on the display. The display data may be moving image data or still image data, and may be both moving image data and still image data.

The relay device 30 performs a process of relaying content data between the electronic blackboard 2c and the PC 8. The management system 50 centrally manages the communication status of the electronic blackboard 2c and the PC 8.

When a communication terminal other than the electronic blackboard 2c and the PC 8 is connected to the communication network 9b, the other communication terminal may share the display data with the electronic blackboard 2c and the PC 8 via the communication network 9b. it can. As other communication terminals, we supply image frames for video conference terminals, tablets, smartphones, electronic signage (digital signage), telestrator, image processing devices, personal digital assistants, digital video cameras, digital cameras, game consoles, etc. Computers such as capable terminals are included.

The electronic blackboard 2c can simultaneously share both stroke data and display data between communication terminals by activating both a module for sharing stroke data and a module for sharing display data. it can.

According to one embodiment, the communication network 9a is an intranet and the communication network 9b is the Internet. However, the communication networks 9a and 9b are selected from arbitrary communication networks such as the Internet, LAN (Local Area Network), intranet, and mobile phone network according to the protocol of each communication terminal. Further, the communication networks 9a and 9b may be the same communication network as in the case where both are the Internet.

Further, in one embodiment, the USB memory will be described as an example of the recording medium, but the present invention is not limited to this, and various recording media such as an SD card may be used as another example of the recording medium.

<Hardware configuration of electronic blackboard>
The hardware configuration of the electronic blackboard according to the embodiment will be described with reference to FIG. Note that FIG. 2 is a hardware configuration diagram of the electronic blackboard according to the embodiment.

As shown in FIG. 2, the electronic whiteboard 2 is a work of a CPU (Central Processing Unit) 201 that controls the operation of the entire electronic whiteboard 2, a ROM 202 that stores a program used to drive a CPU 201 such as an IPL, and a CPU 201. RAM 203 used as an area, SSD 204 for storing various data such as programs for electronic whiteboards, network controller 205 for controlling communication with communication network 9, and external storage controller 206 for controlling communication with USB memory 5. I have. Further, the electronic blackboard 2 displays video information as a still image or a moving image on the display of the camera 207 that captures the subject under the control of the CPU 201, the image pickup element I / F208 that controls the drive of the camera 207, and the notebook PC 6. It includes a capture device 211, a GPU (Graphics Processing Unit) 212 that specializes in graphics, and a display controller 213 that controls and manages a screen display to output an image output from the GPU to the display 3. Further, the electronic blackboard 2 includes a sensor controller 214 that controls the processing of the contact sensor 215, and a contact sensor 215 that detects that the electronic pen 4 or the user's hand H or the like touches the display 3. In one embodiment, the contact sensor 215 inputs coordinates and detects coordinates by an infrared blocking method. In the method of inputting the coordinates and detecting the coordinates, two light receiving / receiving devices installed at both upper ends of the display 3 radiate a plurality of infrared rays in parallel with the display 3 and are provided around the display 3. This is a method of receiving light that is reflected by a reflecting member and returns on the same optical path as the light path emitted by the light receiving element. The contact sensor 215 outputs an infrared ID (Identification) emitted by two light emitting / receiving devices blocked by the object to the sensor controller 214, and the sensor controller 214 identifies a coordinate position which is a contact position of the object. All the IDs shown below are examples of identification information.

Further, the contact sensor 215 is not limited to the infrared blocking method, but is a touch panel of the capacitance type that identifies the contact position by detecting a change in capacitance, and the contact position is determined by a voltage change of two opposing resistance films. Various detection means such as a touch panel of the resistance film type to be specified and a touch panel of the electromagnetic induction type which detects the electromagnetic induction generated by the contact object coming into contact with the display unit and specifies the contact position may be used. Further, the contact sensor 215 may use a camera to determine the contact and specify the coordinate position.

Further, the electronic blackboard 2 includes an electronic pen controller 216. The electronic pen controller 216 determines whether or not there is a touch of the pen tip or a touch of the pen tail on the display 3 by communicating with the electronic pen 4. The electronic pen controller 216 may determine whether or not there is a touch not only on the pen tip and pen end of the electronic pen 4 but also on the portion held by the user of the electronic pen 4 and other electronic pen portions.

Further, the electronic blackboard 2 is a sound input / output I / F 224 that processes sound signal input / output between the microphone 222 for inputting sound, the speaker 223 for outputting sound, and the microphone 222 and the speaker 223 under the control of the CPU 101. It also includes an operation button 225 that accepts user operations and a power switch 226 for switching the power ON / OFF of the electronic blackboard 2.

Further, the electronic blackboard 2 includes a bus line 230 such as an address bus or a data bus for electrically connecting the above-mentioned components to each other.

The program for the electronic blackboard may be recorded on a computer-readable recording medium such as a CD-ROM or a server on the network for distribution or download.

<Hardware configuration of management system>
The hardware configuration of the management system according to the embodiment will be described with reference to FIG. Note that FIG. 3 is a hardware configuration diagram of the management system according to the embodiment.

The management system 50 includes a CPU 501 that controls the operation of the entire management system 50, a ROM 502 that stores a transmission management program, a RAM 503 that is used as a work area of the CPU 501, and an HD (Hard Disk) 504 that stores various data. The HDD 505 controls reading and writing of various data to the HD 504 according to the control of the CPU 501, and the media I / F 507 controls reading and writing (storage) of data to a recording medium 506 such as a flash memory. Further, the management system 50 includes a display I / F 508 for displaying various information such as a cursor, a menu, a window, characters, and an image on the display 516, and a network I / F for transmitting data using the communication network 9. F509, keyboard 511 equipped with multiple keys for inputting characters, numerical values, various instructions, etc., and mouse 512 for selecting and executing various instructions, selecting processing targets, moving pointing devices such as mouse cursors, etc. And have. Further, the management system 50 is located between a CD-ROM drive 514 that controls reading and writing of data to a CD-ROM (Compact Disc Read Only Memory) 513 as an example of a removable recording medium, and an external device. It includes an external device I / F 515 for transmitting and receiving information, and a bus line 510 such as an address bus or a data bus for electrically connecting each of the above components to each other.

Further, the transmission management program may be a file in an installable format or an executable format, and may be recorded and distributed on a computer-readable recording medium such as the recording medium 506 or the CD-ROM 513. .. The transmission management program may be stored in the HD504.

<PC hardware configuration>
FIG. 4 is a hardware configuration diagram of the PC 8 as a video conferencing terminal according to the embodiment. PC8 includes CPU801, ROM802, RAM803, flash memory 804, SSD805, media I / F807, power switch 809, bus line 810, network I / F811, camera 812, image pickup element I / F813, microphone 814, speaker 815, and sound input. It includes an output I / F 816, a display I / F 817, an external device connection I / F 818, a keyboard 821, and a mouse 822. Of these, the CPU 801 controls the operation of the entire PC 8. The ROM (Read Only Memory) 802 stores a program used for driving the CPU 801 such as an IPL (Initial Program Loader). The RAM (Random Access Memory) 803 is used as a work area of the CPU 801. The flash memory 804 stores various data such as a communication program, display data, and sound data.
The SSD (Solid State Drive) 805 controls reading or writing of various data to the flash memory 804 according to the control of the CPU 801. An HDD may be used instead of the SSD. The media I / F807 controls reading or writing (storage) of data to a recording medium 806 such as a flash memory.

Further, the network I / F (Interface) 811 is an interface for performing data communication using the communication network 9b. The camera 812 is a kind of built-in imaging means that images a subject and obtains display data under the control of the CPU 801. The image sensor I / F 813 is a circuit that controls the drive of the camera 812. The microphone 814 is a kind of built-in sound collecting means for inputting voice. The sound input / output I / F 816 is a circuit that processes sound signal input / output between the microphone 814 and the speaker 815 under the control of the CPU 801. The display I / F 817 is a circuit that transmits display data to the external display 820 under the control of the CPU 801. The external device connection I / F818 is an interface for connecting various external devices. The keyboard 821 includes a plurality of keys for inputting characters, numerical values, various instructions, and the like. The mouse 822 selects and executes various instructions, selects a processing target, moves a pointing device such as a mouse cursor, and the like.

Further, the bus line 810 is an address bus, a data bus, or the like for electrically connecting each component shown in FIG. 4 such as the CPU 801.

The display 820 is a kind of display means composed of a liquid crystal or an organic EL for displaying an image of a subject, an operation icon, and the like. Further, the display 820 is connected to the display I / F 817 by the cable 820c. The cable 820c may be a cable for analog RGB (VGA) signals, a cable for component video, HDMI (registered trademark) (High-Definition Multimedia Interface), or DVI (Digital Video). It may be a cable for an Interactive) signal.

The camera 812 includes a lens and a solid-state image sensor that converts light into electric charges to digitize an image (video) of the subject. As the solid-state image sensor, CMOS (Complementary Metal Oxide Semiconductor) or CCD (Charge Coupled) Device) etc. are used. External devices such as an external camera, an external microphone, and an external speaker can be connected to the external device connection I / F818 by a USB (Universal Serial Bus) cable or the like. When an external camera is connected, the external camera is driven in preference to the built-in camera 812 according to the control of the CPU 801. Similarly, when an external microphone is connected or an external speaker is connected, the external microphone and the external speaker are given priority over the built-in microphone 814 and the built-in speaker 815 according to the control of the CPU 801. The external speaker is driven.

Further, the recording medium 806 has a structure that is detachable from the PC 8. Further, as long as it is a non-volatile memory that reads or writes data under the control of the CPU 801, not only the flash memory 804 but also an EEPROM (Electrically Erasable and Programmable ROM) or the like may be used.

<Software configuration>
FIG. 5A is a software configuration diagram of the electronic blackboard according to the embodiment. As shown in FIG. 5A, the OS (Operating System) 2020, the communication application A11, and the communication application B10 operate on the work area 2010 of the RAM 203. Hereinafter, the application will be referred to as an "application".

OS2020 is basic software that provides basic functions and manages the entire electronic blackboard. The communication applications A11 and B10 are applications for communicating with other terminals, and each has a different communication protocol. The communication application A11 causes the electronic blackboard 2 to execute a communication control function for transmitting stroke data with another communication terminal and an image processing function for outputting stroke data as an image. On the other hand, the communication application B10 causes the electronic blackboard 2 to execute a communication control function for transmitting display data such as video conference materials with another communication terminal. On the other hand, the communication application B10 does not have an image processing function for outputting display data. The communication application B10 may be, for example, a communication application B11 having both a communication control function and an image processing function related to display data, excluding the image processing function by using a software development kit.

The OS2020 and the communication application A11 are installed on the electronic blackboard 2 before being shipped from the factory. Further, the communication application B10 can be arbitrarily installed on the electronic blackboard 2 after being shipped from the factory. Hereinafter, it is assumed that the communication application B10 is installed on the electronic blackboard 2c and the communication application B10 is not installed on the electronic blackboards 2a and ab.

FIG. 5B is a software configuration diagram of the PC according to the embodiment. As shown in FIG. 5B, the OS 8020 and the communication application B11 operate on the work area 8010 of the RAM 803.

OS8020 is basic software that provides basic functions and manages the entire PC8. The communication application B11 causes the PC 8 to execute a communication control function for transmitting display data such as conference materials with another communication terminal and an image processing function for outputting the display data as an image.

Further, the OS 8020 and the communication application B11 are installed on the PC 8 before or after the factory shipment.

<< Functional configuration of the embodiment >>
Next, the functional configuration of the communication system according to the embodiment will be described. FIG. 6 is a functional block diagram of an electronic blackboard and a PC that form a part of the communication system according to the embodiment. In FIG. 6, the electronic blackboards 2a, 2b, and 2c are connected so that data communication can be performed via the communication network 9a. Further, in FIG. 6, the electronic blackboard 2c and the PC 8 are connected so that data communication can be performed via the communication network 9b.

The electronic blackboard 2 realizes each functional configuration shown in FIG. 6 by the hardware configuration and program shown in FIG. 2. Further, the electronic blackboard 2 has a storage unit 2000 constructed by SSD 204. The PC 8 realizes each functional configuration shown in FIG. 6 by the hardware configuration and program shown in FIG. Further, the PC 8 has a storage unit 8000 constructed by the SSD 805.

The electronic blackboard 2 can be a "sponsoring device" that first starts the remote sharing process, and can also be a "participating device" that later participates in the remote sharing process that has already been started. Further, the electronic blackboard 2 is roughly divided into both a client unit 20 and a server unit 90. The client unit 20 and the server unit 90 are functions realized by activating the communication application A11 in one housing of the electronic blackboard 2. Of the client unit 20 and the server unit 90, the electronic blackboard 2 may be provided with the client unit 20, and the server unit 90 may be a device different from the electronic blackboard 2 such as a distribution control device.

When the electronic blackboard 2 serves as a host device, the client unit 20 and the server unit 90 are realized (executed) in the electronic blackboard 2. Further, when the electronic blackboard 2 serves as a participating device, the client unit 20 is realized (executed) in the electronic blackboard 2, but the server unit 90 is not realized (executed). That is, when the electronic blackboard 2a is the host device and the electronic blackboards 2b and 2c are the participating devices, the client unit 20 of the electronic blackboard 2a is connected to another electronic device via the server unit 90 realized in the same electronic blackboard 2a. Communicates with the client unit 20 of the blackboards 2b and 2c. On the other hand, the client unit 20 of the electronic blackboards 2b and 2c communicates with the client unit of the other electronic blackboards 2a, 2b or 2c via the server unit 90 realized in the other electronic blackboard 2a.

Further, in the electronic blackboards 2b and PC8, the client unit 80 is realized by activating the communication applications B10 and B11. The client unit 80 communicates with the client unit 80 of another communication terminal via the relay device 30 in the communication established by the call control of the management system 50 as a server.

[Functional configuration of client unit 20]
The client unit 20 has a communication control unit 21 and a drawing control unit 22.

The communication control unit 21 is realized by a command from the CPU 201 or a network controller 205, and performs communication with another electronic blackboard 2 and communication with the communication control unit 91 described later in the server unit 90 via the communication network 9a. Control.

The drawing control unit 22 is realized by a command from the CPU 201, and is based on stroke data generated by an operation on the display 3 or data acquired from a USB memory 5, a notebook PC 6, a communication control unit 21, a storage unit 2000, or the like. Perform image processing. Further, the drawing control unit 22 controls to generate an image layer based on the processed data and output a superimposed image in which these layers are superimposed.

FIG. 7 is a functional block diagram showing in detail the drawing control unit according to the embodiment. The drawing control unit 22 includes a stroke processing unit 22A, an acquisition unit 22B, a conversion unit 22X, a superimposition unit 22Y, and a page processing unit 22Z.

The stroke processing unit 22A is realized by a command from the CPU 201, and when an event of stroke drawing occurs by the operation of the electronic pen 4 or the hand H on the display 3, the stroke processing unit 22A performs a process of generating stroke data according to the operation.

The acquisition unit 22B is realized by a command from the CPU 201 and acquires the data stored in the storage unit 2000.

The conversion unit 22X is realized by an instruction from the CPU 201 and performs a process of converting various data. This conversion may include text conversion, real data (binary) conversion, serialization, deserialization, encoding, decoding, and the like.

The superimposition unit 22Y is realized by a command from the CPU 201, generates each image layer based on each data, and performs a process of superimposing them.

The page processing unit 22Z collects the stroke data and the display data into one page data and stores it in the page data storage unit 220 which is a part of the storage unit 2000.

The page data storage unit 220 is constructed as a part of the storage unit 2000 and stores page data as shown in Table 1. Table 1 is a conceptual diagram showing page data. The page data is data for one page (stroke array data (each stroke data) and media data) displayed on the display 3.

The page data includes a page data ID for identifying an arbitrary page, a start time indicating the time when the display of this page is started, and an end time indicating the time when the contents of the page are no longer rewritten by strokes or gestures. , The stroke array data ID for identifying the stroke array data generated by the stroke by the electronic pen 4 or the user's hand H, and the media data ID for identifying the media data are stored in association with each other. The stroke array data is data for displaying the stroke image on the display 3. The media data is data for displaying another image superimposed on the stroke image on the display 3.

In addition, the stroke array data shows detailed information as shown in Table 2. Table 2 is a conceptual diagram showing stroke array data. As shown in Table 2, one stroke array data is represented by a plurality of stroke data. Then, one stroke data includes a stroke data ID for identifying the stroke data, a start time indicating the writing start time of one stroke, an end time indicating the writing end time of one stroke, and a stroke color. The width of the stroke and the coordinate array data ID for identifying the array of passing points of the stroke are shown. For example, when the user draws the alphabet "S" with the electronic pen 4, it is written in one stroke, so that one stroke data ID and one letter alphabet [S] are shown. However, when the user draws the alphabet "T" with the electronic pen 4, it is written in two strokes, so that the alphabet "T" of one character is indicated by two stroke data IDs.

Further, this coordinate array data shows detailed information as shown in Table 3. Table 3 is a conceptual diagram showing coordinate array data. The coordinate array data includes one point (X coordinate value, Y coordinate value) on the display 3, the time (ms) of the difference from the start time of the stroke when passing through this one point, and the electronic pen at this one point. Each information of the pen pressure of 4 is shown. That is, a set of one point shown in Table 3 is shown by one coordinate array data shown in Table 2. For example, when the user draws the alphabet "S" with the electronic pen 4, it is written in one stroke, but since the user passes through a plurality of passing points by the time the drawing of the "S" is completed, the coordinate array data has these multiple passing points. Information is shown.

Further, the media data among the page data shown in Table 1 shows detailed information as shown in Table 4. Table 4 is a conceptual diagram showing media data. As shown in FIG. 9, the media data is displayed on the display 3 according to the media data ID in the page data shown in Table 1, the data type of the media data, the recording time when the media data is stored, and the media data. The position (X coordinate value, Y coordinate value) of the displayed image, the size (width, height) of the image, and the data indicating the content of the media data are shown in association with each other. Of these, the position of the image displayed on the display 3 by the media data is displayed by the media data when the coordinates of the upper left corner of the display 3 are (X coordinate value, Y coordinate value) = (0,0). It shows the position of the upper left corner of the image to be displayed.

[Functional configuration of server unit 90]
The server unit 90 has a communication control unit 91.

The communication control unit 91 is realized by a command from the CPU 201, and is realized by a communication control unit 21 in the client unit 20 in the same electronic blackboard 2 and a communication control unit in the client unit 20 in another electronic blackboard 2 via the communication network 9a. Controls communication with 21.

[Functional configuration of client unit 80]
The communication control unit 81 of the client unit 80 is realized by a command from the CPUs 201 and 801 or a network controller 205 or a network I / F 811 and controls communication with the communication control unit 81 in the client unit 80 of another communication terminal. To do.

The display control unit 82 of the client unit 80 is a function realized by an instruction from the CPU 801 by activating the communication application B11. The display control unit 82 performs image processing based on the data acquired from the communication control unit 21, the storage unit 8000, and the like, and controls to output an image.

<< Processing or operation of the embodiment >>
Subsequently, the process or operation according to the embodiment will be described with reference to FIGS. 8 to 11.
8 to 11 are sequence diagrams showing the processing of the electronic blackboard or the PC.

(Communication establishment process between electronic blackboards)
A process of establishing communication by the communication application A11 between the electronic blackboards 2a, 2b, and 2c will be described with reference to FIG. When the user turns on the power switch 226 of the electronic blackboard 2a, the communication application A11 is activated to start the processing of the client unit 20 of the electronic blackboard 2a (step S1). Then, when the request for hosting the conference is received by the operation on the display 3a, the communication control unit 21 of the client unit 20 instructs the communication control unit 91 of the server unit 90 of the same electronic blackboard 2a to start the processing of the server unit 90. Is output. As a result, in the electronic blackboard 2a, not only the client unit 20 but also the server unit 90 can start various processes (step S2).

Next, the communication control unit 91 of the electronic blackboard 2a generates connection information for establishing a connection with the electronic blackboard 2a, and the client unit 20 displays the generated connection information on the display 3a (step S3). This connection information includes the IP address of the host device and the passcode generated for this remote sharing process. This passcode is stored in the storage unit 2000. Then, the connection information is transmitted to the users of the electronic blackboards 2b and 2c by the user of the electronic blackboard 2a by telephone or e-mail.

Next, in the electronic blackboards 2b and 2c, when the user turns on the power switch 226 of the electronic blackboards 2b and 2c, the communication application A11 is activated to start the processing of the client unit 20 of the electronic blackboards 2b and 2c (step). S4, S5). When the input of the connection information is received by the operation on the displays 3b and 3c on the electronic whiteboards 2b and 2c, the communication control unit 21 in the client unit 20 of the electronic whiteboards 2b and 2c communicates based on the IP address of the connection information. A passcode is transmitted to the communication control unit 91 in the server unit 90 of the electronic blackboard 2a via the network 9a to request participation (steps S6 and S7). The communication control unit 91 of the electronic blackboard 2a receives a participation request (including a passcode) from the electronic blackboards 2b and 2c.

Next, the communication control unit 91 authenticates the passcodes received from the electronic blackboards 2b and 2c using the passcodes managed by the storage unit 2000 (step S8). Then, the communication control unit 91 notifies the client unit 20 of each of the electronic blackboards 2b and 2c of the authentication result (steps S9 and S10). If it is determined by the authentication in step S8 that each of the electronic blackboards 2b and 2c is a legitimate electronic blackboard, remote sharing between the electronic blackboard 2a which is the host device and the electronic blackboards 2b and 2c which are the participating devices Communication of processing is established (steps S11, S12).
In this embodiment, a case where the content data transmitted between the electronic blackboards 2a, 2b, and 2c includes stroke data will be described.

(Communication establishment process between electronic blackboard and PC)
A process of establishing communication by the communication applications B10 and B11 between the electronic blackboard 2c and the PC 8 will be described with reference to FIG.

When the client unit 20 receives the activation request of the communication application B10 by the operation on the display 3c of the electronic blackboard 2c, the client unit 80 can start various processes (step S21).

Subsequently, the communication control unit 81 of the client unit 80 makes a login request to the management system 50 (step S22). As a result, the management system 50 receives the login request.

The management system 50 authenticates the electronic blackboard 2c of the login request source (step S23), and transmits the authentication result to the electronic blackboard 2c of the login request source (step S24). As a result, the communication control unit 81 of the electronic blackboard 2c receives the authentication result. Hereinafter, the case where it is determined that the login request source is legitimate according to step S23 will be continued.

When the activation request of the communication application B11 is received in the PC8 based on the operation of the keyboard 821 or the mouse 822, the communication application B11 is activated and the processing of the client unit 80 of the PC8 can be started (step S31).

Subsequently, the communication control unit 81 of the client unit 80 makes a login request to the management system 50 (step S32). As a result, the management system 50 receives the login request.

The management system 50 authenticates the login request source PC8 (step S33), and transmits the authentication result to the PC8 (step S34). Hereinafter, the case where it is determined that the login request source is legitimate according to step S33 will be continued.

The communication control unit 81 of the electronic blackboard 2c requests the management system 50 to start communication in response to an operation on the display 3c (step S41). The communication start request includes the communication ID of the electronic blackboard 2c of the communication start request source and the communication ID of the destination PC8. As a result, the management system 50 receives the communication start request. The communication ID is information for identifying a communication destination, and includes identification information of a communication terminal and an account of a user of the communication terminal.

Next, the management system 50 requests the destination PC 8 to start communication (step S42). The communication start request includes the communication ID of the electronic blackboard 2c of the communication start request source and the communication ID of the destination PC8 sent in step S41. As a result, the destination PC 8 receives the communication start request.

On the other hand, the communication control unit 81 of the PC 8 transmits information indicating whether or not the response is possible to the management system 50 in response to the operation input by the user (step S43). Hereinafter, the case where the PC 8 transmits the information indicating the response to the management system 50 will be described.

As a result, the management system 50 receives information indicating that it responds. The management system 50 transmits the information indicating the response sent from the destination PC 8 in step S13 to the electronic blackboard 2c of the start request source (step S44). As a result, the communication control unit 81 of the electronic blackboard 2c receives the information indicating that it responds.

Subsequently, the management system 50 controls to establish communication between the electronic blackboard 2c and the PC 8 for transmitting content data via the communication network 9b (step S45). The method for establishing communication is not particularly limited, but for example, when the communication network 9b is provided with the relay device 30 for relaying the content data, the management system 50 provides the connection information for connecting to the relay device. Can be mentioned as a method of transmitting to the electronic blackboard 2c and the PC8. Further, the management system 50 may transmit a request to start relaying the content data between the electronic blackboard 2c and the PC 8 to the relay device 30. Based on the above control, communication between the electronic blackboard 2c and the PC 8 is established (step S46). As a result, the electronic blackboard 2c and the PC 8 can send and receive content data to and from the communication partner. In this embodiment, the case where the content data transmitted between the electronic blackboard 2c and the PC 8 includes the display data (video data or still image data) of the conference material will be described.

(Display of superimposed image)
Subsequently, the process of displaying the superimposed image in the remote sharing process will be described with reference to FIG.

First, when the user of the electronic blackboard 2b draws a stroke image on the electronic blackboard 2b using the electronic pen 4b, the stroke processing unit 22A is drawn based on the coordinate position of the contact portion between the electronic pen 4b and the display 3b. The stroke data of the stroke is generated (step S61). The generated stroke data includes each parameter shown in Tables 1 to 3 above. The conversion unit 22X serializes (serializes) the stroke data in a plurality of stroke units (step S62). The communication control unit 21 of the electronic blackboard 2b transmits serialized stroke data to the communication control unit 91 of the electronic blackboard 2a, which is the host device, via the communication network 9a (step S63). The electronic blackboard 2b may sequentially transmit stroke data to the electronic blackboard 2a, which is the host device, each time it is drawn.

When the communication control unit 91 of the electronic blackboard 2a receives the stroke data sent from the electronic blackboard 2b, the communication control unit 91 transmits the stroke data to the client unit 20 of the electronic blackboard 2a. The transmitted stroke data is received by the communication control unit 21 of the client unit 20 of the electronic blackboard 2a. The conversion unit 22X in the drawing control unit 22 of the client unit 20 deserializes (parallelizes) the stroke data (step S64). The deserialized stroke data is stored in the page data storage unit 220 by the page processing unit 22Z. Subsequently, the superimposition unit 22Y combines the data for each stroke based on the data stored in the page data storage unit 220, and the combined stroke image (B) layer, UI image (A) layer, and output. A layer of the image (C) and a layer of the background image (D) are generated. Then, the superimposition unit 22Y superimposes each generated layer and displays the superimposition image (A, B, C, D) on the display 3a (step S65). The layer of the stroke image (B) is generated based on the stroke data deserialized by the above processing and stored in the page data storage unit 220. The layer of the output image (C) is generated based on the media data stored in the page data storage unit 220. The layer of the UI image (A) and the background image (D) are generated based on the data stored in the storage unit 2000 in advance. FIG. 15A is a diagram showing a display example of the display in step S65.

Further, the communication control unit 91 of the electronic blackboard 2a transmits the serialized stroke data sent from the electronic blackboard 2b to the client units 20 of the electronic blackboards 2b and 2c (steps S66 and S67). The transmitted stroke data is received by the communication control unit 21 of the client unit 20 of the electronic blackboards 2b and 2c. The client unit 20 of the electronic blackboards 2b and 2c displays superimposed images (A, B, C, D) including stroke data sent from the electronic blackboard 2a on the displays 3b and 3c. Since this process is the same as the process of steps S64 and S65 in the client unit 20 of the electronic blackboard 2a, the description thereof will be omitted (steps S68 to S71). The processing when the stroke image is drawn on the electronic blackboards 2a and 2c is the same as the processing in steps S61 to S71 except that the client unit 20 of the electronic blackboard 2b is replaced with the client unit 20 of the electronic blackboards 2a and 2c. Since there is, the explanation is omitted.

(Display of output image)
Subsequently, the process of displaying the output image (C) in the remote sharing process will be described with reference to FIG.

The display control unit 82 of the PC 8 captures the screen of the conference material displayed on the display 820 and acquires the display data (step S81). The communication control unit 81 of the PC 8 transmits the acquired display data to the client unit 80 of the electronic blackboard 2c via the relay device 30 (step S82). The display data transmitted by the PC 8 is received by the communication control unit 81 of the electronic blackboard 2c. The communication control unit 81 of the electronic blackboard 2c stores the received display data in the storage unit 2000.

The acquisition unit 22B of the client unit 20 of the electronic blackboard 2c acquires the display data stored in the storage unit 2000 (step S83). The conversion unit 22X of the client unit 20 of the electronic blackboard 2c converts the display data such as a PDF file acquired by the acquisition unit 22B into a text format as a format that can be transmitted by the communication application A11 (step S84). The conversion unit 22X serializes the display data converted into the text format (step S85). The communication control unit 21 of the electronic blackboard 2c transmits serialized display data to the communication control unit 91 of the electronic blackboard 2a, which is the host device, via the communication network 9a (step S86).

When the communication control unit 91 of the electronic blackboard 2a receives the display data sent from the electronic blackboard 2c, the communication control unit 91 transmits the display data to the client unit 20 of the electronic blackboard 2a. The transmitted display data is received by the communication control unit 21 of the client unit 20 of the electronic blackboard 2a. The conversion unit 22X in the drawing control unit 22 of the client unit 20 deserializes the display data (step S87). Further, the deserialized display data is converted into actual data (binary) by the conversion unit 22X. The obtained actual data is stored as media data in the page data storage unit 220 by the page processing unit 22Z (step S88). Subsequently, the superimposition unit 22Y is a layer of an output image (C), a layer of a stroke image (B), and a layer of a UI image (A) based on the display data based on the data stored in the page data storage unit 220. , And the layer of the background image (D) is created. The superimposition unit 22Y superimposes the created layers and displays the superimposed images (A, B, C, D) on the display 3a (step S89). The layer of the output image (C) is converted into actual data by the above processing, and is generated based on the media data stored in the page data storage unit 220. By superimposing the stroke image layer (B) on the output image (C) layer, the superimposition unit 22Y can output the display data without interfering with the stroke data output. FIG. 15B is a diagram showing a display example of the display in step S89.

Further, the communication control unit 91 of the electronic blackboard 2a transmits the serialized display data sent from the electronic blackboard 2c to the client units 20 of the electronic blackboards 2b and 2c (steps S90 and S91). The transmitted display data is received by the communication control unit 21 of the client unit 20 of the electronic blackboards 2b and 2c. The client unit 20 of the electronic blackboards 2b and 2c displays superimposed images (A, B, C, D) on the displays 3b and 3c in which the display data sent from the electronic blackboard 2a is included as an output image (B). indicate. Since this process is the same as the process of steps S87 to S89 in the client unit 20 of the electronic blackboard 2a, the description thereof will be omitted (steps S92 to S97).

<< Modification A of the embodiment >>
Next, the modification A of the embodiment will be described as different from the above-described embodiment. In the modification A, the display control unit 82 of the PC 8 has a function of controlling the display of the stroke data drawn by the operation of the mouse 822.

FIG. 12 is a sequence diagram showing the processing of the electronic blackboard or the PC. When the user of the PC 8 draws a stroke image using the mouse 822, the display control unit 82 generates stroke data corresponding to the stroke image (step S100). This stroke data includes each parameter of Tables 1 to 3 above. The communication control unit 81 of the PC 8 transmits stroke data to the client unit 80 of the electronic blackboard 2c via the communication network 9b (step S101).

The transmitted stroke data is received by the communication control unit 81 of the client unit 80 of the electronic blackboard 2c. Each time the stroke data is received, the received stroke data is stored in the storage unit 2000 by the communication control unit 81. The acquisition unit 22B of the client unit 20 of the electronic blackboard 2c acquires the stroke data for each stroke stored in the storage unit 2000 (step S102). The conversion unit 22X of the client unit 20 of the electronic blackboard 2c serializes the stroke data of a plurality of stroke units acquired by the acquisition unit 22B into a format that can be transmitted by the communication control unit 21 (step S103). The communication control unit 21 of the electronic blackboard 2c transmits the serialized stroke image data to the communication control unit 91 of the electronic blackboard 2a, which is the host device, via the communication network 9a (step S104).

When the communication control unit 91 of the electronic blackboard 2a receives the stroke data sent from the electronic blackboard 2c, the communication control unit 91 delivers the stroke data to the client units 20 of the electronic blackboards 2a, 2b, and 2c, so that the electronic blackboard 2a, The stroke image is shared between 2b and 2c. Since this process is the same as the process of steps S64 to S71, detailed description thereof will be omitted (steps S105 to S112).

<< Modification B of the embodiment >>
Subsequently, the modified example B of the embodiment will be described where it differs from the above-described embodiment. In the modification B, the process of transmitting the stroke data generated by the electronic blackboard 2b to the PC 8 will be described.

FIG. 13 is a sequence diagram showing the processing of the electronic blackboard or the PC. The stroke data generated by the electronic blackboard 2b by the processing of steps S61 to S71 of the above embodiment is delivered to the electronic blackboard 2c. Then, the stroke data delivered to the electronic blackboard 2c is deserialized and then stored in the storage unit 2000 by the communication control unit 21 of the client unit 20.

The stroke data stored in the storage unit 2000 is acquired by the communication control unit 81 of the client unit 80 and transmitted to the client unit 80 of the PC 8 (step S121). This stroke data is received by the communication control unit 81 of the client unit 80 of the PC 8. The received stroke data is displayed on the display 820 by the display control unit 82 of the client unit 80 of the PC 8 (step S122).

<< Modification C of the embodiment >>
Next, the modification C of the embodiment will be described where it differs from the above embodiment. In the modified example C, a case where the display data transmitted between the PC 8 and the electronic blackboard 2c is video data will be described.

FIG. 14 is a sequence diagram showing the processing of the electronic blackboard or the PC. The communication control unit 81 of the PC 8 transmits the video data of the conference participants taken by the camera 812 as streaming data to the client unit 80 of the electronic blackboard 2c (step S140). The video data is received by the communication control unit 81 of the electronic blackboard 2c.

The communication control unit 81 of the client unit 80 of the electronic blackboard 2c stores the received video data in the storage unit 2000. The acquisition unit 22B of the client unit 80 of the electronic blackboard 2c acquires the video data stored in the storage unit 2000 (step S141). The conversion unit 22X of the client unit 20 of the electronic blackboard 2c generates each frame data as still image data by rendering the video data acquired by the acquisition unit 22B (step S142). The conversion unit 22X of the client unit converts each frame data into text (step S143) and serializes it (step S144). Each time the serialized frame data is generated, the communication control unit 21 of the client unit transmits the generated frame data as display data to the server unit 90 of the electronic blackboard 2a (step S145).

The transmitted display data is received by the communication control unit 91 of the server unit 90 of the electronic blackboard 2a. The communication control unit 91 of the server unit 90 of the electronic blackboard 2a distributes the sent display data to the client units 20 of the electronic blackboards 2a, 2b, and 2c each time display data is sent from the electronic blackboard 2c. The client unit 20 of each of the electronic blackboards 2a, 2b, and 2c displays the distributed display data as a superimposed image each time the display data is distributed from the electronic blackboard 2a (steps S146 to S156). Since this process is the same as the process of steps S87 to S97 described above, detailed description thereof will be omitted. Since the distributed display data is still image data of each frame of the video, by continuously displaying the display data, it is possible to reproduce the video on the PC8 side on the electronic blackboards 2a, 2b, and 2c. ..

When the video data in a predetermined format can be transmitted by the communication application A11, the client unit 20 of the electronic blackboard 2c encodes the video data sent from the PC 8 into a predetermined format, and the electronic blackboard 2a It may be transmitted to the server unit 90 of. The server unit 90 of the electronic blackboard 2a distributes the video data encoded in a predetermined format sent from the electronic blackboard 2c to the client unit 20 of the electronic blackboards 2a, 2b, 2c. The client unit 20 of the electronic blackboards 2a, 2b, 2c may decode the video data sent from the server unit 90 and reproduce it as a moving image.

<< Main effects of the embodiment >>
According to the communication control method of the above embodiment, the communication control unit 21 (an example of the first communication control means) of the client unit 20 of the electronic blackboard 2c (an example of a communication terminal) is the server unit 90 (distribution server) of the electronic blackboard 2a. Control the communication with the electronic blackboard 2b (an example of the first communication terminal) via (one example) (first communication control process). The communication control unit 81 (an example of the second communication control means) of the client unit 80 of the electronic blackboard 2c controls the communication with the PC 8 (an example of the second communication terminal) (second communication control process). .. The acquisition unit 22B (an example of acquisition means) of the electronic blackboard 2c acquires the content data transmitted to and from the PC 8 in the communication by the communication control unit 81 (acquisition process). The superimposing unit 22Y (an example of the display control means) of the drawing control unit 22 of the electronic blackboard 2c controls the display of an image based on the content data distributed by the server unit 90 of the electronic blackboard 2a (display control processing). The communication control unit 21 (an example of the first communication control means) of the electronic blackboard 2c (an example of a communication terminal) transmits the content data acquired by the acquisition unit 22B to the server unit 90 of the electronic blackboard 2a. In the above embodiment, the client unit 20 can control the display of both the content data transmitted between the communication terminals by the client unit 20 and the content data transmitted between the communication terminals by the client unit 80. That is, according to the above embodiment, when a plurality of applications A11 and B10 for sharing images between communication terminals are activated, the image displayed by one application A11 is controlled by the other application B10. It is possible to prevent the image from becoming difficult to see.

The content data distributed by the server unit 90 of the electronic whiteboard 2a is acquired by the stroke data (an example of the first content data) transmitted by the electronic whiteboard 2b and the acquisition unit 22B, and is transferred to the server unit 90 of the electronic blackboard 2a. It includes display data to be transmitted (an example of second content data). The superimposing unit 22Y controls to superimpose and display the stroke data and the display data. This makes it possible to visually recognize the stroke data and the display data at the same time.

According to the modification A of the above embodiment, the content data transmitted by the client units 20 and 80 may both be stroke data. As a result, even if the stroke data cannot be directly transmitted between the client unit 20 and the client unit 80, the stroke data can be shared between the communication terminals.

According to the above embodiment, the content data transmitted by the client units 20 and 80 is different, and the conversion unit 22X (an example of the conversion means) converts the display data transmitted by the client unit 80 into text so that the client can be converted into text. It is converted into a format that can be transmitted in the communication by the unit 20. As a result, even if the content data transmitted by the client units 20 and 80 is different, the content data can be shared between the communication terminals.

According to the modification C of the above embodiment, the content data transmitted by the client unit 80 is video data. In this case, the conversion unit 22X converts the video data transmitted by the client unit 80 to and from the PC 8 by rendering it into a plurality of still image data that can be transmitted in the communication by the client unit 20. Subsequently, the server unit 90 of the electronic blackboard 2a distributes a plurality of still image data, so that the electronic blackboard 2 of the distribution destination can reproduce the moving image.

The conversion unit 22X (an example of serialization means) of the electronic blackboard 2c serializes (serializes) the content data to be transmitted to the server unit 90 of the electronic blackboard 2a. Further, the conversion unit 22X (an example of parallelization means) of the electronic blackboard 2c deserializes (parallelizes) the content data distributed by the server unit 90 of the electronic blackboard 2a. This makes it possible to reduce the load of serializing and parallelizing the content data on the server side.

The communication control unit 81 of the electronic blackboard 2c transmits the content data distributed by the server unit 90 of the electronic blackboard 2a to the PC 8. As a result, the content data on the electronic blackboard 2 side can be shared by the PC8.

<< Supplement to the embodiment >>
The communication applications A11, B10, and B11 may be recorded and distributed on a computer-readable recording medium by a file in an installable format or an executable format. Further, as another example of the above-mentioned recording medium, a CD-R (Compact Disc Recordable), a DVD (Digital Versatile Disk), a Blu-ray disc and the like can be mentioned. Further, the above-mentioned recording medium or HD (Hard Disk) in which these programs are stored can be provided as a program product in Japan or abroad.

Further, the electronic blackboard 2, the PC 8, the relay device 30, and the management system 50 in the above embodiment may be constructed by a single device, or a plurality of parts (functions or means) are divided and arbitrarily assigned. It may be constructed by the device of.

Moreover, although the electronic blackboard 2 and the PC 8 have been described above as an example of the device capable of image sharing, the present invention is not limited to this. For example, as an image sharing device, another device capable of mounting each function of the electronic blackboard 2 and the PC 8 can be used. Examples of other devices include video conferencing terminals, projectors, digital signage, text sharing devices, car navigation terminals, game machines, PDAs (Personal Digital Assistants), remote diagnostic devices, and the like.

1 Communication system 2 Electronic blackboard 3 Display 4 Electronic pen 5 USB memory 6 Notebook PC
8 PC
9a, 9b Communication network 20 Client unit 21 Communication control unit 22 Drawing control unit 22A Stroke processing unit 22B Acquisition unit 22X Conversion unit 22Y Superimposition unit 22Z Page processing unit 220 Page data storage unit 30 Relay device 50 Management system 80 Client unit 81 Communication control Unit 82 Display control unit 90 Server unit 91 Communication control unit 2000 Storage unit 8000 Storage unit

Japanese Unexamined Patent Publication No. 2015-70345

Claims (13)

A first communication control means for controlling communication with the first electronic blackboard via the distribution server,
A second communication control means for controlling communication with the second electronic blackboard ,
An acquisition means for acquiring content data transmitted to and from the second electronic blackboard in communication by the second communication control means, and an acquisition means.
It has a display control means for controlling the display of an image based on the content data distributed by the distribution server.
The first communication control means transmits the content data acquired by the acquisition means to the distribution server.
The content data distributed by the distribution server includes the first content data transmitted by the first electronic blackboard and the second content data acquired by the acquisition means and transmitted to the distribution server. And
The display control means is an electronic blackboard characterized in that it controls to superimpose and display the first content data and the second content data. The electronic blackboard according to claim 1, wherein the first content data and the second content data are stroke data. The first content data and the second content data are different content data.
The electronic blackboard according to claim 1, further comprising a conversion means for converting the second content data into a format that can be transmitted in communication by the first communication control means. The second content data is video data, and is
A conversion means for converting video data transmitted to and from the second electronic blackboard in communication by the second communication control means into a plurality of still image data that can be transmitted in communication by the first communication control means. The electronic blackboard according to claim 3, wherein the electronic blackboard is characterized by having. A serialization means for serializing the content data to be transmitted to the distribution server,
A parallelization means for parallelizing the content data distributed by the distribution server,
The electronic blackboard according to any one of claims 1 to 4, wherein the electronic blackboard is characterized by having. The electronic blackboard according to any one of claims 1 to 5, wherein the second communication control means transmits the content data distributed by the distribution server to the second electronic blackboard . A first client means having the first communication control means and executing the first application, and
The electronic blackboard according to any one of claims 1 to 6, further comprising a second communication control means and a second client means for executing a second application. The first communication control means communicates with the first electronic blackboard via the first communication network and the distribution server, and communicates with the first electronic blackboard .
Said second communication control means, electronic blackboard according to any one of claims 1 to 7, wherein the communicating with the second electronic board via the second communication network. The electronic blackboard according to any one of claims 1 to 8.
With the first electronic blackboard
With the second electronic blackboard
With the distribution server
A communication system characterized by having. The first electronic blackboard has the first communication control means.
The communication system according to claim 9, wherein the second electronic blackboard has the second communication control means. On the electronic blackboard ,
The first communication control process that controls the communication with the first electronic blackboard via the distribution server, and
A second communication control process that controls communication with the second electronic blackboard ,
In the communication by the second communication control process, the acquisition process of acquiring the content data transmitted to and from the second electronic blackboard, and the acquisition process.
A display control process for controlling the display of an image based on the content data distributed by the distribution server is executed.
In the first communication control process, the content data acquired by the acquisition process is transmitted to the distribution server.
The content data distributed by the distribution server includes the first content data transmitted by the first electronic blackboard and the second content data acquired in the acquisition process and transmitted to the distribution server. And
The display control process is a communication control method characterized in that control is performed in which the first content data and the second content data are superimposed and displayed. On the electronic blackboard ,
The first communication control process that controls the communication with the first electronic blackboard via the distribution server, and
A second communication control process that controls communication with the second electronic blackboard ,
In the communication by the second communication control process, the acquisition process of acquiring the content data transmitted to and from the second electronic blackboard, and the acquisition process.
A display control process for controlling the display of an image based on the content data distributed by the distribution server is executed.
In the first communication control process, the content data acquired by the acquisition process is transmitted to the distribution server.
The content data distributed by the distribution server includes the first content data transmitted by the first electronic blackboard and the second content data acquired in the acquisition process and transmitted to the distribution server. And
The display control process is a program characterized in that control is performed so that the first content data and the second content data are superimposed and displayed. On the electronic blackboard ,
The first communication control process that controls the communication with the first electronic blackboard via the distribution server, and
In the communication by the second communication control process, the acquisition process of acquiring the content data transmitted to and from the second electronic blackboard, and the acquisition process.
A display control process for controlling the display of an image based on the content data distributed by the distribution server is executed.
In the first communication control process, the content data acquired by the acquisition process is transmitted to the distribution server.
The content data distributed by the distribution server includes the first content data transmitted by the first electronic blackboard and the second content data acquired in the acquisition process and transmitted to the distribution server. And
The display control process is a program characterized in that control is performed so that the first content data and the second content data are superimposed and displayed.

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