A collaborative input method and system for electromagnetic touch digital pen

Abstract

The present invention relates to the field of electromagnetic touch control, and in particular to a collaborative input method and system for an electromagnetic touch digital pen. The present invention determines the writing task type tendency by acquiring the writing type of a writing task, selects an electromagnetic touch digital pen input mode and a touch screen receiving mode based on the writing task type tendency, acquires a number of handwriting segments in an initial writing process, calculates the average value of curvature of each handwriting segment, determines whether the electromagnetic touch digital pen input mode selection is accurate based on the comparison result of the average value of curvature of each handwriting segment and a comparison curvature threshold, acquires writing track segments of multiple consecutive time periods before a current time period, determines the number of bends in each writing track segment and the track length of each writing track segment, calculates the writing track characteristic value based on the average number of bends and the average track length of each writing track segment, and then adjusts the electromagnetic touch digital pen input mode and the touch screen receiving mode, thereby reducing writing time and improving writing efficiency.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic touch control, and in particular to a collaborative input method and system of an electromagnetic touch control digital pen. Background Art

[0002] Electromagnetic touch digital pen technology is an advanced touch technology that achieves precise touch operation through the principle of electromagnetic induction. It has high sensitivity and precision, as well as good durability. It is widely used in devices such as digital tablets, electronic whiteboards, e-readers, smart phones and tablets, especially in the creative industry and education field that require high-precision input. With the advancement of technology and the growth of market demand, electromagnetic touch digital pens and related equipment are developing towards higher pressure sensing levels, faster reading speeds and a wider range of applications.

[0003] Chinese patent publication number: CN117149676A, discloses a collaborative input method and system for an electromagnetic touch digital pen. When a user selects an input mode in a first setting box of a writing device, the number N of electromagnetic touch digital pens to be used is determined based on the selected input mode; the writing device determines whether the number N is greater than 1; if so, a connection entrance is configured based on the determined number; the connection entrance is used to connect N electromagnetic touch digital pens; the writing device records the device information of the connected electromagnetic touch digital pens; the writing device generates a second setting box; the second setting box is used to display the electromagnetic touch digital pens that have been connected and the writing device name of the electromagnetic touch digital pens; after the user clicks the confirmation button of the second setting box, the connection between the electromagnetic touch digital pen and the writing device is determined based on the angular velocity data measured by the gyroscope acceleration sensor of the electromagnetic touch digital pen.

[0004] In the prior art, electromagnetic touch digital pens are mostly used for writing and drawing, but not all electromagnetic touch digital pens have pressure sensors. Most electromagnetic touch digital pens do not have this function, which results in the need to replace the corresponding electromagnetic touch digital pen or pen tip and reconnect the electromagnetic touch digital pen or pen tip when writing different types of text or drawing during use, which increases the writing time, increases the difficulty of writing, and reduces the writing efficiency. Summary of the invention

[0005] To this end, the present invention provides a collaborative input method for an electromagnetic touch digital pen, which solves the problem that when writing different types of text or drawings during use, the corresponding electromagnetic touch digital pen or pen tip needs to be replaced and reconnected to the electromagnetic touch digital pen or pen tip, which increases the writing time, increases the writing difficulty, and reduces the writing efficiency.

[0006] To achieve the above-mentioned purpose, the present invention provides, on the one hand, a cooperative input method of an electromagnetic touch digital pen, and on the other hand, a cooperative input system of an electromagnetic touch digital pen, which comprises:

[0007] Step S1, obtaining the writing type of the writing task to determine the writing task type tendency, selecting the electromagnetic touch digital pen input mode based on the writing task type tendency, and sending a signal to the touch screen to synchronize the touch screen receiving mode selection;

[0008] Step S2, obtaining a number of handwriting segments in the initial writing process, calculating the average curvature of each handwriting segment, and determining whether the electromagnetic touch digital pen input mode is correctly selected based on the comparison result of the average curvature of each handwriting segment and the comparison curvature threshold;

[0009] Step S3, obtaining writing track segments of several consecutive time periods before the current time period, calculating the writing track characteristic value based on the average number of bends and average track length of each writing track segment, adjusting the electromagnetic touch digital pen input mode, and synchronously adjusting the touch screen receiving mode.

[0010] Furthermore, the writing types of the writing tasks include text writing type, drawing writing type and text-drawing writing type.

[0011] Furthermore, the writing task type tends to be determined based on the writing type, where:

[0012] If the writing type is only the text writing type, the writing task type tendency is determined to be the text writing tendency;

[0013] If the writing type is only the drawing writing type, the writing task type tendency is determined to be the drawing writing tendency;

[0014] If the writing type includes a text writing type and a drawing writing type, the writing task type tendency is determined to be a mixed writing tendency.

[0015] Furthermore, the electromagnetic touch digital pen input mode and the touch screen receiving mode are selected according to the writing task type, wherein:

[0016] If the writing task type tendency is text writing tendency or mixed writing tendency, select text mode;

[0017] If the writing task type tendency is drawing writing tendency, select drawing mode.

[0018] Furthermore, the process of determining whether the electromagnetic touch digital pen input mode and the touch screen receiving mode are selected correctly includes:

[0019] Determine the length of several handwriting segments and calculate the average value of curvature of each handwriting segment;

[0020] Whether the comparison average is less than the comparison curvature threshold;

[0021] If it is less than the comparison curvature threshold, it is determined that the electromagnetic touch digital pen input mode and the touch screen receiving mode are correctly selected.

[0022] Furthermore, the direction change characteristics of the electromagnetic stylus are monitored in real time.

[0023] Further, the process of adjusting the electromagnetic touch digital pen input mode and the touch screen receiving mode includes:

[0024] Acquire a predetermined number of continuous and uninterrupted writing trajectory segments before the current time period during the writing process;

[0025] Obtaining the number of bends of each writing track segment and the track length of each writing track segment;

[0026] Calculating a trajectory characteristic value based on an average number of bends in each writing trajectory segment and an average trajectory length in each writing trajectory segment;

[0027] If the trajectory characteristic value is greater than the reference trajectory characteristic value, the electromagnetic touch digital pen input mode and the touch screen receiving mode are adjusted.

[0028] Furthermore, the trajectory characteristic value is calculated according to formula (1):

[0029]

[0030] In formula (1), E represents the trajectory characteristic value, N represents the average number of bends, N0 represents the preset average number of bends standard threshold, L represents the average trajectory length, and L0 represents the average trajectory length standard threshold.

[0031] Furthermore, the method further includes step S4, monitoring in real time whether the electromagnetic touch digital pen is connected to the touch screen, and automatically disconnecting the electromagnetic touch digital pen if it does not move for a predetermined time.

[0032] Furthermore, a system for cooperative input method using electromagnetic touch digital pen is characterized by comprising:

[0033] A collection and analysis module, which is used to obtain the writing type of the writing task to determine the writing task type tendency, select the electromagnetic touch digital pen input mode based on the writing task type tendency, and send a signal to the touch screen to synchronize the selection of the touch screen receiving mode;

[0034] A comparison and determination module, which is connected to the acquisition and analysis module, is used to obtain a number of handwriting segments in the initial writing process, calculate the average value of the curvature of each handwriting segment, and determine whether the electromagnetic touch digital pen input mode is correctly selected based on the comparison result of the average value of the curvature of each handwriting segment and the comparison curvature threshold;

[0035] The mode adjustment module is connected to the acquisition and analysis module and the comparison and judgment module to obtain the writing trajectory segments of several consecutive time periods before the current time period, calculate the writing trajectory characteristic value based on the average number of bends and the average trajectory length of each writing trajectory segment, and then adjust the electromagnetic touch digital pen input mode and the touch screen receiving mode.

[0036] Compared with the prior art, the present invention obtains the writing type of the writing task to determine the writing task type tendency, selects the electromagnetic touch digital pen input mode and the touch screen receiving mode based on the writing task type tendency, obtains several handwriting segments in the initial writing process, calculates the average value of the curvature of each handwriting segment, and determines whether the electromagnetic touch digital pen input mode selection is accurate based on the comparison result of the average value of the curvature of each handwriting segment and the comparison curvature threshold, obtains the writing track segments of multiple consecutive time periods before the current time period, determines the number of bends in each writing track segment and the track length of each writing track segment, calculates the writing track characteristic value based on the average number of bends and the average track length of each writing track segment, and then adjusts the electromagnetic touch digital pen input mode and the touch screen receiving mode, thereby reducing the writing time, reducing the writing difficulty, and improving the writing efficiency.

[0037] In particular, the present invention selects the electromagnetic touch digital pen input mode and the touch screen receiving mode before writing. In actual situations, drawing pays more attention to the accuracy of writing, while text pays more attention to the fluency and speed of writing. Therefore, different input modes and receiving modes will make the writing handwriting achieve different effects. In order to match the writing situation of the electromagnetic touch digital pen with the actual writing situation, the present invention pre-determines the task type tendency of the writing task type to determine the electromagnetic touch digital pen input mode, and then determines the touch screen receiving mode, thereby improving the writing efficiency of the electromagnetic touch digital pen.

[0038] In particular, the present invention enhances the writing efficiency of the electromagnetic touch digital pen by performing enhanced verification on the writing process, especially for writing types with mixed writing tendencies, which require enhanced authentication to ensure the effectiveness of the electromagnetic touch digital pen input mode.

[0039] In particular, the present invention ensures the smooth progress of writing tasks by adjusting the electromagnetic touch digital pen input mode and the touch screen receiving mode during the writing process for writing tasks with mixed writing tendencies. In actual situations, text and drawings often appear at the same time, such as converting from text mode to drawing mode. At this time, complex operations need to be performed on the electromagnetic touch digitizer and the touch screen to make the drawing proceed normally, which greatly reduces the writing efficiency. To solve the above problems, the present invention calculates the writing trajectory characteristic value, predicts the writing type, and then adjusts the electromagnetic touch digital pen input mode and the touch screen receiving mode, thereby improving the writing efficiency of the electromagnetic touch digital pen. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the steps of a cooperative input method of an electromagnetic touch-controlled digital pen according to an embodiment of the invention;

[0041] Figure 2 A logic block diagram for determining the input mode selection of the electromagnetic touch digital pen and the touch screen according to an embodiment of the invention;

[0042] Figure 3 A logic block diagram for determining whether the electromagnetic touch digital pen input mode selection is correct according to an embodiment of the invention;

[0043] Figure 4 A logic block diagram of whether to adjust the input type of the electromagnetic touch digital pen according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0045] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0046] It should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] See also Figures 1 to 4 As shown, Figure 1 The schematic diagram of the steps of the cooperative input method of the electromagnetic touch digital pen according to the embodiment of the invention is as follows: Figure 2 The following is a logic block diagram for determining the input mode selection of the electromagnetic touch digital pen and the touch screen according to an embodiment of the invention. Figure 3 This is a logic block diagram of determining whether the electromagnetic touch digital pen input mode selection is correct according to an embodiment of the invention. Figure 4 A logic block diagram of whether to adjust the input type of the electromagnetic touch digital pen according to an embodiment of the invention, which includes:

[0048] Step S1, obtaining the writing type of the writing task to determine the writing task type tendency, selecting the electromagnetic touch digital pen input mode based on the writing task type tendency, and sending a signal to the touch screen to synchronously select the touch screen receiving mode;

[0049] Step S2, obtaining a number of handwriting segments during the initial writing process, calculating the average curvature of each handwriting segment, and determining whether the electromagnetic touch digital pen input mode is correctly selected based on the comparison result of the average curvature of each handwriting segment and the comparison curvature threshold;

[0050] Step S3, obtaining writing track segments of several consecutive time periods before the current time period, calculating the writing track characteristic value based on the average number of bends and average track length of each writing track segment, adjusting the electromagnetic touch digital pen input mode, and synchronously adjusting the touch screen receiving mode.

[0051] It is understandable that the electromagnetic touch digital pen is connected to the touch screen via electromagnetic signals. Although the signal is lost during the transmission process, it does not affect the selection of the touch screen receiving mode.

[0052] Specifically, there is no limitation on the method of acquiring several note segments. For example, a camera may be used to shoot and the pixels on the touch screen may be recorded. Those skilled in the art may select the acquisition method based on actual conditions. This is a prior art and will not be elaborated on.

[0053] Specifically, the writing types of writing tasks include text writing type, drawing writing type, and text-drawing writing type.

[0054] It is understandable that there is no limitation on the specific content of the text writing type, for example, it can be text, numbers, formulas, etc. There is no limitation on the specific content of the drawing writing type, for example, it can be different polygons, tables, complex images, etc. Technical personnel in this field can classify the writing types according to actual conditions, which will not be elaborated here.

[0055] Specifically, the writing task type tends to be determined based on the writing type, where

[0056] If the writing type is only the text writing type, the writing task type tendency is determined to be the text writing tendency;

[0057] If the writing type is only the drawing writing type, the writing task type tendency is determined to be the drawing writing tendency;

[0058] If the writing type includes a text writing type and a drawing writing type, the writing task type tendency is determined to be a mixed writing tendency.

[0059] It can be understood that as long as the writing type includes both text writing type and drawing writing type, regardless of the number, it is determined as a mixed writing tendency.

[0060] Specifically, the electromagnetic touch digital pen input mode and the touch screen receiving mode are selected according to the writing task type, wherein:

[0061] If the writing task type tendency is text writing tendency or mixed writing tendency, select text mode;

[0062] If the writing task type tendency is drawing writing tendency, select drawing mode.

[0063] Specifically, the process of determining whether the electromagnetic touch digital pen input mode and the touch screen receiving mode are selected accurately includes:

[0064] Determine a number of handwriting length segments and calculate the average value of curvature of each handwriting segment;

[0065] Whether the comparison average is less than the comparison curvature threshold;

[0066] If it is less than the comparison curvature threshold, it is determined that the electromagnetic touch digital pen input mode and the touch screen receiving mode are correctly selected.

[0067] Specifically, the process of calculating the average curvature of each handwriting segment includes:

[0068] Determine the midpoint of each writing length segment and calculate the curvature of each midpoint position;

[0069] Determining the curvature of each of the intermediate points as the curvature of each handwriting segment;

[0070] The curvature of each handwriting segment is summed up to calculate the average value.

[0071] Specifically, the comparison curvature threshold is selected from the interval [0.7A, 1.2A], and A is the average curvature of each handwriting segment.

[0072] Specifically, the direction change characteristics of the electromagnetic stylus are monitored in real time.

[0073] It is understandable that the writing process is a process of continuous change, and the directional change characteristics of text are obviously different from those of drawing.

[0074] The direction change characteristics of characters are mostly characterized by short distance, many bending points, and relatively dense distribution;

[0075] The directional change characteristics of the drawing are characterized by varying distances, fewer bending points, and a more dispersed distribution.

[0076] Specifically, there is no limitation on the acquisition of direction change features. For example, it can be acquired through the built-in position sensor of the electromagnetic touch digital pen, or by touching existing handwriting on the screen. Those skilled in the art can choose according to actual conditions and will not be elaborated here.

[0077] Specifically, the process of adjusting the electromagnetic touch digital pen input mode and the touch screen receiving mode includes:

[0078] Obtain the continuous and uninterrupted writing track segments of the booked quantity before the current time period during the writing process;

[0079] Obtaining the number of bends of each writing track segment and the track length of each writing track segment;

[0080] Calculating a trajectory characteristic value based on an average number of bends in each writing trajectory segment and an average trajectory length in each writing trajectory segment;

[0081] If the trajectory characteristic value is greater than the reference trajectory characteristic value, the electromagnetic touch digital pen input mode and the touch screen receiving mode are adjusted.

[0082] Specifically, the baseline trajectory eigenvalues ​​are selected in the interval [0.87, 1.16].

[0083] Specifically, the trajectory characteristic value is calculated according to formula (1):

[0084]

[0085] In formula (1), E represents the trajectory characteristic value, N represents the average number of bends, N0 represents the preset average number of bends standard threshold, L represents the average trajectory length, and L0 represents the average trajectory length standard threshold.

[0086] The preset average bending number standard threshold is obtained by pre-calculation, wherein different bending numbers can be pre-calculated and the average bending number △N can be solved, and N0=n×△N is set, where n is the bending number accuracy coefficient, 1.05<n<1.13.

[0087] The standard threshold of the average trajectory length is calculated in advance, wherein different trajectory lengths can be calculated in advance, and the standard threshold of the average trajectory length △L is solved, and L0=l×△L is set, l is the accuracy coefficient of the bending number, 1<l<1.2.

[0088] Specifically, it monitors in real time whether the electromagnetic touch digital pen is connected to the touch screen, and automatically disconnects the electromagnetic touch digital pen if it does not move for a predetermined period of time.

[0089] It can be understood that the electromagnetic touch digital pen that has not been operated for more than a predetermined time is automatically disconnected, thereby increasing the service life of the electromagnetic touch digital pen.

[0090] Specifically, the scheduled time is selected within the interval [0min, 5min].

[0091] Specifically, a system for a collaborative input method using an electromagnetic touch digital pen is characterized by comprising:

[0092] A collection and analysis module, which is used to obtain the writing type of the writing task to determine the writing task type tendency, select the electromagnetic touch digital pen input mode based on the writing task type tendency, and send a signal to the touch screen to synchronize the selection of the touch screen receiving mode;

[0093] A comparison and determination module, which is connected to the acquisition and analysis module, is used to obtain a number of handwriting segments in the initial writing process, calculate the average value of the curvature of each handwriting segment, and determine whether the electromagnetic touch digital pen input mode is correctly selected based on the comparison result of the average value of the curvature of each handwriting segment and the comparison curvature threshold;

[0094] The mode adjustment module is connected to the acquisition and analysis module and the comparison and judgment module to obtain the writing trajectory segments of several consecutive time periods before the current time period, calculate the writing trajectory characteristic value based on the average number of bends and the average trajectory length of each writing trajectory segment, and then adjust the electromagnetic touch digital pen input mode and the touch screen receiving mode.

[0095] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A collaborative input method for an electromagnetic touch digital pen, characterized in that: include: Step S1, obtaining the writing type of the writing task to determine the writing task type tendency, selecting the electromagnetic touch digital pen input mode based on the writing task type tendency, sending a signal to the touch screen to synchronize the touch screen receiving mode selection, and when the current input mode is the text mode, performing the judgment of step S2 and step S3; Step S2, obtaining a number of handwriting segments in the initial writing process, calculating the average curvature of each handwriting segment, and determining whether the electromagnetic touch digital pen input mode is correctly selected based on the comparison result of the average curvature of each handwriting segment and the comparison curvature threshold; Step S3, obtaining writing track segments of several consecutive time periods before the current time period, calculating the writing track characteristic value based on the average number of bends and the average track length of each writing track segment, adjusting the electromagnetic touch digital pen input mode, and synchronously adjusting the touch screen receiving mode; In step S2, the process of determining whether the electromagnetic touch digital pen input mode and the touch screen receiving mode are selected correctly includes: Determine the length of several handwriting segments and calculate the average value of curvature of each handwriting segment; Whether the comparison average is less than the comparison curvature threshold; If it is less than the comparison curvature threshold, it is determined that the electromagnetic touch digital pen input mode and the touch screen receiving mode are correctly selected; In step S3, the process of adjusting the electromagnetic touch digital pen input mode and the touch screen receiving mode includes: Obtaining a predetermined number of continuous and uninterrupted writing trajectory segments before the current time period during the writing process; Obtaining the number of bends of each writing track segment and the track length of each writing track segment; Calculating a trajectory characteristic value based on an average number of bends in each writing trajectory segment and an average trajectory length in each writing trajectory segment; If the trajectory characteristic value is greater than the reference trajectory characteristic value, the electromagnetic touch digital pen input mode and the touch screen receiving mode are adjusted; The trajectory characteristic value is calculated according to formula (1): In formula (1), E represents the trajectory characteristic value, N represents the average number of bends, N0 represents the preset average number of bends standard threshold, L represents the average trajectory length, and L0 represents the average trajectory length standard threshold.

2. The cooperative input method of the electromagnetic touch digital pen according to claim 1, characterized in that: In the step S1, the writing type of the writing task includes a text writing type, a drawing writing type, and a text drawing writing type.

3. The cooperative input method of the electromagnetic touch digital pen according to claim 1, characterized in that: In step S1, the writing task type tends to be determined according to the writing type, wherein: If the writing type is only the text writing type, the writing task type tendency is determined to be the text writing tendency; If the writing type is only the drawing writing type, the writing task type tendency is determined to be the drawing writing tendency; If the writing type includes a text writing type and a drawing writing type, the writing task type tendency is determined to be a mixed writing tendency.

4. The cooperative input method of the electromagnetic touch digital pen according to claim 1, characterized in that: In step S1, the electromagnetic touch digital pen input mode and the touch screen receiving mode are selected according to the writing task type, wherein: If the writing task type tendency is text writing tendency or mixed writing tendency, select text mode; If the writing task type tendency is drawing writing tendency, select drawing mode.

5. The cooperative input method of the electromagnetic touch digital pen according to claim 1, characterized in that: In the step S3, the direction change characteristics of the electromagnetic stylus are monitored in real time.

6. The cooperative input method of the electromagnetic touch digital pen according to claim 1, characterized in that: The method further includes step S4, monitoring in real time whether the electromagnetic touch digital pen is connected to the touch screen, and automatically disconnecting the electromagnetic touch digital pen if it does not move for a predetermined period of time.

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