Electromagnetic handwriting system and handwriting deleting method thereof

Abstract

The invention discloses an electromagnetic handwriting system and a handwriting deleting method thereof, and belongs to the technical field of electromagnetic handwriting systems.The electromagnetic handwriting system comprises a two-color electromagnetic induction pen, a handwriting receiving board, a central processing unit, an image preprocessing unit, a curve input unit, a region filling and deleting unit and a displayer; the two-color electromagnetic induction pen is in communication connection with the handwriting receiving board, the handwriting receiving board is in communication connection with the central processing unit, the central processing unit is in communication connection with the image preprocessing unit, the area filling and deleting unit and the displayer, and the curve input unit is in communication connection with the image preprocessing unit and the area filling and deleting unit. By means of the mode, the function of deleting the handwriting directly through the writing operation is achieved, and the writing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic handwriting systems, and in particular to an electromagnetic handwriting system and a handwriting deletion method thereof. Background Art

[0002] An electromagnetic writing board is a device that works by generating an electromagnetic field within a certain space after the wiring circuit under the writing board is powered on, and inducing the position of the pen tip with a coil. When writing on the paper above the writing board with an electromagnetic pen with ink refill, the receiving end can reproduce the original strokes. This method can realize the digitization of handwriting without changing the traditional writing habits.

[0003] Among many existing technologies, electromagnetic stylus pens with ink refills have the problem of being difficult to correct when writing errors occur.

[0004] Based on this, the present invention designs an electromagnetic handwriting system and a handwriting deletion method thereof to solve the above problems. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides an electromagnetic handwriting system and a handwriting deletion method thereof.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: An electromagnetic handwriting system, comprising a two-color electromagnetic induction pen, a handwriting receiving board, a central processing unit, an image preprocessing unit, a curve input unit, an area filling and deleting unit and a display; The two-color electromagnetic induction pen is connected to the handwriting receiving board, the handwriting receiving board is connected to the central processing unit, the central processing unit is connected to the image preprocessing unit, the area filling and deleting unit, and the display, and the curve input unit is connected to the image preprocessing unit and the area filling and deleting unit; The two-color electromagnetic induction pen is used to switch between two types of handwriting information; The handwriting information includes writing handwriting and deletion handwriting; The handwriting receiving board is used to identify the handwriting information of the two-color electromagnetic induction pen and send it to the central processing unit; The central processing unit is used to send the handwriting information to the image preprocessing unit; The image preprocessing unit is used to perform image processing on the handwriting information; The curve input unit is used to extract the outline of the handwriting information and determine whether the deleted handwriting is a closed curve or a non-closed curve; When the deleted handwriting is a non-closed curve, the curve input unit determines whether there is an intersection between the deleted handwriting and the written handwriting, and identifies the pixel of the intersection; The area filling and deleting unit is used to fill and delete the written handwriting according to the deleted handwriting; When the deleted handwriting is a closed curve, the area filling and deletion unit sets the pixels in the closed area of ​​the closed curve to the background color based on the background color filling algorithm; When the deleted handwriting is a non-closed curve, the area filling and deletion unit traverses the inputted handwriting and sets the intersecting pixels of the handwriting and the non-closed curve as the background color; The area filling and deleting unit sends the processing result to the central processing unit, and the central processing unit sends it to the display; The display is used to display the processing results.

[0007] Furthermore, the two-color electromagnetic induction pen includes a pen body, a pen core, a through port, a control module, a switch lock detection module and a switch mechanism; The through opening is opened through the outer wall of the pen body; The control module is fixedly mounted on the inner end of the pen body, and is used for communication connection with the handwriting receiving board; There are two refills, both of which are movably connected to the switching mechanism, and the switching mechanism is connected to the opening and the pen body; There are two switch lock detection modules which are symmetrically mounted on the outer wall of the pen body, and the switch lock detection modules cooperate with the switch mechanism for positioning; The switching lock detection module is electrically connected to the control module.

[0008] Furthermore, the two refills are a black ink refill and a red ink refill respectively.

[0009] Furthermore, the switching lock detection module includes a protrusion, a sliding hole 1, a contact switch, a spring 1 and a lock pin; The protrusion is fixedly mounted on the outer wall of the pen body; The sliding hole 1 is opened at the bottom of the protrusion, the contact switch is fixedly installed on the inner top of the sliding hole 1, the pressing end of the contact switch is used in cooperation with the top of the lock pin, and the two ends of the spring 1 are respectively fixedly connected with the inner top of the sliding hole 1 and the top of the lock pin; The contact switch is electrically connected to the control module; The lower end of the lock pin cooperates with the switching mechanism for locking.

[0010] Furthermore, the lower end surface of the locking pin is an arc surface.

[0011] Furthermore, the switching mechanism includes a switching block, a switching column and a second spring; The switching block is limitedly slidably connected with the through port, and there are two positioning holes symmetrically opened on the upper end surface of the switching block; The positioning hole is plugged in with the lower end of the lock pin, and the lower end of the lock pin is slidably matched with the upper end surface of the switching block; There are two sliding holes 2 and they are symmetrically arranged on the upper and lower end surfaces of the switching block. There are two switching columns, which are respectively connected to the two sliding holes in a limited sliding manner. The lower end surface of the switching column is provided with a slot for plugging in the upper end of the pen core. There are two springs 2 and they are respectively located at the inner ends of the two sliding holes 2, and the two ends of the spring 2 are respectively fixedly connected to the inner wall of the sliding hole 2 and the lower end of the switching column.

[0012] Furthermore, the switching mechanism also includes a guide column.

[0013] Furthermore, the guide column is fixedly mounted on the inner end of the pen body, and the guide column is movably connected to the two switching columns.

[0014] Furthermore, the lower end surface of the guide column is an arc surface, and the upper end surfaces of the two switching columns are provided with domes that fit in the arc surface of the guide column for sliding connection.

[0015] In order to better achieve the purpose of the present invention, the present invention also provides an electromagnetic handwriting deletion method, comprising the following steps: Step 1, the handwriting receiving board inputs the writing handwriting and the deleting handwriting to the central processing unit; Step 2, the image preprocessing unit converts the written handwriting and the deleted handwriting into a binary image; The image preprocessing unit performs denoising on the binary image based on the median filtering algorithm; Step 3, the curve input unit determines whether the deleted handwriting is a closed curve; Step 4: If yes, the area filling and deleting unit sets the pixels in the closed area of ​​the closed curve as the background color based on the background color filling algorithm, and executes step 6; Step 5: If no, the curve input unit determines whether the non-closed curve intersects with the handwriting; If they intersect, the area filling and deleting unit traverses the intersecting pixels at the intersection of the currently input handwriting and the non-closed curve, and sets the intersecting pixels as the background color based on the background color filling algorithm, and executes step 6; If they do not intersect, proceed to step 6; Step 6: Output the results.

[0016] Compared with the prior art, the present invention has the following beneficial effects: when the present invention is used, the two-color electromagnetic induction pen is used to switch between two types of handwriting information, thereby facilitating writing, and no additional erasing tool or software clearing function is required, thereby reducing the user's operation complexity. The function of directly deleting handwriting through writing operation is realized, thereby improving writing efficiency.

[0017] Through the image preprocessing unit, curve input unit, and area filling and deletion unit, after receiving the deletion handwriting and writing handwriting, the trajectory points of the area crossed out or circled by the user are identified and deleted through an algorithm, thereby realizing the handwriting deletion function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 A square frame of an electromagnetic handwriting system of the present invention Figure 1 ; Figure 2 A square frame of an electromagnetic handwriting system of the present invention Figure 2 ; Figure 3 It is a three-dimensional diagram of the double-color electromagnetic induction pen of the present invention; Figure 4 It is a front view of the double-color electromagnetic induction pen of the present invention; Figure 5 An exploded view of the double-color electromagnetic induction pen of the present invention; Figure 6 For along Figure 4 A three-dimensional image with a portion cut away in the AA direction; Figure 7 For along Figure 4 A three-dimensional image with a portion cut away in the BB direction; Figure 8 for Figure 6 Enlarged view of point C in the middle; Fig. 9 for Figure 7 Enlarged view of point D in the middle.

[0020] The numbers in the figure represent: 1. Two-color electromagnetic induction pen; 11. Pen body; 12. Pen core; 13. Through port; 14. Control module; 15. Switch lock detection module; 151. Bump; 152. Slide hole 1; 153. Contact switch; 154. Spring 1; 155. Lock pin; 16. Switch mechanism; 161. Switch block; 162. Positioning hole; 163. Slide hole 2; 164. Switch column; 165. Spring 2; 166. Guide column; 2. Handwriting receiving board; 3. Central processing unit; 4. Image preprocessing unit; 5. Curve input unit; 6. Area filling and deletion unit; 7. Display. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0023] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1-Figure 9 , an electromagnetic handwriting system, comprising a two-color electromagnetic induction pen 1, a handwriting receiving board 2, a central processing unit 3, an image preprocessing unit 4, a curve input unit 5, an area filling and deleting unit 6 and a display 7; The two-color electromagnetic induction pen 1 is connected to the handwriting receiving board 2 in communication, the handwriting receiving board 2 is connected to the central processing unit 3 in communication, the central processing unit 3 is connected to the image preprocessing unit 4, the area filling and deleting unit 6, and the display 7 in communication, and the curve input unit 5 is connected to the image preprocessing unit 4 and the area filling and deleting unit 6 in communication; The two-color electromagnetic induction pen 1 is used to switch between two types of handwriting information; Handwriting information includes writing handwriting and deletion handwriting; The handwriting receiving board 2 is used to recognize the handwriting information of the two-color electromagnetic induction pen 1 and send it to the central processor 3; The central processing unit 3 is used to send the handwriting information to the image preprocessing unit 4; The image preprocessing unit 4 is used to perform image processing on the handwriting information; The curve input unit 5 is used for extracting the outline of the handwriting information and determining whether the deleted handwriting is a closed curve or a non-closed curve; When the deleted handwriting is a non-closed curve, the curve input unit 5 determines whether there is an intersection between the deleted handwriting and the written handwriting, and identifies the pixel of the intersection; The area filling and deleting unit 6 is used to fill and delete the written handwriting according to the deleted handwriting; When the deleted handwriting is a closed curve, the area filling and deletion unit 6 sets the pixels in the closed area of ​​the closed curve to the background color based on the background color filling algorithm; When the deleted handwriting is a non-closed curve, the area filling and deleting unit 6 traverses the inputted handwriting and sets the intersecting pixels of the handwriting and the non-closed curve as the background color; The area filling and deleting unit 6 sends the processing result to the central processor 3, and the central processor 3 sends it to the display 7; The display 7 is used to display the processing results.

[0024] When the present invention is used, the two-color electromagnetic induction pen 1 realizes the switching of two kinds of handwriting information, so as to facilitate writing, and no additional erasing tool or software clearing function is required, which reduces the operation complexity of the user. The function of directly deleting handwriting through writing operation is realized, which improves the writing efficiency.

[0025] The image preprocessing unit 4, the curve input unit 5, and the area filling and deleting unit 6 realize the handwriting deletion function by identifying and deleting the trajectory points of the area crossed out or circled by the user through an algorithm after receiving the deletion handwriting and the writing handwriting.

[0026] Embodiment 2: In some embodiments, Figure 1-Figure 9 As shown, as a preferred embodiment of the present invention, the two-color electromagnetic induction pen 1 includes a pen body 11, a pen core 12, a through port 13, a control module 14, a switch lock detection module 15 and a switch mechanism 16; The opening 13 is formed through the outer wall of the pen body 11; The control module 14 is fixedly mounted on the inner end of the pen body 11, and the control module 14 is used for communication connection with the handwriting receiving board 2; There are two refills 12 and both are movably connected to the switching mechanism 16, and the switching mechanism 16 is connected to the through port 13 and the pen body 11; There are two switch lock detection modules 15 which are symmetrically mounted on the outer wall of the pen body 11. The switch lock detection modules 15 cooperate with the switch mechanism 16 for positioning; The switching lock detection module 15 is electrically connected to the control module 14 .

[0027] The two refills 12 are respectively a black ink refill and a red ink refill.

[0028] The switch lock detection module 15 includes a protrusion 151, a sliding hole 152, a contact switch 153, a spring 154 and a lock pin 155; The protrusion 151 is fixedly mounted on the outer wall of the pen body 11; The sliding hole 152 is formed at the bottom of the protrusion 151, and the contact switch 153 is fixedly installed at the inner top of the sliding hole 152. The pressing end of the contact switch 153 cooperates with the top of the lock pin 155 for use, and the two ends of the spring 154 are respectively fixedly connected to the inner top of the sliding hole 152 and the top of the lock pin 155. The contact switch 153 is electrically connected to the control module 14; The lower end of the locking pin 155 cooperates with the switching mechanism 16 for locking.

[0029] The lower end surface of the locking pin 155 is an arc surface; The switching mechanism 16 includes a switching block 161, a positioning hole 162, a second sliding hole 163, a switching column 164, a second spring 165 and a guide column 166; The switching block 161 is connected to the through port 13 in a limited sliding manner, and there are two positioning holes 162 symmetrically arranged on the upper end surface of the switching block 161; The positioning hole 162 is plugged with the lower end of the locking pin 155, and the lower end of the locking pin 155 is slidably fitted with the upper end surface of the switching block 161; There are two second sliding holes 163 symmetrically extending through the upper and lower end surfaces of the switching block 161, and there are two switching posts 164, which are respectively connected to the second sliding holes 163 in a limited sliding manner, and the lower end surface of the switching post 164 is provided with a slot for plugging in the upper end of the pen core 12; When the present invention is used, when switching between two refills 12, by pressing the side wall of one end of the switching block 161 away from the center of the pen body 11, the switching block 161 slides along the through hole 13, and at this time, the positioning hole 162 at the other end of the switching block 161 is disengaged from the lower end of the locking pin 155, and at this time, the locking pin 155 is in conflict with the pressing end of the contact switch 153, and the pressing end of the contact switch 153 sends a conflict signal to the control module 14, and at the same time, when the positioning hole 162 at one end of the switching block 161 away from the center of the pen body 11 is plugged and locked with the other locking pin 155, the locking pin 155 is disengaged from the pressing end of the contact switch 153, and the contact switch 153 sends a disengagement signal to the control module 14; When the control module 14 receives the conflict signal and the separation signal successively, the control module 14 determines that the pen core 12 is switched successfully.

[0030] When the present invention is in use, when the switching block 161 slides in the through opening 13, the switching block 161 drives the two switching columns 164 to move, and the upper domes of the two switching columns 164 slide in contact with the lower arc surface of the guide column 166, and the pen core 12 at the concentric position with the guide column 166 moves to one side of the guide column 166, and the pen core 12 at the other side of the guide column 166 moves to the concentric position of the guide column 166. At this time, the switching column 164 slides in the second sliding hole 163 and is reset by the second spring 165, thereby realizing the switching of the two pen cores 12.

[0031] There are two springs 165 and they are respectively located at the inner ends of the two sliding holes 163. The two ends of the spring 165 are respectively fixedly connected to the inner wall of the sliding hole 163 and the lower end of the switching column 164. The guide post 166 is fixedly mounted on the inner end of the pen body 11; The lower end surface of the guide column 166 is an arc surface, and the upper end surfaces of the two switching columns 164 are provided with domes that fit the arc surface of the guide column 166 for sliding connection.

[0032] Embodiment 3: In some embodiments, Figure 1-Figure 9 As shown, as a preferred embodiment of the present invention, a method for deleting electromagnetic handwriting includes the following steps: Step 1, the handwriting receiving board 2 inputs the writing handwriting and the deleting handwriting to the central processing unit 3; Step 2, the image preprocessing unit 4 converts the written handwriting and the deleted handwriting into a binary image; The image preprocessing unit 4 performs denoising on the binary image based on a median filtering algorithm; Step 3, the curve input unit 5 determines whether the deleted handwriting is a closed curve; Step 4: If yes, the area filling and deleting unit 6 sets the pixels in the closed area of ​​the closed curve as the background color based on the background color filling algorithm, and executes step 6; Step 5: If no, the curve input unit 5 determines whether the non-closed curve intersects with the handwriting; If they intersect, the area filling and deleting unit 6 traverses the intersecting pixels at the intersection of the currently input handwriting and the non-closed curve, and sets the intersecting pixels as the background color based on the background color filling algorithm, and executes step 6; If they do not intersect, proceed to step 6; Step 6: Output the results.

[0033] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic handwriting system, characterized in that: It comprises a two-color electromagnetic induction pen (1), a handwriting receiving board (2), a central processing unit (3), an image preprocessing unit (4), a curve input unit (5), an area filling and deleting unit (6) and a display (7); The two-color electromagnetic induction pen (1) is in communication connection with the handwriting receiving board (2), the handwriting receiving board (2) is in communication connection with the central processing unit (3), the central processing unit (3) is in communication connection with the image preprocessing unit (4), the area filling and deleting unit (6), and the display (7), and the curve input unit (5) is in communication connection with the image preprocessing unit (4) and the area filling and deleting unit (6); The two-color electromagnetic induction pen (1) is used to switch between two types of handwriting information; The handwriting information includes writing handwriting and deletion handwriting; The handwriting receiving board (2) is used to identify the handwriting information of the two-color electromagnetic induction pen (1) and send it to the central processing unit (3); The central processor (3) is used to send the handwriting information to the image pre-processing unit (4); The image preprocessing unit (4) is used to perform image processing on the handwriting information; The curve input unit (5) is used to extract the contour of the handwriting information and determine whether the deleted handwriting is a closed curve or a non-closed curve; When the deleted handwriting is a non-closed curve, the curve input unit (5) determines whether there is an intersection between the deleted handwriting and the written handwriting, and identifies the pixel of the intersection; The area filling and deleting unit (6) is used to fill and delete the written handwriting according to the deleted handwriting; When the deleted handwriting is a closed curve, the area filling and deletion unit (6) sets the pixels in the closed area of ​​the closed curve to the background color based on the background color filling algorithm; When the deleted handwriting is a non-closed curve, the area filling and deletion unit (6) traverses the input handwriting and sets the intersecting pixels of the handwriting and the non-closed curve as the background color; The area filling and deleting unit (6) sends the processing result to the central processing unit (3), and the central processing unit (3) sends it to the display (7); The display (7) is used to display the processing results.

2. The electromagnetic handwriting system according to claim 1, characterized in that: The two-color electromagnetic induction pen (1) comprises a pen body (11), a pen core (12), a through port (13), a control module (14), a switch lock detection module (15) and a switch mechanism (16); The through opening (13) penetrates through the outer wall of the pen body (11); The control module (14) is fixedly mounted on the inner end of the pen body (11), and the control module (14) is used for communication connection with the handwriting receiving board (2); There are two refills (12), both of which are movably connected to the switching mechanism (16); the switching mechanism (16) is connected to the opening (13) and the pen body (11); There are two switching lock detection modules (15) which are symmetrically mounted on the outer wall of the pen body (11); the switching lock detection modules (15) cooperate with the switching mechanism (16) for positioning; The switching lock detection module (15) is electrically connected to the control module (14).

3. The electromagnetic handwriting system according to claim 2, characterized in that: The two refills (12) are respectively a black ink refill and a red ink refill.

4. The electromagnetic handwriting system according to claim 3, characterized in that: The switch lock detection module (15) comprises a protrusion (151), a sliding hole (152), a contact switch (153), a spring (154) and a lock pin (155); The protrusion (151) is fixedly mounted on the outer wall of the pen body (11); The sliding hole (152) is formed at the bottom of the protrusion (151), the contact switch (153) is fixedly mounted on the inner top of the sliding hole (152), the pressing end of the contact switch (153) is used in cooperation with the top of the locking pin (155), and the two ends of the spring (154) are respectively fixedly connected to the inner top of the sliding hole (152) and the top of the locking pin (155); The contact switch (153) is electrically connected to the control module (14); The lower end of the lock pin (155) cooperates with the switching mechanism (16) for locking.

5. The electromagnetic handwriting system according to claim 4, characterized in that: The lower end surface of the locking pin (155) is an arc surface.

6. The electromagnetic handwriting system according to claim 5, characterized in that: The switching mechanism (16) comprises a switching block (161), a switching column (164) and a second spring (165); The switching block (161) is connected to the through opening (13) in a limited sliding manner, and there are two positioning holes (162) symmetrically arranged on the upper end surface of the switching block (161); The positioning hole (162) is plugged into the lower end of the lock pin (155) for use, and the lower end of the lock pin (155) is slidably fitted with the upper end surface of the switching block (161) for use; There are two second sliding holes (163) symmetrically extending through the upper and lower end surfaces of the switching block (161); there are two switching columns (164), which are respectively connected to the second sliding holes (163) in a limited sliding manner; and a slot for plugging the upper end of the pen core (12) is provided on the lower end surface of the switching column (164); There are two springs (165) which are respectively located at the inner ends of the two sliding holes (163). The two ends of the spring (165) are respectively fixedly connected to the inner wall of the sliding hole (163) and the lower end of the switching column (164).

7. The electromagnetic handwriting system according to claim 6, characterized in that: The switching mechanism (16) further includes a guide column (166).

8. The electromagnetic handwriting system according to claim 7, characterized in that: The guide column (166) is fixedly mounted on the inner end of the pen body (11), and the guide column (166) is movably connected to the two switching columns (164).

9. The electromagnetic handwriting system according to claim 8, characterized in that: The lower end surface of the guide column (166) is an arc surface, and the upper end surfaces of the two switching columns (164) are provided with domes that fit in with the arc surface of the guide column (166) for sliding connection.

10. A method for deleting electromagnetic handwriting, using the electromagnetic handwriting system according to claim 9, characterized in that: The following steps are involved: Step 1: The handwriting receiving board (2) inputs the writing handwriting and the deletion handwriting to the central processing unit (3); Step 2, the image preprocessing unit (4) converts the written handwriting and the deleted handwriting into a binary image; The image preprocessing unit (4) performs denoising on the binary image based on a median filtering algorithm; Step 3: the curve input unit (5) determines whether the deleted handwriting is a closed curve; Step 4: If yes, the area filling and deleting unit (6) sets the pixels in the closed area of ​​the closed curve as the background color based on the background color filling algorithm, and executes step 6; Step 5: If the answer is no, the curve input unit (5) determines whether the non-closed curve intersects with the handwriting; If they intersect, the area filling and deleting unit (6) traverses the intersecting pixels at the intersection of the currently input handwriting and the non-closed curve, and sets the intersecting pixels as the background color based on the background color filling algorithm, and executes step six; If they do not intersect, proceed to step 6; Step 6: Output the results.

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