JP2024060646A - Online class support system, online class support program, and online class support method - Google Patents

Abstract

[Problem] To provide an online class support system, online class support program, and online class support method that enable online classes with excellent interactivity and real-timeness between a teacher terminal and a student terminal. [Solution] The system has a note sharing function that displays the same note screen in real time on the touch panel 10 of the teacher terminal 2 and the student terminal 3, and has a stroke ID issuing unit 41 that issues a stroke ID every time writing is started on the note screen of the own terminal, a writing information acquiring unit 42 that acquires writing information while writing continues, a point sequence data sending unit 43 that sends point sequence data to a server 4, a point sequence data acquiring unit 44 that acquires point sequence data of other terminals from the server 4, and a writing reproduction unit 45 that reproduces writings of other terminals on the touch panel 10 of the own terminal in real time. [Selected Figure] Figure 2

Description

Application for exception to loss of novelty has been filed

The present invention relates to an online class support system, an online class support program, and an online class support method that can provide online classes with excellent interactivity and real-time performance.

In recent years, there have been an increasing number of opportunities for schools, cram schools, etc. to conduct online classes using web conferencing systems. For example, JP 2022-109025 A proposes an online class system for conducting such online classes, which acquires first video data in which a teacher's face is photographed from a predetermined angle and second video data in which the teacher's face is photographed from an angle different from that of the first video data, acquires student information on a student that the teacher focuses on, and displays the first video data or the second video data on the display screen of the student's terminal based on the student information (Patent Document 1).

JP 2022-109025 A

However, in the invention described in Patent Document 1, the students' display screens only display images of the teacher's face, and the teacher's display screen only displays images of the students' faces. This means that, compared to face-to-face classes, the teacher cannot see what the students are doing, making it difficult for him to grasp the students' situations, such as whether they are understanding the lesson or concentrating on it. On the other hand, because the teacher does not write on the blackboard or other surface but only displays texts and questions on the display screen, it is difficult for the students to understand the lesson.

The present invention has been made to solve these problems, and aims to provide an online class support system, an online class support program, and an online class support method that can reproduce writings on a notebook screen of another terminal on the notebook screen of one's own terminal in real time, and conduct online classes with excellent interactivity and real-time performance between a teacher terminal and a student terminal.

The online class support system of the present invention reproduces writings on a notebook screen of another terminal on the notebook screen of its own terminal in real time, and supports online classes conducted between a teacher terminal and a student terminal via a server in order to solve the problem of conducting online classes with excellent interactivity and real-time performance between a teacher terminal and a student terminal. The online class support system has a note sharing function that displays the same notebook screen in real time on the touch panels of both the teacher terminal and the student terminal, and each time writing is started on the notebook screen of its own terminal, each time writing is started on the notebook screen of its own terminal, the teacher terminal and the student terminal each identify the writing. a stroke ID issuing unit that issues a stroke ID corresponding to the stroke ID; a writing information acquiring unit that acquires writing information including a writing position and writing time related to the writing at a predetermined time interval while the writing continues; a point sequence data sending unit that sends point sequence data consisting of the stroke ID and the writing information to the server at a predetermined time interval; a point sequence data acquiring unit that acquires the point sequence data transmitted from the other terminal from the server at a predetermined time interval; and a writing reproduction unit that reproduces the writing on the other terminal on the touch panel of the own terminal in real time based on the writing information having the same stroke ID each time the point sequence data acquiring unit acquires the point sequence data.

In addition, as one aspect of the present invention, in order to solve the problem of reducing the amount of communication when displaying a note screen on which previously written notes have been made, the server, when a request to display the note screen on which previously written notes has been made is received from the teacher terminal or the student terminal, acquires the point sequence data relating to all notes written on the note screen, and converts the second and subsequent coordinate groups of the time-series coordinates indicating the writing positions contained in each point sequence data into relative coordinates with respect to the previous coordinates, and may have a point sequence data compression unit that converts each of the relative coordinates into a single character or symbol.

Furthermore, as one aspect of the present invention, in order to solve the problem of accurately decoding the point sequence data compressed by the server, each of the teacher terminal and the student terminal may have a point sequence data decoding unit that, upon acquiring the point sequence data compressed by the point sequence data compression unit, converts each of the characters or symbols into relative coordinates, and sequentially decodes the second and subsequent relative coordinates into time-series coordinates indicating the writing position based on the first coordinate indicating the writing position.

In addition, as one aspect of the present invention, in order to solve the problem of reducing the amount of communication when a teacher terminal displays a list of note screens on multiple student terminals in real time and suppressing deterioration in image quality, a monitoring function is provided on the touch panel of the teacher terminal to display a list of note screens on multiple student terminals in real time, and the student terminal has a display control unit that displays the note screen by combining a background layer having a background image with a student layer that records writings by students, a writing image storage unit that stores all writings written in the student layer at predetermined time intervals as writing images, a difference image creation unit that acquires all writings in the student layer at predetermined time intervals and compares the newly written parts with the writing image to create a difference image, a data size calculation unit that calculates the data size of a low-quality composite image obtained by combining and compressing the background image, the writing image, and the difference image, and a data size calculation unit that calculates the data size of the difference image, and a data size calculation unit that first transmits the background image and the writing image to a server and then, at predetermined time intervals, transfers the smaller data size of the low-quality composite image or the difference image to the front. The image transmitting unit transmits the low-quality composite image to the server, and when the image transmitting unit transmits the low-quality composite image after transmitting the difference image, a high-quality composite image storage unit stores a high-quality composite image obtained by combining the writing image and the difference image. When the image transmitting unit transmits the difference image after transmitting the low-quality composite image, the image transmitting unit transmits the newly written portion as the difference image by comparing it with the high-quality composite image. The teacher terminal has a student image acquiring unit that acquires the low-quality composite image or the difference image for each student terminal at a predetermined time interval after first acquiring the background image and the writing image transmitted from each of the student terminals from the server, and a student image display unit that decodes the low-quality composite image when the low-quality composite image is received from the server and displays it as a notebook screen, and when the difference image is received from the server, combines the difference image with the background image and the writing image and displays it as a notebook screen. When the difference image is received from the server, an image obtained by combining the writing image and the difference image may be stored as a new writing image.

Furthermore, as one aspect of the present invention, in order to solve the problem of preventing duplicate transmissions from the server to the teacher terminal and reducing communication volume, the server may have a duplicate transmission prevention unit that does not transmit to the teacher terminal the background image that has been received from the student terminal and that has already been transmitted to the teacher terminal once.

The online class support program of the present invention reproduces writings on a notebook screen of another terminal on the notebook screen of the own terminal in real time, and supports online classes conducted between a teacher terminal and a student terminal via a server in order to solve the problem of conducting online classes with excellent interactivity and real time between the teacher terminal and the student terminal. The program has a note sharing function that displays the same notebook screen in real time on the touch panels of both the teacher terminal and the student terminal, and a stroke ID that identifies the writing is issued each time writing is started on the notebook screen of the own terminal. The computer functions as a stroke ID issuing unit, a writing information acquiring unit that acquires writing information including the writing position and writing time related to the writing at a predetermined time interval while the writing continues, a point sequence data sending unit that sends point sequence data consisting of the stroke ID and the writing information to the server at a predetermined time interval, a point sequence data acquiring unit that acquires the point sequence data transmitted from the other terminal from the server at a predetermined time interval, and a writing reproduction unit that reproduces the writing on the other terminal on the touch panel of the own terminal in real time based on the writing information having the same stroke ID each time the point sequence data acquiring unit acquires the point sequence data.

The online class support method according to the present invention is a method for supporting online classes conducted between a teacher terminal and a student terminal via a server, in order to solve the problem of reproducing writings on a notebook screen of another terminal on the notebook screen of the own terminal in real time and conducting online classes with excellent interactivity and real time between the teacher terminal and the student terminal, and has a note sharing function that displays the same notebook screen in real time on the touch panels of both the teacher terminal and the student terminal, and a stroke ID assignment step that assigns a stroke ID that identifies the writing each time writing is started on the notebook screen of the own terminal. a writing information acquisition step of acquiring writing information including the writing position and writing time related to the writing at a predetermined time interval while the writing continues; a point sequence data transmission step of transmitting point sequence data consisting of the stroke ID and the writing information to the server at a predetermined time interval; a point sequence data acquisition step of acquiring the point sequence data transmitted from the other terminal from the server at a predetermined time interval; and a writing reproduction step of reproducing the writing on the other terminal on the touch panel of the own terminal in real time based on the writing information having the same stroke ID each time the point sequence data is acquired in the point sequence data acquisition step.

According to the present invention, writings on a notebook screen of another terminal can be reproduced on the notebook screen of one's own terminal in real time, making it possible to conduct online lessons with excellent interactivity and real-time performance between the teacher terminal and the student terminal.

1 is a diagram showing an embodiment of an online class support system according to the present invention. FIG. 2 is a block diagram showing a teacher terminal according to the present embodiment. FIG. 2 is a block diagram showing a student terminal according to the present embodiment. FIG. 2 is a block diagram showing a server according to the present embodiment. FIG. 2 is a diagram showing layers constituting the note screen of the present embodiment. 4 is a table showing a correspondence table used by a point sequence data compression unit of the present embodiment. 10 is a flowchart showing the process of a note sharing function according to the present embodiment. 1A and 1B are diagrams showing an example of a notebook screen on a teacher's terminal and a notebook screen on a student's terminal, respectively, during execution of a notebook sharing function in the present embodiment. 8 is a flowchart showing a page jump process in FIG. 7 . 4 is a flowchart showing a process of a monitoring function of the present embodiment. FIG. 13 is a diagram showing an example of a notebook screen of each student terminal displayed on a touch panel of a teacher terminal that has executed a monitoring function in the present embodiment. 11 is a flowchart illustrating a continuation of FIG. 10 . FIG. 13 shows a background image A, a writing image B, and a difference image C before being combined on the teacher terminal, and the notebook screen (A+B+C) after being combined.

Below, an embodiment of the online class support system, online class support program, and online class support method according to the present invention will be described with reference to the drawings.

Figure 1 shows an online class support system 1 of this embodiment, in which a teacher terminal 2 used by a teacher, a student terminal 3 used by a student, and a server 4 that mediates data transmission and reception between the teacher terminal 2 and the student terminal 3 are connected to each other via a communication network so that they can communicate with each other. The system is configured to be able to mainly execute the two functions shown below.

(i) Note sharing function: A function for displaying the same note screen in real time on the touch panel 10 of both the teacher terminal 2 and the student terminal 3. (ii) Monitoring function: A function for displaying a list of note screens of multiple student terminals 3 in real time on the touch panel 10 of the teacher terminal 2.

Below, we will explain each of the teacher terminal 2, student terminal 3, and server 4. Note that while FIG. 1 shows an example in which three student terminals 3 are used, this number is not limited to this. Depending on the type of online class, one terminal may be used if the class is in the form of individual instruction or a private tutor, or several dozen terminals may be used if the class is in the form of a school or cram school.

The teacher terminal 2 and student terminal 3 in this embodiment are configured with computers such as tablets or notebook computers, and as shown in Figures 2 and 3, have a touch panel 10, communication means 20, storage means 30, and calculation processing means 40. On the other hand, the server 4 is configured with a computer such as a cloud server 4, and as shown in Figure 4, has communication means 20, storage means 30, and calculation processing means 40. Each component means will be described in detail below. Note that the same or corresponding components of the teacher terminal 2, student terminal 3, and server 4 are given the same reference numerals, and duplicate explanations will be omitted.

The touch panel 10 has both a display function and an input function. In this embodiment, the touch panel 10 displays a note screen shared between the teacher terminal 2 and the student terminal 3, and outputs position information (coordinates) of a location that is touch-input on the touch panel 10. Note that a stylus pen, a finger, or the like is used for touch input on the touch panel 10.

The communication means 20 implements communication functions in the teacher terminal 2, the student terminal 3, and the server 4. In this embodiment, the communication means 20 is compatible with carrier network standards such as the fourth generation (4G) and fifth generation (5G) and wireless LAN standards such as Wi-Fi (registered trademark), and is configured to transmit and receive various types of data via any of the communication networks.

The storage means 30 stores various data and functions as a working area when the arithmetic processing means 40 performs arithmetic processing. In this embodiment, the storage means 30 is composed of a hard disk, a ROM (Read Only Memory), a RAM (Random Access Memory), a flash memory, etc.

The storage means 30 of the teacher terminal 2 has a program storage unit 31, a background image storage unit 32, and a writing image storage unit 33, as shown in Figure 2. The storage means 30 of the student terminal 3 has a program storage unit 31, a background image storage unit 32, a writing image storage unit 33, and a high-quality composite image storage unit 34, as shown in Figure 3. The storage means 30 of the server 4 has a program storage unit 31, a background image storage unit 32, a writing image storage unit 33, a point sequence data storage unit 35, and a monitoring image storage unit 36, as shown in Figure 4.

The program storage unit 31 has installed therein an online class support program 1a for executing the online class support method of this embodiment. The calculation processing means 40 executes the online class support program 1a, thereby causing the computers serving as the teacher terminal 2, student terminal 3, and server 4 to function as the respective components described below.

The form of use of the online class support program 1a is not limited to the above configuration. For example, the online class support program 1a may be stored in a non-transitory computer-readable recording medium, such as a CD-ROM or DVD-ROM, and may be read and executed directly from the recording medium. The online class support program 1a may also be used from an external server 4, etc., using a cloud computing method or an ASP (Application Service Provider) method.

The background image storage unit 32 stores background images that form the background of the notebook screen. In this embodiment, the notebook screen has a three-layer structure, as shown in FIG. 5, divided into a background layer that holds the background image, a teacher layer that records the teacher's writings, and a student layer that records the students' writings. For this reason, the background image storage unit 32 on the teacher terminal 2 side stores background images or their identification IDs in association with each of the student terminals 3. Note that background images include images of teaching materials such as textbooks and workbooks, lined images such as notebooks, and blank images.

The writing image storage unit 33 stores writing images that are images of writings made by students. In this embodiment, the writing image storage unit 33 on the student terminal 3 stores writing images consisting of all characters, figures, etc. written in the student layer on the student terminal 3, and is updated at a predetermined time interval. On the other hand, the writing image storage unit 33 on the teacher terminal 2 stores writing images acquired from the student terminals 3 via the server 4 in association with each of the student terminals 3, and is updated at a predetermined time interval. In addition, when the writing image storage unit 33 on the teacher terminal 2 receives a difference image described below from the server 4, an image obtained by combining the difference image and the writing image is stored as a new writing image.

The high-quality composite image storage unit 34 stores a high-quality composite image that is a composite of the written image and the difference image on the student terminal 3. In this embodiment, when executing the monitoring function, as described below, the difference image creation unit 52 acquires writings on the student layer at a predetermined time interval, compares it with the written image, and creates a difference image of the newly written portion. The high-quality composite image that is a composite of this difference image and the written image is the same as the updated written image, but is stored in the high-quality composite image storage unit 34 separately from the written image.

The point sequence data storage unit 35 stores point sequence data transmitted from the teacher terminal 2 or student terminal 3 in the server 4. In this embodiment, while the note sharing function is being executed, the point sequence data storage unit 35 sequentially stores point sequence data transmitted at a predetermined time interval from the teacher terminal 2 or student terminal 3 on which writing is being performed. As described below, the point sequence data is made up of a stroke ID and writing information, and is data related to a point sequence for reproducing writing on another terminal on one's own terminal.

In addition, in this embodiment, the point sequence data storage unit 35 stores point sequence data relating to writings made in the past by the teacher terminal 2 or the student terminal 3. Specifically, the point sequence data relating to all writings made on each note screen is stored in association with the user ID of the user who made the writing, the note ID of the note screen on which the writing was made, the page number within the note screen, etc.

The monitoring image storage unit 36 stores image data for monitoring the notebook screen of each student terminal 3 in the server 4. In this embodiment, as described below, the monitoring image storage unit 36 stores differential images in high-image-quality mode or low-image-quality composite images in low-image-quality mode transmitted from the student terminal 3 at predetermined time intervals in association with each student terminal 3.

Next, the calculation processing means 40 is composed of a CPU (Central Processing Unit) and the like, and by executing the online class support program 1a installed in the program storage unit 31, causes the computer serving as the teacher terminal 2, the student terminal 3, and the server 4 to function as each of the components described below.

Specifically, as shown in Figures 2 and 3, the calculation processing means 40 of the teacher terminal 2 and the student terminal 3 function as a stroke ID issuing unit 41, a writing information acquiring unit 42, a point sequence data transmitting unit 43, a point sequence data acquiring unit 44, a writing reproducing unit 45, a page request unit 46, a point sequence data decoding unit 47, and a display control unit 48. The calculation processing means 40 of the teacher terminal 2 also functions as a student image acquiring unit 49 and a student image display unit 50, and the calculation processing means 40 of the student terminal 3 also functions as an image transmitting unit 51, a difference image creating unit 52, and a data size calculating unit 53. The calculation processing means 40 of the server 4 also functions as a point sequence data compressing unit 54 and a duplicate transmission preventing unit 55.

First, we will provide a more detailed explanation of the stroke ID issuing unit 41, the writing information acquiring unit 42, the point sequence data sending unit 43, the point sequence data acquiring unit 44, the writing reproducing unit 45, the page request unit 46, the point sequence data compressing unit 54, and the point sequence data decoding unit 47, which are executed in the note sharing function among the above components.

The stroke ID assignment unit 41 assigns a stroke ID that identifies each stroke of writing. In this embodiment, the stroke ID assignment unit 41 considers a series of writing actions from the touch of a stylus pen or finger to the movement and removal of the stylus pen or finger on the touch panel 10 of the user's own terminal (teacher terminal 2 or student terminal 3) to be one stroke, and assigns a new stroke ID each time writing is started on the notebook screen.

The writing information acquisition unit 42 acquires writing information related to writing. In this embodiment, the writing information is information for reproducing the writing movement and speed, and includes at least the writing position and writing time. Therefore, while writing on the note screen continues, the writing information acquisition unit 42 acquires the writing position (x coordinate, y coordinate) from the touch panel 10 at predetermined time intervals, and acquires the writing time from the built-in clock of the terminal.

Note that the writing information may include information such as the writing position and writing time, the color used for writing, the thickness of the writing line, and the tool used for writing (pen, highlighter, eraser, etc.). In this embodiment, the time interval for obtaining the writing information is set to approximately 13 milliseconds, but this is not limited to this and may be any time interval that ensures real-time performance when sharing the note screen.

The point sequence data transmission unit 43 transmits point sequence data consisting of a stroke ID and writing information to the server 4. In this embodiment, the point sequence data transmission unit 43 transmits point sequence data consisting of the stroke ID issued by the stroke ID issue unit 41 and the writing information acquired by the writing information acquisition unit 42 to the server 4 at a predetermined time interval. The point sequence data may also include a user ID that identifies the user who sent the point sequence data, and a page number that identifies the page on which the writing was made. The transmission interval by the point sequence data transmission unit 43 matches the acquisition interval of the writing information by the writing information acquisition unit 42.

The point sequence data acquisition unit 44 acquires point sequence data transmitted from other terminals from the server 4. In this embodiment, while the note sharing function is being executed, the point sequence data acquisition unit 44 accesses the server 4 at a predetermined time interval, and acquires point sequence data of other terminals sharing the note screen by specifying a user ID and a page number. The acquisition interval for this point sequence data is also set to a time interval that can ensure real-time performance when sharing the note screen.

The writing reproduction unit 45 reproduces writing on another terminal on the touch panel 10 of the own terminal. In this embodiment, the writing reproduction unit 45 reproduces writing on another terminal on the touch panel 10 of the own terminal in real time based on writing information having the same stroke ID each time the point sequence data acquisition unit 44 acquires point sequence data.

Specifically, the writing reproduction unit 45 identifies a point on the touch panel 10 that corresponds to the writing position (x coordinates, y coordinates) included in the writing information (hereinafter referred to as the point in question), and draws a line connecting the previous point to the current point during the time interval from the writing time of the previous point to the writing time of the current point. As a result, writings written on another terminal are reproduced in real time on the note screen on the touch panel 10. In addition, in this embodiment, when connecting points, the writing reproduction unit 45 reproduces the movement of a stylus pen or a finger by interpolating with a cubic Bezier curve, and displays it on the note screen as a continuous smooth curve.

In the note sharing function, the page request unit 46 requests the display of a note screen other than the currently displayed note screen among the note screens consisting of multiple pages. In this embodiment, when a desired page is specified using a button or the like displayed on the touch panel 10, the page request unit 46 transmits the page number corresponding to that page to the server 4.

The dot sequence data compression unit 54 is a functional unit on the server 4 side, and compresses dot sequence data relating to all writings made on a specified note screen. In this embodiment, the dot sequence data compression unit 54 acquires from the dot sequence data storage unit 35 all dot sequence data corresponding to the page number received from the page request unit 46 of the teacher terminal 2 or the student terminal 3.

Then, the point sequence data compression unit 54 converts the second and subsequent coordinate groups of the time-series coordinates indicating the writing positions included in each point sequence data into relative coordinates with respect to the previous coordinates, and converts each of the relative coordinates into a single character or symbol. Note that the point sequence data compression unit 54 functions when a request is made to display a note screen on which writing has been done in the past, but does not function when a request is made to display a note screen on which no writing has been done in the past.

Here, the compression process by the point-sequence data compression unit 54 will be specifically described using as an example the case where the following point-sequence data (only the x, y coordinates of the writing position are shown) is compressed.
{"x":559.1, "y":223.7},
{"x":560.1, "y":224.6},
{"x":559.1, "y":224.6},
{"x":556.2, "y":225.6},
{"x":555.3, "y":225.6},
{"x":553.3, "y":225.6},
{"x":551.4, "y":225.6},
{"x":549.5, "y":224.6},
{"x":545.6, "y":223.7},
{"x":542.7, "y":223.7}

First, the point sequence data compression unit 54 converts the second and subsequent coordinate groups into relative coordinates with respect to the previous coordinates. For example, for each of the x and y coordinate groups from the second and subsequent coordinate groups, the difference with respect to the previous coordinate is calculated, and the difference is multiplied by 10 to convert into relative coordinates. As a result, the point sequence data is converted as follows:
{"x":559.1, "y":223.7},
{"x":10, "y":9},
{"x":-10, "y":0},
{"x":-29, "y":10},
{"x":-9, "y":0},
{"x":-20, "y":0},
{"x":-19, "y":0},
{"x":-19, "y":-10},
{"x":-49, "y":-9},
{"x":-19, "y":0}

Here, the second and subsequent point sequence data are arranged in the order of x, y with spaces as delimiters, as shown below.
"x":559.1,
"y":223.7,
"xys":"10 9 -10 0 -29 10 -9 0 -20 0 -19 0 -19 -10 -49 9 -19 0"

The point sequence data compression unit 54 then converts each of the converted relative coordinates into one character or symbol. In the case of handwritten characters, the numerical values of the relative coordinates are almost always between -39 and 39. Therefore, the 79 integers between -39 and 39 are converted into characters or symbols using a correspondence table such as that shown in FIG. 6. However, if the numerical value is smaller than -39 or larger than 39, the numerical value is divided by 40, and the remainder is made into a character, and the symbol "<" is added to the left of the number of integer quotients obtained by dividing the absolute value of the numerical value by 40. For example, -49 = <r, and 92 = <<C.

If the above point sequence data is converted using this irregular base 40 number system, it will look like this, and no spaces are needed to separate the numbers:
"x":559.1,
"y":223.7,
"xys":"A9q0?Ar0g0h0hq<rrh0?0"

By performing the compression process described above, the dot sequence data, which was originally 249 characters, is compressed to 50 characters. Note that the compression process performed by the dot sequence data compression unit 54 is not limited to the above method, and may be changed as appropriate as long as it is a process that can compress data.

The point sequence data decoding unit 47 decodes the point sequence data compressed by the point sequence data compression unit 54. In this embodiment, when the point sequence data decoding unit 47 acquires the point sequence data compressed by the point sequence data compression unit 54, it converts each character or symbol into relative coordinates using the same correspondence table (FIG. 6) used during compression. Then, based on the first coordinate indicating the writing position, the point sequence data decoding unit 47 sequentially decodes the second and subsequent relative coordinates into time-series coordinates indicating the writing position. In other words, the point sequence data decoding unit 47 executes a process that is the reverse of the compression process performed by the point sequence data compression unit 54.

Next, we will explain the monitoring function of this embodiment in order to explain each of the above components of the calculation processing means 40 that are executed in the monitoring function.

One possible method for implementing the monitoring function is to send screenshot images of the student terminal 3 to the teacher terminal 2 via the server 4 at regular intervals. However, this method places a heavy load on the server 4 if the image is made as high resolution as the note sharing function. On the other hand, while the amount of data can be reduced by lowering the number of colors and resolution of the screenshot image, the image quality will be low, making it difficult to see, and other inconveniences will be reduced.

Therefore, in this embodiment, when constructing the algorithm for the monitoring function, we focused on the following characteristics of online classes.
(1) Background images in textbooks, workbooks, etc. are rarely changed dynamically. For this reason, the background image needs to be transmitted only once per page.
(2) When there is one teacher terminal 2 and many student terminals 3, the background image serving as the teaching material is common to all student terminals 3. For this reason, it is necessary to transmit the background image for only one student.
(3) The ability to erase notes once they have been written using an eraser function or other such tool is limited.
(4) Due to the nature of handwritten notes, only a small portion of the data on the note screen changes per unit time.

In light of the above, in this embodiment, we have devised an algorithm that combines high image quality with low data volume. Specifically, we have prepared the two modes shown below, and we have decided to select and execute the mode that produces the smaller amount of data as appropriate.

(A) High-quality mode: The notebook screen on the student terminal 3 is decomposed into a background layer and a student layer as shown in Figure 5. After initially transmitting a high-quality background image and written image, high-quality difference images of the newly written portions on the student layer are transmitted sequentially, while all images are synthesized on the teacher terminal 2 to reproduce a high-quality notebook screen on the student terminal 3.
(B) Low-image-quality mode: The student terminal 3 combines all layers and transmits a compressed low-image-quality composite image, while the teacher terminal 2 decodes the low-image-quality composite image to reproduce a low-image-quality notebook screen on the student terminal 3.

Generally speaking, the amount of data tends to be smaller in high-quality mode. However, as mentioned above, the algorithm for high-quality mode assumes that there is little movement on the note screen. For this reason, in the following cases, the average amount of data will be smaller in low-quality mode.
- When using video or other teaching materials with a lot of movement as a background image. - When there is a lot of writing per unit time, such as drawings instead of text. - When there are few student terminals 3 to be monitored, such as in one-on-one individual instruction. - When there are many different background images, such as when many student terminals 3 use different teaching materials.

When executing the above-mentioned monitoring functions, the calculation processing means 40 functions as a display control unit 48, an image transmission unit 51, a duplicate transmission prevention unit 55, a difference image creation unit 52, a data size calculation unit 53, a student image acquisition unit 49, and a student image display unit 50. Each of these components will be described below.

The display control unit 48 controls the display of the note screen on the touch panel 10. In this embodiment, the display control unit 48 displays the note screen by combining a background layer having a background image, a teacher layer that records the teacher's writings, and a student layer that records the student's writings, as shown in FIG. 5. Note that in this embodiment, the teacher layer is also combined with the note screen, but if only the monitoring function is to be executed, there is no need to provide a teacher layer.

The image transmission unit 51 transmits image data from the student terminal 3 to the server 4. In this embodiment, the image transmission unit 51 first transmits to the server 4 the background image currently in use stored in the background image storage unit 32 and the writing image currently written in the student layer of the writing image storage unit 33. Thereafter, at predetermined time intervals, the image transmission unit 51 transmits either the low-quality composite image or the difference image, whichever has the smaller data size, to the server 4. Also, in this embodiment, when transmitting a difference image after transmitting a low-quality composite image, the image transmission unit 51 compares the newly written portion with the high-quality composite image stored in the high-quality image storage unit and transmits it to the server 4 as a difference image.

The duplicate transmission prevention unit 55 prevents the server 4 from duplicately transmitting to the teacher terminal 2, among background images received from the student terminals 3, a background image that has already been transmitted to the teacher terminal 2 once. In this embodiment, when a monitoring request is made from the teacher terminal 2, the duplicate transmission prevention unit 55 checks the background images transmitted from all student terminals 3 to be monitored. Then, if the same background image is being used on multiple student terminals 3, the background image is transmitted only once.

In this embodiment, the data sent from the student terminal 3 to the server 4 includes, in addition to the image data (difference image or low-quality composite image), a student ID that identifies the student, a notebook ID that identifies the notebook screen, a page number that identifies the page of the notebook screen, an image type that identifies whether the image data is a difference image or a low-quality composite image, and an image URL (Uniform Resource Locator) for the teacher terminal 2 to download the image data.

Meanwhile, the data sent from the server 4 to the teacher terminal 2 includes the above-mentioned student ID, notebook ID, page number, image type, image URL, as well as the creation date and time of the image data and the last update date and time. The above data for all student terminals 3 to be monitored is sent to the server 4.

When executing the monitoring function, the differential image creation unit 52 creates a differential image of the newly written portion within a predetermined time interval on the student terminal 3. In this embodiment, the differential image creation unit 52 acquires all writings on the student layer at a predetermined time interval, compares it with the writing image stored in the writing image storage unit 33 (the writing image before the predetermined time has passed), and creates a differential image of the newly written portion. Specifically, if the previous pixel information and new pixel information for each pixel in the writing image are the same, the pixel is made transparent, so that only the newly added portion remains, forming a differential image.

The data size calculation unit 53 calculates the data size of the image to be transmitted from the student terminal 3 to the server 4 when executing the monitoring function. Specifically, the data size calculation unit 53 calculates the data size of a low-quality composite image obtained by combining and compressing the background image, the writing image, and the difference image, and the data size of the uncompressed difference image alone.

The student image acquisition unit 49 acquires image data of each student terminal 3 from the server 4. In this embodiment, the student image acquisition unit 49 first acquires from the server 4 the background image and the writing image transmitted from each of all student terminals 3 to be monitored. The student image acquisition unit 49 then accesses the server 4 at a predetermined time interval and acquires a low-quality composite image or difference image for each student terminal 3. Then, when a difference image is received from the server 4, the image obtained by combining the difference image with the writing image stored in the writing image storage unit 33 is saved as a new writing image.

In addition, in this embodiment, as described above, the data transmitted from the server 4 to the teacher terminal 2 includes the last update date and time of the image data, etc. Therefore, when acquiring image data from the server 4, the student image acquisition unit 49 downloads the image data from the server 4 only if the last update date and time of the image has been updated. On the other hand, if the last update date and time has not been updated, the image data is not downloaded, thereby reducing the amount of data communication.

The student image display unit 50 displays the note screen on each student terminal 3. In this embodiment, when the student image display unit 50 receives a low-quality composite image from the server 4, it decodes the low-quality composite image before compression and displays it as a note screen. On the other hand, when the student image display unit 50 receives a difference image from the server 4, it composites the difference image with the background image and the writing image and displays it as a note screen.

Next, the functions of the online class support system 1, online class support program 1a, and online class support method of this embodiment will be described.

First, when an online class is conducted using the note sharing function of this embodiment, as shown in FIG. 7, the teacher terminal 2 requests the server 4 to share the note screen by specifying the user ID, page number, etc. of the student terminal 3 with which the note screen is to be shared (step S1). Upon receiving this request, the server 4 issues an instruction to display the specified note screen (step S3) if the specified student terminal 3 allows sharing of the note screen (step S2).

As a result, the touch panel 10 of the student terminal 3 displays a note screen identical to the note screen displayed on the touch panel 10 of the teacher terminal 2 (step S4). Note that in the following explanation, an example is described in which writings on the note screen of the teacher terminal 2 are reflected on the note screen of the student terminal 3, but by reversing the processing subject, writings on the note screen of the student terminal 3 can be reflected on the note screen of the teacher terminal 2.

When writing is started on the notebook screen of the teacher terminal 2 while the notebook screen is shared between the teacher terminal 2 and the student terminal 3 (step S5: YES), the stroke ID issuing unit 41 issues a stroke ID (step S6: stroke ID issuing step), and the writing information acquiring unit 42 acquires the writing information (step S7: writing information acquiring step). Then, the point sequence data consisting of the stroke ID and the writing information is transmitted to the server 4 by the point sequence data transmitting unit 43 (step S8: point sequence data transmitting step).

After that, in the teacher terminal 2, each time a predetermined time has elapsed (step S9: YES), it is determined whether or not writing is continuing (step S10). Then, as long as writing is continuing (step S10: YES), the writing information acquisition unit 42 acquires the writing information (step S7) and continues to transmit the information as point sequence data to the server 4 (step S8). As a result, the point sequence data relating to one stroke of writing is transmitted to the server 4 with the same stroke ID assigned.

On the other hand, when writing of one stroke is completed (step S10: NO), while the notebook sharing function is being executed (step S11: NO), the process returns to step S5, and the above-mentioned processes from step S6 to step S10 are executed each time new writing is started. As a result, the writing on the notebook screen of the teacher terminal 2 is transmitted to the server 4 as point sequence data in which a different stroke ID is assigned to each stroke.

The server 4 receives the point sequence data transmitted from the teacher terminal 2 at a predetermined time interval (step S12) and stores the data in the point sequence data storage unit 35 in sequence (step S13). As a result, the server 4 always stores the latest point sequence data for reproducing the writing on the notebook screen of the teacher terminal 2.

Meanwhile, while the notebook screen is being shared with the teacher terminal 2, on the student terminal 3, the point sequence data acquisition unit 44 accesses the server 4 at a predetermined time interval and acquires the point sequence data of the teacher terminal 2 that is sharing the notebook screen (step S14: point sequence data acquisition step). Then, the writing reproduction unit 45 reproduces the writing on the teacher terminal 2 on the touch panel 10 of the student terminal 3 based on the writing information with the same stroke ID (step S15: writing reproduction step).

After that, on the student terminal 3, unless the page request unit 46 requests a page different from the currently displayed notebook screen (step S16: NO), the point sequence data acquisition unit 44 acquires point sequence data from the server 4 (step S14) and reproduces the writing (step S15) every time a predetermined time interval elapses (step S17: YES). As a result, when writing is made on the notebook screen of the teacher terminal 2 as shown in Figure 8(a), the writing by the teacher is also reproduced in real time on the notebook screen of the student terminal 3 as shown in Figure 8(b).

In addition, in this embodiment, the writing reproduction unit 45 connects a series of points consisting of intermittent coordinate groups (writing positions) by interpolating them with a cubic Bezier curve. This allows the teacher's writing to be displayed on the notebook screen as a continuous, smooth curve. Therefore, even the movements of the stylus pen and fingers when writing on the notebook screen of the teacher terminal 2 are reproduced with high accuracy on the notebook screen of the student terminal 3.

In this embodiment, a notebook sharing function is executed between one teacher terminal 2 and multiple student terminals 3. Therefore, writings on the teacher terminal 2 are simultaneously reproduced on the notebook screens of all the student terminals 3. On the other hand, writings on each student terminal 3 are different from each other, so they are not reproduced on the notebook screen of the teacher terminal 2. However, this configuration is not limited to this, and in cases where the teacher terminal 2 and the student terminal 3 share a notebook screen on a one-to-one basis, all writings on each terminal may be simultaneously reproduced on the notebook screens of both terminals.

On the other hand, when a page other than the currently displayed note screen is requested on the student terminal 3 (step S16: YES), a page jump process is executed (step S18). Specifically, as shown in FIG. 9, first, the page request unit 46 transmits the specified page number to the server 4 (step S21), and when it is received by the server 4 (step S22), the point sequence data compression unit 54 acquires all point sequence data stored in association with the page from the point sequence data storage unit 35 (step S23).

Next, the point sequence data compression unit 54 converts the second and subsequent coordinate groups of the time series coordinates indicating the writing positions included in each acquired point sequence data into relative coordinates with respect to the previous coordinates (step S24), and converts each of the relative coordinates into a single character or symbol (step S25). This significantly compresses the data size of the point sequence data, reducing the amount of communication when sending it to the teacher terminal 2 and the student terminal 3, and suppressing the load on the communication network.

The compressed dot sequence data is sent to each of the teacher terminal 2 and student terminal 3 sharing the notebook screen together with the background image corresponding to the specified page (step S26). Meanwhile, when each of the teacher terminal 2 and student terminal 3 receives the background image and compressed dot sequence data from the server 4 (step S27), the dot sequence data decoding unit 47 decodes the dot sequence data back to its original state (step S28), and displays all writings on the background image at once based on the dot sequence data (step S29).

As a result, even if the previous writings consist of hundreds of strokes and tens of thousands of dots, the specified note screen can be smoothly reproduced in a short time along with the previous writings without significantly increasing the load on the communication network.

Next, the process of conducting an online class using the monitoring function of this embodiment will be described with reference to Fig. 10 and Fig. 12. In the flowcharts of Fig. 10 and Fig. 12, various types of image data are represented by the following alphabets for the sake of simplicity.
A: Background image B: Writing image C: Difference image for B D: High-quality composite image (B+C) combining the writing image and the difference image
E: Difference image to D

As shown in FIG. 10, when an online class starts, on the student terminal 3, the display control unit 48 combines background image A of the background layer and writing image B of the student layer to display the notebook screen (step S31), and the image sending unit 51 sends the background image A and writing image B to the server 4 (step S32).

As a result, when the server 4 receives background image A and writing image B from each student terminal 3 (step S33), it associates each image data with each student terminal 3 and stores them in the background image storage unit 32 and writing image storage unit 33 (step S34). In this state, when the teacher terminal 2 requests monitoring from the server 4 (step S35), the duplicate transmission prevention unit 55 determines whether background image A has been transmitted to all student terminals 3 to be monitored (step S36).

If the result of the determination is that there is an unsent background image A (step S36: NO), it is sent to the teacher terminal 2 (step S37) and the writing image B is also sent (step S38). On the other hand, if background image A has already been sent (step S36: YES), only the writing image B is sent (step S38). This prevents the server 4 from sending duplicate background images A to the teacher terminal 2, thereby reducing the amount of communication.

Next, on the teacher terminal 2, the student image acquisition unit 49 receives background image A and writing image B for all student terminals 3 to be monitored from the server 4 (step S39), and stores the image data in the background image storage unit 32 and writing image storage unit 33 in association with each student terminal 3 (step S40). The student image display unit 50 then combines and displays the background image A and writing image B for each student terminal 3 (step S41).

As a result, the touch panel 10 of the teacher terminal 2 displays a list of the note screens of all the monitored student terminals 3 in real time, as shown in FIG. 11. Note that in FIG. 11, the display sizes of the note screens are set to three sizes, large, medium, and small, depending on the level of attention to the students, but this is not limited to this configuration, and all note screens may be displayed at the same size.

On the other hand, on the student terminal 3, after first transmitting the background image A and the writing image B to the server 4 (step S32), the difference image creation unit 52 acquires all writings on the student layer (step S43) every time a predetermined time has elapsed (step S42: YES), and creates a difference image C of the newly written portion by comparing it with the writing image B stored in the writing image storage unit 33 (step S44).

Then, the data size calculation unit 53 calculates the data size of a low-quality composite image obtained by combining and compressing the three images, background image A, writing image B, and difference image C, and the data size of only the uncompressed difference image C (step S45), and determines the image data to be transmitted to the server 4. In addition, the image obtained by combining the writing image B and the difference image C is stored in the writing image storage unit 33 as a new writing image B (step S46).

Then, the image transmission unit 51 transmits to the server 4 either the low-quality composite image or the difference image C, whichever has the smaller data size calculated in step S45. That is, if the low-quality composite image is smaller (step S47: NO), the low-quality mode is selected, and if the previous mode was also low-quality mode (step S48: NO), the low-quality composite image is transmitted to the server 4 (step S50). On the other hand, if the previous mode was high-quality mode (step S48: YES), an image obtained by combining the written image B and the difference image C is stored separately as high-quality composite image D in the high-quality composite image storage unit 34 (step S49), and the low-quality composite image is then transmitted to the server 4 (step S50).

On the other hand, if the data size calculated in step S45 is smaller for difference image C (step S47: YES), the mode becomes high quality, and if the previous mode was also high quality (step S51: NO), difference image C is sent to server 4 as is (step S53). On the other hand, if the previous mode was low quality (step S51: YES), the newly written portion is compared with high quality composite image D and sent as difference image E (step S52).

As a result, while a low-quality composite image is being transmitted in low-quality mode, the server 4 and teacher terminal 2 are unable to obtain a high-quality difference image during that time, but when the high-quality mode is switched back on, a difference image E based on the written image D before the low-quality mode was switched on is transmitted. Therefore, even if the high-quality mode and low-quality mode are frequently switched on and off, the teacher terminal 2 can accurately reproduce a high-quality composite image, as described below.

Meanwhile, as shown in FIG. 12, the server 4 receives low-quality composite images in low-quality mode or difference images C and E in high-quality mode from each of the student terminals 3 at a predetermined time interval (step S54), and these image data are associated with each student terminal 3 and stored sequentially in the monitoring image storage unit 36 (step S55).

On the other hand, the teacher terminal 2 that requested monitoring composites and displays the background image A and the writing image B for each student terminal 3 (step S41), and then each time a predetermined time has elapsed (step S56: YES), the student image acquisition unit 49 accesses the server 4 and acquires the low-quality composite image or the difference images C and E for each student terminal 3 (step S57).

At this time, in this embodiment, the student image acquisition unit 49 downloads from the server 4 only image data with updated writing, and does not download image data with no updated writing, thereby reducing the load on the communication network.

If the image obtained from the server 4 is a low-quality composite image (step S58: A+B+C after compression), the student image display unit 50 decodes and displays the low-quality composite image (step S59). If the image obtained from the server 4 is a difference image C (step S58: C), the student image display unit 50 combines the background image A shown in FIG. 13(a), the writing image B shown in FIG. 13(b), and the difference image C shown in FIG. 13(c), and displays it as a note screen (A+B+C) as shown in FIG. 13(d) (step S60). Then, the image obtained by combining the writing image B and the difference image C is saved as a new writing image B (step S61).

Similarly, if the image acquired from the server 4 is difference image E (step S58: E), the student image display unit 50 composites the difference image E with the background image A and the writing image B to display the result as a notebook screen (A+B+E) (step S62). Then, the composite image of the writing image B and the difference image E is saved as a new writing image B (step S63).

This reduces the amount of communication when the teacher terminal 2 monitors the notebook screens of multiple student terminals 3 in real time, while maintaining high image quality. Even if high-image-quality mode and low-image-quality mode are switched between from moment to moment, the high-image-quality image immediately before switching to low-image-quality mode is saved, and the difference image during low-image-quality mode is saved separately, so that the notebook screen of each student terminal 3 can be reproduced reliably and accurately.

When a student is selected by touching or otherwise selecting one of the notebook screens of the student terminals 3 displayed in a list on the teacher terminal 2 while the monitoring function is being executed (step S64: YES), the above-mentioned notebook sharing function is executed between the student terminal 3 of the selected student and the teacher terminal 2. This allows the teacher to write hints and advice individually on the notebook screen of any student who needs personal guidance during monitoring.

On the other hand, unless a student is selected on the teacher terminal 2 that is executing the monitoring function (step S64: NO), the process returns to step S56, and each time a predetermined time has elapsed (step S56: YES), the student image acquisition unit 49 accesses the server 4 and acquires image data for each student terminal 3 (step S57), thereby reproducing the notebook screen of each student terminal 3 in real time.

According to the present embodiment described above, the following effects are obtained.
1. Writings on the notebook screen of another terminal can be reproduced on the notebook screen of the own terminal in real time, making it possible to conduct online lessons with excellent interactivity and real-time performance between the teacher terminal 2 and the student terminal 3.
2. Teachers can see students' hand movements in real time, making it easier for them to grasp students' status, such as their level of understanding and concentration in class.
3. Students can see what the teacher writes on the board in real time on their own devices, eliminating the need to copy what is written on the board, improving their understanding of the lesson and their concentration.
4. It is possible to reduce the load on the communication network when displaying a note screen on which notes have been written in the past.
5. The point sequence data compressed by the server 4 can be accurately decoded.
6. It is possible to reduce the amount of communication when the teacher terminal 2 displays a list of the notebook screens of a plurality of student terminals 3 in real time, and to suppress deterioration of image quality.
7. It is possible to prevent duplicate transmission from the server 4 to the teacher terminal 2 and reduce the amount of communication.

The online class support system 1, online class support program 1a, and online class support method according to the present invention are not limited to the above-described embodiments, and can be modified as appropriate.

LIST OF SYMBOLS 1 Online class support system 1a Online class support program 2 Teacher terminal 3 Student terminal 4 Server 10 Touch panel 20 Communication means 30 Storage means 31 Program storage section 32 Background image storage section 33 Handwritten image storage section 34 High-quality composite image storage section 35 Point sequence data storage section 36 Monitoring image storage section 40 Arithmetic processing means 41 Stroke ID output section 42 Handwritten information acquisition section 43 Point sequence data transmission section 44 Point sequence data acquisition section 45 Handwritten reproduction section 46 Page request section 47 Point sequence data decoding section 48 Display control section 49 Student image acquisition section 50 Student image display section 51 Image transmission section 52 Difference image creation section 53 Data size calculation section 54 Point sequence data compression section 55 Duplicate transmission prevention section

Claims (7)

An online class support system that supports online classes conducted between a teacher terminal and a student terminal via a server,
The teacher terminal and the student terminal have a note sharing function for displaying the same note screen in real time on the touch panel of each of the terminals.
Each of the teacher terminal and the student terminal has
a stroke ID issuing unit that issues a stroke ID for identifying a writing each time writing is started on the notebook screen of the terminal;
a writing information acquiring unit that acquires writing information including a writing position and a writing time related to the writing at a predetermined time interval while the writing continues;
a point sequence data transmission unit that transmits point sequence data consisting of the stroke ID and the writing information to the server at a predetermined time interval;
a point sequence data acquisition unit that acquires the point sequence data transmitted from another terminal from the server at a predetermined time interval;
a writing reproduction unit that reproduces the writing on the other terminal on the touch panel of the own terminal in real time based on the writing information having the same stroke ID every time the point sequence data acquisition unit acquires the point sequence data;
An online teaching support system. The online class support system according to claim 1, wherein the server, when a request is made from the teacher terminal or the student terminal to display the notebook screen on which writing has been previously made, acquires the point sequence data relating to all writings made on the notebook screen, converts the second and subsequent coordinate groups of the time-series coordinates indicating the writing positions included in each point sequence data into relative coordinates with respect to the previous coordinates, and has a point sequence data compression unit that converts each of the relative coordinates into a single character or symbol. The online class support system according to claim 2, wherein each of the teacher terminal and the student terminal has a dot sequence data decoding unit that converts each of the characters or symbols into relative coordinates when it acquires the dot sequence data compressed by the dot sequence data compression unit, and sequentially decodes the second and subsequent relative coordinates into time-series coordinates indicating the writing position based on the first coordinate indicating the writing position. The teacher terminal has a monitoring function for displaying a list of notebook screens of the multiple student terminals in real time on a touch panel of the teacher terminal;
The student terminal includes:
a display control unit that displays the notebook screen by combining a background layer having a background image and a student layer that records writings by students;
a writing image storage unit that stores all writings written in the student layer at a predetermined time interval as writing images;
a difference image creation unit that acquires all writings on the student layer at a predetermined time interval, compares the writing image with the writing image, and creates a difference image of the newly written portion;
a data size calculation unit that calculates a data size of a low-quality composite image obtained by combining and compressing the background image, the writing image, and the difference image, and a data size of the difference image;
an image transmission unit that first transmits the background image and the writing image to a server, and then transmits, at predetermined time intervals, one of the low-quality composite image and the difference image, whichever has a smaller data size, to the server;
a high-quality composite image storage unit that stores a high-quality composite image obtained by combining the writing image and the difference image when the image transmission unit transmits the low-quality composite image after transmitting the difference image;
It has
When transmitting the difference image after transmitting the low-quality composite image, the image transmission unit transmits a newly written portion as the difference image by comparing it with the high-quality composite image, and
The teacher terminal includes:
a student image acquisition unit that first acquires from the server the background image and the handwritten image transmitted from each of the student terminals, and then acquires the low-quality composite image or the difference image for each of the student terminals at a predetermined time interval;
a student image display unit that, when receiving the low-quality composite image from the server, decodes the low-quality composite image and displays it as a notebook screen, and, when receiving the difference image from the server, composites the difference image with the background image and the writing image and displays it as a notebook screen;
It has
when the difference image is received from the server, an image obtained by combining the writing image and the difference image is stored as a new writing image;
4. The online class support system according to claim 1. The online class support system according to claim 4, wherein the server has a duplicate transmission prevention unit that does not transmit to the teacher terminal the background image that has been once transmitted to the teacher terminal among the background images received from the student terminal. An online class support program for supporting online classes conducted between a teacher terminal and a student terminal via a server,
The teacher terminal and the student terminal have a note sharing function for displaying the same note screen in real time on the touch panel of each of the terminals.
a stroke ID issuing unit that issues a stroke ID for identifying a writing each time writing is started on the notebook screen of the terminal;
a writing information acquiring unit that acquires writing information including a writing position and a writing time related to the writing at a predetermined time interval while the writing continues;
a point sequence data transmission unit that transmits point sequence data consisting of the stroke ID and the writing information to the server at a predetermined time interval;
a point sequence data acquisition unit that acquires the point sequence data transmitted from another terminal from the server at a predetermined time interval;
a writing reproduction unit that reproduces the writing on the other terminal on the touch panel of the own terminal in real time based on the writing information having the same stroke ID every time the point sequence data acquisition unit acquires the point sequence data;
This is an online class support program that enables computers to function. An online class support method for supporting an online class conducted between a teacher terminal and a student terminal via a server, comprising:
The teacher terminal and the student terminal have a note sharing function for displaying the same note screen in real time on the touch panel of each of the terminals.
a stroke ID issuing step of issuing a stroke ID for identifying a writing each time writing is started on the notebook screen of the terminal;
a writing information acquiring step of acquiring writing information including a writing position and a writing time related to the writing at a predetermined time interval while the writing continues;
a point sequence data transmission step of transmitting point sequence data consisting of the stroke ID and the writing information to the server at a predetermined time interval;
a point sequence data acquisition step of acquiring the point sequence data transmitted from another terminal from the server at a predetermined time interval;
a writing reproduction step of reproducing the writing on the other terminal on the touch panel of the own terminal in real time based on the writing information having the same stroke ID every time the point sequence data is acquired in the point sequence data acquisition step;
A method for supporting online classes.

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