JP2014149579A - Data control device, data sharing system, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device, system, and program for allowing a user to immediately browse the content of data to be received.SOLUTION: This device is a data control device that performs control of transmitting data to an apparatus and displaying the data on the apparatus, and comprises: band detection means for detecting a band from a result of communication with the apparatus; data creation means for creating compression data from the data according to the data size of the data and the detected band; and transmission means for sequentially transmitting the compression data and the data to the apparatus, and displaying the compression data on the apparatus while transmitting the data.

Description

  The present invention relates to a data control apparatus that performs control for transmitting data to a device for display, a data sharing system that includes a plurality of devices and a data control device, and a computer-readable program for realizing the system.

  An electronic information board is known as a device for displaying data used in a meeting or the like. The electronic information board has a display equipped with a touch panel and can be connected to multiple PCs. For this reason, the electronic information board can enlarge the screen displayed on the PC and display it on the display, and can operate the PC by touching the displayed screen.

  In order to realize the operation of the PC, for example, electronic blackboard application software is provided. This software provides a function for drawing handwritten characters and the like on a display screen that functions as a blackboard via a touch panel, and a function for capturing a screen of a PC and superimposing handwritten characters on the screen. This software also provides a function to share a screen with another electronic information board connected via a network and perform a remote conference.

  If an electronic information board equipped with such a function is used, for example, at a meeting or the like, while manipulating the materials for explanation, the indicated items are appropriately written on the screen, and the contents of the screen including the writing are written as necessary. Can be recorded. Thereby, at the end of the meeting, the contents of the screen can be looked back and the contents can be reused to conclude conclusions and the like efficiently.

  A remote conference is performed between multiple stations via a network, but a certain station may participate during the conference. Since the participating station needs to obtain data such as still images and documents used in the progress of the conference at the time of the participation, the data is requested from the station participating in the conference from the beginning and transmitted. Let In the past, this data transmission hindered the progress of the conference.

  Thus, a technique has been proposed that can prevent the progress of the conference from being disturbed even when participating in a remote conference halfway (see, for example, Patent Document 1). In this technology, data transmitted during the conference is stored in the data storage control means, and when the station participating in the middle joins, the data stored from the data storage control means is automatically transmitted to the station. .

  In the above technique, when data such as writing during a meeting and still images are displayed at a station that participates in the middle, the data can be displayed only after all the data has been downloaded. If the data size of the data is large and the network environment of the station that participates on the way is poor, the user of the station takes time to view the contents of the data and cannot share information smoothly. There was a problem.

  The present invention has been made in view of the above problems, and is a data control device that performs control to transmit and display data to a device, and detects the bandwidth from the result of communication with the device. Means, data generation means for generating compressed data from the data according to the detected bandwidth, and the compressed data and the data are sequentially transmitted to the device, and the compressed data is displayed on the device while the data is being transmitted. And a data control device including a transmitting means.

  According to the present invention, even if the data size of the data is large and the network environment is inferior, the content of the data can be viewed immediately in the device that receives the data.

The figure which showed one structural example of the data sharing system. The figure which showed another structural example of the data sharing system. The figure which showed the structural example of the electronic information board shown in FIG. 1 and FIG. The functional block diagram of the electronic information board of a sponsor side, and the electronic information board of a participating side. The figure which illustrated the data format transmitted / received between the electronic information boards shown in FIG. The figure which showed the example of description of Body in the data format shown in FIG. The flowchart which illustrated the flow of the process performed with the electronic information board of the sponsor side shown in FIG. The figure which showed the example of the correspondence table. 5 is a flowchart illustrating an example of a flow of processing executed by a participating electronic information board shown in FIG. 4. The figure which showed the 1st example of the screen displayed when transmitting a request in the electronic information board of the participating side shown in FIG. The figure which showed the 2nd example of the screen displayed when transmitting a request in the electronic information board of the participating side shown in FIG. The figure which showed the 3rd example of the screen displayed when transmitting a request | requirement in the electronic information board of the participating side shown in FIG. The figure which showed the example of the screen displayed when the compressed data was received in the electronic information board of the participating side shown in FIG. The figure which showed the 1st example of the screen displayed while receiving the replicated data after receiving the compressed data in the electronic information board of the participating side shown in FIG. The figure which showed the 2nd example of the screen displayed while receiving the replicated data after receiving the compressed data in the electronic information board of the participating side shown in FIG. The figure which showed the example of the screen displayed when the replicated data were transmitted to the electronic information board of the participating side shown in FIG.

  The data sharing system of the present invention includes a plurality of devices connected by a network or a cable and a data control device. Each of the plurality of devices includes display means capable of displaying the contents of data. For this reason, an apparatus can be used as a data display apparatus provided with a display means.

  The data display device may be any device provided with display means. As the data display device, a smartphone, PDA, printer, MFP, notebook PC, desktop PC, tablet PC, digital video camera, digital camera, electronic information board, or the like can be used.

  The data control device is a device that performs control to transmit data to a device for display. The data control device may be configured as a device separate from the plurality of devices, or the data sharing system may be configured by a plurality of devices, and one of them may function as the data control device. The network may be a wired network such as a wired LAN, or a wireless network such as a wireless LAN or Bluetooth (registered trademark).

  FIG. 1 is a diagram illustrating one configuration example of a data sharing system. A data sharing system 10 shown in FIG. 1 includes three devices, two PCs 11 and 12 and one electronic information board 13. The two PCs 11 and 12 are connected to an electronic information board 13 that functions as a data control device by cables 14 and 15, respectively.

  The two PCs 11 and 12 are information processing apparatuses in which each user provides image data of an image to be displayed on the electronic information board 13. The PCs 11 and 12 include an interface that outputs an image signal as image data, and supplies the electronic information board 13 via the cables 14 and 15 at a predetermined rate (for example, 30 frames per second). Examples of the interface include a VGA (Video Graphics Array) output terminal, and examples of the cables 14 and 15 include a VGA cable.

  Here, an example of wired connection using the cables 14 and 15 has been described, but an image signal is transmitted from the PCs 11 and 12 to the electronic information board 13 by wireless communication in accordance with various wireless communication protocols such as WiFi. It is also possible.

  In addition to the above-described interfaces, the PCs 11 and 12 include a storage device that stores programs and various data for realizing functions as a PC, and a processor such as a CPU or MPU that reads and executes programs from the storage device. Examples of the program include an OS, firmware, device driver, and various application programs. As the storage device, ROM, RAM, HDD, or SSD (Solid State Drive) can be used.

  In addition, the PCs 11 and 12 can include imaging means such as a camera, input means such as a keyboard and mouse, display means such as a display, and audio output means such as a speaker. Further, the PCs 11 and 12 can include a LAN terminal as an interface for connecting to a network.

  The electronic information board 13 receives image signals from the PCs 11 and 12 and displays them on a display provided in the electronic information board 13. This display is a touch panel that allows the user to draw handwritten characters and the like, and also allows handwritten characters and the like to be drawn on the displayed screens of the PCs 11 and 12. Such memos and markers such as handwritten characters are called annotations.

  The electronic information board 13 can be connected to a network, and can share a display screen with another electronic information board connected to the network to perform a remote conference. The configuration of the electronic information board 13 will be described in detail with reference to FIG.

  In the embodiment shown in FIG. 1, two PCs 11 and 12 are connected to one electronic information board 13, but one or three or more PCs are connected to the electronic information board 13. It may be.

  FIG. 2 is a diagram showing another configuration example of the data sharing system. The data sharing system 20 includes a network 21, four PCs 22 to 25, and two electronic information boards 26 and 27. The electronic information boards 26 and 27 are connected to the network 21, the PCs 22 and 23 are connected to the electronic information board 26 via cables 28 and 29, and the PC 24 is connected to the electronic information board 27 via a cable 30. The PC 25 is directly connected to the network 21. The electronic information board 26 functions as a data control device.

  As described above, the network 21 may be a wired or wireless communication network, and a LAN, a WAN, an intranet, the Internet, or the like can be used. Communication between them can be performed using an appropriate protocol such as TCP / IP. The network 21 communicates various data among the electronic information board 26, the electronic information board 27, and the PC 25.

  The electronic information board 26 can receive the image signals from the PCs 22 and 23 connected by the cables 28 and 29 as well as the image signals from the electronic information board 27 and the PC 25 and display the same screen as those display screens. . The same applies to the electronic information board 27, and the same screen as the display screen of the electronic information board 26 or the PC 25 can be displayed.

  In the embodiment shown in FIG. 2, it is configured to be connected to each other via the network 21, but instead of the network 21, it may be a star-type connection form using a cable.

  Although the configuration example of the data sharing system is illustrated in FIGS. 1 and 2, the configuration is not limited to these configurations, and three or more electronic information boards may be connected to the network. Three or more PCs may be connected to each electronic information board, and two or more PCs may be connected to the network. Furthermore, an access point for performing wireless communication, various server devices such as a DHCP server, a database, and the like may be connected to the network.

  FIG. 3 is a diagram illustrating a hardware configuration and a functional configuration of the electronic information board. The electronic information board 100 includes an image input interface 101 and is connected to the PCs 40 and 41 via the image input interface 101.

  The image input interface 101 is an interface for receiving an image signal for forming an image displayed on the PCs 40 and 41. As this interface, for example, a DVI connector constituted by a DVI (Digital Visual Interface) terminal can be adopted. In addition, a VGA connector, an HDMI (High-Definition Multimedia Interface) connector, a Displayport connector, or the like can be adopted. The image input interface 101 supplies an image signal received from the PCs 40 and 41 via a cable such as a VGA cable to the image acquisition unit 102.

  The electronic information board 100 includes a processor 103, a ROM 104, a RAM 105, an image acquisition unit 102, a coordinate detection unit 106, a contact detection device 107, and a display unit 108. The processor 103 is an arithmetic processing unit such as a CPU or MPU, operates an OS, and executes various programs under the management of the OS. Examples of the OS include Windows (registered trademark), UNIX (registered trademark), LINUX (registered trademark), TRON, ITRON, μITRON, and the like. The program includes a program for functioning as a data control device, and a program described in various program languages can be adopted as the program. Examples of programming languages include assembler, C, C ++, Java (registered trademark), JavaScript (registered trademark), PERL, RUBY, and PYTHON.

  The ROM 104 is a non-volatile memory in which a boot program such as BIOS and EFI (Extensible Firmware Interface) is stored. The RAM 105 is a main storage device such as DRAM or SRAM, and provides an execution space for executing the program. The electronic information board 100 further includes a storage device 109 such as an HDD or an SSD, and the storage device 109 stores the program and various data.

  The processor 103 reads the program from the storage device 109 to the RAM 105 and executes the program, thereby causing the processor 103 to function as the following functional units. The function units include an event processing unit 110, an application image generation unit 111, a layout management unit 112, a drawing generation unit 113, a synthesis unit 114, and a display control unit 115. The functional units further include a snapshot generation unit 116, a snapshot storage unit 117, a snapshot transmission unit 118, and a repository management unit 119.

  The image acquisition unit 102 acquires an image signal such as a VGA signal from the PCs 40 and 41, and then analyzes the image signal. The image acquisition unit 102 extracts image information such as the resolution of an image frame that is a display image of the PCs 40 and 41 formed by the image signal and the update frequency of the image frame. Then, the image acquisition unit 102 transmits the extracted image information to the application image generation unit 111.

  The image acquisition unit 102 uses image signals acquired from the PCs 40 and 41 to form image frames which are display images of the PCs 40 and 41, respectively, and stores the image data in a video RAM 120 which is a storage unit capable of temporarily storing the image data. Save over.

  The application image generation unit 111 generates various display windows to be displayed on the display unit 108. The display window includes a display window that displays an image frame that is a display image of the PCs 40 and 41, and a display window that displays a drawing image generated by handwriting by the user. The display window also includes a display window for displaying buttons and menus for performing various settings of the electronic information board 100, and a display window for a file viewer, a web browser, and the like. The application image generation unit 111 draws the display window on the image layer where the display window is to be drawn.

  The layout management unit 112 draws the display images of the PCs 40 and 41 on the display window generated by the application image generation unit 111. When the layout management unit 112 acquires image information from the image acquisition unit 102, the layout management unit 112 acquires image data of an image frame stored in the video RAM 120. Then, the layout management unit 112 uses the image information, changes the size of the image frame to match the size of the display window generated by the application image generation unit 111, and sets the image layer on which the image frame is to be drawn. To draw.

  The coordinate detection device 107 is a device that detects contact of an object such as the drawing device 50. In this embodiment, as the coordinate detection device 107, a coordinate input / detection device using an infrared ray blocking method is employed. In the coordinate input / detection device, two light receiving and emitting devices installed at both lower ends of the display unit 108 emit a plurality of infrared rays in parallel with the display unit 108. The coordinate input / detection device receives the light reflected on the same optical path by the reflecting member provided around the display unit 108. The coordinate detection device 107 notifies the coordinate detection unit 106 of infrared identification information emitted by the two light emitting / receiving devices blocked by the object, and the coordinate detection unit 106 specifies the coordinate position that is the contact position of the object. .

  As the coordinate detection device 107, a capacitance type touch panel that identifies a contact position by detecting a change in capacitance, or a resistance film type touch panel that identifies a contact position by voltage change between two opposing resistance films is adopted. You can also In addition, as the coordinate detection device 107, an electromagnetic induction touch panel that detects electromagnetic induction caused by contact of an object in contact with the display unit 108 and identifies a contact position may be employed.

  The coordinate detection unit 106 calculates a coordinate position that is a position where the object touches the display unit 108 and issues various events. Specifically, the coordinate detection unit 106 calculates the coordinate position of the contact position of the object using the identification information of the blocked infrared ray notified by the coordinate detection device 107. As an event to be issued, there are an event (TOUCH) for notifying that an object has touched or approached, and an event (MOVE) for notifying that a contact point or an approaching point has moved while the object has touched or approached the display unit 108. Can be mentioned. An event (RELEASE) for notifying that an object has left the display unit 108 is also included as an event. These events include coordinate position information that is the coordinates of the contact position and the approach position.

  The drawing device 50 is a device that draws in contact with the coordinate detection device 107 of the electronic information board 100. The drawing device 50 may have, for example, a pen shape including a coordinate detection device 107 that detects contact of an object at the tip. In this configuration, when the coordinate detection device 107 comes into contact with the object, the drawing device 50 can transmit a contact signal indicating contact with the coordinate detection unit 106 together with the identification information of the drawing device 50.

  The drawing device 50 has a function of erasing a drawn drawing object, and can include a mode changeover switch for switching from a drawing mode to an erasing mode on a side surface or a rear end. In this erasure mode, when the coordinate detection device 107 contacts an object, a signal indicating contact and a signal indicating the erasure mode are transmitted to the coordinate detection unit 106 together with the identification information of the drawing device 50. The drawing device 50 allows the user to select an object such as a menu or button displayed on the display unit 108.

  When the drawing device 50 is brought into contact with the electronic information board 100 while the user presses the erasing mode switch, the drawing device 50 outputs a mode type signal indicating the erasing mode together with the contact signal and the identification information of the drawing device 50. Send. When the user brings the drawing device 50 into contact with the electronic information board 100 without pressing the erasing mode switch, the drawing device 50 transmits a contact signal and identification information of the drawing device 50.

  In the embodiment illustrated in FIG. 3, when the coordinate detection unit 106 receives infrared identification information from the coordinate detection device 107, the coordinate detection unit 106 calculates a coordinate position that is a contact position of an object, and then receives a contact signal from the drawing device 50. Publish various events. At this time, the coordinate detection unit 106 notifies the event processing unit 110 of information indicating the mode type (mode type information) together with the event.

  The event processing unit 110 processes an event issued by the coordinate detection unit 106. Specifically, when receiving an event from the coordinate detection unit 106, the event processing unit 110 identifies whether it is a drawing instruction event, an erasure instruction event, or a selection notification event. Then, the event processing unit 110 executes processing for each identified event.

  The drawing instruction event is an event that instructs the electronic information board 100 to perform drawing. The erase instruction event is an event for erasing an object drawn on the electronic information board 100. These events are issued due to the drawing device 50 touching the display unit 108. The selection notification event is an event indicating that various objects such as buttons and menu bars constituting the display screen displayed on the display unit 108 have been selected. This selection notification event is issued due to the drawing device 50 touching the display unit 108.

  The event processing unit 110 issues a selection notification event when the coordinate position information included in the event issued by the coordinate detection unit 106 is within the coordinate area constituting the object. Identification information is assigned to each of the drawing instruction event and the deletion instruction event, and identification information of the selected object is added to the selection notification event. Therefore, the event processing unit 110 executes various processes with reference to the identification information.

  The drawing generation unit 113 generates a drawing image drawn by the user using the drawing device 50. The drawing generation unit 113 generates an image layer in which the color at the coordinate position indicated by the coordinate position information is changed to a specific color. The drawing generation unit 113 stores the coordinate position as drawing information in a drawing information storage area in the RAM 105.

  The synthesizing unit 114 synthesizes various images. Specifically, the synthesis unit 114 synthesizes the application image layer, the image capture layer, and the handwriting layer. The application image layer is an image layer on which the application image generation unit 111 should draw an image. The image capture layer is an image layer in which the layout management unit 112 should draw the display image of the PCs 40 and 41. The handwriting layer is an image layer on which the drawing generation unit 113 should draw an image.

  The display control unit 115 controls the display unit 108 to display the combined image generated by the combining unit 114 on the display unit 108. In this embodiment, the display control unit 115 is called by the synthesis unit 114 and causes the display unit 108 to display a synthesized image. The composition unit 114 and the display control unit 115 are not limited to this, and the image layer can be synthesized and displayed on the display unit 108 at the same frequency as the update frequency of the image frame included in the image information. .

  The snapshot generation unit 116 generates a snapshot image that is a composite image of the display images of the PCs 40 and 41 and the drawing image generated by the drawing generation unit 113. Specifically, the snapshot generation unit 116 receives a selection notification event indicating that a snapshot button that instructs acquisition of a snapshot image displayed on the display unit 108 has been selected. In response, the snapshot generation unit 116 combines the image capture layer and the handwriting layer to generate a snapshot image. When the snapshot generation unit 116 generates a snapshot image, the repository management unit 119 causes the storage device 109 to save the snapshot image data (snapshot image data).

  The snapshot storage unit 117 stores the snapshot image data stored in the storage device 109 through the repository management unit 119 in an external storage device such as the USB memory 60 through the data output interface 121.

  Specifically, the snapshot storage unit 117 receives a selection notification event indicating that a snapshot storage button instructing storage of the snapshot image data displayed on the display unit 108 has been selected. Then, the snapshot storage unit 117 acquires the snapshot image data stored in the storage device 109 through the repository management unit 119. Then, the snapshot storage unit 117 outputs and stores the snapshot image data in an external storage device such as the USB memory 60 connected to the data output interface 121.

  The snapshot transmission unit 118 transmits the snapshot image data stored in the storage device 109 through the repository management unit 119 to a server (not shown) outside the electronic information board 100 through the communication control unit 122 and the communication unit 123.

  Specifically, the snapshot transmission unit 118 receives a selection notification event indicating that a snapshot transmission button for instructing transmission of snapshot image data displayed on the display unit 108 has been selected. Then, the snapshot transmission unit 118 acquires the snapshot image data stored in the storage device 109 through the repository management unit 119. Then, the snapshot transmission unit 118 outputs the snapshot image data to the communication control unit 122, and the communication control unit 122 transmits to the server or the like through the communication unit 123.

  The communication control unit 122 transmits snapshot image data to a server (not shown) outside the electronic information board 100 using a predetermined communication protocol such as FTP or SMTP via the communication unit 123. The repository management unit 119 controls the storage device 109 that stores the snapshot image data. The repository management unit 119 stores the snapshot image data in the storage device 109 according to an instruction from the snapshot generation unit 116. Further, the repository management unit 119 acquires snapshot image data from the storage device 109 according to an instruction from the snapshot storage unit 117 or the snapshot transmission unit 118, and outputs the snapshot image data to the data output interface 121 or the communication control unit 122.

  The data output interface 121 outputs the snapshot image data to an external storage device such as the USB memory 60. A USB socket can be adopted as the data output interface 121. The communication control unit 122 controls communication between the electronic information board 100 and the electronic information board 200 or the PC 42 via the network. The communication control unit 122 communicates authentication information, image data such as image frames and snapshot images, drawing information, and information such as events via the communication unit 123. The communication unit 123 is a network interface with the network. Examples of the authentication information include biometric authentication information such as a user ID for identifying a user, a password, and a fingerprint.

  FIG. 4 is a functional block diagram of the electronic information board 100 on the sponsor side of the conference that functions as the data control device and the electronic information board 200 on the participating side that intends to participate in the conference. The electronic information board 100 on the sponsor side is a data display device that has already been in a conference with another electronic information board or the like, and the electronic information board 200 on the participating side is data that intends to participate in the conference during the conference. It is a display device. These are connected via a network.

  The participation-side electronic information board 200 is an unshared data display device that does not share data shared by electronic information boards that have already participated in the conference because it has not yet participated in the conference.

  The electronic information board 100 on the sponsor side functions as a data control device, and includes a communication unit 123, a repository management unit 119, a bandwidth calculation unit 124, a duplicate content generation unit 125, a difference management unit 126, and a preview image generation unit. 127.

  The communication unit 123 functions as a receiving unit, and receives a participation request and a conference content page request from the participating electronic information board 200. The communication unit 123 also functions as a transmission unit, and transmits the conference content and the preview image to the electronic information board 200 on the participation side.

  The participation request is a request for requesting participation in the conference, and the conference content is a still image, a document, an image on which handwritten characters are drawn, an image on which handwritten characters are superimposed, or the like. If the meeting content is a document, the page request is a request for requesting an arbitrary page of the document having a plurality of pages.

  The preview image is an image for displaying in advance an image of how the image is displayed if the image is displayed. The preview image data is generated by reducing the image of the image data to generate reduced image data, and compressing the reduced image data. The preview image data is compressed data, and the data size is smaller than the image data of the same image.

  The band calculation unit 124 functions as a band detection unit, performs communication with the participating electronic information board 200 that has output the participation request, and detects the band from the communication result. The bandwidth can be calculated using, for example, Equation 1 described later.

  The duplicate content generation unit 125 functions as a data duplication unit. In response to the request received by the communication unit 123, the duplicate content generation unit 125 first obtains the conference content in progress on the electronic information board 100 on the sponsor side from the repository management unit 119. Then, the copy content generation unit 125 generates a copy (copy) of the conference content when the request is received.

  The difference management unit 126 functions as a data storage unit, and holds the content copied by the copy content generation unit 125 and the operation command of the ongoing conference content in a first-in first-out queue structure. The operation command is a command for operating the display screen. Examples of the operation include movement to the previous page or the next page.

  The preview image generation unit 127 functions as a data generation unit, and acquires image data of a screen currently displayed on the sponsoring electronic information board 100 from the difference management unit 126 in response to a participation request. Then, the preview image generation unit 127 obtains a compression rate according to the result calculated by the band calculation unit 124, compresses the image data with the compression rate, and generates a preview image.

  Data compression can be done using previously known compression algorithms. For example, the still image can be compressed by dividing the data into blocks having a certain number of pixels and subjecting the divided data to discrete cosine transform (DCT). This is an example and is not limited to this method.

  The participating electronic information board 200 includes a communication unit 201, a display unit 202, a display control unit 203, an event processing unit 204, a snapshot generation unit 205, a preview display image generation unit 206, and a preview display unit 207. Including. The display unit 202, the display control unit 203, the event processing unit 204, and the snapshot generation unit 205 have the same functions as the communication unit 123 and the display unit 108 described with reference to FIG. Therefore, only the preview display image generation unit 206 and the preview display unit 207 will be described here.

  The participation-side electronic information board 200 uses the communication unit 201 to transmit a participation request and a conference content page request to the sponsor-side electronic information board 100. Then, the participating electronic information board 200 receives the conference content and the preview image data from the sponsoring electronic information board 100.

  The preview display image generation unit 206 generates preview display image data for preview display according to the received preview image data. The preview display unit 207 displays a preview display image of the generated preview display image data in a display area independent of the received conference content.

  Here, with reference to FIG. 5, the format of the data transmitted / received by each communication part 123,201 of the electronic information board 100 of a sponsor side and the electronic information board 200 of a participating side is demonstrated. TO and FROM contain a destination address and a source address, respectively. These may be any of an IP address, URI (RFC2396), URL (RFC1738), XMPP Address (RFC6122), and UUID (RFC4122).

  The Sequence-Number (sequence number) is an ID for uniquely identifying a message. As this sequence number, a number incremented by 1 is used for each generated message. Reference refers to Sequence-Number and is an ID used when responding. Method is an operation on an object. Here, operations such as Join (participation) are illustrated.

  Body includes content such as strokes such as handwritten lines and still images, and includes page ID, total number of pages, size of conference content, bandwidth information (bit / second), and the like. The still image data is, for example, a JPEG (Joint Photograph Expert Group) file. The page ID is identification information for identifying a page. The Body may be a text format such as XML or JSON, or may be a binary format that represents data in 8 bits.

  FIG. 6 shows an example of a body in which content including five strokes is described in XML and JSON. FIG. 6A shows an example of a body described in XML, and FIG. 6B shows an example of a body described in JSON. Body can be described in this text format.

  With reference to FIG. 7 and FIG. 9, the process performed by the sponsoring electronic information board 100 and the process performed by the participating electronic information board 200 will be described in detail. In this description, the correspondence tables and screens shown in FIGS. 8 and 10 to 16 are also referred to.

  First, with reference to FIG. 7, the process performed by the electronic information board 100 on the sponsor side will be described. The sponsoring electronic information board 100 starts processing from step 700, and in step 705, the communication unit 123 receives a participation request from the participating electronic information board 200.

  In step 710, the duplicate content generation unit 125 acquires the ongoing conference content from the repository management unit 119 and generates a copy of the conference content. In step 715, the sequence counter included in the electronic information board 100 on the sponsor side is initialized with the current sequence number of the ongoing conference content.

  In step 720, the band calculation unit 124 communicates with the participating electronic information board 200 using the communication unit 123, and calculates the band from the information obtained by the communication. Here, in the band B, if the data size transmitted in communication is D, and the round trip time Δt between the electronic information boards 200 on the participation side, a result approximated by the following equation 1 can be obtained.

  According to the bandwidth B obtained by the above equation 1 and the like, the compression rate is determined using a correspondence table in which the bandwidth shown in FIG. 8 is associated with the data compression level (compression rate). For this compression rate, the coefficient of the Quantity Table published by the Independent Jpeg Group (http://www.ijg.org/) can be used.

  In step 725, the compression rate is acquired using the correspondence table. For example, when the bandwidth is calculated as 150 kbps, since this bandwidth is in the range of 128 kbps or more and less than 256 kbps, 40% is acquired as the compression rate.

  In step 730, the preview image generation unit 127 JPEG-compresses the display screen data of the ongoing conference content according to the acquired compression rate, and generates a preview image. In step 735, the total number of pages of conference content in progress is acquired. In step 740, the communication unit 123 transmits a response including preview image data and information on the total number of pages to the participating electronic information board 200.

  In step 745, it is determined whether a page request for requesting an arbitrary page has been received from the electronic information board 200 on the participating side. For example, this determination can be made depending on whether a page request is received within a certain time. If it is determined that it has been received, the process proceeds to step 750, and the page specified by the page request is acquired from the copied conference content. In step 755, the copied conference content is transmitted to the participating electronic information board 200 as a page response, and the process returns to step 745.

  If it is determined in step 745 that it has not been received, the process proceeds to step 760, where it is determined whether an ACK indicating that the requested content has been received has been received. If it has not been received, the process proceeds to step 790 and the process is terminated. This is because the fact that the ACK is not received means that the requested content cannot be transmitted from the sponsor side to the participating side.

  On the other hand, if received, the conference content copied in step 765 is discarded, and in step 770, it is determined whether the value of the sequence counter is less than the sequence number of the conference currently in progress. The reason why the conference content is discarded in step 765 is that there is no more page request, so the content is not transmitted and does not need to be retained. In addition, if it is held, the memory usage rate increases, and other processes cannot be executed efficiently.

  The value of the sequence counter increases every time the content held in the difference management unit 126 is transmitted to the participating electronic information board 200. If there is a content operation command in the ongoing conference sequence, this operation command is also transmitted. For this reason, at this time, the current sequence number becomes a smaller value by the amount of transmission of this operation command.

  If it is determined in step 770 that the sequence number is less than that of the currently ongoing conference, there is an operation command to be transmitted, so the process proceeds to step 775, and the sequence counter value is first incremented by one. In step 780, the communication unit 123 acquires one operation command from the difference management unit 126, and transmits the operation command to the participating electronic information board 200 in step 785. Then, the process returns to step 770 again.

  If it is determined in step 770 that the conference sequence number is not less than the current ongoing sequence number, that is, if it is determined to be the same as the sequence number, there is no operation command to be transmitted, so the process proceeds to step 790 and the process is terminated.

  Next, with reference to FIG. 9 to FIG. 16, processing executed in the electronic information board 200 on the participation side will be described in detail. When participating in the conference, a screen as shown in FIG. 10 is displayed on the electronic information board 200 on the participating side, and the user presses the button by touching the Join button in the screen. As a result, the processing starts from step 900 shown in FIG.

  When the above Join button is pressed, a contact list for selecting the sponsor-side electronic information board 100 as shown in FIG. 11 is displayed. Therefore, one electronic information board “host1” in this list can be selected. If selected, the IP address of “host1” is automatically entered in the IP address column. The user presses a connection button to establish a connection with the selected electronic information board.

  On the screen shown in FIG. 11, two tabs, a contact list and direct input, can be selected. When this direct input tab is touched and selected, an input screen as shown in FIG. 12 is displayed. The input screen shown in FIG. 12 is a screen on which the IP address of the electronic information board 100 on the sponsor side can be directly input. The user can select this screen when he / she knows the IP address of the electronic information board 100 on the sponsor side and wants to obtain conference content from the electronic information board 100.

  When the selection of the electronic information board 100 or the input of the IP address is completed, in step 905, the communication unit 201 transmits a participation request to the selected electronic information board 100 or the electronic information board 100 having the designated IP address. .

  The electronic information board 100 on the sponsor side that has received the participation request performs the processing of Steps 710 to 735 shown in FIG. 7 and transmits a response in Step 740. The participating electronic information board 200 receives the response in step 910 and displays the preview image on the preview display unit 207 in step 915 using the preview image data included in the response. FIG. 13 shows the state at this time. In FIG. 13, a display window is displayed on the right side of the display area that is smaller than the display area, and a preview image is displayed in the display window.

  The preview image includes handwritten characters, and a message indicating that the first page is being read is displayed above the preview image. In addition, a cancel button is displayed in this display window so that the display of the preview image can be erased.

  Next, in step 920, a page reception counter that is incremented each time a page of conference content is received is initialized to zero. In step 925, it is determined whether or not the value of the page reception counter matches the total number of pages included in the response. If they do not match, all the pages have not been received yet, so the process proceeds to step 930, and a page request for requesting a page that has not been received yet is transmitted to the electronic information board 100 on the sponsor side.

  In step 935, a page response is received from the electronic information board 100 on the sponsor side, and in step 940, the page is displayed on the screen using the page data of the page included in the page response. In step 945, the value of the page reception counter is incremented by 1, and the process returns to step 925.

  If it is determined in step 925 that they match, since all the conference content pages have been received, the preview image is not necessary. For this reason, the display of the preview image is erased in step 950, and ACK indicating that all the images have been received is transmitted to the electronic information board 100 on the sponsor side in step 955. In response, the electronic information board 100 on the sponsor side transmits one operation command, but the electronic information board 200 on the participating side determines in step 960 whether or not the operation command has been received.

  If it is received in step 960, the process proceeds to step 965, and the operation in the operation command that becomes the difference is reflected on the currently displayed screen. Then, the process returns to step 960 again to determine whether another operation command has been received. On the other hand, if no operation command is received in step 960, there is no information to be reflected on the screen, so the process proceeds to step 970, and this process is terminated.

  If the total number of pages of conference content is 3, the organizer generates a preview image of the third page that is currently displayed, and transmits a response of 3 pages. The participation side receives the response and displays the preview image of the third page currently displayed as shown in FIG.

  FIG. 14 is a diagram illustrating a screen on which the participating side receives and displays the content of the first page. It is shown that the content of the first page is displayed together with the preview image of the third page currently displayed on the sponsor side. At this time, the participating side can transmit a page request for requesting the content of the second page.

  FIG. 15 is a diagram exemplifying a screen displayed by the participating party in response to a page response to the page request. Also in this case, the content is displayed together with the preview image of the third page currently displayed on the sponsor side. However, the content at this time is the content of the second page because the content of the second page is received in the page response. Also at this time, the participating side can transmit a page request for requesting the content of the remaining third page.

  FIG. 16 is a diagram exemplifying a screen displayed by the participant in response to a page response to the page request. In this case, there is no preview image, and only the third page is displayed. This is because it is not necessary to display a preview image because the same screen as that displayed on the organizer side is displayed. In response to the fact that the participating electronic information board 200 has received a copy of the content from the organizer, this screen deletes the display of the preview image on the screen and displays the received copy of the content on the screen. It is a thing.

  As mentioned above, a preview image with a small data size is transmitted in advance, and then the content is transmitted, so even if you join the conference halfway, you can immediately display the preview image and immediately view the contents of the content Is possible.

  The present invention has been described with the above-described embodiment as a data control device and a data sharing system including the data control device, but the present invention is not limited to the above-described embodiment. The present invention can be modified within a range that can be conceived by those skilled in the art, such as other embodiments, additions, modifications, and deletions. It is included in the scope of the invention.

  Therefore, the present invention can also provide a method including processing steps executed by the data sharing system, a computer-readable program for executing the method, a recording medium on which the program is recorded, and the like. is there.

DESCRIPTION OF SYMBOLS 10, 20 ... Data sharing system 11, 12, 22-25, 40-42 ... PC, 13, 26, 27, 100, 200 ... Electronic information board, 14, 15, 28-30 ... Cable, 50 ... Drawing apparatus , 60 ... USB memory, 101 ... image input interface, 102 ... image acquisition unit, 103 ... processor, 104 ... ROM, 105 ... RAM, 106 ... coordinate detection unit, 107 ... coordinate detection device, 108 ... display unit, 109 ... memory 110, event processing unit, 111 ... application image generation unit, 112 ... layout management unit, 113 ... drawing generation unit, 114 ... composition unit, 115 ... display control unit, 116 ... snapshot generation unit, 117 ... snapshot storage 118: Snapshot transmission unit, 119 ... Repository management unit, 120 ... Video RAM, 121 ... Data output interface, DESCRIPTION OF SYMBOLS 22 ... Communication control part, 123 ... Communication part, 124 ... Band calculation part, 125 ... Duplicate content generation part, 126 ... Difference management part, 127 ... Preview image generation part, 201 ... Communication part, 202 ... Display part, 203 ... Display Control unit 204... Event processing unit 205. Snapshot generation unit 206 206 Preview display image generation unit 207 Preview display unit

JP 7-322230 A

Claims (7)

A data control device that performs control to transmit and display data to a device,
Band detecting means for detecting a band from a result of communication with the device;
Data generating means for generating compressed data from the data according to the detected band;
A data control apparatus comprising: transmission means for sequentially transmitting the compressed data and the data to a device, and displaying the compressed data on the device while transmitting the data.   Storage means for storing a correspondence table in which bandwidths and data compression rates are associated with each other, wherein the data generation means refers to the correspondence table, determines the compression rate from the detected bandwidth, and the compression rate The data control device according to claim 1, wherein the data is compressed by the method.   The data is image data, and the data generation unit reduces the image of the image data to generate reduced image data, and compresses the reduced image data to generate the compressed data. 2. The data control device according to 2.   The data control device is shared among a plurality of data display devices, and receives the request from an unshared data display device that does not share the image data, which is the device, with respect to the displayed screen image data. The data control device according to any one of claims 1 to 3, wherein control is performed to transmit and display to the shared data display device.   A plurality of data display devices that share data and display it on the screen, an unshared data display device that does not share the data, obtain the data, and send a copy of the data to the unshared data display device A data sharing system including the data control device according to any one of claims 1 to 3, wherein the data control device performs control to be displayed.   In response to receiving the copy of the data from the data control device, the unshared data display device displays the compressed data generated by compressing the data on the screen of the unshared data display device. The data sharing system according to claim 5, wherein the data sharing system is erased and the data is displayed on the screen. A computer readable program for controlling data to be transmitted to a device for display,
Detecting a band from a result of communication with the device; and
Generating compressed data from the data according to the detected band;
A program for transmitting the compressed data and the data to a device in order, and causing the device to display the compressed data while transmitting the data.