CN113345384B - Handwriting erasing method and system for handwriting board - Google Patents
Handwriting erasing method and system for handwriting board Download PDFInfo
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- CN113345384B CN113345384B CN202110594980.2A CN202110594980A CN113345384B CN 113345384 B CN113345384 B CN 113345384B CN 202110594980 A CN202110594980 A CN 202110594980A CN 113345384 B CN113345384 B CN 113345384B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/13338—Input devices, e.g. touch panels
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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Abstract
The invention provides a handwriting erasing method and a handwriting erasing system of a handwriting board, which are applied to a handwriting board combination consisting of the handwriting board and a handwriting pen provided with an erasing block, and comprise the following steps: generating coordinates for each handwriting point where the handwriting passes and storing the coordinates; acquiring and identifying an erasing signal; when the received erasing signal is a screen clearing signal, all the stored handwriting points are cleared; when the received erasing signal is an area erasing signal, judging whether a second handwriting generated after the area erasing signal is received can form a closed graph area, if so, erasing the handwriting in the closed graph area, and otherwise, re-identifying whether a new closed graph area is generated; the new local area erasing method can solve the problems of long time consumed by erasing a wiping block by one point and one-key clearing for removing the wiping block, and can quickly select and remove the area needing to be erased when a large area needs to be erased locally, so that a quick and accurate erasing effect is achieved.
Description
Technical Field
The invention relates to the technical field of handwriting boards, in particular to a handwriting erasing method and a handwriting erasing system of a handwriting board.
Background
At present, a great number of children on the market learn various toys, and for practicing writing and drawing of children, a product is popular with parents, namely a handwriting board, most of the handwriting boards display written contents in a liquid crystal display mode at present, all the contents are cleared in a weak current clearing mode, liquid crystal molecules are corrected by current, and therefore the effect of clearing a screen is achieved, and the handwriting board has a plurality of advantages, for example, the handwriting board uses a flexible liquid crystal pressure sensing technology, and the display principle is that external natural light is reflected, so that no radiation is generated; the handwriting board adopts colorful writing with bright and soft writing, no dazzling and no effort for reading; can be written by fingers or any hard objects, has no dust pollution, and is healthy and environment-friendly. Therefore, the handwriting board receives the pursuit of numerous parents and teachers and students.
In the prior art, when a handwriting board is used, writing errors or drawing errors can occur just like ordinary writing, so that correction and clearing functions are necessary, most of the handwriting boards appearing on the market support two correction modes, firstly, an erasing block similar to an eraser is arranged at the back of a handwriting pen, small-range erasing is performed through continuously reciprocating erasing actions, secondly, a screen clearing function is performed by one key, all writing contents are cleared, and when the two erasing modes meet the condition that the handwriting needs to be erased in a larger range but is not cleared in a full screen mode, the defects exist, so that a new handwriting erasing mode is urgently needed to be suitable for various erasing requirements.
Disclosure of Invention
Aiming at the defects in the technology, the invention provides a handwriting erasing method and a handwriting erasing system for a handwriting board, provides a new local area erasing method, can solve the problems of long time consumption of erasing blocks by one point and one-key screen clearing for removing the blocks, and can quickly select and remove the area needing to be erased when local erasing of a larger area is needed, thereby achieving quick and accurate erasing effect.
In order to achieve the above object, the present invention provides a handwriting erasing method for a writing pad, which is applied to a writing pad assembly composed of a writing pad and a writing pen with an erasing block, and comprises the following steps:
generating coordinates for each handwriting point through which the handwriting passes and storing the coordinates;
acquiring and identifying an erasing signal;
when the received erasing signal is a screen clearing signal, all the stored handwriting points are cleared;
when the received erasing signal is an erasing block signal, judging whether the coordinate of an erasing point where the erasing block passes is the same as any coordinate of the trace points, if so, determining to erase the handwriting at the erasing point, otherwise, not making any change;
and when the received erasing signal is an area erasing signal, judging whether a second handwriting generated after the area erasing signal is received can form a closed graph area, if so, erasing the handwriting in the closed graph area, and otherwise, re-identifying whether a new closed graph area is generated.
Specifically, the method comprises the following steps: and if so, erasing the handwriting in the closed graphic area, otherwise, re-identifying whether a new closed graphic area is generated, and simultaneously and automatically clearing the generated second handwriting after the judgment is finished.
Specifically, the method comprises the following steps: and in the step of judging whether the second handwriting generated after the region erasing signal is received can form the closed graph region, identifying whether the coordinate passed by each stroke point of the second handwriting is an adjacent continuous coordinate position, if so, judging that the closed graph region can be formed, and if not, judging that the closed graph region cannot be formed.
Preferably, the method comprises the following steps: and in the step of identifying whether the coordinate passed by each trace point of the second handwriting is an adjacent continuous coordinate position or not, judging whether the coordinate position of the non-adjacent trace point is a coordinate point in another continuous trace point capable of forming a closed graph area or not when the coordinate position of the non-adjacent trace point is identified, and if not, clearing the handwriting formed by the trace points at the coordinate positions when the judgment is finished.
Preferably, the method comprises the following steps: in the step of acquiring and recognizing the erase signal, when generation of a new erase signal is recognized, the new erase signal overwrites and cancels the original erase signal, and the erase command is executed in a mode of the new erase signal.
A handwriting erasing system of a handwriting board comprises the handwriting board and a handwriting pen provided with an erasing block, wherein the handwriting board comprises a signal detection unit, a processing unit and a storage device, a pen point of the handwriting pen is provided with a first pressure sensor, the erasing block is provided with a second pressure sensor, the handwriting pen is also provided with a sum signal generator, when the handwriting pen performs writing, the first pressure sensor triggers the signal generator to send a writing signal to the handwriting board, and the handwriting board signal detection unit detects the writing signal and generates coordinates of each handwriting point through which handwriting of the handwriting pen passes and stores the coordinates to the storage device;
the signal detection unit acquires and identifies an erasing signal;
the handwriting board is provided with a screen clearing key, when the screen clearing key is triggered, the signal detection unit receives a screen clearing signal and transmits the screen clearing signal to the processing unit, and the processing unit controls the storage to clear all the stored handwriting points;
when the erasing block is contacted with the handwriting board and the second pressure sensor is triggered, the handwriting pen transmits an erasing block signal to the signal detection unit through the signal generator, the signal detection unit transmits the erasing block signal to the processing unit, the processing unit judges whether the coordinate of an erasing point where the erasing block passes is the same as any coordinate of the trace points, if so, the handwriting at the erasing point is determined to be erased in the storage, otherwise, no change is made;
the handwriting pen is provided with an area erasing key, when the area erasing key is triggered, the handwriting pen transmits an area erasing signal to the signal detection unit through the signal generator, the signal detection unit transmits the area erasing signal to the processing unit, the processing unit judges whether a second handwriting generated by the handwriting board after the area erasing signal is received can form a closed graph area, if so, the processing unit erases the handwriting in the closed graph area from the storage, otherwise, the handwriting board is identified again whether a new closed graph area is generated.
Specifically, the method comprises the following steps: the processing unit clears the second handwriting while performing the determination of the closed region.
Specifically, the method comprises the following steps: and a recognition module in the processing unit specifically recognizes whether the coordinate passed by each stroke point of the second handwriting is an adjacent continuous coordinate position, if so, the closed graph area is judged to be formed, and if not, the closed graph area is judged not to be formed.
Preferably, the method comprises the following steps: when the recognition module recognizes the coordinate positions of the non-adjacent stroke points, whether the coordinate positions are the coordinate points in another continuous stroke point capable of forming the closed graph area is judged, and if not, the processing unit controls the storage to clear the handwriting formed by the stroke points at the coordinate positions.
Preferably, the method comprises the following steps: when the signal detection unit recognizes the generation of a new erase signal, the processing unit overwrites the new erase signal and cancels the original erase signal, and the processing unit executes an erase command in a mode of the new erase signal.
The invention has the beneficial effects that: compared with the prior art, the handwriting erasing method and the handwriting erasing system of the handwriting board provided by the invention are applied to the handwriting board combination consisting of the handwriting board and the handwriting pen provided with the erasing block, and comprise the following steps: generating coordinates for each handwriting point where the handwriting passes and storing the coordinates; acquiring and identifying an erasing signal; when the received erasing signal is a screen clearing signal, all the stored handwriting points are cleared; when the received erasing signal is an area erasing signal, judging whether a second handwriting generated after the area erasing signal is received can form a closed graph area, if so, erasing the handwriting in the closed graph area, and otherwise, re-identifying whether a new closed graph area is generated; the new local area erasing method can solve the problems that the time consumed by erasing a wiping block in a point-by-point mode is long and the screen is cleared by one key during writing, and can quickly frame and clear an area needing to be erased when a large area needs to be erased locally, so that a quick and accurate erasing effect is achieved.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of a method of the present invention;
FIG. 3 is a schematic diagram of the operation of the present invention under a clear screen signal;
FIG. 4 is a schematic diagram of the operation of the erase block of the present invention;
FIG. 5 is a diagram illustrating the operation of the area erase signal according to the present invention.
The main element symbols are as follows:
1. a handwriting board; 2. a stylus pen; 3. a screen clearing key; 4. the block is erased.
Detailed Description
In order to more clearly describe the present invention, the present invention will be further described with reference to the accompanying drawings.
In the prior art, the erasing function of the handwriting pad is only one of a one-key screen clearing mode and an erasing block repeated erasing mode, and when a slightly large-range local erasing is encountered, both modes have unreasonable points, so that a new erasing mode is urgently needed.
In order to solve the defects and shortcomings in the prior art, please refer to fig. 2, 3, 4 and 5, the present invention specifically provides a handwriting erasing method of a handwriting pad, which is applied to a combination of a handwriting pad 1 and a handwriting pen 2 provided with an erasing block 4, and comprises the following steps:
generating coordinates for each handwriting point where the handwriting passes and storing the coordinates;
acquiring and identifying an erasing signal;
when the received erasing signal is a screen clearing signal, all the stored handwriting points are cleared;
when the received erasing signal is an erasing block signal, judging whether the coordinate of an erasing point where the erasing block 4 passes is the same as any coordinate of the trace points, if so, determining to erase the handwriting at the erasing point, otherwise, not making any change;
when the received erasing signal is an area erasing signal, judging whether a second handwriting generated after the area erasing signal is received can form a closed graph area, if so, erasing the handwriting in the closed graph area, and otherwise, re-identifying whether a new closed graph area is generated; the method provided by the invention enables the handwriting board 1 to receive three erasing signals when in use, thereby realizing three erasing modes, wherein the first erasing signal is applied to the erasing mode needing one key, all the handwriting contents on the handwriting board 1 can be completely removed only by one key, but the erasing mode is irreversible, and most users need to modify when in use, so the erasing block 4 can imitate the existing erasing mode of the eraser, when the erasing block 4 signal is sent out, the erasing trace is generated by the back and forth movement of the erasing block 4 on the handwriting board 1, the overlapped part is cleared by comparing the erasing point coordinate of the erasing trace with the coordinate of the handwriting point, the erasing mode is irreversible, the erasing block 4 can finely modify the tiny modification, but the time and labor are wasted once the modification range is enlarged, therefore, when the local erasing mode receives the area erasing signal, whether the second handwriting can form the closed graph area is judged through the second handwriting formed by the handwriting pen 2 in the signal mode, and the handwriting in the closed graph area is completely cleared, so that an optional irregular local erasing mode is achieved, and the method is rapid and accurate.
In the present embodiment, mention is made of: referring to fig. 2, in the step of judging whether the second handwriting generated after receiving the area erasing signal can form the closed graphic area, if so, erasing the handwriting in the closed graphic area, otherwise, re-identifying whether a new closed graphic area is generated, and automatically clearing the generated second handwriting after the judgment is finished; the second handwriting is actually used for judging, can be solid handwriting and also can be virtual handwriting in actual application, and can be drawn through a pen point of the handwriting pen 2, the handwriting of the handwriting pen 2 does not generate new handwriting in the area erasing signal mode, but generates the second handwriting for judging and forming the closed area, and therefore the handwriting does not need to be continuously reserved after the judgment is finished and can be cleared.
In the present embodiment, mention is made of: referring to fig. 2, in the step of determining whether the second handwriting generated after the area erasure signal is received can form a closed graphic area, whether a coordinate through which each point of the second handwriting passes is an adjacent continuous coordinate position is identified, if so, it is determined that the closed graphic area can be formed, and if not, it is determined that the closed graphic area cannot be formed; when the handwriting pen 2 writes, continuous handwriting can form continuous and adjacent coordinate points on the handwriting board 1, so that whether the formed graph is closed or not can be known by judging the adjacency and the continuity among the coordinate points, the characteristic of closing is used as the characteristic of judging that a user needs to erase the area, in the actual application, a confirmation step can be additionally arranged, the user can erase after confirming the closed graph area, and the user cannot confirm if the closed graph area is not formed; the number of the formed closed patterns can be multiple, and the multiple areas are locally erased.
In a preferred embodiment, mention is made of: referring to fig. 2, in the step of identifying whether the coordinate passed by each trace point of the second handwriting is an adjacent continuous coordinate position, when the coordinate position of a non-adjacent trace point is identified, whether the coordinate position is a coordinate point in another continuous trace point capable of forming a closed graph area is judged, and if not, the handwriting formed by the trace points at the coordinate position is removed when the judgment is finished; in practical use, a local area which needs to be erased by a user may be provided with a plurality of areas, so that in an erasing mode of an area erasing signal, a plurality of closed graphs drawn by the user may be provided, and coordinate points corresponding to handwriting points of second handwriting of different closed areas are not necessarily adjacent and continuous, so that the situation that the closed graphs are judged to be in different closed areas can be avoided.
In a preferred embodiment, mention is made of: referring to fig. 2, in the step of acquiring and identifying the erase signal, when the generation of a new erase signal is identified, the new erase signal overwrites and cancels the original erase signal, and the erase command is executed in the mode of the new erase signal; the step is set to avoid the mutual influence among repeated signals, and a user can execute an instruction for overwriting and erasing the original erasing signal in order to avoid the existence of other erasing signals and generate errors when using other erasing signals; the preferred scheme is that the erasing block 4 signal and the area erasing signal can coexist and be used together, and when a user can locally clear handwriting under the area erasing signal, the practical erasing block 4 clears other tiny positions, so that more accurate erasing can be rapidly and conveniently carried out.
In order to implement the aforementioned handwriting erasing method of the handwriting board 1, the invention further provides a handwriting erasing system of the handwriting board 1, please refer to fig. 1, 3, 4 and 5, which includes the handwriting board 1 and the handwriting pen 2 provided with the erasing block 4, the handwriting board 1 includes a signal detection unit, a processing unit and a storage, a pen point of the handwriting pen 2 is provided with a first pressure sensor, the erasing block 4 is provided with a second pressure sensor, the handwriting pen 2 is further provided with a sum signal generator, when the handwriting pen 2 performs writing, the first pressure sensor triggers the signal generator to send a writing signal to the handwriting board 1, the signal detection unit of the handwriting board 1 detects the writing signal and generates coordinates of each handwriting point where the handwriting of the handwriting pen 2 passes through and stores the coordinates into the storage; the first pressure sensor can send out a sensor signal when the pen point of the stylus pen 2 writes, so that the stylus pen can be recognized as pen point writing, and the pen point is used for drawing second handwriting in a handwriting writing and area erasing signal mode; the second pressure sensor can ensure that when the erasing block 4 is used, a sensor signal is sent out and is quickly switched into an erasing block 4 signal mode for erasing;
the signal detection unit acquires and identifies an erasing signal;
a screen clearing key 3 is arranged on the handwriting board 1, when the screen clearing key 3 is triggered, the signal detection unit receives a screen clearing signal and transmits the screen clearing signal to the processing unit, and the processing unit controls the storage to clear all the stored handwriting points;
when the erasing block 4 is contacted with the handwriting board 1 and the second pressure sensor is triggered, the handwriting pen 2 transmits an erasing block 4 signal to the signal detection unit through the signal generator, the signal detection unit transmits the erasing block 4 signal to the processing unit, the processing unit judges whether an erasing point coordinate passed by the erasing block 4 is the same as any coordinate of the tracing points, if yes, the handwriting at the erasing point is determined to be erased in the storage, otherwise, no change is made;
the handwriting pen 2 is provided with an area erasing key, when the area erasing key is triggered, the handwriting pen 2 transmits an area erasing signal to the signal detection unit through the signal generator, the signal detection unit transmits the area erasing signal to the processing unit, the processing unit judges whether a second handwriting generated by the handwriting board 1 after the area erasing signal is received can form a closed graph area, if so, the processing unit erases the handwriting in the closed graph area from the storage, otherwise, the handwriting board 1 is identified again whether a new closed graph area is generated; the signal detection unit is used for receiving the three erasing signals and transmitting the erasing signals to the processing unit, and the processing unit makes corresponding erasing instructions on the corresponding erasing signals; the system provided by the invention enables the signal detection unit to receive three erasing signals to realize three erasing modes when the handwriting board 1 is used, the first erasing signal is applied to the handwriting board 1 which needs to be erased by one key, all handwriting contents on the handwriting board 1 can be completely removed by pressing the erasing key 3, but the erasing mode is irreversible, and most users need to modify in use, so the erasing block 4 can imitate the existing erasing mode of the eraser, when the erasing block 4 is sent out, the erasing trace is generated by the back and forth movement of the erasing block 4 on the handwriting board 1, the overlapped part is cleared by comparing the coordinates of the erasing point of the erasing trace with the coordinates of the handwriting point, the erasing is irreversible, the erasing block 4 can finely modify the fine modification, but the system takes time and labor once the modification range is enlarged, therefore, when local erasing is needed, the processing unit can start the local erasing mode by pressing the area erasing key of the handwriting pen 2, the signal detection unit can judge whether the second handwriting can form a closed graph area or not by sending the second handwriting to the processing unit so as to control the second handwriting formed by the handwriting pen 2 in the signal mode when receiving the area erasing signal, and the writing handwriting in the closed graph area is completely cleared so as to achieve an arbitrary and irregular local erasing mode, and the method is quick and accurate.
In the present embodiment, mention is made of: referring to fig. 1, the processing unit clears the second handwriting while performing the determination of the closed area; the second handwriting is actually used for judging, can be solid handwriting and also can be virtual handwriting in actual application, can be drawn through a pen point of the handwriting pen 2, the handwriting of the handwriting pen 2 does not generate new handwriting when the area erasing key is pressed to start the area erasing signal mode, but generates the second handwriting for judging and forming the closed area, so that the handwriting does not need to be continuously reserved after the judgment is finished, and the processing unit can clear the second handwriting.
In the present embodiment, mention is made of: referring to fig. 1, a recognition module in the processing unit specifically recognizes whether a coordinate passed by each trace point of the second handwriting is an adjacent continuous coordinate position, if so, determines that a closed graph area can be formed, and if not, determines that the closed graph area cannot be formed; when the handwriting pen 2 writes, continuous and continuous handwriting can form continuous and continuous adjacent coordinate points on the handwriting board 1 and store the coordinate points to the storage device, so that whether the formed graph is closed or not can be known by judging the adjacency and continuity between the coordinate points through the processing unit, the characteristic of closing is used as the characteristic of judging that a user needs to erase the area, in the actual application, a confirmation step can be additionally arranged, the handwriting pen 2 is provided with a confirmation key, the user presses the confirmation key to confirm and then erases the formed graph area, and if the graph area is not formed, the user does not need to confirm; the number of the formed closed figures can be multiple, and the processing unit carries out local erasing on multiple areas.
In a preferred embodiment, mention is made of: referring to fig. 1, when the recognition module recognizes a coordinate position of a trace point that is not adjacent to the other trace point, it determines whether the trace point is a coordinate point of another continuous trace point that can form a closed graph area, and if not, the processing unit controls the memory to clear the trace formed by the trace point at the coordinate position; in practical use, a local area which needs to be erased by a user may be provided with a plurality of areas, so that in an erasing mode of an area erasing signal, a plurality of closed graphs drawn by the user may be provided, and coordinate points corresponding to handwriting points of second handwriting of different closed areas are not necessarily adjacent and continuous, so that the situation that the closed graphs are judged to be in different closed areas can be avoided.
In a preferred embodiment, mention is made of: referring to fig. 1, when the signal detection unit recognizes generation of a new erase signal, the processing unit overwrites the new erase signal and cancels the original erase signal, and the processing unit executes an erase command in a mode of the new erase signal; the step is set to avoid the mutual influence among repeated signals, and the processing unit can execute an instruction for overwriting and erasing the original erasing signal in order to avoid the existence of other erasing signals and generate errors when a user uses other erasing signals; the preferred scheme is that the erasing block 4 signal and the area erasing signal can coexist and be used together, and when a user can locally clear handwriting under the area erasing signal, the practical erasing block 4 clears other tiny positions, so that more accurate erasing can be rapidly and conveniently carried out.
The invention has the advantages that:
the new local area erasing method can solve the problems of long time consumed by erasing a wiping block by one point and one-key clearing for removing the wiping block, and can quickly select and remove the area needing to be erased when a large area needs to be erased locally, so that a quick and accurate erasing effect is achieved.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (6)
1. A handwriting erasing method of a handwriting pad is applied to a handwriting pad assembly consisting of the handwriting pad and a handwriting pen provided with an erasing block, and is characterized by comprising the following steps of:
generating coordinates for each handwriting point where the handwriting passes and storing the coordinates;
acquiring and identifying an erasing signal;
when the received erasing signal is a screen clearing signal, all the stored handwriting points are cleared;
when the received erasing signal is an erasing block signal, judging whether the coordinate of an erasing point where the erasing block passes is the same as any coordinate of the trace points, if so, determining to erase the handwriting at the erasing point, otherwise, not making any change;
when the received erasing signal is an area erasing signal, judging whether a second handwriting generated after the area erasing signal is received can form a closed graph area, if so, erasing the handwriting in the closed graph area, and otherwise, re-identifying whether a new closed graph area is generated;
in the step of judging whether a second handwriting generated after receiving the area erasing signal can form a closed graph area, identifying whether the coordinate passed by each handwriting point of the second handwriting is an adjacent continuous coordinate position, if so, judging that the closed graph area can be formed, and if not, judging that the closed graph area cannot be formed;
and in the step of identifying whether the coordinate passed by each trace point of the second handwriting is an adjacent continuous coordinate position or not, judging whether the coordinate position of the non-adjacent trace point is a coordinate point in another continuous trace point capable of forming a closed graph area or not when the coordinate position of the non-adjacent trace point is identified, and if not, clearing the handwriting formed by the trace points at the coordinate positions when the judgment is finished.
2. The handwriting erasing method of the handwriting board according to claim 1, wherein in the step of judging whether the second handwriting generated after receiving the area erasing signal can form the closed graph area, if so, erasing the handwriting in the closed graph area, otherwise, re-identifying whether a new closed graph area is generated, and the generated second handwriting is automatically erased after the judgment is finished.
3. A handwriting erasure method of a handwriting pad according to claim 1, characterized in that in the step of acquiring and recognizing an erasure signal, when the generation of a new erasure signal is recognized, the new erasure signal overwrites and cancels the original erasure signal, and the erasure command is executed in the mode of the new erasure signal.
4. A handwriting erasing system of a handwriting board comprises the handwriting board and a handwriting pen provided with an erasing block, and is characterized in that the handwriting board comprises a signal detection unit, a processing unit and a storage, a pen point of the handwriting pen is provided with a first pressure sensor, the erasing block is provided with a second pressure sensor, the handwriting pen is further provided with a processor and a signal generator, when the handwriting pen performs writing, the first pressure sensor triggers the signal generator to send a writing signal to the handwriting board, and the handwriting board signal detection unit detects the writing signal and generates coordinates of each handwriting point where the handwriting of the handwriting pen passes through and stores the coordinates to the storage;
the signal detection unit acquires and identifies an erasing signal;
the handwriting board is provided with a screen clearing key, when the screen clearing key is triggered, the signal detection unit receives a screen clearing signal and transmits the screen clearing signal to the processing unit, and the processing unit controls the storage to clear all the stored handwriting points;
when the erasing block is contacted with the handwriting board and the second pressure sensor is triggered, the handwriting pen transmits an erasing block signal to the signal detection unit through the signal generator, the signal detection unit transmits the erasing block signal to the processing unit, the processing unit judges whether the coordinate of an erasing point where the erasing block passes is the same as any coordinate of the trace points, if so, the handwriting at the erasing point is determined to be erased in the storage, otherwise, no change is made;
the handwriting pen is provided with an area erasing key, when the area erasing key is triggered, the handwriting pen transmits an area erasing signal to the signal detection unit through the signal generator, the signal detection unit transmits the area erasing signal to the processing unit, the processing unit judges whether a second handwriting generated by the handwriting board after the area erasing signal is received can form a closed graph area, if so, the processing unit erases the handwriting in the closed graph area from the storage, otherwise, the handwriting board is identified again whether a new closed graph area is generated;
the recognition module in the processing unit specifically recognizes whether the coordinate passed by each trace point of the second handwriting is an adjacent continuous coordinate position, if so, the closed graph area is judged to be formed, and if not, the closed graph area is judged not to be formed;
when the recognition module recognizes the coordinate positions of the trace points which are not adjacent, whether the coordinate positions are coordinate points in another continuous trace point which can form a closed graph area is judged, and if not, the processing unit controls the storage to clear the handwriting formed by the trace points at the coordinate positions.
5. A system for handwriting erasure of a writing pad according to claim 4 wherein the processing unit clears the second handwriting while performing the determination of the enclosed area.
6. A handwriting erasure system for a writing tablet according to claim 4 characterized in that when the signal detection unit recognizes the generation of a new erasure signal, the processing unit overwrites the new erasure signal and cancels the original erasure signal, and the processing unit executes the erasure command in the mode of the new erasure signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110594980.2A CN113345384B (en) | 2021-05-28 | 2021-05-28 | Handwriting erasing method and system for handwriting board |
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| TWM517861U (en) * | 2015-10-19 | 2016-02-21 | 翰碩電子股份有限公司 | Capacitive whiteboard eraser |
| CN106909246B (en) * | 2017-01-16 | 2020-03-13 | 青岛海信电器股份有限公司 | Electronic writing and erasing method and intelligent touch television |
| CN110458920B (en) * | 2018-05-08 | 2021-09-21 | 杭州海康威视数字技术股份有限公司 | Handwriting erasing method and device |
| WO2020029125A1 (en) * | 2018-08-08 | 2020-02-13 | 深圳市柔宇科技有限公司 | Writing control method, handwriting pen, and handwriting input device |
| CN109343767A (en) * | 2018-08-31 | 2019-02-15 | 湖南新云网科技有限公司 | A kind of method for deleting of electronic whiteboard |
| CN109445676B (en) * | 2018-09-11 | 2022-05-20 | 宁波思骏科技有限公司 | Method for deleting handwritten stroke information input by user on handwriting equipment |
| CN109407954B (en) * | 2018-09-11 | 2022-02-11 | 宁波思骏科技有限公司 | Writing track erasing method and system |
| CN109634506B (en) * | 2018-11-30 | 2021-11-26 | 郑州参宿物联技术有限公司 | Writable, readable and erasable large-scale interactive electronic display system |
| CN109856868A (en) * | 2019-03-08 | 2019-06-07 | 深圳市易快来科技股份有限公司 | Liquid crystal display device, liquid crystal display device and electronic equipment |
| CN211015438U (en) * | 2019-07-02 | 2020-07-14 | 深圳市图诺科技有限公司 | Intelligent clearing control circuit and writing panel adopting same |
| CN110703527B (en) * | 2019-09-04 | 2022-11-11 | 陈华丰 | Liquid crystal display device and erasing method thereof |
| CN110912870B (en) * | 2019-10-18 | 2021-09-14 | 北京字节跳动网络技术有限公司 | Method, device, medium and electronic equipment for synchronizing data of electronic whiteboard |
| CN110928444A (en) * | 2019-10-31 | 2020-03-27 | 山东蓝贝思特教装集团股份有限公司 | Local erasing method based on touch track recognition, writing board, blackboard and drawing board |
| CN211827223U (en) * | 2020-04-10 | 2020-10-30 | 袁忐英 | Liquid crystal writing pad |
| CN111524211B (en) * | 2020-04-17 | 2024-01-23 | 杭州海康威视数字技术股份有限公司 | Handwriting erasing method, handwriting erasing device and handwriting erasing equipment |
| CN212515742U (en) * | 2020-07-28 | 2021-02-09 | 深圳中电数码显示有限公司 | Writing board capable of realizing fine erasing |
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