WO2023016493A1

WO2023016493A1 - Handwriting erasing method and apparatus, storage medium, and electronic device

Info

Publication number: WO2023016493A1
Application number: PCT/CN2022/111482
Authority: WO
Inventors: 郑少庭
Original assignee: 广州视源电子科技股份有限公司; 广州视睿电子科技有限公司
Priority date: 2021-08-11
Filing date: 2022-08-10
Publication date: 2023-02-16
Also published as: CN115705141A

Abstract

The present application discloses a handwriting erasing method and apparatus, a storage medium, and an electronic device. The method comprises: displaying, in response to a circle selection operation on a first handwriting, an erasing trajectory on a canvas following the circle selection operation; then creating a bitmap image corresponding to the canvas, and marking all pixel points in an erasing area corresponding to the erasing trajectory in the bitmap image; determining edge pixel points of the first handwriting in the bitmap image on the basis of the marked pixel points; performing handwriting erasing processing on the first handwriting in the bitmap image on the basis of the edge pixel points to obtain a second handwriting; and finally displaying the second handwriting on the canvas, thereby implementing efficient and rapid circle selection and erasing for handwritings.

Description

Handwriting erasing method, device, storage medium and electronic equipment

technical field

The present application relates to the field of touch technology, in particular, to a handwriting erasing method, device, storage medium and electronic equipment.

Background technique

The existing encircling and erasing schemes for electronic handwriting generally erase the handwriting points in the erasing area by judging whether the handwriting points are in the encircled erasing area. The erasing area can be regarded as a polygon of any shape. Judging whether the handwriting point is in the erasing area is actually judging whether a point is inside or outside the polygon. In the existing schemes, the ray method is usually used, that is, a ray is made from a point , calculate the number of intersections between it and the boundary of the polygon, if the number of intersections is odd, then the point is inside the polygon, otherwise the point is outside the polygon. If the erasing area is larger, the number of sides of the polygon will be more, and the number of handwriting points in the erasing area will also be more, and the calculation will be more time-consuming.

The existing technical solution has the problem of very time-consuming calculation in the scenario where multiple handwritings are selected in a large erasing area.

Contents of the invention

In order to solve the above problems, the embodiments of the present application provide a handwriting erasing method, device, storage medium and electronic equipment.

In the first aspect, an embodiment of the present application provides a method for erasing handwriting, which is applied to a whiteboard application of a terminal device, where the canvas of the whiteboard application includes first handwriting, and the method includes:

In response to a circle-selecting operation on the first written handwriting, displaying on the canvas an erasing track following the circle-selecting operation, the erasing track comprising the points constructed based on the handwriting points captured by the circle-selecting operation handwriting curve;

Create a bitmap image corresponding to the canvas, and mark all pixels in the erasing area corresponding to the erasing track in the bitmap image;

determining edge pixels of the first handwriting in the bitmap image based on the marked pixels;

performing handwriting erasing processing on the first handwriting based on the edge pixels in the bitmap image to obtain second handwriting;

The second handwriting is displayed on the canvas.

In the second aspect, the embodiment of the present application provides a handwriting erasing device, the handwriting erasing device comprising:

an erasing track generating module, configured to display on the canvas an erasing track following the circling operation in response to the circling operation on the first handwriting;

A pixel point marking module, configured to create a bitmap image corresponding to the canvas, mark all pixels in the erasing area corresponding to the erasing track in the bitmap image, and generate an image on the canvas for a mask covering said erased area;

An edge pixel determination module, configured to determine edge pixel points of the first handwriting in the bitmap image based on the marked pixel points;

A handwriting erasing module, configured to perform handwriting erasing processing on the first handwriting based on the edge pixels in the bitmap image to obtain second handwriting;

A handwriting display module, configured to display the second handwriting on the canvas.

In a third aspect, an embodiment of the present application provides a storage medium, where a plurality of instructions are stored in the storage medium, and the instructions are adapted to be loaded by a processor and execute the above method steps.

In a fourth aspect, an embodiment of the present application provides an electronic device, which may include: a processor and a memory; wherein, the memory stores a computer program, and the computer program is adapted to be loaded by the processor and execute the above-mentioned method step.

The beneficial effects brought by the technical solutions provided by some embodiments of the present application at least include:

In the embodiment of the present application, in response to the circle selection operation on the first handwriting, the erasing track following the circle selection operation is displayed on the canvas, and then a bitmap image corresponding to the canvas is created, and the erasure track in the bitmap image is marked All pixels in the corresponding erasing area, based on the marked pixels, determine the edge pixels of the first handwriting in the bitmap image, and perform handwriting on the first handwriting based on the edge pixels in the bitmap image Erase processing to obtain the second handwriting, and finally display the second handwriting on the canvas. This application simplifies the judgment of handwriting by creating a bitmap image corresponding to the canvas, and marking the pixels in the erased area in the bitmap image to distinguish the handwriting points in the erased area and outside the erased area The process of judging whether the point is within the erasing area improves the efficiency of handwriting erasing. At the same time, a mask for covering the erasing area is generated on the canvas before handwriting erasing is completed, so that users can see the erasing area intuitively , which improves the user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the accompanying drawings required in the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present application. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

Fig. 1 provides the schematic flow chart of a kind of handwriting erasing method for the embodiment of the present application;

Fig. 2 provides a schematic diagram of an example of handwriting for the embodiment of the present application;

Fig. 3 proposes a schematic flow chart of a handwriting erasing method for the embodiment of the present application;

Figure 4 provides an example schematic diagram of generating an erasing track for the embodiment of the present application

FIG. 5 provides an exemplary schematic diagram of setting an erasing area for an embodiment of the present application;

Fig. 6 provides an exemplary schematic diagram of determining a group of handwriting points for the embodiment of the present application;

FIG. 7 provides an exemplary schematic diagram of determining edge pixel points for an embodiment of the present application;

Fig. 8 provides an exemplary schematic diagram of redrawing handwriting for the embodiment of the present application;

Fig. 9 provides an exemplary schematic diagram of redrawing handwriting for the embodiment of the present application;

Figure 10 provides a schematic structural view of a handwriting erasing device according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of an edge pixel determination module provided in an embodiment of the present application;

Fig. 12 is a schematic structural diagram of a handwriting erasing module provided by the embodiment of the present application;

Fig. 13 is a schematic structural diagram of a handwriting erasing module provided by the embodiment of the present application;

FIG. 14 provides a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

In the following introduction, the terms "first" and "second" are only used for the purpose of description, and should not be understood as indicating or implying relative importance. The following introduction provides multiple embodiments of the present application, and different embodiments can be replaced or combined and combined, so the present application can also be considered to include all possible combinations of the same and/or different embodiments described. Thus, if one embodiment contains features A, B, C, and another embodiment contains features B, D, then the application should also be considered to include all other possible combinations containing one or more of A, B, C, D Although this embodiment may not be clearly written in the following content.

The following description provides examples, and does not limit the scope, applicability or examples set forth in the claims. Changes may be made in the function and arrangement of described elements without departing from the scope of the disclosure. Various examples may omit, substitute, or add various procedures or components as appropriate. For example, the methods described may be performed in an order different from that described, and various steps may be added, omitted, or combined. Furthermore, features described with respect to some examples may be combined into other examples.

With the rapid development of touchable terminals, online teaching, remote meetings, electronic handwriting, etc. are gradually replacing the original writing and recording methods. When users use a touchable terminal to write, some mistakes will inevitably occur, and the written handwriting needs to be erased. A simple and efficient handwriting erasing method can greatly improve the user's experience in using the terminal and improve Writing efficiency.

The present application provides a handwriting erasing method. The handwriting erasing method is applied to the whiteboard application of the terminal device. Firstly, in response to the circle selection operation on the first written handwriting, the erasing track following the circle selection operation is displayed on the canvas. Then create a bitmap image corresponding to the canvas, mark all the pixels in the erasing area corresponding to the erasing track in the bitmap image, and determine the edge pixels of the first handwriting in the bitmap image based on the marked pixels , and perform handwriting erasing processing on the first handwriting based on the edge pixels in the bitmap image to obtain the second handwriting, and finally display the second handwriting on the canvas. This application simplifies the judgment of handwriting points by creating a bitmap image corresponding to the canvas, and marking the pixels in the erased area in the bitmap image to distinguish the handwriting points in the erasing area and outside the erasing area The process of judging whether it is within the erasing area improves the efficiency of handwriting erasing, and at the same time generates a mask on the canvas to cover the erasing area before the handwriting erasing is completed, so that the user can see the erasing area intuitively. Guaranteed user experience.

The handwriting erasing method provided by the embodiment of the present application will be described in detail below with reference to FIGS. 1 to 8 .

Please refer to FIG. 1 , which provides a schematic flowchart of a handwriting erasing method according to the embodiment of the present application. As shown in Fig. 1, the handwriting erasing method may include the following steps S101-S105.

S101, in response to a circle selection operation on the first handwriting, displaying an erasing track following the circle selection operation on the canvas;

Canvas, or canvas, refers to the container used to carry content in the whiteboard application. All written handwriting, drawn graphics, tables, or inserted files in the whiteboard application are carried by the canvas. For the whiteboard application, the size of the canvas can be the same as the display window of the whiteboard application, or larger than the display window of the whiteboard application. In one embodiment, the size of the canvas is larger than the display window of the whiteboard application, and when content such as handwriting is moved in the display window of the whiteboard application, the size of the canvas can be expanded.

In the embodiment of the present application, when it is detected that the user performs a circle selection operation on the first handwriting on the display window in the whiteboard application of the terminal device, the handwriting points following the circle selection operation are captured, and based on the captured handwriting points Build an erase track curve and display it in the canvas. Here, the erasing track refers to the selection track formed during the circle selection operation, because the purpose of the circle selection operation is to select the handwriting to be erased, therefore, the selection track formed during the circle selection operation is called erasure track.

Optionally, before the user performs the circle selection operation, the whiteboard application should set a handwriting erasing instruction, and in response to the setting of the handwriting erasing instruction being completed, execute the circle selection operation on the first written handwriting. The handwriting erasing command can be set through the pre-set command button on the whiteboard application interface, or a preset designated action, or voice control.

S102, create a bitmap image corresponding to the canvas, mark all pixels in the erased area corresponding to the erased track in the bitmap image, and generate a mask for covering the erased area on the canvas;

Specifically, a bitmap image corresponding to the current display interface of the canvas is created. The bitmap image includes all objects displayed on the canvas. The objects include the first handwriting and the erasing track, and the area corresponding to the erasing track (also That is, the circled area selected by the circle selection operation) is used as the erasing area, and all pixels in the erasing area corresponding to the erasing track are marked in the bitmap image, and at the same time, a mask for covering the erasing area is generated on the canvas.

Optionally, the erasing area may be a closed area generated by end-to-end connection of erasing trajectories, and the erasing area may be a rectangle, a circle, a triangle or any irregular shape.

For example, the erasing area can start from the first handwriting point of the erasing track, end at the last handwriting point of the erasing track, and use the straight line connecting the starting point and the end point as a diagonal to generate a rectangular area. Use the rectangular area as the erasing area.

Optionally, in an achievable manner, the erasing area can start from the first handwriting point of the erasing track, end at the last handwriting point of the erasing track, take the starting point as the center, and start from The distance to the end point is the radius to generate a circular area, and the circular area is used as the erased area.

Bitmap images are composed of pixels, and each pixel is assigned a specific position and color value. Bitmap images are related to resolution, that is, an image of a certain area contains a fixed number of pixels.

S103, based on the marked pixels, determine edge pixels of the first handwriting in the bitmap image;

If there is a continuous and complete handwriting in the handwriting, a part of the handwriting is located in the erasure area, and a part is located outside the erasure area, then it is necessary to determine the part of the handwriting located in the erasure area and the part outside the erasure area The edge pixels between the handwriting, the handwriting is erased with the edge pixels as the boundary of the track to be erased.

Specifically, traverse the pixels corresponding to the second handwriting points in the first written handwriting according to the time stamp sequence, and determine the handwriting point group located at the edge of the erasing area in each pixel point, and the handwriting point group includes the second erasing track point With the second reserved handwriting point, the time stamp of the second erasing track point is adjacent to the time stamp of the second reserved handwriting point, and it is determined to be erased in the writing handwriting between the second erasing track point and the second reserved handwriting point The edge pixels of the track, the pixels corresponding to the second erasing track point are marked pixels, and the pixels corresponding to the second retained handwriting point are non-marked pixels.

The above-mentioned second handwriting point is the corresponding handwriting point in the first written handwriting in the bitmap image, the second erasing track point refers to the second handwriting point located in the erasing area in the bitmap image, and the second reserved handwriting point refers to the second handwriting point located in The second stamp outside the erased area in the bitmap image.

It should be noted that during the writing process of handwriting, since the touch panel samples the touch operation through a certain sampling frequency, it will sample multiple handwriting points on the writing path. During a continuous writing process, writing The pen (or hand) is always in contact with the touch panel. The trajectory of a continuous writing can be considered as a collection of handwriting points on the writing path. These handwriting points will have a unique coordinate on the touch panel. and timestamp marks, these handwriting points are connected in sequence according to the time stamps to generate handwriting.

Please also refer to FIG. 2 , which provides an exemplary schematic diagram of handwriting for the embodiment of the present application.

As shown in Figure 2, during the writing process, the whiteboard application samples touch operations based on the touch panel, and obtains multiple handwriting points 01 on the writing path. The handwriting 02 is obtained by sequential connection, and the handwriting 02 is displayed on the canvas. The handwriting point 01 is only illustrative, and is not displayed during the actual writing process. What the user sees is the process of generating handwriting in real time following the movement of the pen tip.

S104, after confirming that the circle selection operation is completed, perform handwriting erasing processing on the first handwriting based on edge pixels in the bitmap image, to obtain second handwriting after erasing the first handwriting;

Specifically, when the circle selection operation is performed on the touch panel, corresponding touch data will be generated, and the change of the circle selection operation can be determined according to the change of the touch data. Confirm that the end of the circle selection operation is determined by the change of the touch data. When the circle selection operation ends, that is, when the user lifts the pen or hand, the touch data will no longer change, so you can confirm the end of the circle selection operation, so as to further Subsequent erasing processing is performed based on the content circled by the circle selection operation. Specifically, in the bitmap image, the written handwriting in the erasing area in the first handwriting is erased with edge pixels as the boundary, and the second handwriting is obtained after the erased handwriting is removed from the first handwriting.

S105, displaying the second handwriting on the canvas.

Specifically, the second handwriting generated in the bitmap image is displayed on the canvas.

It can be understood that, in the process of erasing handwriting in the bitmap image, the content displayed on the canvas of the whiteboard application does not change, and the handwriting erasing process is performed on the first handwriting in the bitmap image to obtain the 2. After the handwriting is written, the second handwriting is displayed on the canvas. After the handwriting is erased, the display of the mask layer is stopped, and the relevant canvas is no longer displayed. During the actual erasing process, the visual effect of the user is to perform a circle selection operation on the first handwriting, set a mask to display the erasure area corresponding to the circle selection operation, and then the handwriting in the erasure area covered by the mask is erased. In this way, during the circle selection operation, a mask covering the erased area is generated, which can visually display the circled handwriting and provide clear prompts for the handwriting to be erased, so the user can During the process, the position of the circle selection operation is adjusted in real time, and the selected handwriting to be erased is judged in combination with the display area of the mask layer that changes in real time, so that the method can adjust the handwriting to be erased in time.

In one embodiment, the method also includes the steps of:

Adjust the display area of the mask layer according to the real-time position change of the circle selection operation. During the circle selection operation, the erasing area keeps changing with the circle selection operation, and correspondingly, the display area of the mask layer also keeps changing. When the circle selection operation ends, the corresponding erase operation is performed to erase the selected area. Writing handwriting, at this time there is no more erasing area, then stop displaying the corresponding mask.

In the embodiment of this application, by creating a bitmap image corresponding to the canvas, and marking the pixels in the erased area in the bitmap image to distinguish the handwriting points in the erased area and outside the erased area , which simplifies the judgment process of judging whether a handwriting point is located in the erasing area, improves the efficiency of handwriting erasing, and calculates the edge pixels of handwriting erasing in the handwriting erasing process, ensuring the accuracy of handwriting erasing, and at the same time Before the handwriting is erased, a mask is generated on the canvas to cover the erased area, so that the user can see the erased area intuitively, which improves the user experience.

Please refer to FIG. 3 , which is a schematic flowchart of a handwriting erasing method proposed in the embodiment of the present application. As shown in FIG. 3 , the handwriting erasing method may include the following steps S201 to S209.

S201. According to the circle selection operation, capture the erasure track signal corresponding to the circle selection operation in real time, sample the erasure track signal, and generate a plurality of continuous first handwriting points;

Specifically, the signal of the erasing track is sampled to obtain a continuous series of first handwriting points, and the first handwriting points are marked with time stamps.

In an embodiment of the present application, when drawing the erasing track, the erasing track may also be drawn by selecting an erasing control.

S202, connecting each first handwriting point to generate an erasing track;

Specifically, the erasing tracks are formed by connecting the first handwriting points according to the sequence of the time stamps of the first handwriting points.

Please refer to FIG. 4 together for steps S201 to S202 , which provides an exemplary schematic diagram of generating erasing tracks for the embodiment of the present application.

As shown in Figure 4, there is the first handwriting 02-ABC in the canvas of the whiteboard application. If you want to erase the first handwriting 02-ABC, you can select the erase control or set the handwriting erasing command in the touch The panel draws the erasing track, the touch panel captures the erasing track signal in real time, generates a series of first handwriting points 03, and connects the first handwriting points in the order of time stamps in the shown canvas to form the erasing track 04 .

S203, create a bitmap image corresponding to the canvas, determine the area within the erasing track in the bitmap image as the erasing area, and generate a mask for covering the erasing area in the canvas;

Specifically, a bitmap image one-to-one corresponding to the canvas is created, and the area within the erasing track is determined in the bitmap image as the erasing area.

Preferably, a mask for covering the erased area is generated in the canvas.

Specifically, the bitmap image is not displayed in the current display interface of the canvas, and a mask layer is generated in the canvas, and the mask layer is used to cover the erasing area, which is convenient for the user to intuitively see which part of the handwriting in the area will be erased remove.

S204, setting all pixels in the erased area in the bitmap image to a specified color;

Specifically, in the bitmap image, all pixels in the erasing area are set to a specified color, and the specified color is different from the color of the first handwriting.

Please refer to FIG. 5 together for steps S203 to S204 , which provides an exemplary schematic diagram of setting an erasing area for the embodiment of the present application.

As shown in Figure 5, in the bitmap image, the first handwriting 02-ABC and erasing track 04 are arranged, then the area in the erasing track 04 is the erasing area 05, and will be erased in the shown bitmap image All pixels in area 05 are set to gray.

S205, traversing the pixels corresponding to the second handwriting points in the first written handwriting according to the time stamp sequence, and determining the handwriting point group located at the edge of the erasing area in each pixel point, and the handwriting point group includes the second erasing of the specified color The track point and the second reserved handwriting point of a non-specified color, the time stamp of the second erasing track point is adjacent to the time stamp of the second reserved handwriting point;

Specifically, each second handwriting point in the first handwriting corresponds to a unique time stamp mark, and the pixel points corresponding to each second handwriting point are traversed in sequence according to the order of time stamps, and the pixel points corresponding to each second handwriting point are judged. color value, determine the second handwriting point whose color value is the specified color as the second erasing track point, determine the second handwriting point whose color value is not the specified color as the second reserved handwriting point, and determine the second handwriting point adjacent to the time stamp The second erasing track point and the second reserved handwriting point are a handwriting point group.

It is not difficult to understand that the color value of the second erasing track point is the specified color, and the color value of the second reserved handwriting point is not the erasing color, then the second erasing track point refers to the area located in the erased area in the bitmap image Handwriting point, the second reserved handwriting point refers to the handwriting point located outside the erasing area in the bitmap image, therefore, there is a track to be erased between the second erasing track point and the second reserved handwriting point adjacent to the time stamp edge pixels. By setting the specified color for the pixels in the erasing area in the bitmap image to distinguish the handwriting points in the erasing area and outside the erasing area, it simplifies the process of judging whether the handwriting points are located in the erasing area during handwriting erasing Compared with the judgment method in the existing scheme, the judgment process is simple and fast, and the efficiency of handwriting erasure is improved.

Please also refer to FIG. 6 , which provides an exemplary schematic diagram of determining a handwriting point group for the embodiment of the present application.

It can be understood that the data storage form of the handwriting ABC in the bitmap image in the shown bitmap image is the second handwriting point with a time stamp, as shown in Figure 6, the shown handwriting point 06 is the first handwriting For the second handwriting points of ABC, the gray area shown is the circled erasing area, and each second handwriting point is partly located in the erasing area, and partly located outside the erasing area. According to the sequence of each time stamp, traverse each shown second handwriting point, judge the color value of the pixel point corresponding to each second handwriting point, determine the second handwriting point whose color value is gray as the second erasing track point, and The second handwriting point whose color value is not gray is determined as the second reserved handwriting point, and the second erasing track point and the second reserved handwriting point adjacent to the time stamp are determined to be a handwriting point group, as shown in Figure 5, the second Script point 9 and the second scribe point 10 are two second scribe points adjacent to the time stamp, wherein the pixel color value of the second scribe point 9 is not gray, and the pixel color value of the second scribe point 10 is gray, then determine the first The second handwriting point 9 is the second reserved handwriting point, the second handwriting point 10 is the second erasing track point, and the second handwriting point 9 and the second handwriting point 10 are a handwriting point group.

S206. Determine the edge pixel points of the first handwriting based on the handwriting point group;

Specifically, a dichotomy method is used to find the dichotomous pixel points between the second erasing track point and the second retained handwriting point, and the dichotomous pixel points are used as edge pixel points in the first handwriting.

Generally, the sampling frequency of the touch panel is inversely proportional to the distance between adjacent handwriting points. The sampling frequency of the existing touch panel is very high, and the corresponding second erasing track point and the second reserved handwriting point The distance between them is very small. Therefore, the binary pixel point determined by the five-time binary method is usually close enough to the edge of the erasing area, so the binary pixel point is used as the edge pixel point of the track to be erased.

Please also refer to FIG. 7 , which provides an exemplary schematic diagram of determining edge pixel points for the embodiment of the present application.

FIG. 7 takes the second handwriting point 9 and the second handwriting point 10 shown in FIG. 6 as an example, and uses the dichotomy method to determine the edge pixels between the second handwriting point 9 and the second handwriting point 10 . As shown in Figure 7, after enlarging the distance between the second handwriting point 9 and the second handwriting point 10, it can be observed that the bitmap image is composed of pixels, and the shown second handwriting point 9 and the second handwriting point 10 are respectively Corresponding to a pixel point, use the dichotomy method to determine the bisection point 1 according to the number of pixels between the second handwriting point 9 and the second handwriting point 10, as shown in the figure, the pixel color value of the bisection point 1 is not the specified color gray, and then in Use the dichotomy method to determine the dichotomy point 2 between the bisector 1 and the second handwriting point 10, as shown in the figure, the pixel color value of the bisector 2 is the specified color gray, and then use the dichotomy method to determine between the dichotomy point 2 and the dichotomy point 1 Dichotomy point 3, as shown in the figure, the pixel color value of bisector point 3 is not the specified color gray, continue to use the dichotomy method between bisector point 3 and dichotomy point 2 to determine dichotomy point 4, because the pixel color value of dichotomy point 4 is not the specified color Gray, so finally use the dichotomy method to determine the dichotomy point 5 between the bisector 4 and the dichotomy point 2, as shown in the figure, the dichotomy point 5 is very close to the edge of the erased area, so the dichotomy point 5 is used as the second handwriting point 9 and the second handwriting point 10 edge pixels between two handwriting points. Determining the edge pixel points of the first handwriting by means of dichotomy can accurately determine the edge pixel points of the first handwriting, thereby ensuring the accuracy of handwriting erasure.

S207, erasing the first handwriting in the bitmap image;

S208. Redraw the handwriting outside the erased area in the bitmap image based on the edge pixel points and the second handwriting points in the first handwriting of a non-specified color to obtain the second handwriting.

Specifically, the edge pixel is used as the starting handwriting point or the ending handwriting point, and the starting handwriting point or the ending handwriting point is inserted into the handwriting point queue composed of handwriting points of non-specified colors in the written handwriting to generate a new handwriting point queue , according to the time stamp sequence of each handwriting point in the new handwriting point queue, connect each handwriting point.

It can be understood that if the time stamp of the second reserved handwriting point in the handwriting point group corresponding to the edge pixel is in the front, and the time stamp of the second erasing track point is behind, then the edge pixel is the termination handwriting point; If the time stamp of the second reserved handwriting point in the handwriting point group corresponding to the edge pixel is behind, and the time stamp of the second erased track point is in front, then the edge pixel is the starting handwriting point. The ending handwriting point is only connected to the previous handwriting point in the handwriting point queue, and not connected to the back handwriting point. The starting handwriting point is not connected to the front handwriting point in the handwriting point queue, but only connected to the next handwriting point. Please refer to FIG. 8 , which provides an exemplary schematic diagram of redrawing handwriting according to the embodiment of the present application.

As shown in Figure 8, there is a first handwriting 701 and an erasing area 702 in the shown bitmap image, the first handwriting 701 shown has 10 handwriting points, according to the timestamp order, the handwriting of the first handwriting 701 Each second handwriting point in the point formation is successively handwriting point 1, handwriting point 2, handwriting point 3, handwriting point 4, handwriting point 5, handwriting point 6, handwriting point 7, handwriting point 8, handwriting point 9, handwriting point 10, Written 1, Written 2, Written 5, Written 6, Written 9 and Written 10 are located outside the erasing area, and Written 3, Written 4, Written 7, and Written 8 are located in the erased area Inside, there is an edge pixel point 1 between the shown handwriting point 2 and the handwriting point 3, there is an edge pixel point 2 between the shown handwriting point 4 and the handwriting point 5, and there is an edge pixel point between the shown handwriting point 6 and the handwriting point 7 At point 3, there is an edge pixel point 4 between the handwriting point 8 and the handwriting point 9 shown. According to the above, if the time stamp mark of the second reserved handwriting point in the handwriting point group corresponding to the edge pixel point is in front, and the time stamp mark of the second erasing track point is behind, then the edge pixel point is the termination handwriting point; if the edge pixel The time stamp of the second reserved handwriting point in the handwriting point group corresponding to the point is at the back, and the time stamp of the second erasing track point is at the front, so the edge pixel point is the starting handwriting point. It is not difficult to see that the handwriting point group corresponding to edge pixel point 1 includes handwriting point 2 and handwriting point 3, wherein handwriting point 2 is the second reserved handwriting point, and handwriting point 3 is the second erasing track point, then edge pixel point 1 is As for the ending handwriting point, it can be known in the same way that the edge pixel point 2 is the starting handwriting point, the edge pixel point 3 is the ending handwriting point, and the edge pixel point 4 is the starting handwriting point. Then the starting handwriting point or the ending handwriting point is inserted into the handwriting point queue formed by the handwriting points of non-designated colors in the written handwriting, and the new handwriting point queue generated is successively handwriting point 1, handwriting point 2, edge pixel point 1 ( end stroke point), edge pixel point 2 (start stroke point), stroke point 5, stroke point 6, edge pixel point 3 (end stroke point), edge pixel point 4 (start stroke point), stroke point 9, stroke point At point 10, the handwriting points in the new handwriting point queue are sequentially connected to obtain the second handwriting 703 .

Optionally, in an achievable manner, it is also possible to erase all the first handwriting segments in the first handwriting that are located in the erasing area and intersecting with the erasing area, and then based on the edge pixels and the first handwriting segment Redraws the second stroke segment of the first stroke segment that is outside the erased area.

Please refer to FIG. 9 , which provides an exemplary schematic diagram of redrawing handwriting according to the embodiment of the present application.

As shown in Figure 9, there are first handwriting 801-123 and erasing area 802 in the shown bitmap image, among shown first writing handwriting 801-123, 1 is the handwriting intersecting with shown erasing area, 2 is The handwriting and 3 in the shown erasing area are completely outside the shown erasing area, then 1 and 2 shown in the figure are the first handwriting segment 803, and the first handwriting segment is erased before redrawing the writing handwriting, and then The second handwriting segment 804 in the first handwriting outside the erased area is redrawn based on the edge pixels and the second handwriting points in the first handwriting which are not of the designated color.

S209, displaying the second handwriting on the canvas.

The second handwriting in the bitmap image is displayed on the canvas to complete handwriting erasing.

In the embodiment of the present application, by capturing the erasing track signal in real time, a plurality of consecutive first handwriting points are generated, each first handwriting point is connected to generate an erasing track, and then a bitmap image corresponding to the canvas is created to determine the bitmap The area within the erasing track in the image is the erasing area, and a mask showing the erasing area is generated in the canvas, so that the user can see the erasing area intuitively, which improves the user experience; All pixels in the erasing area are set to the designated color, then traverse the pixels corresponding to the second handwriting points in the first handwriting according to the time stamp sequence, and determine the handwriting point group located at the edge of the erasing area in each pixel point, Based on the handwriting point group and determine the edge pixels of the first handwriting by dichotomy, the accuracy of handwriting erasure is guaranteed; finally erase the first handwriting in the bitmap image, and based on the edge pixels and the first handwriting The second handwriting point of the non-specified color in the bitmap image redraws the handwriting outside the erasing area to obtain the second handwriting, by setting the specified color for the pixels in the erasing area in the bitmap image Distinguishes the handwriting points inside and outside the erasing area, simplifies the process of judging whether the handwriting points are located in the erasing area during handwriting erasing, and improves the efficiency of handwriting erasing.

The handwriting erasing device provided by the embodiment of the present application will be described in detail below with reference to FIG. 10 . It should be noted that the handwriting erasing device in Figure 10 is used to execute the method of the embodiments shown in Figures 1 to 9 of the present application. For the convenience of description, only the parts related to the embodiments of the present application are shown. For details not disclosed, please refer to the embodiments shown in FIGS. 1 to 9 of this application.

Please refer to FIG. 10 , which provides a schematic structural diagram of a handwriting erasing device according to an embodiment of the present application. As shown in FIG. 10 , the handwriting erasing device 1 of the embodiment of the present application may include: an erasing track generating module 11 , a pixel marking module 12 , an edge pixel determining module 13 , a handwriting erasing module 14 , and a handwriting display module 15 . Specifically include:

Erasing track generating module 11, for responding to the circle selection operation to the first written handwriting, display on the canvas the erasing track following the circle selection operation;

The pixel point marking module 12 is used to create a bitmap image corresponding to the canvas, mark all pixels in the erasing area corresponding to the erasing track in the bitmap image, and generate a mask for covering the erasing area on the canvas ;

The edge pixel determination module 13 is used to determine the edge pixel points of the first handwriting in the bitmap image based on the marked pixel points;

The handwriting erasing module 14 is used to perform handwriting erasing processing on the first handwriting based on edge pixels in the bitmap image to obtain the second handwriting;

The handwriting display module 15 is configured to display the second handwriting on the canvas.

Optionally, the erasing trajectory generating module 11 is specifically used for:

Real-time capture of erasing track signals to generate multiple consecutive first handwriting points;

Connect each first handwriting point to generate an erasing track.

Optionally, the pixel point marking module 12 is specifically used for:

Determine the area within the erasing track in the bitmap image as the erasing area;

Set all pixels in the erased area of the bitmap image to the specified color;

Optionally, as shown in Figure 11, the edge pixel determination module 13 includes:

The handwriting point group determination unit 131 is used to traverse the corresponding pixel points of each second handwriting point in the first handwriting according to the time stamp sequence, and determine the handwriting point group located at the edge of the erasing area in each pixel point. The handwriting point group includes A second erasing track point of a specified color and a second reserved handwriting point of a non-specified color, the time stamp of the second erasing track point is adjacent to the time stamp of the second reserved handwriting point;

The pixel point determination unit 132 is configured to determine edge pixel points of the first handwriting based on the handwriting point group.

Optionally, the pixel point determination unit 132 is specifically used for:

The bisection pixel between the second erasing track point and the second reserved handwriting point is searched for using a bisection method, and the bisection pixel is used as an edge pixel point of the first handwriting.

Optionally, as shown in Figure 12, the handwriting erasing module 14 includes:

The first handwriting erasing unit 141 is used for erasing the first handwriting in the bitmap image;

The first handwriting drawing unit 142 is configured to redraw the handwriting outside the erased area in the bitmap image based on the edge pixel points and the second handwriting points of the first handwriting of a non-specified color to obtain the second handwriting.

Optionally, the first handwriting drawing unit 141 is specifically used for:

Use the edge pixel as the starting or ending stroke point;

Inserting the starting handwriting point or the ending handwriting point into the handwriting point queue composed of the second handwriting point of the non-specified color in the written handwriting to generate a new handwriting point queue;

According to the time stamp sequence of each handwriting point in the new handwriting point queue, the handwriting points are connected to obtain the second handwriting.

Optionally, as shown in Figure 13, the handwriting erasing module 14 includes:

The second handwriting erasing unit 143 is used for erasing all the first handwriting segments in the first handwriting within the erasing area and intersecting with the erasing area;

The second handwriting drawing unit 144 is used to redraw the second handwriting segment outside the erasing area in the first handwriting segment based on the edge pixel points and the second handwriting point of the first handwriting segment of a non-designated color, so as to obtain the second written handwriting .

Optionally, the second handwriting drawing unit 143 is specifically used for:

Use the edge pixel as the starting or ending stroke point;

Inserting the starting handwriting point or the ending handwriting point into the handwriting point queue composed of the second handwriting point of the non-specified color in the first handwriting segment to generate a new handwriting point queue;

It should be noted that, when the handwriting erasing device provided by the above-mentioned embodiments executes the handwriting erasing method, the division of the above-mentioned functional modules is used as an example for illustration. In practical applications, the above-mentioned functions can be allocated by different functions according to needs Module completion means that the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the handwriting erasing device and the handwriting erasing method embodiments provided by the above embodiments belong to the same idea, and the implementation process thereof is detailed in the method embodiments, and will not be repeated here.

The embodiment of the present application also provides a computer storage medium, the computer storage medium can store a plurality of instructions, the instructions are suitable for being loaded by the processor and executing the handwriting erasing method of the embodiment shown in the above-mentioned Figures 1 to 9, specifically For the execution process, reference may be made to the specific descriptions of the embodiments shown in FIGS. 1 to 9 , and details are not repeated here.

The present application also provides a computer program product, the computer program product stores at least one instruction, at least one instruction is loaded by the processor and executes the handwriting erasing method of the embodiment shown in the above-mentioned Figures 1 to 9, the specific execution process Reference may be made to the specific descriptions of the embodiments shown in FIGS. 1 to 9 , and details are not repeated here.

Please refer to FIG. 14 , which provides a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in FIG. 14 , the electronic device 1000 may include: at least one processor 1001, at least one memory 1002, at least one network interface 1003, at least one input and output interface 1004, at least one communication bus 1005 and at least one display unit 1006. Wherein, the processor 1001 may include one or more processing cores. The processor 1001 uses various interfaces and lines to connect various parts of the entire electronic device 1000, and executes or executes instructions, programs, code sets or instruction sets stored in the memory 1002, and calls data stored in the memory 1002 to execute Various functions and processing data of the terminal 1000. The memory 1002 can be a high-speed RAM memory, or a non-volatile memory, such as at least one disk memory. Optionally, the memory 1002 may also be at least one storage device located away from the aforementioned processor 1001 . Wherein, the network interface 1003 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The communication bus 1005 is used to realize connection communication between these components. The display unit 1006 may be a touch panel. As shown in FIG. 14 , the memory 1002 as a storage medium may include an operating system, a network communication module, an input/output interface module, and a handwriting erasing program.

In the electronic device 1000 shown in FIG. 14 , the input and output interface 1004 is mainly used to provide an input interface for the user and the access device, and obtain data input by the user and the access device.

In one embodiment.

The processor 1001 can be used to call the handwriting erasing program stored in the memory 1002, and specifically perform the following operations:

In response to a framing operation on the first handwriting, displaying on the canvas an erasing trail following the circling operation;

Create a bitmap image corresponding to the canvas, mark all pixels in the erased area corresponding to the erased track in the bitmap image, and generate a mask on the canvas to cover the erased area;

Determine edge pixels of the first handwriting in the bitmap image based on the marked pixels;

Performing handwriting erasing processing on the first handwriting based on edge pixels in the bitmap image to obtain second handwriting;

Displays the second handwriting on the canvas.

Optionally, when the processor 1001 displays an erasing track following the circle selection operation on the canvas in response to the circle selection operation on the first handwriting, specifically perform the following operations:

Connect each first handwriting point to generate an erasing track.

Optionally, when the processor 1001 marks all the pixels in the erasing area corresponding to the erasing track in the bitmap image, it specifically performs the following operations:

Set all pixels in the erased area of the bitmap image to the specified color;

Based on the marked pixels, determine the edge pixels of the first handwriting in the bitmap image, including:

Traverse the pixels corresponding to the second handwriting points in the first written handwriting according to the time stamp sequence, determine the handwriting point group located at the edge of the erasing area in each pixel point, and the handwriting point group includes the second erasing track point of the specified color and the second reserved handwriting point of a non-specified color, the time stamp of the second erasing track point is adjacent to the time stamp of the second reserved handwriting point;

Edge pixel points of the first handwriting are determined based on the handwriting point group.

Optionally, when the processor 1001 determines the edge pixel points of the first handwriting based on the handwriting point group, it specifically performs the following operations:

Optionally, when the processor 1001 performs handwriting erasing processing on the first handwriting based on the edge pixels in the bitmap image to obtain the second handwriting, specifically perform the following operations:

erasing the first handwriting in the bitmap image;

Redrawing the handwriting outside the erased area in the bitmap image based on the edge pixels and the second handwriting points of the first handwriting not of the specified color to obtain the second handwriting.

Optionally, when the processor 1001 redraws the handwriting outside the erased area based on the edge pixels and the second handwriting points of a non-specified color in the first handwriting to obtain the second handwriting, specifically perform the following operations:

Use the edge pixel as the starting or ending stroke point;

Erase all the first handwriting segments within the erasing area and intersecting with the erasing area in the first handwriting;

Redrawing the second handwriting segment outside the erasing area in the first handwriting segment based on the edge pixels and the second handwriting point of the first handwriting segment of a non-specified color to obtain a second handwriting.

Optionally, the processor 1001 redraws the second handwriting segment outside the erasing area in the first handwriting segment based on the edge pixel points and the second handwriting point of a non-designated color in the first handwriting segment to obtain the second written handwriting , specifically perform the following operations:

Use the edge pixel as the starting or ending stroke point;

Those skilled in the art can clearly understand that the technical solutions of the present application can be realized by means of software and/or hardware. "Unit" and "module" in this specification refer to software and/or hardware that can complete specific functions independently or in cooperation with other components, where the hardware can be, for example, Field Programmable Gate Array (Field-ProgrammaBLE Gate Array, FPGA) , Integrated Circuit (Integrated Circuit, IC), etc.

It should be noted that for the foregoing method embodiments, for the sake of simple description, they are expressed as a series of action combinations, but those skilled in the art should know that the present application is not limited by the described action sequence. Depending on the application, certain steps may be performed in other orders or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification belong to preferred embodiments, and the actions and modules involved are not necessarily required by this application.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are only illustrative, such as the division of units, which is only a logical function division, and there may be other division methods in actual implementation, for example, multiple units or components can be combined or integrated into Another system, or some features may be ignored, or not implemented. In another point, the mutual coupling or direct coupling or communication connection shown or discussed may be through some service interfaces, and the indirect coupling or communication connection of devices or units may be in electrical or other forms.

A unit described as a separate component may or may not be physically separated, and a component displayed as a unit may or may not be a physical unit, that is, it may be located in one place, or may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

An integrated unit may be stored in a computer-readable memory if implemented in the form of a software function unit and sold or used as an independent product. Based on this understanding, the technical solution of the present application is essentially or part of the contribution to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a memory. Several instructions are included to make an electronic device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods in the various embodiments of the present application. The aforementioned memory includes: U disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above-mentioned embodiments can be completed by entering a program to instruct related hardware. The program can be stored in a computer-readable memory, and the memory can include: flash memory disk, read-only memory (Read-Only Memory, ROM), random access device (Random Access Memory, RAM), magnetic disk or optical disk, etc.

The above are merely exemplary embodiments of the present disclosure, and should not limit the scope of the present disclosure. That is, all equivalent changes and modifications made according to the teachings of the present disclosure still fall within the scope of the present disclosure. Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any modification, use or adaptation of the present disclosure, and these modifications, uses or adaptations follow the general principles of the present disclosure and include common knowledge or conventional technical means in the technical field not described in the present disclosure . The specification and examples are to be considered exemplary only, with the scope and spirit of the present disclosure defined by the claims.

Claims

A method for erasing handwriting is characterized in that it is applied to a whiteboard application of a terminal device, and the canvas of the whiteboard application includes first handwriting, and the method includes:

In response to a circle-selecting operation on the first written handwriting, displaying on the canvas an erasing track following the circle-selecting operation, the erasing track comprising the points constructed based on the handwriting points captured by the circle-selecting operation handwriting curve;

Create a bitmap image corresponding to the canvas, and mark all pixels in the erasing area corresponding to the erasing track in the bitmap image;

determining edge pixels of the first handwriting in the bitmap image based on the marked pixels;

performing handwriting erasing processing on the first handwriting based on the edge pixels in the bitmap image to obtain second handwriting;

The second handwriting is displayed on the canvas.
The method according to claim 1, wherein in response to the circle-select operation on the first handwriting, displaying on the canvas an erasing track following the circle-select operation comprises:

According to the circle selection operation, capture the erasure track signal corresponding to the circle selection operation in real time, sample the erasure track signal, and generate a plurality of continuous first handwriting points;

Connecting each of the first handwriting points to generate an erasing track.
The method according to claim 2, wherein said connecting each of said first handwriting points to generate an erasing track is specifically:

According to the sequence of the time stamps of the first handwriting points, the first handwriting points are connected to form an erasing track.
The method according to claim 1, wherein the erasing area is a closed area generated by connecting the erasing tracks end-to-end.
The method according to claim 1, wherein the marking all pixels in the erasing area corresponding to the erasing track in the bitmap image comprises:

Determining an area within the erasing track in the bitmap image as an erasing area;

Set all pixels in the erased area in the bitmap image to a specified color;

The determining the edge pixels of the first handwriting in the bitmap image based on the marked pixels includes:

Traverse the pixel points corresponding to the second handwriting points in the first written handwriting according to the time stamp sequence, and determine the handwriting point groups located at the edge of the erasing area in each of the pixel points, and the handwriting point groups include specified A second erasing track point of a color and a second reserved handwriting point not of the specified color, the time stamp of the second erased track point is adjacent to the time stamp of the second reserved handwriting point;

Determine edge pixel points of the first handwriting based on the set of handwriting points.
The method according to claim 5, wherein said determining the edge pixel points of said first handwriting based on said handwriting point group comprises:

A dichotomy method is used to find a dichotomous pixel point between the second erasing track point and the second retained handwriting point, and the dichotomous pixel point is used as an edge pixel point of the first handwriting.
The method according to claim 1, characterized in that, the step of creating a bitmap image corresponding to the canvas and marking all pixels in the erasing area corresponding to the erasing track in the bitmap image , also includes:

A mask covering the erased area is generated on the canvas.
The method according to claim 7, characterized in that the method further comprises the steps of:

According to the real-time position change of the circle selection operation, the display area of the mask layer is adjusted.
The method according to claim 7, characterized in that, in the process of performing handwriting erasure processing on the first handwriting based on the edge pixels in the bitmap image to obtain the second handwriting, Also includes:

Stop showing the mask.
The method according to claim 1, wherein the step of erasing the first handwriting based on the edge pixels in the bitmap image to obtain the second handwriting includes:

erasing the first handwriting in the bitmap image;

Redrawing the handwriting outside the erasing area in the bitmap image based on the edge pixels and the second handwriting points in the first handwriting that are not of the specified color to obtain second handwriting.
The method according to claim 10, characterized in that, redrawing the writing outside the erased area based on the edge pixel points and the second handwriting points in the first handwriting that are not of the specified color Handwriting, to obtain second handwriting, including:

Using the edge pixel as a starting handwriting point or an ending handwriting point;

Inserting the starting handwriting point or the ending handwriting point into a handwriting point queue composed of second handwriting points other than the specified color in the written handwriting to generate a new handwriting point queue;

According to the time stamp sequence of each handwriting point in the new handwriting point queue, the handwriting points are connected to obtain the second handwriting.
The method according to claim 1, wherein the step of erasing the first handwriting based on the edge pixels in the bitmap image to obtain the second handwriting includes:

erasing all the first handwriting segments within the erasing area and intersecting with the erasing area in the first handwriting;

Redrawing a second handwriting segment in the first handwriting segment outside the erasing area based on the edge pixels and the second handwriting points in the first handwriting segment that are not of the specified color to obtain a second writing handwriting.
The method according to claim 12, characterized in that, redrawing the first handwriting segment located in the first handwriting segment based on the edge pixel points and the second handwriting points of the first handwriting segment that are not of the specified color The second handwriting segment outside the erasing area is obtained to obtain the second handwriting, including:

Using the edge pixel as a starting handwriting point or an ending handwriting point;

Inserting the starting handwriting point or the ending handwriting point into a handwriting point queue composed of second handwriting points not of the specified color in the first handwriting segment to generate a new handwriting point queue;

According to the time stamp sequence of each handwriting point in the new handwriting point queue, the handwriting points are connected to obtain the second handwriting.
A handwriting erasing device is characterized in that said device comprises:

an erasing track generating module, configured to display on the canvas an erasing track following the circling operation in response to the circling operation on the first handwriting;

A pixel marking module, configured to create a bitmap image corresponding to the canvas, and mark all pixels in the erasing area corresponding to the erasing track in the bitmap image;

An edge pixel determination module, configured to determine edge pixel points of the first handwriting in the bitmap image based on the marked pixel points;

A handwriting erasing module, configured to perform handwriting erasing processing on the first handwriting based on the edge pixels in the bitmap image to obtain second handwriting;

A handwriting display module, configured to display the second handwriting on the canvas.
A storage medium, on which a computer program is stored, wherein, when the computer program is executed by a processor, the steps of the method in any one of claims 1-13 are realized.
An electronic device, characterized by comprising: a processor and a memory; wherein, the memory stores a computer program, and the computer program is suitable for being loaded by the processor and executing any one of claims 1-13 The steps of the method.