WO2016024329A1 - System and method for sharing handwriting information - Google Patents

Abstract

A system in an embodiment receives, from a first electronic device, a plurality of point data that correspond to handwriting strokes inputted to said first electronic device. As said handwriting strokes are being inputted, the point data are sequentially transmitted from the first electronic device in chronological order. The system stores the point data, together with timestamps, on a storage medium. If a third electronic device logs into a service midway through, the system sequentially transmits the first point data stored on the storage medium to the third electronic device in chronological order using timing based on the timestamps corresponding to the respective first point data.

Description

System and method for sharing handwritten information

Embodiment described here is related with the technique for sharing handwritten information.

In recent years, various electronic devices such as tablets, PDAs, and smartphones have been developed. Many electronic devices of this type are equipped with a touch screen display to facilitate an input operation by a user.

Recently, technology for sharing handwritten information has also been developed. The technology for sharing handwritten information is useful for business scenes such as meetings.

JP 2014-44471 A

However, in the past, no technology has been considered for presenting handwritten information from another electronic device to the user without a sense of incongruity.

An object of one aspect of the present invention is to provide a system and method that can present handwritten information to a user without a sense of incongruity.

According to the embodiment, the system includes a receiving unit, a processing unit, and a transmitting unit. The receiving means receives, from the first electronic device, a plurality of point data corresponding to strokes input by handwriting in the first electronic device logged into a service that can share handwritten information. The plurality of point data are sequentially transmitted from the first electronic device in chronological order while the stroke is input by handwriting. The processing means executes processing for storing the plurality of point data in a storage medium together with a time stamp indicating the input time or reception time of the plurality of point data. The transmission means sequentially transmits the plurality of point data in time series order to a second electronic device logged in to the service. When a third electronic device logs in to the service from the middle, the processing means stores a plurality of first point data stored in the storage medium before the third electronic device logs in the plurality of first items. Processing for sequentially transmitting to the third electronic device in chronological order is executed at a timing based on a time stamp corresponding to each point data.

FIG. 1 is an exemplary perspective view showing an appearance of an electronic apparatus according to the embodiment. FIG. 2 is an exemplary diagram illustrating a connection between electronic devices using the handwriting sharing service. FIG. 3 is an exemplary diagram for explaining an outline of a data flow between the electronic device (handwriting collaboration server system) of FIG. 1 and other electronic devices. FIG. 4 is an exemplary diagram showing a screen (canvas) for sharing handwritten information among a plurality of electronic devices. FIG. 5 is an exemplary diagram illustrating a handwritten document handwritten on the touch screen display of the electronic apparatus of FIG. 1. FIG. 6 is an exemplary diagram for explaining a process to be executed when another user joins the handwriting sharing service from the middle. FIG. 7 is an exemplary diagram for explaining the flow of handwritten data between the electronic device of FIG. 1 and other electronic devices. FIG. 8 is an exemplary diagram showing a state in which a plurality of point data is transmitted one by one during stroke handwriting input. FIG. 9 is an exemplary diagram showing an example of handwritten data drawn on a canvas. 10 is an exemplary diagram showing handwritten data stored in the database of the electronic device of FIG. FIG. 11 is an exemplary diagram showing a data structure of a database of the electronic device of FIG. FIG. 12 is an exemplary diagram showing a state in which a plurality of point data stored in the database is replayed at double speed. FIG. 13 is an exemplary diagram showing a process for determining the magnification of the transmission rate with respect to the reception rate. FIG. 14 is an exemplary block diagram showing a configuration of the electronic apparatus of FIG. FIG. 15 is an exemplary block diagram showing a configuration of a handwriting sharing application program executed by the electronic device of FIG. FIG. 16 is an exemplary flowchart showing a procedure of handwritten data distribution processing executed by the electronic apparatus of FIG. FIG. 17 is an exemplary flowchart showing a procedure of point data storage processing executed by the electronic apparatus of FIG. FIG. 18 is an exemplary flowchart showing a replay processing procedure executed by the electronic apparatus of FIG. FIG. 19 is an exemplary flowchart showing a procedure of point data transmission processing for replay, which is executed by the electronic apparatus of FIG. FIG. 20 is an exemplary flowchart showing a procedure of processing executed by each participant's device. FIG. 21 is an exemplary diagram for explaining a menu displayed on the canvas. FIG. 22 is an exemplary diagram for explaining a timeline displayed on the canvas. FIG. 23 is an exemplary diagram for explaining the rookeback process.

Hereinafter, embodiments will be described with reference to the drawings.
FIG. 1 is a perspective view illustrating an external appearance of an electronic apparatus according to an embodiment. This electronic device is, for example, a pen-based portable electronic device that can execute handwriting input using a pen (stylus) or a finger. This electronic device can be realized as a tablet computer, a notebook personal computer, a smartphone, a PDA, or the like. Below, the case where this electronic device is implement | achieved as the tablet computer 10 is assumed. The tablet computer 10 is a portable electronic device that is also called a tablet or a slate computer. As shown in FIG. 1, the tablet computer 10 includes a main body 11 and a touch screen display 17. The touch screen display 17 is attached to be superposed on the upper surface of the main body 11.

The main body 11 has a thin box-shaped housing. The touch screen display 17 incorporates a flat panel display and a sensor. The sensor detects the position (contact position) on the screen of the flat panel display that is in contact with the pen or finger. The flat panel display may be, for example, a liquid crystal display (LCD). As the sensor, for example, a capacitive touch panel, an electromagnetic induction digitizer, or the like can be used. In the following, it is assumed that two types of sensors, a digitizer and a touch panel, are incorporated in the touch screen display 17.

The touch screen display 17 can detect the position on the screen in contact with the finger, and can also detect the position on the screen in contact with the pen. The pen 100 may be, for example, an electromagnetic induction pen (digitizer pen). The user can write characters on the screen of the touch screen display 17 using the pen 100. During the handwriting input operation, the locus of movement of the pen 100 on the screen, that is, the stroke input by handwriting is drawn on the screen in real time. The locus of movement of the pen 100 while the pen 100 is in contact with the screen corresponds to one stroke. A set of many strokes corresponding to handwritten characters or figures constitutes a handwritten document.

A single stroke is represented by a set of a plurality of point data corresponding to each of a plurality of points on this stroke. Each point data indicates the coordinates (X coordinate, Y coordinate) of the corresponding point.

Furthermore, the tablet computer 10 has a handwriting collaboration function. This handwriting collaboration function executes a handwriting sharing service capable of sharing handwritten information among a plurality of electronic devices. The handwriting sharing service enables users of each electronic device to browse shared handwritten information and edit handwritten information through collaborative work with users of other electronic devices.

This handwriting sharing service distributes handwritten data input by handwriting on an electronic device participating (logged in) to the other electronic devices participating (logged in) in real time. Thereby, the contents of the handwritten document displayed on the display screens of these electronic devices can be synchronized. Strokes handwritten by different users may be displayed in different forms (eg, different colors, different pen types, etc.).

The handwriting sharing service is used by a group of multiple people. The group of a plurality of people who use the handwriting sharing service may include one group owner (organizer) and one or more participants.

FIG. 2 shows a connection example between electronic devices using the handwriting sharing service.
The electronic device 10A is a tablet computer used by the user A. The electronic device 10B is a tablet computer used by the user B. The electronic device 10 </ b> C is a tablet computer used by the user C. Each of these electronic devices 10A, 10B, and 10C has a handwriting collaboration function equivalent to that of the tablet computer 10 of the present embodiment.

The electronic devices 10A, 10B, and 10C are connected to each other via a wired network or a wireless network. In the following, it is assumed that the electronic devices 10A, 10B, and 10C are connected to each other via a wireless network. As a method for wirelessly connecting electronic devices 10A, 10B, and 10C to each other, any wireless connection standard capable of wirelessly connecting a plurality of devices to each other can be used. For example, Bluetooth (registered trademark), Wi-Fi Direct (registered trademark), or the like may be used.

Any one of the electronic devices 10A, 10B, and 10C can function as a server (handwriting collaboration server system) configured to manage the handwriting sharing service. The electronic device of the group owner may serve as a server (handwriting collaboration server system). The group owner is equivalent to the organizer of the handwriting sharing service.

In this server (handwriting collaboration server system), each electronic device requesting participation in the handwriting sharing service participates in the handwriting sharing service (group), that is, logs in to the handwriting collaboration server system (handwriting sharing service). , It may be determined whether or not to allow. Only a device that has received permission for participation (login) from the handwriting collaboration server system may be permitted to log in to the handwriting sharing service, that is, to participate in this group.

Here, as a method for each device to log in to the handwriting collaboration server system (handwriting sharing service), a method of logging in to the handwriting sharing service using the ID (account) of the device itself may be used. Or you may use the method of logging in to a handwriting sharing service using ID (account) of the user who uses this apparatus. That is, the login and logout for the handwriting sharing service may be either login and logout using the ID (account) of the electronic device itself or login and logout using the user ID (account).

Now, assume that the electronic devices 10A, 10B, and 10C are logged in to the handwriting sharing service, that is, the electronic devices 10A, 10B, and 10C are participating in the same handwriting sharing service. In each of electronic devices 10A, 10B, and 10C, a handwriting sharing screen (canvas) for viewing shared handwritten information is displayed. The handwriting sharing screen (canvas) is used as a display area common to the electronic devices 10A, 10B, and 10C. This handwritten sharing screen (canvas) enables visual communication between the electronic devices 10A, 10B, and 10C. Visual communication allows handwritten information and various other electronic documents to be exchanged between devices.

Handwritten data input by each of the users A, B, and C in his / her electronic device is not only displayed on the handwriting sharing screen (canvas) of his / her electronic device, but also handwritten and shared by the electronic devices of other users. It is also reflected on the screen (canvas) in real time. As a result, information (handwritten characters, handwritten figures, etc.) input by handwriting by each of the users A, B, and C can be exchanged and shared between the users A, B, and C.

Furthermore, the electronic devices 10A, 10B, and 10C can display the same content such as conference materials on the canvas. In this case, handwritten data input by handwriting in each electronic device is displayed on this content. Users A, B, and C can exchange and share handwritten characters, handwritten figures, and the like handwritten on the content among the users A, B, and C while viewing the same content.

FIG. 3 shows a data flow between the handwritten collaboration server system and each electronic device.

3, it is assumed that the electronic device 10A operates as a handwriting collaboration server system. That is, the user A of the electronic device 10A is a group owner, the user B of the electronic device 10B is a participant (participant 1), and the user C of the electronic device 10C is another participant (participant 2).

The handwriting collaboration server system (electronic device 10A) receives handwritten data input by handwriting in the electronic device 10B from the electronic device 10B. The handwriting collaboration server system (electronic device 10A) receives handwritten data input by handwriting in the electronic device 10C from the electronic device 10C.

Further, the handwriting collaboration server system (electronic device 10A) transmits handwritten data input by handwriting in the electronic device 10A and handwritten data received from the electronic device 10C to the electronic device 10B. Furthermore, the handwriting collaboration server system (electronic device 10A) transmits handwritten data input by handwriting in the electronic device 10A and handwritten data received from the electronic device 10B to the electronic device 10C.

Therefore, on the display of the electronic device 10A, not only the handwritten data of the group owner is displayed, but also the handwritten data of the participant 1 and further the handwritten data of the participant 2 are displayed.

Similarly, on the display of the electronic device 10B, not only the handwritten data of the participant 1 is displayed, but also the handwritten data of the group owner and further the handwritten data of the participant 2 are displayed.

Similarly, on the display of the electronic device 10C, not only the handwritten data of the participant 2 is displayed, but also the handwritten data of the group owner and further the handwritten data of the participant 1 are displayed.

The electronic device 10 </ b> A stores handwritten data input by handwriting in each electronic device in the database 12. This database 12 is used to manage handwritten information created and edited by collaborative work.

FIG. 4 shows an example of a handwriting sharing screen (canvas). In the canvas 30A of each electronic device, a transparent layer (handwriting layer) 30B capable of handwriting input is set. The handwritten data of each user is displayed on the handwriting layer 30B.

Regarding the electronic device 10B, in the canvas 30A of the electronic device 10B, handwritten data 40 input by the participant 1 using the pen 100B on the canvas 30A is displayed. Furthermore, on the canvas 30A, handwritten data input by handwriting in other electronic devices is displayed. The handwritten data input by handwriting in each of the other electronic devices includes handwritten data 42 input by handwriting in the electronic device 10C of the participant 2 and handwritten data 44 input by handwriting in the electronic device 10A of the group owner. .

Next, the stroke and point data will be described with reference to FIG.

In FIG. 5, it is assumed that the handwritten character string “ABC” is handwritten in the order of “A”, “B”, and “C”.

The handwritten character “A” is expressed by two strokes (“∧” shape trajectory, “−” shape trajectory) handwritten using the pen 100 or the like.

While the pen 100 is moving, the trajectory of the “∧” -shaped pen 100 is sampled in real time. Thereby, a plurality of point data (a plurality of coordinate data) PD11, PD12,... PD1m corresponding to the plurality of points on the trajectory of the “∧” -shaped pen 100 are obtained one after another. For example, point data indicating a new position may be obtained each time the position of the pen 100 on the screen moves by a predetermined amount. In FIG. 5, the density of the point data is drawn roughly for the sake of simplicity, but actually, a plurality of point data can be obtained at a higher density. These point data PD11, PD12,... PD1m are used to draw the trajectory of the “∧” -shaped pen 100 on the screen. The locus of the “∧” -shaped pen 100 is drawn on the screen in real time so as to follow the movement of the pen 100.

Similarly, the trajectory of the “-” shaped pen 100 is also sampled in real time while the pen 100 is moving. As a result, a plurality of point data (a plurality of coordinate data) PD21, PD22,... PD2n corresponding to a plurality of points on the trajectory of the “−” shaped pen 100 are obtained one after another.

The handwritten character “B” is expressed by two strokes handwritten using the pen 100 or the like. The handwritten character “C” is expressed by one stroke handwritten using the pen 100 or the like.

Next, the data flow for the handwritten information sharing service will be described with reference to FIG.

In FIG. 6, it is assumed that a group of three persons, a group owner (electronic device 10A), a participant 1 (electronic device 10B), and a participant 2 (electronic device 10C) hold discussion. The group owner, participant 1, and participant 2 may gather in the conference room with their own electronic devices 10A, 10B, 10C. Then, the group owner, the participant 1, and the participant 2 can discuss while looking at the canvas of their own electronic devices or while handwriting on the canvas.

(1) Discussion by Handwriting with a Group of Three Handwritten data (handwritten characters, handwritten figures, etc.) handwritten by the participant 1 on the canvas of the electronic device 10B is transmitted to the electronic device 10A. Further, the handwritten data of the participant 1 is transferred to the electronic device 10C by the electronic device 10A. Therefore, the handwritten data of the participant 1 is displayed on each of the electronic device 10B, the electronic device 10A, and the electronic device 10C.

Similarly, the handwritten data input by handwriting on the canvas of the electronic device 10C by the participant 2 is also transmitted to the electronic device 10A and further transferred to the electronic device 10B by the electronic device 10A. Therefore, the handwritten data of the participant 2 is displayed on the respective canvases of the electronic device 10B, the electronic device 10A, and the electronic device 10C.

Furthermore, handwritten data input by handwriting on the canvas of the electronic device 10A by the group owner is transmitted to the electronic device 10B and the electronic device 10C. Therefore, the handwritten information of the group owner is also displayed on each canvas of the electronic device 10A, the electronic device 10B, and the electronic device 10C.

In this way, a group of three people can hold a discussion (conference) while looking at the contents of the canvas reflecting the handwriting of these three people.

(2) Request to join group under discussion After the handwritten information sharing service is started, the electronic device 10D of another user (participant 3) may request participation (login) to the handwritten information sharing service. Absent. Such a situation may occur, for example, when the participant 3 arrives at the conference room later and joins an already started discussion.

(3) The group owner (electronic device 10A) that has received the request for participation (login) can permit the participant 3 to participate (login) to the group of the handwritten information sharing service. In this case, the electronic device 10A may transmit the content of the current handwritten information (the content of the discussion so far) to the electronic device 10D.

(4) As a result, the electronic device 10D can draw the contents of the current handwritten information on the canvas of the electronic device 10D.

(5) However, only by looking at the contents of the current handwritten information, Participant 3 may not be able to grasp the progress of the discussion so far, that is, how the current handwritten information has been constructed. There is.

Therefore, the handwriting collaboration function of the present embodiment has a new function for presenting in an easy-to-understand manner how the current handwritten information has been constructed to participants who have joined the handwritten information sharing service midway. I have.

The following outlines this new function.

As a method for transmitting handwritten data input by handwriting in a certain electronic device to another electronic device, a method of transmitting the entire stroke data (stroke data) at a time every time one stroke is input by handwriting Can be used.

However, in this case, the stroke data is not transmitted until the stroke handwriting input is completed, that is, until the contact between the pen and the screen is released by lifting the pen from the screen. Therefore, for example, when three strokes are sequentially handwritten input in a certain electronic device, first, after completing the first stroke handwriting input, the shape of the entire first stroke is on the canvas of another electronic device. Are displayed at once. Then, after the handwriting input of the second stroke is completed, the shape of the entire second stroke is displayed at once on the canvas of another electronic device. After the handwriting input of the third stroke is completed, the shape of the entire third stroke is displayed at once on the canvas of another electronic device.

Thus, on the canvas of another electronic device, the state in which individual strokes are written (the state in which lines are extended) is not reproduced, and only the shape of each stroke for which handwriting input has been completed is displayed at a time. .

On the other hand, in an electronic device in which handwriting input of a stroke is actually performed, a state in which the stroke is written (a state in which a line extends) is displayed in real time.

In this embodiment, in order to be able to reproduce the state in which the stroke is written in any electronic device on any canvas in any electronic device, the handwritten data is in stroke units. No, it is transmitted in point data units.

The handwriting collaboration server system (electronic device 10A) receives, from the electronic device 10B, a plurality of point data corresponding to strokes input by handwriting in the electronic device (for example, the electronic device 10B) logged in to the handwritten information sharing service. . The plurality of point data are sequentially transmitted from the electronic device 10B to the handwriting collaboration server system (electronic device 10A) in chronological order while the stroke is input by handwriting. That is, the plurality of point data is transferred from the electronic device 10B to the handwriting collaboration server system (electronic device 10A) one by one in the order in which the plurality of point data corresponding to the stroke is input.

The handwriting collaboration server system (electronic device 10A) executes processing for storing the plurality of point data in the database 12 together with time stamps indicating the reception times of the plurality of point data. The time stamp corresponding to each point data may indicate the input time of the point data. In this case, the electronic device 10B may transmit each point data to the handwriting collaboration server system (electronic device 10A) together with time information indicating an input time when the point data is input.

Then, the handwriting collaboration server system (electronic device 10A) sequentially transmits the plurality of point data in time series order to another electronic device (for example, electronic device 10C) logged in to the handwritten information sharing service. In this case, the handwriting collaboration server system (electronic device 10A) may execute a process of transmitting the received point data to the electronic device 10C each time one piece of point data is received from the electronic device 10A. .

The electronic device 10C can sequentially receive a plurality of point data from the electronic device 10A in the same manner as when handwritten input is performed on the screen of the electronic device 10C. The electronic device 10C can draw a trajectory corresponding to the stroke input by handwriting in the electronic device 10A in real time on the canvas of the electronic device 10C based on the received plurality of point data. For this reason, it is possible to reproduce a state in which a stroke input by handwriting in the electronic device 10A is written (a state in which a line extends) on the canvas of the electronic device 10C.

When the electronic device 10D logs in to the handwritten information sharing service from the middle, the handwritten collaboration server system (electronic device 10A) stores all the point data (a plurality of first point data) stored in the database 12 before the electronic device 10D logs in. ) Is sequentially transmitted to the electronic device 10D in time series order at timings based on time stamps corresponding to the plurality of first point data, respectively.

Thereby, a large number of strokes that have already been written are displayed on the canvas of the electronic device 10D as if each stroke was replayed. Therefore, the user (intermediate participant) of the electronic device 10D can easily grasp how the current handwritten information has been constructed.

As for a certain stroke, the electronic device 10D can sequentially receive a plurality of point data corresponding to this stroke in the same manner as when handwritten input is performed on the screen of the electronic device 10D. The electronic device 10D can draw a trajectory corresponding to the stroke input by handwriting in the electronic device 10A in real time on the canvas of the electronic device 10D based on the plurality of received point data. Therefore, it is possible to reproduce a state in which each stroke is written (a state in which a line extends).

Furthermore, a plurality of point data corresponding to each stroke is sequentially transmitted to the electronic device 10D at a transmission timing corresponding to the timing at which the point data is written. For this reason, the speed of the written stroke (line) can also be reproduced.

FIG. 7 shows the flow of handwritten data between electronic devices.

In FIG. 7, similarly to FIG. 6, it is assumed that the group owner (electronic device 10 </ b> A), the participant 1 (electronic device 10 </ b> B), and the participant 2 (electronic device 10 </ b> C) have a discussion. .

(1) A stroke is input by handwriting in the electronic device 10B of the participant 1. This stroke is displayed in real time on the canvas of the electronic apparatus 10B. That is, the stroke (line) is drawn so as to follow the movement of the pen on the canvas of the electronic device 10B.

(2) As described above, the stroke is expressed as a set of a plurality of point data (a plurality of coordinates) from the start point to the end point.

(3) The stroke data (stroke data) is transmitted to the group owner (electronic device 10A) in units of point data. This is shown in FIG. As shown in FIG. 8, in the electronic device 10B, while a stroke is handwritten by the pen 100B, a plurality of point data PD1, PD2,..., PD8 corresponding to this stroke are obtained one after another. . These point data PD1, PD2,..., PD8 are transmitted one by one to the group owner (electronic device 10A). That is, the point data PD1, PD2,..., PD8 are sequentially transmitted to the group owner (electronic device 10A) in time series order. For example, when the point data PD1 is obtained, a drawing process based on the point data PD1 is executed by the electronic device 10B, and a process for transmitting the point data PD1 to the group owner (electronic device 10A) is also executed by the electronic device 10B. . When the next point data PD2 is obtained, a drawing process based on the point data PD2 is executed by the electronic device 10B, and a process of transmitting the point data PD2 to the group owner (electronic device 10A) is also executed by the electronic device 10B. Is done.

In this way, a large number of point data are continuously transmitted to the group owner (electronic device 10A) while the stroke is input by handwriting. Each point data is stored in the group owner (electronic device 10A) together with the stroke ID, user ID (or device ID), point type (start point / middle point / end point), pen attributes (pen type, color, etc.), etc. May be sent. The stroke ID is information that can identify a stroke input by handwriting. Each electronic device may generate a unique ID having a plurality of digits using a random number or the like, and use the value of the unique ID as a stroke ID for identifying a stroke input by handwriting first. For strokes handwritten after the second, a value obtained by incrementing the unique ID may be used as the corresponding stroke ID. The same stroke ID is given to each point data corresponding to the same stroke.

(4) The group owner (electronic device 10A) receives a plurality of point data sequentially transmitted from the electronic device 10B in chronological order. Then, the group owner (electronic device 10A) stores the plurality of point data in the database 12 together with a time stamp indicating the reception time (reception timing) or the input time (input timing) of the plurality of point data. Each time stamp may indicate the time when the corresponding point data is received by the group owner (electronic device 10A), or the corresponding point data is received from the time when the first point data in the same stroke is received. The relative time until the point in time may be indicated. Alternatively, each time stamp may indicate the time when the corresponding point data is input, or the relative time from the time when the first point data in the same stroke is input to the time when the corresponding point data is input. Time may be indicated.

(5) The group owner (electronic device 10A) transmits a plurality of point data received from the electronic device 10B to the electronic device 10C.

In this case, the plurality of point data may be sequentially transmitted to the electronic device 10C in time-series order at a timing based on a time stamp corresponding to the plurality of point data. Accordingly, the plurality of point data can be transmitted to the electronic device 10C at the same interval as the interval at which the plurality of point data is received.

The stroke ID, user ID (or device ID), point type (start point / middle point / end point), pen attributes (pen type, color, etc.) are added to each point data to be transmitted.

Alternatively, when the group owner (electronic device 10A) receives one point data from the electronic device 10B, the group owner (electronic device 10A) may immediately transmit the point data to the electronic device 10C.

Further, the group owner (electronic device 10A) may draw a locus corresponding to the stroke input by handwriting on the electronic device 10A in real time on the group owner's canvas based on a plurality of point data from the electronic device 10B. it can.

(6) When the electronic device 10D logs in to the handwritten information sharing service from the middle, the group owner (electronic device 10A) transmits all point data stored so far in the database 12 to the electronic device 10D. In this case, all the point data are sequentially transmitted to the electronic device 10D in time series order at timings based on the time stamps corresponding to all the data. Each point data to be transmitted includes a stroke ID, a user ID (or device ID), a point type (start point / middle point / end point), a pen attribute (pen type, color, etc.), and the like.

These point data may be transmitted to the electronic device 10D at a rate (speed) faster than the rate (speed) at which these point data are received. The rate (speed) at which the point data is received can be obtained by a time stamp corresponding to the point data. The reception rate in a dense period with a large number of point data received per reference time is high, and the reception rate in a coarse period with a small number of point data received per reference time is low.

As a method for transmitting a plurality of point data at a transmission rate faster than the reception rate, a method of transmitting a plurality of point data at a transmission interval shorter than a reception interval between the plurality of point data is used. May be. The reception interval between the plurality of point data can be easily obtained by the time stamp corresponding to the point data.

For example, by transmitting these point data at a transmission interval that is half the reception interval between these point data, these point data are transmitted to the electronic apparatus 10D at a transmission rate that is twice the reception rate of these point data. can do.

In the description of FIG. 7, the processing that is executed when a stroke is input by handwriting in the electronic device 10B has been described. Processing is executed.

For example, when a stroke is input by handwriting in the electronic device 10C, a plurality of point data corresponding to the stroke is transmitted to the group owner (electronic device 10A) in units of point data. That is, while the stroke is input by handwriting, the plurality of point data are sequentially transmitted to the group owner (electronic device 10A) in time series order. The plurality of point data are stored in the database 12 together with a time stamp. The plurality of point data are transmitted to the electronic device 10B in point data units.

When a stroke is input by handwriting in the group owner (electronic device 10A), a plurality of point data corresponding to the stroke is stored in the database 12 together with a time stamp, and further, the plurality of point data is electronically stored in units of point data. It is transmitted to the device 10B and the electronic device 10C.

Next, processing for storing each point data in the database 12 will be described with reference to FIG. 9 to FIG.

FIG. 9 shows an example of handwritten information displayed on the canvas of the electronic device 10B. In FIG. 9, it is assumed that the stroke 50, the stroke 52, and the stroke 53 are shared by a group of three people, the group owner, the participant 1, and the participant 2.

The stroke 50 is a stroke input by the participant 1 by handwriting on the electronic device 10B. The stroke 52 is a stroke input by handwriting on the electronic device 10 </ b> C by the participant 2. The stroke 54 is a stroke input by handwriting on the electronic apparatus 10A by the group owner.

FIG. 10 shows an example of handwritten data stored in the database 12. In the database 12, each point data corresponding to the stroke 50 is stored together with a time stamp. Each point data corresponding to the stroke 52 is also stored together with the time stamp, and each point data corresponding to the stroke 54 is also stored together with the time stamp.

FIG. 11 shows the data structure of the database 12.

In the database 12, for example, a stroke management table 121 and a point management table 122 are constructed.

The stroke management table 121 includes a plurality of rows (records) corresponding to a plurality of strokes. In each record, a “stroke ID” field, a “start time” field, a “user ID” field, a “pen type” field, a “color” field, and the like are defined.

The point management table 122 includes a plurality of rows (records) corresponding to a plurality of point data. In each record, a “stroke ID” field, a “time” field, a “point type” field, a “coordinate x” field, a “coordinate y” field, and the like are defined.

When the electronic device 10A receives the point data corresponding to the start point of a certain stroke, the electronic device 10A adds one record to the stroke management table 121, and adds the value indicating the stroke ID and the start point time to the added record. A value indicating the user ID, a value indicating the pen type, and a value indicating the color are stored. As described above, additional information indicating the stroke ID, user ID, pen type, and color is added to the received point data. Therefore, the electronic device 10A can store a value indicating the stroke ID, a value indicating the user ID, a value indicating the pen type, and a value indicating the color in the record using this additional information. The value indicating the start point time is a time stamp indicating the reception time (reception timing) of the point data corresponding to the start point of the stroke. As this time stamp, any value that can identify the timing at which the point data is received can be used. For example, the time stamp may be an absolute time or a relative time with respect to a certain reference time.

Alternatively, the value indicating the start point time may be a time stamp indicating the input time of the point data corresponding to the start point of the stroke. As this time stamp, any value that can identify the timing at which point data is input can be used.

When the electronic device 10A receives point data corresponding to the start point of a certain stroke, the electronic device 10A further adds one record to the point management table 122, and the value and time indicating the stroke ID in the added record. A value indicating (input time or reception time), a value indicating point type, a value indicating coordinate x, and a value indicating coordinate y are stored. As described above, the point data includes not only information indicating the coordinates x and coordinates y but also additional information indicating the stroke ID and the point type. Therefore, the electronic apparatus 10A can store a value indicating the stroke ID and a value indicating the point type in the record using this additional information. The value indicating the time is a time stamp indicating the input time or the reception time of the point data.

When the electronic device 10A receives point data after the second of a certain stroke, the electronic device 10A adds one record to the point management table 122, and the value and time indicating the stroke ID in the added record. A process of storing a value indicating (input time or reception time), a value indicating the point type, a value indicating the coordinate x, and a value indicating the coordinate y is executed.

The database 12 in FIG. 11 may be shared data that can be referred to from all electronic devices logged into the handwriting sharing service. In this case, each electronic device can roll back the current handwritten information displayed on the canvas to the handwritten information at an arbitrary time point based on the contents of the database 12.

Alternatively, the contents of the database 12 in FIG. 11 may be copied to the local storage of each participant's electronic device. Even in this case, the above-described rollback can be realized.

FIG. 12 shows how a plurality of point data stored in the database 12 are replayed at double speed.

The plurality of point data corresponding to the stroke 50 is transmitted from the electronic device 10A to the electronic device 10D at a time interval that is ½ of the reception interval between the plurality of point data. For example, it is assumed that the reception interval between the first point data and the second point data is T1, and the reception interval between the second point data and the third point data is T2. In this case, the second point data is transmitted to the electronic device 10D when the time interval of T1 / 2 has elapsed since the first point data was transmitted to the electronic device 10D. Then, the third point data is transmitted to the electronic device 10D when the time interval of T2 / 2 has elapsed since the second point data was transmitted to the electronic device 10D.

Thereby, the stroke 50 is replayed at double speed on the canvas of the electronic device 10D. Similarly, a plurality of point data corresponding to the stroke 52 are also transmitted from the electronic device 10A to the electronic device 10D at a time interval that is ½ of the reception interval of the plurality of point data. Thereby, the stroke 52 is replayed at double speed on the canvas of the electronic apparatus 10D. Therefore, the participant 3 who has logged in to the service from the middle can grasp the progress of the discussion so far, that is, how the current handwritten information has been constructed through a short time.

The magnification of the transmission rate (replay speed) with respect to the reception rate is not limited to 2 times, and can be variably set to any magnification such as 1 times, 1.5 times, 3 times, 4 times,. is there. In order to variably set the magnification of the transmission rate with respect to the reception rate, a user interface that can increase or decrease the replay speed according to the user's operation may be used. Alternatively, the ratio of the transmission rate to the reception rate may be changed between a dense period where a lot of point data exists and a coarse period where the number of point data is small. In this case, the magnification of the transmission rate relative to the reception rate may be set to a low magnification close to 1 in the coarse period, and the magnification of the transmission rate relative to the reception rate may be set to a magnification higher than 1 in the dense period.

Alternatively, the magnification of the transmission rate (replay speed) with respect to the reception rate is determined based on the length of the period (delay period) from the time when the handwriting sharing service is started to the time when the electronic device 10D (halfway participant) logs in. May be.

FIG. 13 shows a process for determining the magnification of the transmission rate with respect to the reception rate.

In FIG. 13, t0 represents a point in time when the handwriting sharing service is started, and t1 represents a point in time when the electronic device 10D (participant on the way) logs in. Here, it is assumed that the replay time Rt is fixed. The replay time Rt is a time interval for replaying all the point data accumulated in the database 12 during the delay period Dt. The replay time Rt may be set to 30 seconds or 1 minute, for example.

The magnification N of the transmission rate with respect to the reception rate (original speed) is
N = Dt / Rt
Given by.

Note that the replay time Rt is not necessarily fixed. In this case, for example, if the delay period Dt is less than the threshold time, the replay may be executed at a predetermined first double speed (for example, double speed). On the other hand, if the delay period Dt is equal to or longer than the threshold time, the replay may be executed at a predetermined second speed (for example, 10 times speed). If the time interval from the reception time (or input time) of the previous point data to the reception time (or input time) of the next point data exceeds a certain reference time, this time interval is waited. Instead, the next point data may be transmitted immediately after the previous point data is transmitted.

FIG. 14 shows a system configuration of the tablet computer 10.
As shown in FIG. 14, the tablet computer 10 includes a CPU 101, a system controller 102, a main memory 103, a graphics processing unit (GPU) 104, a BIOS-ROM 105, a nonvolatile memory 106, a wireless communication device 107, an embedded controller (EC). 108 and the like.

The CPU 101 is a processor that controls the operation of various components in the tablet computer 10. The CPU 101 executes various programs loaded from the nonvolatile memory 106 that is a storage device to the main memory 103. These programs include an operating system (OS) 201 and various application programs. The application program includes a handwriting sharing application program 202. The handwriting sharing application program 202 can execute the above-described handwriting collaboration function for sharing handwritten information among a plurality of electronic devices.

The CPU 101 also executes a basic input / output system (BIOS) stored in the BIOS-ROM 105. The BIOS is a program for hardware control.

The system controller 102 is a device that connects between the local bus of the CPU 101 and various components. The system controller 102 also includes a memory controller that controls access to the main memory 103. The system controller 102 also has a function of executing communication with a graphics processing unit (GPU) 104 via a PCI EXPRESS serial bus or the like.

The GPU 104 is a display processor that controls the LCD 17 </ b> A used as a display monitor of the tablet computer 10. A display signal generated by the GPU 104 is sent to the LCD 17A. The LCD 17A displays a screen image based on the display signal. A touch panel 17B is disposed on the upper surface side of the LCD 17A. A digitizer 17C is disposed on the lower surface side of the LCD 17A. The touch panel 17B is a capacitance-type pointing device for inputting on the screen of the LCD 17A. The touch position on the screen where the finger is touched and the movement of the touch position are detected by the touch panel 17B. The digitizer 17C is an electromagnetic induction type pointing device for inputting on the screen of the LCD 17A. The digitizer 17C detects the contact position on the screen where the pen 100 is touched, the movement of the contact position, and the like.

The wireless communication device 107 is a device configured to execute wireless communication. The EC 108 is a one-chip microcomputer including an embedded controller for power management. The EC 108 has a function of turning on or off the tablet computer 10 in accordance with the operation of the power button by the user.

Next, the configuration of the handwriting sharing application program 202 will be described with reference to FIG.

The handwriting sharing application program 202 includes a handwriting input interface 300, a display processing unit 301, a processing unit 302, a transmission control unit 303, a reception control unit 304, and the like as function execution modules for sharing handwritten information.

The handwriting sharing application program 202 creates, displays, and edits handwritten page data by using stroke data that is input using the touch screen display 17. The digitizer 17C of the touch screen display 17 is configured to detect occurrence of events such as “touch”, “move (slide)”, “release” and the like. “Touch” is an event indicating that the pen has touched the screen. “Move (slide)” is an event indicating that the contact position has been moved while the pen is in contact with the screen. “Release” is an event indicating that the pen is released from the screen.

The handwriting input interface 300 is an interface configured to perform handwriting input in cooperation with the digitizer 17C of the touch screen display 17. The handwriting input interface 300 receives a “touch” or “move (slide)” event from the digitizer 17 </ b> C of the touch screen display 17, thereby detecting a handwriting input operation. The “touch” event includes the coordinates of the contact position. The “movement (slide)” event also includes the coordinates of the contact position of the movement destination. Therefore, the handwriting input interface 300 can receive a coordinate sequence (a plurality of point data) corresponding to the movement locus of the contact position from the touch screen display 17.

The display processing unit 301 displays, on the screen of the LCD 17 </ b> A, each stroke input by handwriting input operation using the pen 100 based on the coordinate sequence from the handwriting input interface 300. Further, the display processing unit 301 displays each stroke on the screen of the LCD 17A based on the coordinate sequence received from another electronic device under the control of the processing unit 302.

The transmission control unit 303 executes processing for sequentially transmitting a plurality of point data to other electronic devices in time series using the wireless communication device 107 under the control of the processing unit 302. Under the control of the processing unit 302, the reception control unit 304 uses the wireless communication device 107 to execute processing for sequentially receiving a plurality of point data from other electronic devices in chronological order.

The processing unit 302 executes processing for sharing handwritten information among a plurality of electronic devices. The processing unit 302 includes a member management unit 311, a storage processing unit 312, a replay processing unit 313, and the like.

The member management unit 311 manages each member (electronic device) logged into the handwriting sharing service. The member management unit 311 can determine whether or not to permit login to an electronic device requesting login to the handwriting sharing service. The electronic device that has received permission from the member management unit 311 is permitted to log in to the handwriting sharing service, and is thereby connected to other electronic devices that are logged in to the handwriting sharing service. The function of the member management unit 311 may be executed only in an electronic device (group owner electronic device) operating as a handwriting collaboration server system.

The storage processing unit 312 executes processing for storing each point data received from another electronic device in the database 12 together with a time stamp. When the third electronic device logs in to the service from the middle, the replay processing unit 313 executes the above-described processing for replay. That is, when a certain electronic device logs in to the handwriting sharing service from the middle, the replay processing unit 313 uses a plurality of point data stored in the database 12 before the login of the electronic device as time stamps corresponding to these point data, respectively. At the timing based on the above, processing for sequentially transmitting to the electronic device in chronological order is executed. In this case, transmission of these point data can be executed at N times speed (N is 1 or more).

In an electronic device that operates as a participant (client), the replay processing unit 313 executes a process of displaying the point data while receiving the point data sequentially transmitted from the group owner electronic device in time series.

The flowchart of FIG. 16 shows the procedure of handwritten data distribution processing of the present embodiment.

The processing unit 302 of the handwriting collaboration server system (electronic device 10A) receives, from this electronic device, a plurality of point data corresponding to strokes input by handwriting in any of a plurality of participant electronic devices that are logged in. (Block B11). As described above, the plurality of point data are sequentially transmitted from the electronic device to the handwriting collaboration server system (electronic device 10A) in time series.

The processing unit 302 executes a point data storage process for storing each received point data in the database 12 together with a time stamp indicating the input time or the reception time of the point data (block B12).

The processing unit 302 transmits the received plurality of point data to the electronic devices of other participants (block B13). In block B13, the plurality of point data are sequentially transmitted to the electronic devices of the other participants in chronological order.

The flowchart of FIG. 17 shows the procedure of the point data storage process performed in block B12 of FIG.

When the processing unit 302 receives the point data (YES in block B21), the processing unit 302 determines whether the point data is point data at the start point of the stroke based on the point type added to the point data. Is determined (block B22).

If this point data is point data of the start point of the stroke (YES in block B22), the processing unit 302 adds one record to the stroke management table 121, and a value indicating the stroke ID in the added record, A value indicating the start point time, a value indicating the user ID, a value indicating the pen type, and a value indicating the color are stored (block B23). Then, the processing unit 302 adds one record to the point management table 122, and adds a value indicating the stroke ID, a value indicating the time, a value indicating the point type, a value indicating the coordinate x, and a coordinate y to the added record. Is stored (block B24). Then, the processing unit 302 transmits the received point data to the electronic devices of other participants (block B25).

If the received point data is the midpoint or end point data of the stroke (YES in block B22), the processing unit 302 skips the processing of block B23 and executes only the processing of block B24 and block B25. To do.

FIG. 18 is a flowchart showing the replay processing procedure.

If a new participant joins (logs in) the handwriting sharing service from the middle (YES in block B31), the processing unit 302 stores all the point data stored in the database 12 before the new participant joins. A point data transmission process for transmitting to the electronic device of the new participant is executed (block B32). In block B32, all these point data are sequentially transmitted to the new participant's electronic devices in time-series order at the timing specified by the corresponding time stamp.

The point data transmission process is repeatedly executed until it is determined in block B33 that transmission of all point data has been completed.

The flowchart of FIG. 19 shows the procedure of the point data transmission process.

Here, it is assumed that replay is executed at N times speed based on the length of the delay period Dt.

First, the processing unit 302 determines how many times the original speed should be replayed (block B41). In block B41, the processing unit 302 calculates the magnification N of the transmission rate with respect to the reception rate (original speed) based on the length of the delay period Dt. In the case of using a fixed replay time Rt, the magnification N is
N = Dt / Rt
Given by.

The processing unit 302 transmits the first point data to the electronic device of the new participant (block B42). Next, the processing unit 302 determines the next interval based on the time interval between the reception time (or input time) of the first point data and the reception time (or input time) of the next point data and the magnification N. The transmission timing at which point data is to be transmitted is determined (block B43). The processing unit 302 determines whether or not the next point data transmission timing has arrived (block B44). If the next point data transmission timing has arrived (YES in block B44), the processing unit 302 transmits the first point data to the electronic device of the new participant (block B45). Then, the processing unit 302 determines whether transmission of all point data has been completed (block B46).

Until the transmission of all point data is completed, the processing of blocks B43 to B45 is repeated while updating the next point data to be transmitted.

The flowchart of FIG. 20 shows a procedure of processing executed by the participant's electronic device.

The processing unit 302 of the participant's electronic device transmits a login request (participation request) to the handwriting collaboration server system and logs in to the handwriting sharing service (step B51). If there is point data already stored in the database 12 (YES in block B52), the processing unit 302 transitions to the replay processing mode.

During the replay processing mode, the processing unit 302 prohibits handwriting input of strokes in the participant's electronic device.

In the replay processing mode, the processing unit 302 receives point data transmitted from the handwriting collaboration server system. When the point data is received from the handwritten collaboration server system (YES in block B53), the processing unit 302 executes the drawing process based on the received point data (block B54). Until the reception and drawing of all the already accumulated point data are completed (NO in block B54), the processes in blocks B53 and B54 are repeated.

When the reception and drawing of all the accumulated point data are completed (YES in block B54), the processing unit 302 exits the replay processing mode and transitions to the handwriting sharing mode. In the handwriting sharing mode, the processing unit 302 permits handwriting input of strokes in the participant's electronic device.

If handwriting input of a stroke is started by the user (participant) in the handwriting sharing mode (YES in block B56), the processing unit 302 performs processing for drawing a stroke based on a plurality of point data corresponding to the stroke. (Block B57), and further, a process of sequentially transmitting a plurality of point data to the handwriting collaboration server system in chronological order (block B58).

In the handwriting sharing mode, when point data is received from the handwriting collaboration server system (YES in block B59), the processing unit 302 executes drawing processing based on the received point data (block B60).

Next, the rollback process will be described with reference to FIGS.

21. As shown in FIG. 21, the contents of the current handwritten information being shared are displayed on the canvas. Here, handwritten data 401, handwritten data 402, handwritten data 403, and handwritten data 404 are displayed on the canvas. Each of these handwritten data is composed of one or more strokes input by handwriting in any electronic device logged into the handwriting sharing service.

The user can also display a menu on the canvas. This menu includes a “Timeline” button. The “timeline” button is a software button for starting rollback processing.

When the “timeline” button is tapped by the user, as shown in FIG. 22, a timeline 501, a slider 502 that can be moved on the timeline 501, a playback button 504, and the like are displayed on the canvas.

The left end of the timeline 501 corresponds to the time when the handwriting sharing service is started. The right end of the timeline 501 corresponds to the current time. The default position of the slider 502 is the right end of the timeline 501.

As shown in FIG. 23, when the user moves the slider 502 to, for example, the center position of the timeline 501, the content of the handwritten information on the canvas is updated to the handwritten information at the time corresponding to the center position. The

* Data handwritten after the time corresponding to the central position disappears from the canvas. Here, the handwritten data 403 and the handwritten data 404 disappear from the canvas.

When the playback button 504 is tapped by the user, handwritten information from the time point specified by the slider 502 to the present time is started to be replayed.

In the above description, the case where one of a plurality of electronic devices logged in to the handwriting sharing service functions as a handwriting collaboration server system is illustrated. However, the handwriting collaboration server system includes one or more servers other than these electronic devices. It may be realized by.

As described above, in the present embodiment, handwritten data is transmitted not in units of stroke data but in units of point data. Therefore, regardless of the electronic device in which the stroke is input by handwriting, the state in which the stroke is written can be reproduced on the canvas of all other electronic devices. Therefore, handwritten information can be shared in real time.

Further, when the electronic device 10D logs in to the handwritten information sharing service from the middle, the handwriting collaboration server system (electronic device 10A) stores all the point data (a plurality of first data items) stored in the database 12 before the electronic device 10D logs in. Point data) is sequentially transmitted to the electronic device 10D in time-series order at timings based on time stamps respectively corresponding to the plurality of first point data.

Thus, a large number of strokes that have already been written are displayed on the canvas of the electronic device 10D as if the strokes were written. Therefore, the user (intermediate participant) of the electronic device 10D can easily grasp how the current handwritten information has been constructed.

Also, the conference may be held over several days. In this case, at the beginning of the next day's meeting, the database 12 storing handwritten information until the end of the previous day's meeting may be used to replay the process in which the handwritten information was constructed in the previous day's meeting.

The contents of the database 12 may be stored in the local storage of each electronic device at the end of the conference.

In addition, the function of the handwriting collaboration server system (electronic device 10A) of this embodiment is realizable by one or more processors.

Moreover, since the function of the handwriting collaboration server system (electronic device 10A) of this embodiment can be realized by a computer program, the computer program is installed in the computer through a computer-readable storage medium storing the computer program. The effect similar to this embodiment can be easily realized only by executing.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Claims (15)

1. Receiving means for receiving, from the first electronic device, a plurality of point data corresponding to a stroke input by handwriting in a first electronic device logged in to a service capable of sharing handwritten information, the plurality of points The data is sequentially transmitted from the first electronic device in chronological order while the stroke is input by hand, and receiving means;
   Processing means for executing processing for storing the plurality of point data in a storage medium together with a time stamp indicating an input time or reception time of the plurality of point data;
   Transmission means for sequentially transmitting the plurality of point data to a second electronic device logged into the service in chronological order;
   When a third electronic device logs in to the service from the middle, the processing means stores a plurality of first point data stored in the storage medium before the third electronic device logs in the plurality of first items. A system for executing processing for sequentially transmitting to the third electronic device in time-series order at a timing based on a time stamp corresponding to each point data.
2. The processing means sequentially transmits the plurality of first point data to the third electronic device in a time-series order at a first rate faster than a rate at which the plurality of first point data is received. The system described.
3. The system according to claim 2, wherein a magnification of the first rate with respect to a rate at which the plurality of first point data is received can be variably set.
4. The ratio of the first rate to the rate at which the plurality of first point data is received is determined based on the length of the period from the time when the service is started to the time when the third electronic device logs in. The system according to claim 2.
5. The system according to claim 1, wherein handwriting input of a stroke in the third electronic device is prohibited until transmission of the plurality of first point data to the third electronic device is completed.
6. Receiving a plurality of point data corresponding to strokes input by handwriting in a first electronic device logged in to a service capable of sharing handwritten information from the first electronic device, wherein the plurality of point data Receiving sequentially transmitted from the first electronic device in chronological order while the stroke is input by handwriting;
   Storing the plurality of point data in a storage medium together with a time stamp indicating an input time or a reception time of the plurality of point data;
   Sequentially transmitting the plurality of point data to a second electronic device logged into the service in chronological order;
   When a third electronic device logs in to the service from the middle, a plurality of first point data stored in the storage medium before the third electronic device logs in corresponds to the plurality of first point data, respectively. And sequentially transmitting to the third electronic device in chronological order at a timing based on the time stamp.
7. Transmitting the plurality of first point data may include transmitting the plurality of first point data to the third electronic device at a first rate that is faster than a rate at which the plurality of first point data is received. 7. The method of claim 6, comprising transmitting sequentially in sequence order.
8. The method according to claim 7, wherein a magnification of the first rate with respect to a rate at which the plurality of first point data is received can be variably set.
9. The ratio of the first rate to the rate at which the plurality of first point data is received is determined based on the length of the period from the time when the service is started to the time when the third electronic device logs in. The method according to claim 7.
10. The method according to claim 6, wherein handwriting input of strokes in the third electronic device is prohibited until transmission of the plurality of first point data to the third electronic device is completed.
11. A program executed by a computer,
    Receiving a plurality of point data corresponding to strokes input by handwriting in a first electronic device logged in to a service capable of sharing handwritten information from the first electronic device, wherein the plurality of point data Receiving sequentially transmitted from the first electronic device in chronological order while the stroke is input by handwriting;
    Storing the plurality of point data in a storage medium together with a time stamp indicating an input time or a reception time of the plurality of point data;
    Sequentially transmitting the plurality of point data to a second electronic device logged into the service in chronological order;
    When a third electronic device logs in to the service from the middle, a plurality of first point data stored in the storage medium before the third electronic device logs in corresponds to the plurality of first point data, respectively. A program for controlling the computer to execute a function of sequentially transmitting to the third electronic device in a time-series order at a timing based on a time stamp.
12. Transmitting the plurality of first point data may include transmitting the plurality of first point data to the third electronic device at a first rate that is faster than a rate at which the plurality of first point data is received. The program according to claim 11, comprising transmitting sequentially in a sequence order.
13. 13. The program according to claim 12, wherein a magnification of the first rate with respect to a rate at which the plurality of first point data is received can be variably set.
14. The ratio of the first rate to the rate at which the plurality of first point data is received is determined based on the length of the period from the time when the service is started to the time when the third electronic device logs in. The program according to claim 12.
15. 12. The program according to claim 11, wherein handwriting input of strokes in the third electronic device is prohibited until transmission of the plurality of first point data to the third electronic device is completed.

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