CN106919333B - Method and device for recording writing content on electronic writing board - Google Patents
Method and device for recording writing content on electronic writing board Download PDFInfo
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- CN106919333B CN106919333B CN201710092117.0A CN201710092117A CN106919333B CN 106919333 B CN106919333 B CN 106919333B CN 201710092117 A CN201710092117 A CN 201710092117A CN 106919333 B CN106919333 B CN 106919333B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0428—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual
Abstract
The invention discloses a method and a device for recording writing contents on an electronic writing board, which relate to the field of infrared touch screens, and the method comprises the following steps: determining the ratio of the area of an erased area in the writing content to the total area corresponding to the writing content, and the display time corresponding to the writing content of the erased area; searching a preset target ratio according to the display time; comparing the ratio with the target ratio and judging whether the writing content of the page needs to be stored or not; if the ratio is larger than the target ratio, recording the writing content as a page of the blackboard writing; otherwise, no recording is made. Therefore, the user can automatically record and store the blackboard-writing content without clicking corresponding erased and stored keys or icons, the operation continuity of the user is ensured, and the sharing of the blackboard-writing content is facilitated.
Description
Technical Field
The invention relates to the field of infrared touch screens, in particular to a method and a device for recording writing contents on an electronic writing board.
Background
At present, the electronic writing board is widely applied to teaching. Fig. 1 is a schematic structural diagram of an electronic writing board in the related art, and as shown in fig. 1, the electronic writing board includes a writing board 11 and a touch screen disposed in the writing board 11 and electrically connected to a computer 13, the touch screen includes an infrared touch frame 12 disposed around the writing board 11, the infrared touch frame 12 is provided with infrared emission receiving geminate transistors for recognizing touch operations, and the computer can synchronously display and record writing contents on the writing board. When a finger, a chalk, a writing pen or other touch objects are used for writing contents on the electronic writing board, the touch screen converts a touch track corresponding to a touch coordinate of the touch object on the touch screen into an electric signal and transmits the electric signal to the computer, and the computer records the touch track and displays the writing contents corresponding to the touch track.
In order to implement the function of erasing or saving the written content, one side of the writing board 11 is provided with a function key 14 electrically connected with the computer 13, or a touch screen is provided with a corresponding function icon for erasing or saving.
However, in practical use, when a user needs to erase or save written content, no matter whether the user individually configures keys or designs corresponding function icons, the user must click the corresponding keys or icons, which often interrupts the continuous operation of the user and affects the user experience.
Disclosure of Invention
The embodiment of the invention provides a method and a device for recording writing contents on an electronic writing board, which can realize automatic recording and storage of the writing contents without clicking corresponding function keys or icons, ensure the operation continuity of a user and improve the user experience.
In order to achieve the purpose, the embodiment of the invention adopts the technical scheme that:
in a first aspect, a recording method for writing on an electronic writing board is provided, the method comprising the steps of:
determining the ratio of the area of an erased area in the writing content to the total area corresponding to the writing content, and the display time corresponding to the writing content of the erased area;
searching a preset target ratio according to the display time;
if the ratio is larger than the target ratio, recording the writing content as a page of the blackboard writing; otherwise, no recording is made.
In a second aspect, there is provided a recording apparatus for writing on an electronic writing board, the apparatus comprising:
the determining unit is used for determining the ratio of the area of the erased area in the written content to the total area corresponding to the written content and the display time corresponding to the written content of the erased area;
the searching unit is used for searching a preset target ratio according to the display time;
the recording unit is used for recording the writing content as a page book if the ratio is larger than the target ratio; otherwise, no recording is made.
The embodiment of the invention provides a recording method and a recording device for writing contents on an electronic writing board, wherein the ratio of the area corresponding to the writing contents of an erased area to the total area corresponding to the written contents and the display time corresponding to the writing contents of the erased area are determined; then searching a preset target ratio according to the display time; then comparing the ratio with the target ratio and judging whether the writing content of the page needs to be recorded; and if the ratio is larger than the target ratio, recording the writing content as a page of the blackboard writing, otherwise, not recording.
Therefore, the user does not need to click corresponding function keys or icons, and can directly realize automatic recording and storage of the written content according to the comparison result of the ratio and the target ratio, so that the operation continuity of the user is ensured, and the user can conveniently share the blackboard-writing content.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural view of an electronic writing board in the related art.
Fig. 2 is a flow chart of a recording method for writing contents on an electronic writing board according to the present invention.
Fig. 3 is a detailed flowchart of step S11 shown in fig. 2.
FIG. 4 is a graph illustrating a target ratio as a function of display time for the contents of the erased area.
FIG. 5 is a graph illustrating a target ratio versus display time for a written content of an erased area.
Fig. 6 is a schematic diagram of a recording device for writing on an electronic writing board according to the present invention.
Fig. 7 is a schematic diagram of a portion of the determination unit shown in fig. 6.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The concept of the invention is as follows: the longer the erased written content is displayed on the electronic writing board, the larger the area for erasing the written content is, the more useful the current page is generally considered to be, and the current page needs to be saved in a picture form so as to facilitate the follow-up review and sharing of the written content. Further, the inventors set a curve: and (3) a function curve between the target ratio and the display time of the written content of the erased area on the electronic writing board, wherein the content on the curve is useful information and needs to be recorded and saved. Therefore, the ratio of the area corresponding to the written content of the erased area to the total area corresponding to the written content is determined, and the preset target ratio of the written content of the erased area to the display time is calculated according to the function curve; and then judging whether the page of writing content is recorded or not by comparing the ratio with the target ratio.
Example one
Referring to fig. 2, fig. 2 is a flow chart of a recording method for writing contents on an electronic writing board according to the present invention. In order to ensure continuous operation of a user and achieve automatic recording and saving of written content without clicking corresponding function keys or icons, embodiments of the present invention provide a method for recording written content on an electronic tablet, which can be applied to the electronic tablet shown in fig. 1, a touch device, an interactive touch all-in-one machine, and the like.
The method may comprise the steps of:
step S11: and determining the ratio of the area of the erased area in the written content to the total area corresponding to the written content, and the display time corresponding to the written content of the erased area.
In this step, it is preferable to use a ratio of the number of touch coordinate points corresponding to the written content in the erasing mode to the number of touch coordinate points corresponding to the written content in the writing mode to indicate a ratio of an area of an erased area in the current written content to a total area corresponding to the written content. Of course, other ways to express the ratio may be adopted, such as the ratio of the area of the erased area corresponding to the written content in the erasing mode to the area of the written area corresponding to the written content in the writing mode, which is not limited herein.
Preferably, the display time corresponding to the written content of the erased area is represented by an average value of display times of the touch coordinate points on the electronic writing board, among the touch coordinate points corresponding to the written content of the erased area. Of course, the display time corresponding to the writing content of the erased area may be represented by a weighted value or a maximum value of the display time of each touch coordinate point on the electronic writing board, and the display time is not limited in this embodiment.
On the basis of the above fig. 2, the embodiment of the present invention further discloses a detailed flowchart of step S11, and as shown in fig. 3, step S11 may include the following steps:
step S111: acquiring a touch coordinate point and a touch area formed by a touch object on the electronic writing board;
the writing content on the electronic writing board can be characters, numbers, symbols, figures and the like. In this step, a coordinate system is established for the electronic writing board, for example: the method comprises the steps of taking the center or any angle of an electronic writing board as an original point, taking the horizontal direction as an X axis and taking the vertical direction as a Y axis, and acquiring a touch coordinate point and a touch area corresponding to writing contents on the electronic writing board by detecting touch operation on a touch screen in the electronic writing board.
Step S112: if the current touch area is smaller than a preset touch area threshold value, the writing mode is adopted, and meanwhile the number N of touch coordinate points corresponding to the written content in the writing mode is recorded1And writing time t of each touch coordinate pointn(ii) a Otherwise, in the erasing mode, recording the number N of touch coordinate points corresponding to the written content in the erasing mode2And erasing time T of each touch coordinate pointn；
Step S113: the number N of touch coordinate points corresponding to the written content in the erasing mode2The number N of touch coordinate points corresponding to the writing contents in the writing mode1And determining the ratio P of the area of the erased area in the written content to the total area corresponding to the written content.
Illustratively, a preset touch area threshold value is set as S, and the touch area threshold value S is between the area of a writing pen used by a user and the area of a blackboard eraser and is pre-stored in a fixed storage space of a computer for being called at any time.
When a user uses a writing pen to perform touch operation on the electronic writing board, the current touch area is judged to be smaller than a preset touch area threshold value S, the electronic writing board is in a writing mode, and meanwhile the number N of touch coordinate points corresponding to writing content in the mode is recorded1And writing time t of each touch coordinate pointn. When a user uses the blackboard eraser to perform touch operation on the electronic writing board, and the current touch area is judged to be larger than a preset touch area threshold value S, the electronic writing board is in an erasing mode, and the number N of touch coordinate points corresponding to writing content in the erasing mode is recorded2And erasing time T of each touch coordinate pointn. Then, it is determined that the ratio of the area of the erased area in the written content to the total area corresponding to the written content is P = N2/N1，0≤P≤1。
Step S114: according to the writing time t of each touch coordinate pointnAnd an erase time TnAnd determining the average display time of each touch coordinate point on the electronic writing board as the display time delta t corresponding to the writing content of the erased area.
Specifically, the display time Δ t is:
wherein m represents the number of all touch coordinate points corresponding to the whole page of writing content, and n is more than or equal to 1 and less than or equal to m.
For example, assuming that a user needs to erase an area on the electronic tablet, where the area includes 5 touch coordinate points, and the display time of the 5 touch coordinate points on the electronic tablet is 20 minutes, 18 minutes, 15 minutes, 14 minutes, and 10 minutes in this order, the display time Δ t = (20 +18+15+14+ 10)/5 =15.4 minutes corresponding to the writing content of the erased area.
It should be noted that the touch operation of the user on the electronic writing board is a touch operation of consecutive movements, for example: the writing of characters by a writing pen or the erasing of characters by a blackboard eraser is carried out, and the touch area of the initial touch position in the touch operation of the consecutive movement is acquired in the steps, such as: when the writing pen is ready to write, the writing pen presses the touch area of the electronic writing board when the writing pen is not moved. Furthermore, no matter whether the touch area of the user is always smaller than the preset touch area threshold value in the touch operation of the continuous movement, the content is written, so that the switching between the writing mode and the erasing mode can be quickly realized.
It should be further noted that the embodiment of the present invention is not limited to switching between the writing mode and the erasing mode by using the comparison result between the touch area and the preset touch area threshold. The writing pen or the blackboard eraser can be provided with a unique hardware ID number, the infrared emission receiving tube senses and captures the touch track and the corresponding hardware ID number of the writing pen or the blackboard eraser, and the touch track and the corresponding hardware ID number are sent to a computer which has application software and can identify different hardware ID numbers, so that the writing mode and the erasing mode can be switched rapidly, and the writing pen or the blackboard eraser is not limited.
Step S12: and searching a preset target ratio according to the display time.
And searching a target ratio in a preset display time and target ratio mapping table, wherein the larger the display time of the writing content of the erased area in the mapping table on the electronic writing board is, the smaller the corresponding target ratio is. This is due to: the larger the area of the erased area in the written content is, the longer the display time of the erased written content is, the current page is generally considered to be useful information, and needs to be saved in a picture form, so as to facilitate the subsequent review and sharing of the written content.
Specifically, referring to fig. 4, fig. 4 is a graph illustrating a target ratio as a function of display time for the content of the erased area. Here, assuming that the display time is at most 45 minutes of a class, preferably, the target ratio is in inverse proportional function relation with the display time of the writing content of the erased area on the electronic writing board, the target ratio is a ratio preset in the computer at the display time of the writing content of the erased area on the electronic writing board, and the inverse proportional function relation is:
wherein K is a constant, K>0；T0Is a constant number indicating that the touch coordinate point has T on the electronic writing board0Time, 0. ltoreq. T0The time for writing a full page of content is ≦. I.e. Δ T > T0，T0The present invention is to prevent the pages from being frequently saved and newly created at the initial stage of writing. P0Is a constant representing the ratio of the area corresponding to the written content of the erased area to the total area corresponding to the written content, 0 ≦ P0Is less than 1. I.e. P0＜
≤1。P0Mainly to prevent disturbing jitter, and to leave out operations for a long time to cause saving and creating a new page.
Further, the display time Δ t corresponding to the writing content of the erased area calculated in step S11 is substituted into the inverse proportional function equation to obtain the target ratio f (Δ t).
It should be noted that, in the embodiment of the present invention, various possible implementations may be adopted to calculate the corresponding display time of the written content of the erased area on the electronic writing board, which is not limited herein.
It should be noted that, in the embodiment of the present invention, the target ratio and the display time corresponding to the writing content of the erased area on the electronic writing board are set to be an inverse proportional function, and a linear function with a negative slope therebetween may also be set, referring to fig. 5, fig. 5 is another functional curve diagram of the target ratio and the display time corresponding to the writing content of the erased area, as long as a condition that the target ratio decreases with the increase of the display time corresponding to the writing content of the erased area is satisfied, which is not limited herein.
Step S13: if the ratio is larger than the target ratio, recording the writing content as a page of the blackboard writing; otherwise, no recording is made.
Specifically, if the ratio P is greater than the target ratio f (delta t), the computer records and stores the writing content on the current page as a blackboard writing, and updates the rest of the erased writing content to the newly-built page; otherwise, the written content on the current page is not recorded, and the rest of the erased written content is updated to the current page, at this time, the written content in the erased area can be wrongly written by the user or needs to be modified.
Further, the area above the function curve (shaded portion) in fig. 4 or fig. 5 can be roughly used to indicate that the current page is useful information and needs to be recorded and saved, and the area below the function curve can be used to indicate that there is a writing error or writing content needing to be modified on the current page.
The embodiment of the invention provides a recording method and a recording device for writing contents on an electronic writing board, wherein the ratio of the area corresponding to the writing contents of an erased area to the total area corresponding to the written contents and the display time corresponding to the writing contents of the erased area are determined; then searching a preset target ratio according to the display time; then comparing the ratio with the target ratio and judging whether the writing content of the page needs to be recorded; and if the ratio is larger than the target ratio, recording the writing content as a page of the blackboard writing, otherwise, not recording.
Therefore, the user does not need to click corresponding function keys or icons, and can directly realize automatic recording and storage of the written content according to the comparison result of the ratio and the target ratio, so that the operation continuity of the user is ensured, and the user can conveniently share the blackboard-writing content.
Example two
According to the method for recording the writing contents on the electronic writing board, the embodiment of the invention also provides a recording device for the writing contents on the electronic writing board, and the embodiment of the recording device for the writing contents on the electronic writing board is described in detail below.
Referring to fig. 6, fig. 6 is a schematic diagram of a recording apparatus for writing on an electronic writing board according to the present invention, where the recording apparatus may be disposed on the electronic writing board, a touch device, an interactive touch device, and the like, and the recording apparatus may include: a determination unit 61, a search unit 62, a recording unit 63.
The determining unit 61 is configured to determine a ratio of an area of the erased area in the written content to a total area corresponding to the written content, and a display time corresponding to the written content of the erased area.
Specifically, the ratio is preferably: the ratio of the number of touch coordinate points corresponding to the written content in the erasing mode to the number of touch coordinate points corresponding to the written content in the writing mode. The display time is preferably: displaying the average value of time on the electronic writing board by each touch coordinate point in the touch coordinate points corresponding to the writing content of the erased area; and the display time of each touch coordinate point is the difference between the erasing time and the writing time of the touch coordinate point.
Referring to fig. 7, fig. 7 is a schematic diagram of a portion of the determination unit shown in fig. 6. The determining unit 61 specifically includes:
an acquiring unit 611, configured to acquire a touch coordinate point and a touch area formed by a touch object on the electronic writing board;
a determining unit 612, configured to determine that the writing mode is a writing mode if the touch area is smaller than a preset touch area threshold, and record the number of touch coordinate points corresponding to writing content in the writing mode and writing time of each touch coordinate point; otherwise, in an erasing mode, recording the number of touch coordinate points corresponding to the written content in the erasing mode and the erasing time of each touch coordinate point;
a calculating unit 613, configured to determine, as the ratio, a ratio of the number of touch coordinate points in the erase mode to the number of touch coordinate points in the write mode, and determine, as the display time, an average value of differences between erase timings and write timings of the respective touch coordinate points.
Specifically, a coordinate system is established for the electronic writing board, and touch operation on a touch screen in the electronic writing board is detected to obtain a touch area and a touch coordinate point corresponding to writing content on the electronic writing board; further acquiring the number of touch coordinate points corresponding to the written content in the writing mode and the writing time of each touch coordinate point, and acquiring the number of touch coordinate points corresponding to the written content in the erasing mode and the erasing time of each touch coordinate point; and then determining the ratio and the display time.
And the searching unit 62 is configured to search a preset target ratio according to the display time.
And searching a target ratio in a preset display time and target ratio mapping table, wherein the larger the display time of the writing content of the erased area in the mapping table on the electronic writing board is, the smaller the corresponding target ratio is. Preferably, the target ratio is in inverse proportional function relation with the corresponding display time of the writing content of the erased area on the electronic writing board.
Specifically, referring to fig. 5 or fig. 6, the determining unit 61 calculates the corresponding display time of the writing content of the erased area on the electronic writing board, and substitutes the display time into the inverse proportional function formula to obtain the target ratio.
A recording unit 63, configured to record the written content as a board book if the ratio is greater than the target ratio; otherwise, no recording is made.
Specifically, if the ratio is larger than the target ratio, the computer records and stores the writing content on the current page as a blackboard writing, and updates the rest of the erased writing content to the newly-built page; otherwise, the written content on the current page is not recorded, and the rest of the erased written content is updated to the current page, at this time, the written content in the erased area can be wrongly written by the user or needs to be modified.
For further description of the recording apparatus for writing on an electronic writing board according to the second embodiment of the present invention, reference may be made to the detailed description of the recording method for writing on an electronic writing board according to the first embodiment, which will achieve similar principles and advantages, and thus, detailed description thereof will not be provided herein.
For convenience of description, the above devices are described as being divided into various units by function, and are described separately. Of course, the functions of the units may be implemented in the same software and/or hardware or in a plurality of software and/or hardware when implementing the invention.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware associated with computer program instructions, and the programs may be stored in a computer readable storage medium, and when executed, may include the processes of the embodiments described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A method for recording content written on an electronic writing board, the method comprising the steps of:
determining the ratio of the area of an erased area in the writing content to the total area corresponding to the writing content, and the display time delta t corresponding to the writing content of the erased area;
searching a preset target ratio f (delta t) according to the display time delta t, wherein the target ratio and the display time delta t corresponding to the writing content of the erased area are in an inverse proportional function relation, and the inverse proportional function relation is as follows:
wherein K is a constant, K > 0; t0 is a constant, 0 ≦ T0 ≦ time for writing a full page of content, T0 exists to prevent causing frequent saving and new creation of pages in the early stages of writing; Δ T > T0; p0 is a constant, 0 ≦ P0 < 1;
if the ratio is larger than the target ratio, recording the writing content as a page of the blackboard writing; otherwise, no recording is made.
2. The method according to claim 1, comprising in particular:
and searching the target ratio in a preset display time and target ratio mapping table, wherein the larger the display time in the mapping table is, the smaller the corresponding target ratio is.
3. The method according to any one of claims 1-2, wherein the determining a ratio of an area of an erased area in the written content to a total area corresponding to the written content, and a display time Δ t corresponding to the written content of the erased area specifically include:
acquiring a touch coordinate point and a touch area on the electronic writing board;
if the touch area is smaller than a preset touch area threshold value, determining the touch area is a writing mode, and recording the number of touch coordinate points and the writing time of each touch coordinate point in the writing mode; otherwise, in an erasing mode, recording the number of the touch coordinate points in the erasing mode and the erasing time of each touch coordinate point;
and determining the ratio of the number of the touch coordinate points in the erasing mode to the number of the touch coordinate points in the writing mode as the ratio, and determining the average value of the differences between the erasing time and the writing time of each touch coordinate point as the display time delta t.
4. A recording device for writing on an electronic writing board, comprising:
the determining unit is used for determining the ratio of the area of the erased area in the written content to the total area corresponding to the written content and the display time delta t corresponding to the written content of the erased area;
the searching unit is used for searching a preset target ratio f (delta t) according to the display time delta t, wherein the target ratio and the display time delta t corresponding to the writing content of the erased area are in an inverse proportional function relation, and the inverse proportional function relation is as follows:
wherein K is a constant, K > 0; t0 is a constant, 0 ≦ T0 ≦ time for writing a full page of content, T0 exists to prevent causing frequent saving and new creation of pages in the early stages of writing; Δ T > T0; p0 is a constant, 0 ≦ P0 < 1;
the recording unit is used for recording the writing content as a page book if the ratio is larger than the target ratio; otherwise, no recording is made.
5. The apparatus according to claim 4, wherein the target ratio is looked up in a preset mapping table of display time and target ratio, wherein the larger the display time in the mapping table is, the smaller the corresponding target ratio is.
6. The apparatus according to any one of claims 4-5, wherein the determining unit comprises:
the acquisition unit is used for acquiring a touch coordinate point and a touch area on the electronic writing board;
the judging unit is used for determining a writing mode if the touch area is smaller than a preset touch area threshold value, and recording the number of touch coordinate points and the writing time of each touch coordinate point in the writing mode; otherwise, in an erasing mode, recording the number of the touch coordinate points in the erasing mode and the erasing time of each touch coordinate point;
and the calculating unit is used for determining the ratio of the number of the touch coordinate points in the erasing mode to the number of the touch coordinate points in the writing mode as the ratio, and determining the average value of the difference between the erasing time and the writing time of each touch coordinate point as the display time delta t.
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| CN107403411A (en) * | 2017-07-27 | 2017-11-28 | 广州视源电子科技股份有限公司 | Writing on the blackboard recording method, device, equipment and computer-readable recording medium |
| CN107529031B (en) * | 2017-08-18 | 2021-06-11 | 广州视源电子科技股份有限公司 | Recording method, device, equipment and storage medium for blackboard writing process |
| CN107506719A (en) * | 2017-08-18 | 2017-12-22 | 广州视源电子科技股份有限公司 | Teaching board display methods, device, equipment and computer-readable recording medium |
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| CN108630030A (en) * | 2018-06-27 | 2018-10-09 | 重庆工业职业技术学院 | The demonstration equipment of Accounting Course and the demenstration method of Accounting Course |
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| CN104199608B (en) * | 2014-08-20 | 2019-01-04 | Tcl通讯（宁波）有限公司 | The method of quick open record and touch terminal on touching terminal |
| CN104778008A (en) * | 2015-04-15 | 2015-07-15 | 浙江工业大学 | Virtual writing system on basis of screen management and control |
| CN105955756A (en) * | 2016-05-18 | 2016-09-21 | 广州视睿电子科技有限公司 | Image erasing method and system |
| CN106293462B (en) * | 2016-08-04 | 2019-11-26 | 广州视睿电子科技有限公司 | A kind of character displaying method and device |
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