JP2015115019A - Apparatus, method and program for display control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus, method and program for display control, capable of making what is displayed in a screen area of another terminal automatically scrolled interlocking with scrolling operation performed on what is displayed in a screen area of one of a plurality of connected terminals with high precision while minimizing communication volume between the terminals.SOLUTION: A display control apparatus includes; an initial scroll speed computation unit which computes and transmits a scroll speed at which a client terminal being controlled is to start auto-scrolling, from a scroll speed of an operating client terminal right after the start of scrolling operation; and a scroll speed updating unit which recomputes the scroll speed of the client terminal being controlled when an amount scrolled by the scrolling operation of the operating client terminal exceeds a threshold value, and transmits the recomputed scroll speed to keep the auto-scrolling going at the updated speed.

Description

  The present invention provides a display control for automatically scrolling a display in a screen area of another terminal in conjunction with a scroll operation performed on a display in the screen area of one terminal among a plurality of connected terminals. The present invention relates to a device, a display control method, and a display control program.

  Conventionally, when a plurality of users browse the same content using an information system, when the display content is scrolled on the terminal of one user (for example, a lecturer who conducts a lecture), the scroll operation is performed. In conjunction with this, there is a technique for automatically scrolling the display content on the terminal of another user (for example, a student who takes a lecture) (for example, Non-Patent Document 1).

  The technology described in Non-Patent Document 1 is performed on content displayed by a browser of one terminal by building a system based on a server / client model by connecting individual terminals (client terminals) to a Web server. By transmitting the information related to the scroll operation to another terminal via the Web server, the content displayed on the destination terminal is scrolled in synchronization.

  Specifically, using a communication protocol such as WebSocket (\ url {http://www.websocket.org/}), the browser information necessary for conversion of the scroll event and scroll amount of the browser in each terminal is displayed on the Web. Notify the server, execute JavaScript (\ url {https://developer.mozilla.org/en/docs/Web/JavaScript}) on the web server to convert the scroll amount, and use WebSocket on other terminal browsers. Is used to notify the conversion value of the scroll amount, and the scroll bar is moved by the browser of each terminal.

Daisuke Nakamura, Teruo Hamada, “Web browsing collaborative system that enables practical sharing of page operations”, FIT 2009 (8th Information Science and Technology Forum)

  However, in the server-client model system as described above, if the scroll operation of the display content is synchronized between a plurality of terminals, while the scroll operation is performed on a certain client terminal, the client terminal It is necessary to constantly notify the web server of information related to the scroll operation at predetermined time intervals.

  For this reason, there is a problem that the number of times of notification of operation information from the client terminal where the scroll operation is performed to the Web server becomes enormous, and the amount of communication in the system increases, which may hinder communication.

  In the system, information indicating the amount of crawl is continuously notified from the Web server to the synchronization control destination client terminal at predetermined time intervals.

  For this reason, there is a problem that the number of times of notification of information for instructing the scroll amount from the Web server to the synchronous control destination client terminal becomes enormous, and the amount of communication in the system increases, which may hinder communication.

  The present invention has been made in view of the above circumstances, and, among a plurality of connected terminals, in conjunction with a scroll operation performed on a display within the screen area of one terminal, An object of the present invention is to provide a display control device, a display control method, and a display control program capable of performing processing with high accuracy while suppressing the amount of communication with each terminal when automatically scrolling the display in the screen area. And

  In order to solve the above-described problem, the display control device of the present invention is linked to a scroll operation performed on the display in the screen area of one terminal among a plurality of connected terminals, In the display control device for automatically scrolling the display in the screen area of the terminal, the operation information related to the scroll operation executed on the one terminal is acquired at a predetermined time interval by the scroll information acquisition unit and the scroll information acquisition unit. The scroll speed immediately after the start of the scroll operation is calculated based on the operated information, and the scroll speed is calculated from the calculated scroll speed to start automatic scrolling at the other terminal and transmitted to the other terminal. Based on the operation information acquired by the start scroll speed calculation unit and the scroll information acquisition unit. Automatic scrolling that is executed at the other terminal based on the scroll change amount when the calculated scroll change amount exceeds a preset threshold value. A scroll speed update unit that calculates a speed, updates the calculated scroll speed, and transmits to the other terminal in order to continue automatic scrolling is provided.

In addition, the display control method of the present invention allows the display in the screen area of another terminal to be linked to the scroll operation executed for the display in the screen area of one terminal among a plurality of connected terminals. A display controller that automatically scrolls
Obtaining operation information related to a scroll operation executed on the one terminal at predetermined time intervals;
Based on the acquired operation information, a scroll speed immediately after the start of the scroll operation is calculated, and from the calculated scroll speed, a scroll speed is calculated to start automatic scrolling at the other terminal, and the other terminal is calculated. Based on the transmission step and the acquired operation information, the scroll change amount during the scroll operation is calculated at a predetermined time interval, and when the calculated scroll change amount exceeds a preset threshold, the threshold is exceeded. Calculating a scroll speed of automatic scrolling to be executed by the other terminal based on the scroll change amount at the time, and transmitting to the other terminal to update to the calculated scroll speed and continue the automatic scrolling. It is characterized by that.

  According to another aspect of the present invention, there is provided a display control program for configuring the display control apparatus with a computer.

  According to the display control device, the display control method, and the display control program of the present invention, among the plurality of connected terminals, in conjunction with the scroll operation executed for the display in the screen area of one terminal. The display in the screen area of another terminal can be automatically scrolled.

It is a block diagram which shows the structure of the display system using the content display control apparatus by 1st Embodiment of this invention. It is explanatory drawing which shows the display screen of the operation client terminal connected to the content display control apparatus by 1st Embodiment of this invention, and the display screen of a control destination client terminal. It is a flowchart which shows operation | movement of the scroll information acquisition part of the content display control apparatus by 1st Embodiment of this invention. It is a table | surface which shows an example of the operation information stored in operation information DB of the content display control apparatus by 1st Embodiment of this invention. It is a table | surface which shows an example of the browser information stored in browser information DB of the content display control apparatus by 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the start scroll speed calculation part in the content display control apparatus by 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the scroll speed update part in the content display control apparatus by 1st Embodiment of this invention. It is a flowchart which shows operation | movement of the scroll completion | finish process part in the content display control apparatus by 1st Embodiment of this invention. It is a block diagram which shows the structure of the display system using the content display control apparatus by 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the scroll information classification | category part of the content display control apparatus by 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the initial stage scroll amount calculation part in the content display control apparatus by 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the scroll speed estimation part in the content display control apparatus by 2nd Embodiment of this invention. It is a flowchart which shows operation | movement of the scroll speed update part in the content display control apparatus by 2nd Embodiment of this invention.

  As an embodiment of the present invention, the same content is displayed on one client terminal used by user A and another client terminal used by user B, and scroll operation performed by user A using the client terminal A display system that automatically scrolls the display on the client terminal of user B will be described in conjunction with FIG.

  Hereinafter, a client terminal on which the user A performs a scroll operation is referred to as an “operation client terminal”, a terminal that the user B browses, and a client terminal that is a scroll control destination is referred to as a “control destination client terminal”.

  In the following embodiment, the “scroll amount” at a certain time refers to the content displayed at the time during the scroll operation from the position in the content displayed immediately before the start of the scroll operation with respect to a predetermined position on the display screen. Indicates the amount of movement to the inner position.

<< First Embodiment >>
<Configuration of Display System Using Content Display Control Device according to First Embodiment>
A configuration of a display system using the content display control apparatus according to the first embodiment of the present invention will be described with reference to FIG.

  The display system 1A according to this embodiment includes an operation client terminal 10 operated by a user A (for example, a lecturer who performs a lecture) and a control destination client operated by a user B (for example, a student who takes a lecture). The terminal 20 includes a content display control device 30 </ b> A connected to the operation client terminal 10 and the control target client terminal 20.

  The operation client terminal 10 includes a monitor 11 that displays content, a browser 12 that controls display of content on the monitor 11 (the browser ID in the system is “A”, hereinafter referred to as “browser A”), When the user A performs an operation for scrolling the content displayed in the display window in the monitor 11, this is detected, and scroll information necessary for calculating the scroll amount of the scroll operation is acquired at predetermined time intervals. It has the scroll information acquisition part 13 and the scroll information transmission part 14 which transmits the scroll information acquired by the scroll information acquisition part 13 to 30 A of content display control apparatuses.

  The scroll information acquired by the scroll information acquisition unit 13 includes operation information I (t) at time t when t seconds have elapsed from the start of the scroll operation. The operation information I (t) is information that changes with time during the scroll operation. For example, in the case of a scroll operation that moves the scroll bar displayed on the screen, coordinate information indicating the operation position on the screen, mouse information In the case of the scroll operation for rotating the wheel button, the scale position information of the wheel button is used. The scroll information includes information for calculating which part of the content is displayed at a predetermined position of the operation target display window, and a scroll end notification when it is detected that the scroll operation has ended.

  The control destination client terminal 20 includes a monitor 21 that displays content, and a browser 22 that controls display of the content on the monitor 21 (the browser ID in the system is “B”, hereinafter referred to as “browser B”). A scroll speed information receiving unit 23 that receives scroll speed information related to the operation client terminal 10 from the content display control device 30A, and a display control unit 24 that scrolls the content displayed on the monitor 21 at a speed based on the received scroll speed information. And have.

  The content display control device 30A includes a scroll information acquisition unit 301, an operation information storage unit 302, a browser information storage unit 303, a start scroll speed calculation unit 304, a scroll speed update unit 305, and a scroll end processing unit 306. Have.

  The scroll information acquisition unit 301 acquires scroll information transmitted from the operation client terminal 10.

  The operation information storage unit 302 stores an operation information DB storing operation information I (t) included in the scroll information regarding the operation client terminal 10 acquired by the scroll information acquisition unit 301.

  The browser information storage unit 303 stores a browser information DB that stores browser information of the operation client terminal 10 and the control target client terminal 20. The browser information includes size information of a display window displaying the content X by each browser.

  The start scroll speed calculation unit 304 calculates the scroll speed of the scroll operation started at the operation client terminal 10 based on the operation information I immediately after the start of the scroll operation at the operation client terminal 10, and from the calculated scroll speed Then, scroll speed information at the start of automatic scrolling to be executed by the control target client terminal 20 is calculated. The calculated scroll speed information is transmitted to the control target client terminal 20.

  The scroll speed update unit 305 operates when the scroll change amount per unit time (scroll speed change amount) exceeds a preset threshold value in the scroll operation being executed on the operation client terminal 10. Based on the information in the operation information DB stored in, a new scrolling speed of automatic scrolling executed by the control destination client terminal 20 is calculated, and the new scrolling speed information is transmitted to the control destination client terminal 20 to be updated. .

  When the scroll end processing unit 306 determines that the scroll operation has ended based on the scroll information acquired by the scroll information acquiring unit 301, the scroll end processing unit 306 performs a scroll end process.

<Operation of Display System Using Content Display Control Device According to First Embodiment>
Next, in the display system 1A according to the present embodiment, the content is displayed on the monitor 21 of the control target client terminal 20 in conjunction with the scroll operation performed on the content displayed on the monitor 11 of the operation client terminal 10. The operation of scrolling the content that is currently being described will be described.

  First, as shown in FIG. 2, the browser A is activated in the operation client terminal 10 of the display system 1A to display predetermined contents in the display window in the monitor 11, and the browser B is activated in the control destination client terminal 20 to monitor. The predetermined content is displayed in the display window 21. In the present embodiment, the same content X is displayed on the monitor 11 of the operation client terminal 10 and the monitor 21 of the control target client terminal 20.

  While the content X is displayed on the display window in the monitor 11 of the operation client terminal 10, the user A performs a scroll operation on the display of the content X in the display window using a user interface device such as a mouse. Then, this operation is detected in the scroll information acquisition unit 13.

  When the scroll information acquisition unit 13 detects a scroll operation, the scroll information acquisition unit 13 acquires scroll information at a predetermined time interval (for example, 0.01 second interval).

  The scroll information acquired by the scroll information acquiring unit 13 is transmitted to the content display control device 30A by the scroll information transmitting unit 14.

  The scroll information transmitted from the operation client terminal 10 is acquired by the scroll information acquisition unit 301 of the content display control device 30A.

  A process executed by the scroll information acquisition unit 301 when the scroll information is acquired will be described with reference to a flowchart of FIG.

  First, the scroll information acquisition unit 301 acquires the scroll information transmitted from the operation client terminal 10 at time t (0.01) immediately after the start of the scroll operation (S1).

  The acquired scroll information at time t (0.01) includes operation information I (0.01) for calculating the scroll amount at time t (0.01) and information about the browser ID “browser A” to be operated. As shown in FIG. 4, it is stored in the operation information DB of the operation information storage unit 302 (S2).

  Immediately after the start of the scroll operation, the scroll information does not include a scroll end notification (“NO” in S3), and the process proceeds to step S4, where the scroll information acquisition unit 301 determines the number of records in the browser information DB in the browser information storage unit 303. It is determined whether or not it is “0” (S4).

  Here, since it is immediately after the start of the scroll operation, the number of records is “0” (“YES” in S4), and the scroll information acquisition unit 301 causes all of the connected client terminals (the operation client terminal 10 and the control target client). Each browser information is acquired from the terminal 20) and stored in the browser information DB (S5).

An example of browser information stored in the browser information DB is shown in FIG. In Figure 5, as the browser information for operating the client terminal 10, the window size wa (wa _x, wa _y) of the display window that displays the content X in the browser A is stored, as a browser information in the control destination client terminal 20, window size wb (wb _x, wb _y) of the display window that displays the content X in the browser B is stored. Here, wa _x, wb _x respectively indicate the horizontal window size of the display window, wa _y, wb _y respectively indicate the vertical direction of the window size of the display window.

  When the browser information of the browser A acquired from the operation client terminal 10 and the browser information of the browser B acquired from the control target client terminal 20 are stored in the browser information DB, the scroll information acquisition unit 301 starts the scrolling speed. The operation information I (0.01) of the browser A is notified to the calculation unit 304 (S6).

  When the scroll information immediately after the start of the scroll operation is acquired as described above, the process executed in the scroll information acquisition unit 301 ends, and the process returns to step S1 and is continued.

  The start scroll amount calculation process executed by the start scroll speed calculation unit 304 when the operation information I (0.01) of the browser A is notified by the process of step S6 described above will be described with reference to the flowchart of FIG. .

  When the operation information I (0.01) is acquired from the scroll information acquisition unit 301 (S11), the start scroll amount calculation processing is started, and the browser information of the browser A and the browser information of the unprocessed browser B other than the browser A are obtained. Obtained from the browser information DB (S12).

Next, using the acquired operation information I (0.01) of the browser A and browser information of the browsers A and B, the operation scroll amount s _{A of} the browser A at the time t (0.01) and the operation scroll amount s _A The control scroll amount s _B per unit time “0.01” in the browser B corresponding to is calculated (S13). That is, “the operation scroll amount s _A of the browser A at the time t (0.01)” indicates the scroll speed of the scroll operation in the browser A, and the control scroll amount s _B per unit time “0.01” in the browser _B is Scroll speed of scrolling controlled in browser B.

This control scroll amount s _B can be easily calculated using a known method. For example, as shown in FIG. 5, the window size of the display window displayed in the browser A is wa (wa _x , wa _y ), The scroll amount in the x-axis direction of the operation scroll amount s _A at time t (0.01) is X _A , the scroll amount in the y-axis direction is Y _A , and the window displayed in the browser B If the window size is _{wb (wb x, wb y)} , x -axis direction of the control scroll amount X _B, and the y-axis direction of the control scroll amount Y _B of the control scroll amount s _B in the browser B is represented by the following Calculated by equations (1) and (2).

  Here, if there is an unprocessed record related to the browser of another control target client terminal in the browser information DB, the processes of steps S12 and S13 are similarly executed (S14).

From the control scroll amount X _B in the x-axis direction and the control scroll amount Y _{B in the} y-axis direction at time t (0.01) for each browser (here, browser B) of all control target client terminals, an arbitrary time (t A function for calculating an approximate value of the control scroll amount s _B when ') has elapsed is calculated (S15). This function is expressed by an N-order function, for example, a linear function.

  The calculated function is transmitted to the corresponding control target client terminal 20 as scroll speed information (S16).

In the control destination client terminal 20, the function transmitted from the content display control device 30A is received by the scroll speed information receiving unit 23, and the subsequent control scroll amount s _B is determined at predetermined time intervals by the display control unit 24 based on this function. Calculated. Then, automatic scrolling of the content X displayed in the window is started at a scroll speed based on the calculated control scroll amount s _B. After the start, automatic scrolling is continued at the start scroll speed until updated to a new function.

  Hereinafter, the process executed by the scroll information acquisition unit 301 while the scroll operation is continued on the operation client terminal 10 will be described with reference to FIG.

The scroll information acquisition unit 301 continuously acquires scroll information sequentially transmitted from the operation client terminal 10 (S1), and the operation information I (0.02, 0.03... T ₁ included in the acquired scroll information. ) Is stored in the operation information DB of the operation information storage unit 302 together with the browser ID “Browser A” (S2, see FIG. 4).

  During the scroll operation, the scroll information does not include a scroll end notification (“NO” in S3), and browser information of all browsers is already stored in the browser information DB, and the record is not “0” (“4” in S4). NO ”), the process proceeds to step S7, and using the information stored in the operation information DB, the scroll change amount Δm (unit time“ 0 ”) from the previously stored operation information I (0.01) to the operation information I (0.02) acquired this time. The amount of change in the operation information I per “0.01” is calculated (S7).

  For example, the operation information I (0.02) acquired this time is stored as a record of the nth row of the operation information DB, and the operation information of the record of the nth row of the operation information DB is I (n), When the operation information of the record in the (n-1) th row is I (n-1), the scroll change amount Δm is calculated from the operation information I (n) and the operation information I (n-1).

  That is, if the display window is scrolled in the x-axis direction, the x-axis direction scroll amount included in the operation information I (n) and the x-axis direction scroll amount included in the operation information I (n−1) The scroll change amount Δm is calculated from the absolute value of the difference.

  Similarly, if the display window is scrolled in the y-axis direction, the y-axis direction scroll amount included in the operation information I (n) and the y-axis direction scroll amount included in the operation information I (n-1). The scroll change amount Δm is calculated from the absolute value of the difference between and.

  Next, it is determined whether or not the calculated scroll change amount Δm is greater than or equal to a preset threshold value M (S8). The threshold value M is a reference value for determining whether or not “the scroll speed has increased”.

  As a result of the determination, when it is determined that the scroll change amount Δm is less than the threshold value and the scroll speed is not fast (“NO” in S8), the scroll speed update unit 305 is not notified, and step S1 is performed as it is. The process is continued after returning to. That is, in the control destination client terminal 20, the automatic scroll is continued with the control scroll amount based on the function transmitted in step S16.

  As a result of the determination, when it is determined that the scroll change amount Δm is equal to or greater than the threshold value M and the scroll speed is increased (“YES” in S8), the corresponding time t and the scroll change amount Δm calculated in step S7 are displayed. Is notified to the scroll speed update unit 305 (S9).

  Thus, the process executed when the scroll information acquisition unit 301 acquires the scroll information during the scroll operation ends, and the process returns to step S1 and the process is continued.

  A scroll amount update process executed by the scroll speed update unit 305 when the time t and the scroll change amount Δm are notified by the process of step S9 described above will be described with reference to the flowchart of FIG.

When the time t and the scroll change amount Δm are acquired from the scroll information acquisition unit 301 (“YES” in S21), the scroll amount update process is started based on these, and for the corresponding browser A, t ( _A function for calculating an approximate value of the operation scroll amount s _A when an arbitrary time (t ′) elapses from (0) is calculated (S22). This function is expressed by an N-order function, for example, a linear function of s _A (t ′) = a × t ′ + b (a and b are real numbers).

  Next, browser information of the browser A and browser information of an unprocessed browser B other than the browser A are acquired from the browser information DB (S23).

Next, an operation amount of scrolling s _A browser A calculated in step S22, by using the browser information acquired browsers A and B in step S23, as in step S13, the time of the browser B A control scroll amount s _{B at} t is calculated (S24).

  Here, if there is an unprocessed record related to the browser of another control target client terminal in the browser information DB, the processes of steps S23 and S24 are similarly executed (S25).

From the control scroll amount X _B in the x-axis direction and the control scroll amount Y _{B in the} y-axis direction at time t for each browser (here, browser B) of all control target client terminals, an arbitrary time ( A new function for calculating an approximate value of the control scroll amount s _B when t ′) has elapsed is calculated (S26). This function is expressed by an N-order function, for example, a linear function.

  The calculated new function is transmitted as scroll speed information to the corresponding control target client terminal 20 (S27).

In the control destination client terminal 20, the function transmitted from the content display control device 30A is received by the scroll speed information receiving unit 23, and the subsequent control scroll amount s _B is determined at predetermined time intervals by the display control unit 24 based on this function. Calculated. Then, the scroll speed of the automatic scroll under control is updated (changed) to the scroll speed based on the control scroll amount s _B calculated by the function transmitted by the process of step S27, and the automatic scroll is continued.

  Even when the time t and the scroll change amount Δm are not acquired in step S21 (“NO” in S21), after the function is transmitted to the controlled client terminal 20 by the process of step S16 or S27, When a predetermined period set in advance has elapsed (“YES” in S28), the processes in steps S22 to S27 are executed.

  The process executed by the scroll information acquisition unit 301 when the scroll operation at the operation client terminal 10 is terminated after the automatic scroll at the control destination client terminal 20 is started will be described with reference to FIG. 3 again.

When the scroll information acquisition unit 301 acquires the scroll information at the end of the scroll operation (t ₂ ) (S 1), the operation information I (t ₂ ) included in the acquired scroll information is stored in the operation information together with the browser ID. It is stored in the operation information DB of the unit 302 (S2, see FIG. 4).

Since the scroll information includes a scroll end notification (“YES” in S3), the operation information I (t ₂ ) is notified to the scroll end processing unit 306 (S10).

A scroll end process executed by the scroll end processing unit 306 when the operation information I (t ₂ ) of the browser A is notified will be described with reference to the flowchart of FIG.

When the operation information I (t ₂ ) is acquired from the scroll information acquisition unit 301 (S31), scroll end processing is started, and browser information of the browser A and browser information of an unprocessed browser B other than the browser A are displayed in the browser. Obtained from the information DB (S32).

Next, using the operation information I (t ₂ ) of the browser A and the browser information of the browsers A and B, the time t ₂ from the time t (0) in the browser B is processed by the same process as step S13. The control scroll amount s _{B up to} is calculated (S33).

  Here, if there is an unprocessed record related to the browser of another control target client terminal in the browser information DB, the processes of steps S32 and S33 are similarly executed (S34).

The calculated control scroll amount s _B is transmitted to the corresponding control target client terminal 20 (S35).

In the control destination client terminal 20, the display in the browser B is displayed so that the content X is displayed at the same position as the display position at the end of the scroll operation in the browser A by the control scroll amount s _B transmitted in the process of step S35. Controlled and automatic scrolling is stopped.

  Further, the scroll end processing unit 306 deletes the records of the browser information DB and the operation information DB to make them empty (S36).

  In the content display control device according to the first embodiment described above, when the display on the control target client terminal is automatically scrolled in conjunction with the scroll operation on the operation client terminal, the scroll operation at the beginning of the operation start on the operation client terminal is supported. The automatic scrolling at the controlled client terminal is started at the controlled speed, and then the controlled client terminal only when the scrolling speed at the operation client terminal becomes faster than a predetermined value or when a preset period has elapsed. Since the scroll speed at the client terminal is updated, the amount of communication from the content display control apparatus to the control target client terminal can be reduced.

  In the scroll end process, the display of browser B is matched with the display position of browser A at the end of the scroll operation and the scroll control is stopped. Therefore, the display position is approximated by the scroll amount during the scroll operation. Even if there is a slight shift, the client can be stopped at the same display position on all client terminals at the end of scrolling.

<< Second Embodiment >>
<Configuration of Display System Using Content Display Control Device according to Second Embodiment>
A configuration of a display system using the content display control apparatus according to the second embodiment of the present invention will be described with reference to FIG.

  The display system 1B according to the present embodiment is the same as the configuration of the display system 1A according to the first embodiment except that the display system 1B has a content display control device 30B instead of the content display control device 30A. A description of the configuration of the client terminal 20 is omitted.

  The content display control device 30B includes a scroll information classification unit 307, an operation information storage unit 302, a browser information storage unit 303, an initial scroll amount calculation unit 308, a scroll speed estimation unit 309, a scroll speed update unit 310, A scroll end processing unit 311.

  The scroll information classifying unit 307 acquires the scroll information transmitted from the operation client terminal 10 and responds to information on the time elapsed since the scroll operation was started, a change in scroll speed, or the presence / absence of a scroll operation end notification. The necessary information is notified to the functional unit to be processed.

  The operation information storage unit 302 stores an operation information DB storing operation information I (t) included in the scroll information regarding the operation client terminal 10 acquired by the scroll information acquisition unit 301.

  The browser information storage unit 303 stores a browser information DB that stores browser information of the operation client terminal 10 and the control target client terminal 20. The browser information includes size information of a display window displaying the content X by each browser.

  The initial scroll amount calculation unit 308 is based on the operation information I acquired by the scroll information classification unit 307 from the start of the scroll operation at the operation client terminal 10 until the predetermined period T elapses. The control scroll amount at the terminal 20 is calculated at predetermined time intervals. Information on the calculated control scroll amount is transmitted to the control target client terminal 20.

  The scroll speed estimation unit 309 is configured to display the browser A at any time after the predetermined period T based on all the operation information I stored in the operation information DB when the predetermined period T comes from the start of the scroll operation. Calculate the estimated scrolling speed at. In addition, when the scroll information classification unit 307 determines that the scroll operation speed at the operation client terminal 10 has increased, the scroll information classification unit 307 recalculates the estimated scroll speed at the browser A at an arbitrary time.

  The scroll speed update unit 310 calculates the control scroll amount at the control target client terminal based on the estimated scroll amount at the operation client terminal 10 calculated by the scroll speed estimation unit 309. Information on the calculated control scroll amount is transmitted to the control target client terminal 20.

  When the scroll end processing unit 311 determines that the scroll operation has ended based on the scroll information acquired by the scroll information classifying unit 307, the scroll end processing unit 311 performs scroll end processing.

<Operation of Display System Using Content Display Control Device according to Second Embodiment>
Next, in the display system 1 </ b> B according to the present embodiment, it is displayed on the monitor 21 of the control target client terminal 20 in conjunction with the scroll operation performed on the content X displayed on the monitor 11 of the operation client terminal 10. The operation of scrolling the content X being stored will be described.

  As in the first embodiment, when a scroll operation is detected at the operation client terminal 10, scroll information about the scroll operation is acquired at predetermined time intervals and transmitted to the content display control device 30B.

  A process executed by the scroll information classification unit 307 when the scroll information is acquired will be described with reference to a flowchart of FIG.

  First, the scroll information classification unit 307 acquires scroll information transmitted from the operation client terminal 10 at time t (0.01) immediately after the start of the scroll operation (S41).

  The acquired scroll information at time t (0.01) includes operation information I (0.01) for calculating the scroll amount from time t (0) immediately before the start of the scroll operation to time t (0.01), and browser ID. The information of “Browser A” is included and stored in the operation information DB of the operation information storage unit 302 (S42).

  Next, it is determined whether or not the number of records in the browser information DB in the browser information storage unit 303 is “0” (S43).

  Here, since it is immediately after the start of the scroll operation, the number of records is “0” (“YES” in S43), and the respective browser information is acquired from all the client terminals (operation client terminal 10 and control target client terminal 20). Is stored in the browser information DB (S44). The browser information includes size information of a display window displaying the content X by each browser.

  When the browser information of the operation client terminal 10 and the control destination client terminal 20 (browser information of the browsers A and B) is stored in the browser information DB, the scroll information classification unit 307 sends the initial scroll amount calculation unit 308 to the browser A Operation information I (0.01) and time t (0.01) are notified (S45).

  The process executed in the scroll information classifying unit 307 when the scroll information immediately after the start of the scroll operation is acquired is finished, and the process returns to step S41 and is continued.

When scroll information is sequentially transmitted from the operation client terminal 10 while the scroll operation is continued, the scroll information classification unit 307 acquires the scroll information (S41). The operation information I (0.02, 0.03... T ₁ ) included in the acquired scroll information is stored in the operation information DB of the operation information storage unit 302 together with the browser ID “browser A” (S42).

  At this time, since the browser information of all browsers is already stored in the browser information DB and the record is not “0” (“NO” in S43), the process proceeds to step S46, and time t is set to a preset threshold value. It is determined whether or not T has been exceeded (S46). The threshold T is a value indicating a period set in advance in order to determine whether the time t is within the initial scroll amount calculation process target period.

  When the acquired time t does not exceed the threshold T (“NO” in S46; initial period of scroll operation start), the scroll information classification unit 307 sends the initial scroll amount calculation unit 308 to the operation information I of the browser A. (t) and time t are notified (S45).

  Refer to the flowchart of FIG. 11 for the initial scroll amount calculation process executed by the initial scroll amount calculation unit 308 when the operation information I (t) of the browser A and the time t are notified by the process of step S45 described above. To explain.

  When the operation information I (t) and the time t are acquired from the scroll information classification unit 307 (S61), an initial scroll amount calculation process is started, and it is determined whether or not the time t has reached the threshold value T. (S62).

  When the time t does not reach the threshold value T and is within the initial scroll amount calculation process target period (“NO” in S62), the browser information of the browser A and the browser information of the unprocessed browser B other than the browser A Is acquired from the browser information DB (S63).

Next, using the acquired operation information I (t) of the browser A and browser information of the browsers A and B, the operation scroll amount s _A of the browser A at the time t is calculated, and the operation scroll amount s _A control scroll amount s _B in browser B corresponding to _A is calculated (S64).

This control scroll amount s _B is calculated by equations (1) and (2), as in the case described in the first embodiment.

  Here, if there is an unprocessed record related to the browser of another control target client terminal in the browser information DB, the processes of steps S63 and S64 are similarly executed (S65).

The calculated control scroll amount s _B is transmitted to the corresponding control target client terminal 20 (S66).

In the controlled client terminal 20, the content X displayed in the window is automatically scrolled based on the control scroll amount s _B transmitted from the content display control device 30B.

  If it is determined in step S62 that the time t has reached the threshold T (“YES” in S62), the scroll speed estimation unit 309 is notified of the time t (= T) (S67).

  Thus, when the scroll information is acquired in the initial scroll amount calculation process target period, the process executed in the initial scroll amount calculation unit 308 is completed.

  The scroll amount estimation process executed by the scroll speed estimation unit 309 when the time t is notified by the process of step S67 described above will be described with reference to the flowchart of FIG.

  When the time t is acquired from the initial scroll amount calculation unit 308 (S71), browser information of the browser A and browser information of an unprocessed browser B other than the browser A are acquired from the browser information DB (S72).

Next, all the operation information I of the browser A up to the notified time t is obtained from the operation information DB, and the browser A uses the operation information I of the browser A and the browser information of the browser A. An estimated scroll amount c _A (scroll speed) at an arbitrary time t ₃ (T ≦ t ₃ ) after the period T is calculated (S73).

Here, assuming that the elapsed time and the operation scroll amount are in a proportional relationship, the estimated scroll amount c at time t ₃ based on the operation information I in the period T from the start of the scroll operation stored in the operation information DB. _A (scroll speed) is obtained as follows. For example, among the estimated scroll amount c _A, the estimated amount of scrolling x axis direction is C _Ax, when the estimated amount of scrolling in the y-axis direction is assumed to be C _Ay, estimated scroll amount C _Ax at time t _3, C _Ay but is determined from the regression line _{C Ax (t 3) = a} x × t 3 + b x, C Ay (t 3) = a y × t 3 + b y.

  A known method can be applied to the calculation of the regression line. Even when there is no proportional relationship between the elapsed time and the operation scroll amount, the time t can be obtained by using a known nonlinear regression method such as logistic regression. The estimated scroll amount (scroll speed) in the browser A at any time after = T can be easily obtained.

  When the estimated scroll speed is calculated, while the scroll operation is being performed, a predetermined period (for example, d seconds longer than the time interval for acquiring the scroll information in the scroll information acquisition unit 13 of the operation client terminal 10) ) Is notified to the browser A so that the scroll information is transmitted to the content display control device 30B (S74). Based on this notification, a scroll change amount described later is calculated based on scroll information transmitted from the operation client terminal 10 thereafter. At this time, by setting the scroll information to be transmitted to the content display control device 30B at an interval longer than the time interval at which the scroll information acquisition unit 13 acquires the scroll information, the operation client terminal 10 and the content display control device 30B are set. The amount of communication with can be reduced.

  As described above, when it is determined that the time t is the threshold value T, the process executed in the scroll speed estimation unit 309 ends.

  Next, when the time t acquired in step S46 exceeds the threshold T and the initial period of the scroll operation starts (“YES” in S46), and no scroll end notification is included (“NO” in S47). Uses the information stored in the operation information DB to calculate the scroll change amount Δm by the same process as step S7 in the first embodiment (S48).

  Next, it is determined whether or not the calculated scroll change amount Δm is greater than or equal to a preset threshold value M (S49). The threshold value M is a reference value for determining whether or not “the scroll speed has increased”.

  As a result of the determination, when it is determined that the scroll change amount Δm is equal to or greater than the threshold value M and the scroll speed has increased (“YES” in S49), the time t is notified to the scroll speed estimation unit 309 (S50). The scroll speed estimation unit 309 performs the same processing as steps S71 to S73 described above based on the operation information I of the browser A until the notified time t, and recalculates the estimated scroll speed.

  As a result of the determination in step S49, when it is determined that the scroll change amount Δm is less than the threshold value M and the scroll speed is not fast (“NO” in S49), or it is determined that the scroll speed is fast and the time After t is notified to the scroll speed estimation unit 309 (S50), the time t is notified to the scroll speed update unit 310 (S51).

  A scroll amount update process executed by the scroll speed update unit 310 when the time t is notified by the process of step S51 will be described with reference to the flowchart of FIG.

  When the time t is acquired from the scroll information classification unit 307, the browser information of the browser A and the browser information of the unprocessed browser B other than the browser A are acquired from the browser information DB (S81).

Next, using the estimated scroll speed of browser A at time t estimated by the scroll speed estimation unit 309 and the browser information of browsers A and B, the control scroll amount s _B (scroll speed of browser B at the time t) ) Is calculated (S82).

This control scroll amount s _B is calculated by equations (1) and (2), as in the case described in the first embodiment.

  Here, if there is an unprocessed record related to the browser of another control target client terminal in the browser information DB, the processes of steps S81 and S82 are similarly executed (S83).

The calculated control scroll amount s _B is transmitted to the corresponding control target client terminal 20 (S84).

In the control destination client terminal 20, the content X displayed in the window is automatically scrolled at the scroll speed based on the control scroll amount s _B transmitted from the content display control device 30B.

  After the automatic scrolling at the control target client terminal 20 is started, when the scrolling operation at the operation client terminal 10 is ended (“YES” in S47), the scroll end processing unit 311 in the first embodiment A scroll end process similar to steps S31 to S36 described above is executed.

When the time t is notified to the scroll speed estimation unit 309 by the process of step S50, the same processes as the above-described steps S71 to S73 are executed, and the estimated scroll amount c _A (scroll of the browser A at an arbitrary time t ₃ is executed. Speed) is calculated.

  In the content display control apparatus according to the second embodiment described above, when the display on the control target client terminal is automatically scrolled in conjunction with the scroll operation on the operation client terminal, the scrolling for a predetermined period at the beginning of the operation start on the operation client terminal is performed. Since the scroll speed at the operation client terminal after the period is estimated from the speed and automatic scrolling is performed at the control target client terminal based on the estimation result, the amount of communication from the operation client terminal to the content display control device is reduced. Can be made.

  In the scroll end process, since the display of browser B is matched with the display position of browser A at the end of the scroll operation and the scroll control is stopped, the display position is slightly changed by the approximation process during the scroll operation. Even if a shift occurs, all the client terminals can be stopped at the same display position at the end of scrolling.

  Moreover, it is also possible to construct a content display control program that causes the computer to function as a content display control device by programming the functional configuration of the content display control device in each of the above embodiments into a computer and incorporating it into the computer.

DESCRIPTION OF SYMBOLS 1A, 1B ... Display system 10 ... Operation client terminal 11 ... Monitor 12 ... Browser 13 ... Scroll information acquisition part 14 ... Scroll information transmission part 20 ... Control destination client terminal 21 ... Monitor 22 ... Browser 23 ... Scroll speed information reception part 24 ... Display control unit 30A, 30B ... Content display control device 301 ... Scroll information acquisition unit 302 ... Operation information storage unit 303 ... Browser information storage unit 304 ... Start scroll speed calculation unit 305 ... Scroll speed update unit 306 ... Scroll end processing unit 307 ... Scroll information classification unit 308 ... Initial scroll amount calculation unit 309 ... Scroll speed estimation unit 310 ... Scroll speed update unit 311 ... Scroll end processing unit

Claims (4)

In a display control device that automatically scrolls the display in the screen area of the other terminal in conjunction with the scroll operation performed on the display in the screen area of the one terminal among the plurality of connected terminals,
A scroll information acquisition unit that acquires operation information related to a scroll operation executed on the one terminal at predetermined time intervals;
Based on the operation information acquired by the scroll information acquisition unit, a scroll speed immediately after the start of the scroll operation is calculated, and from the calculated scroll speed, a scroll speed is calculated to start automatic scrolling in the other terminal. Starting scroll speed calculation unit to be transmitted to the other terminal,
Based on the operation information acquired by the scroll information acquisition unit, the scroll change amount during the scroll operation is calculated at predetermined time intervals, and when the calculated scroll change amount exceeds a preset threshold, the threshold is exceeded. Scroll speed update transmitted to the other terminal to calculate the scroll speed of the automatic scroll to be executed on the other terminal based on the scroll change amount at the time and update the calculated scroll speed to continue the automatic scroll And
A display control apparatus comprising: The display control apparatus according to claim 1, wherein the start scroll speed calculation unit and the scroll speed update unit calculate a scroll speed of the automatic scroll by N-order approximation. A display control device that automatically scrolls the display in the screen area of the other terminal in conjunction with the scroll operation performed on the display in the screen area of the one terminal among the plurality of connected terminals,
Obtaining operation information related to a scroll operation executed on the one terminal at predetermined time intervals;
Based on the acquired operation information, a scroll speed immediately after the start of the scroll operation is calculated, and from the calculated scroll speed, a scroll speed is calculated to start automatic scrolling at the other terminal, and the other terminal is calculated. Sending, and
Based on the acquired operation information, the scroll change amount during the scroll operation is calculated at predetermined time intervals, and when the calculated scroll change amount exceeds a preset threshold value, the scroll change amount when the threshold value is exceeded Calculating the scroll speed of the automatic scroll to be executed on the other terminal based on the above, and updating the calculated scroll speed to transmit to the other terminal to continue the automatic scroll; and
A display control method comprising:   A display control program for configuring the display control device according to claim 1 or 2 by a computer.

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