WO2020154991A1 - Handwriting processing method, electronic display device, and writing system - Google Patents

Abstract

A handwriting processing method, an electronic display device (20), and a writing system (100). The handwriting processing method is applied to the electronic display device (20), and the electronic display device (20) communicates with a writing board (12). The handwriting processing method comprises: obtaining coordinate information and writing data of a plurality of sampling points when a writing board (12) receives a writing operation; forming a writing track according to the coordinate information; and generating display handwriting according to the writing track and the writing data.

Description

Handwriting processing method, electronic display device and writing system Technical field

This application relates to the technical field of smart writing equipment, and in particular to a handwriting processing method, an electronic display device and a writing system.

Background technique

The current device that can intelligently recognize writing handwriting can embody paper writing, and can also use the device to record the user’s real handwriting in real time and transmit it to the mobile terminal, so that the writing content can be saved for the convenience of the user on the mobile terminal To view or edit.

However, the existing devices for intelligently recognizing handwriting can only restore the general shape of the handwriting, but cannot restore the relevant details of the handwriting, fail to reflect the writer's personal style, and have a poor user experience.

Summary of the invention

The embodiments of the present application provide a handwriting processing method, an electronic display device, and a writing system.

The handwriting processing method of the embodiment of the present application is applied to an electronic display device. The electronic display device communicates with a writing board. The handwriting processing method includes: acquiring coordinate information of multiple sampling points when the writing board receives a writing operation and writing Data; forming a writing track based on the coordinate information; and generating a display handwriting based on the writing track and the writing data.

The electronic display device of the embodiment of the present application communicates with the writing board. The electronic display device includes a processor. The processor is used to obtain coordinate information and writing data of a plurality of sampling points when the writing board receives a writing operation; form a writing track according to the coordinate information; generate a display handwriting based on the writing track and the writing data.

The writing system of the embodiment of the present application includes a writing pen, a writing board, and the above-mentioned electronic display device. The writing board is used to receive the writing operation of the writing pen to detect the writing track of the writing pen, and the writing track has a plurality of sampling points, and the plurality of sampling points correspond to coordinate information and writing data. The writing board communicates with the electronic display device.

The handwriting processing method, the electronic display device and the writing system of the embodiment of the application generate the displayed handwriting based on the coordinate information and the writing data and the handwriting written by the user on the paper is relatively similar, with a high degree of restoration, and can better show the writer’s Personal style is conducive to enhancing the user experience.

The additional aspects and advantages of the embodiments of the present application will be partially given in the following description, and some will become obvious from the following description, or be understood through the practice of the present application.

Description of the drawings

The above-mentioned and/or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

Fig. 1 is a schematic structural diagram of a writing system according to some embodiments of the present application.

Fig. 2 is a schematic diagram of modules of a writing system according to some embodiments of the present invention.

3 and 4 are schematic diagrams of the principle of collecting sampling points on the writing board according to some embodiments of the present invention.

FIG. 5 is a schematic diagram of a flow of collecting coordinate information of sampling points and writing data by a writing device according to some embodiments of the present invention.

6 to 15 are schematic flowcharts of handwriting processing methods according to some embodiments of the present invention.

detailed description

The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The following embodiments described with reference to the accompanying drawings are exemplary, and are only used to explain the present application, and cannot be understood as a limitation to the present application.

Please refer to FIG. 1 and FIG. 2 together. The present application provides a writing system 100. The writing system 100 includes a writing pen 11, a writing board 12 and an electronic display device 20. Wherein, the writing pen 11 and the writing board 12 jointly constitute the writing device 10, and the writing pen 11 and the writing board 12 can be used for information exchange in a wireless communication manner. The electronic display device 20 may be a mobile phone, a tablet computer, a notebook computer, a desktop computer, a smart wearable device (such as a smart watch, a smart bracelet, smart glasses, etc.), a display, and the like. The embodiment of the present application takes the electronic display device 20 as a tablet computer as an example for description. It can be understood that the specific form of the electronic display device 20 is not limited to a tablet computer. The communication module 22 of the electronic display device 20 can communicate with the communication unit 14 of the writing device 10 to realize information exchange. Specifically, the electronic display device 20 and the writing device 10 may exchange information in a wireless communication manner. Wherein, the electronic display device 20 can only communicate with the writing board 12 through wireless communication, and the communication unit 14 is provided on the writing board 12; or the electronic display device 20 can only communicate with the writing pen 11 through wireless communication. For information interaction, the communication unit 14 is set on the writing pen 11 at this time; alternatively, the electronic display device 20 may communicate with the writing pen 11 through wireless communication while performing information interaction with the writing pad 12 For information exchange, at this time, both the writing board 12 and the writing pen 11 are provided with a communication unit 14. The embodiment of the present application is described by taking the electronic display device 20 and the writing board 12 only for information interaction through wireless communication as an example. Among them, the wireless communication method can be WiFi, Bluetooth, ZigBee, and so on. The embodiment of the present application takes Bluetooth as an example for the wireless communication mode, that is, the communication module 22 and the communication unit 14 are both Bluetooth communication ports. It can be understood that the specific method of wireless communication is not limited to Bluetooth.

The writing board 12 is provided with a capacitive touch sensor. When the user holds the writing pen 11 to write on the writing board 12, a coupling capacitor is formed between the capacitive touch sensor and the writing pen 11, and the writing pen 11 is on the writing board 12. The touch position can be sensed by the writing pad 12, and the writing pad 12 samples the touch position of the writing pen 11 on the writing pad 12 multiple times in a predetermined manner to obtain coordinate information of multiple sampling points. The coordinate information of the multiple sampling points can be provided to the electronic display device 20, and the processor 21 of the electronic display device 20 can draw the writing track of the writing pen 11 based on the coordinate information of the multiple sampling points to obtain the displayed handwriting. Among them, the predetermined method includes: (1) The writing board 12 collects the touch position of the writing pen 11 on the writing board 12 every predetermined time period, such as at time 0, t ₁ , t ₂ , t ₃ ,..., t Collect the touch position of the writing pen 11 on the writing board 12 under _n (n∈N+) to obtain coordinate information of multiple sampling points, where 0, t ₁ , t ₂ , t ₃ … t _n are arithmetic series; (2) The writing board 12 collects the touch position of the writing pen 11 on the writing board 12 every predetermined distance. Specifically, when the writing board 12 just senses the touch of the writing pen 11, the writing pen 11 is on the writing board. The touch position on the writing pad 12 is the starting point. The writing pad 12 obtains the change of the touch position of the writing pen 11 on the writing pad 12 in real time, and calculates the movement of the writing pen 11 on the writing pad 12 based on the coordinate information sensed in real time. Distance, the writing board 12 records the touch position of the writing pen 11 on the writing board 12 every predetermined distance to obtain the coordinate information of multiple sampling points; (3) The writing board 12 senses the writing pen 11 on the writing board 12 in real time And record the coordinate information of the sampling point corresponding to the touch position in real time. Each time the writing board 12 collects the coordinate information of a sampling point, it will immediately send the coordinate information of the sampling point to the electronic display device 20, that is, the coordinate information of multiple sampling points is sent in time sharing. In this way, the coordinate information of each sampling point can be sent to the electronic display device 20 in real time, and the electronic display device 20 can draw the writing track of the writing pen 11 in real time to obtain the displayed handwriting, and display the displayed handwriting in real time for the user Watch.

In some embodiments, the writing pen 11 is provided with a pressure sensor. The pressure sensor is coaxially arranged with the refill of the writing pen 11. The pressure sensor is used to sense the touch pressure received by the tip of the writing pen 11 and generate pressure data when the writing pen 11 is writing. The writing pen 11 can perform the collection action synchronously with the writing board 12, that is, when the writing board 12 collects the coordinate information of the sampling point, the writing pen 11 can synchronously collect the pressure data of the sampling point. The writing pen 11 transmits the pressure data to the writing board 12 through wireless communication. The processing chip 13 of the writing board 12 packs the coordinate data of each sampling point and the pressure data of the sampling point into a data packet, and the communication unit of the writing board 12 14 Send the data packet to the electronic display device 20, and the processor 21 of the electronic display device 20 can draw and display handwriting based on the coordinate information and pressure data of multiple sampling points. Of course, in other embodiments, the pressure sensor may also be provided on the writing board 12. When the user holds the writing pen 11 to perform a writing operation on the writing board 12, the writing board 12 not only collects the touch position of the writing pen 11 on the writing board 12 to obtain coordinate information of multiple sampling points, but also senses the writing pen 11 Touch the touch pressure of the writing pad 12 at the collection time of each sampling point to obtain multiple pressure data. The communication unit 14 of the writing board 12 sends the coordinate data of each sampling point and the pressure data of the sampling point to the electronic display device 20, and the processor 21 of the electronic display device 20 can use the coordinate information and pressure data of the multiple sampling points. Draw and display handwriting.

In some embodiments, the writing board 12 also collects the collection interval time of multiple sampling points. The collection interval time refers to the difference between the collection moments of two sampling points. Among them, the two sampling points may be two sampling points that differ by a predetermined interval of several sampling points. When the number of preset intervals is 1, the two sampling points are directly adjacent (as shown in Figure 3); when the number of preset intervals is not 1, the two sampling points are indirectly adjacent to each other (as shown in Figure 4) , That is, there is at least one sampling point between these two sampling points.

Specifically, in an example, as shown in FIG. 3, counter is the first number of the sampling point, counter=0,1,2,3,...,m, m∈N. The preset number of intervals L=1, and t ₀ , t ₁ , t ₂ , t ₃ ,..., t _m are the collection moments of sampling points 0, ₁ , ₂ , ₃ ,..., _m , respectively. The collection interval time of each sampling point t _nL (n is the second number of the sampling point, the sampling point with the second number is the sampling point with the collection interval time, L is the preset number of intervals, n∈N, L ∈N+) is the difference between the acquisition time of sampling point nL and the acquisition time of sampling point (n-1)L, that is, the sampling interval time t ₁₁ of sampling point 1 is the difference between sampling point 1 and sampling point 0. The sampling interval time of sampling point 2 is t ₂₁ is the difference between sampling point 2 and sampling point 1, and the sampling interval time t ₃₁ of sampling point 3 is the difference between sampling point 3 and sampling point 2. The difference between the sampling time, and so on, the sampling interval t _n1 (n=m/L=m/1) of sampling point m is the time between sampling point m and sampling point (m-1) Difference. In particular, the sampling interval of sampling point 0 is zero.

In another example, as shown in Figure 4, counter is the first number of the sampling point, counter=0,1,2,3,...,m, m∈N. The preset number of intervals L=4, and t ₀ , t ₁ , t ₂ , t ₃ ,..., t _m are the collection moments of sampling points 0, ₁ , ₂ , ₃ ,..., _m , respectively. The collection interval time of each sampling point t _nL (n is the second number of the sampling point, the sampling point with the second number is the sampling point that collected the collection interval time, L is the preset number of intervals, n∈N, L ∈N+) is the difference between the acquisition time of sampling point nL and the acquisition time of sampling point (n-1)L, that is, the sampling interval t ₁₄ of sampling point 4 is the difference between sampling point 4 and sampling point 0. The sampling interval t ₂₄ of sampling point 8 is the difference between sampling point 8 and sampling point 4, and the sampling interval t ₃₄ of sampling point 12 is the collection of sampling point 12 and sampling point 8. The difference between the time, and so on, the sampling interval t _n4 (n=m/L=n/4) of the sampling point m is the difference between the sampling point m and the sampling point (m-4) value. In particular, the sampling interval of sampling point 0 is zero.

The specific process of collecting coordinate information of sampling points and writing data (including pressure data and collection interval time) by the description writing device 10 is exemplified below in conjunction with FIG. 4 and FIG. 5. Wherein, the preset number of intervals L=4.

After the user activates the writing device 10, the writing device 10 first opens the Bluetooth communication port. Subsequently, the writing board 12 senses the touch of the writing pen 11. When the writing pad 12 senses the touch of the writing pen 11, the writing pad 12 initializes the counter to 0, sets t=SystemcurrentTime() (t=SystemcurrentTime() is a timing program), and the writing pad 12 collects sampling points 0 The writing pen 11 collects the pressure data of the sampling point 0. At the same time, the writing board 12 calculates the value of conunter%L and judges whether the conunter%L is equal to 0. Since the value of 0%4 is 0, the writing board 12 needs to calculate the sampling interval time t ₀₄ =t ₀ -0 of the sampling point 0 =[t=SystemcurrentTime()]-0. Subsequently, the counter is incremented by 1 (counter=0+1=1), and the writing board 12 packs the coordinate information of the sampling point 0 and the writing data into a data packet, and sends it to the electronic display device 20 via Bluetooth. Subsequently, the writing board 12 determines whether the writing operation is still sensed. When the writing operation is sensed, the writing board 12 continues to collect the coordinate information of the sampling point 1, and the writing board 12 collects the pressure data of the sampling point 1. At the same time, the writing board 12 calculates the value of conunter%L and determines whether the conunter%L is equal to 0. Since the value of 1%4 is not 0, the writing board 12 does not need to calculate the sampling interval time of sampling point 1, and the counter directly adds 1 ( counter=1+1=2), and the writing board 12 packs the coordinate information of the sampling point 1 and the writing data into a data packet, and sends it to the electronic display device 20 via Bluetooth. Subsequently, the writing board 12 determines whether the writing operation is still sensed. When the writing operation is sensed, the writing board 12 continues to collect the coordinate information of the sampling point 2, and the writing board 12 collects the pressure data of the sampling point 2. At the same time, the writing board 12 calculates the value of conunter%L and determines whether the conunter%L is equal to 0. Since the value of 2%4 is not 0, the writing board 12 does not need to calculate the sampling interval time of sampling point 2, and the counter directly adds 1 ( counter=2+1=3), and the writing board 12 packs the coordinate information of the sampling point 2 and the writing data into a data packet, and sends it to the electronic display device 20 via Bluetooth. Subsequently, the writing board 12 determines whether a writing operation is still sensed. When the writing operation is sensed, the writing board 12 continues to collect the coordinate information of the sampling point 3, and the writing board 12 collects the pressure data of the sampling point 3. At the same time, the writing board 12 calculates the value of conunter%L and determines whether the conunter%L is equal to 0. Since the value of 3%4 is not 0, the writing board 12 does not need to calculate the sampling interval time of sampling point 3, and the counter directly adds 1 ( counter=3+1=4), and the writing board 12 packs the coordinate information of the sampling point 3 and the writing data into a data packet, and sends it to the electronic display device 20 via Bluetooth. Subsequently, the writing board 12 calculates the value of conunter%L and determines whether the conunter%L is equal to 0. Since the value of 4%4 is 0, the writing board 12 must calculate the sampling interval time t ₁₄ =t ₄ -t of the sampling point 4 ₀ =[t=SystemcurrentTime()]-t ₀ . Subsequently, the counter is incremented by 1 (counter=0+1=1), and the writing board 12 packs the coordinate information of the sampling point 4 and the writing data into a data packet, which is sent to the electronic display device 20 via Bluetooth. Subsequently, the writing board 12 continues to determine whether the writing operation is still sensed. By analogy, until the writing pad 12 does not sense the writing operation, the writing pad 12 determines that the user has closed the pen. When the writing pad 12 senses the writing operation of the writing pen 11 again at a certain moment, the writing pad 12 starts from the step "initialize the counter to 0, set t=SystemcurrentTime()" again to execute the coordinate information of the sampling point and the writing data Collection process.

In some embodiments, each time the communication unit 14 of the writing board 12 sends a data packet to the electronic display device 20, the communication module 22 of the electronic display device 20 will send a feedback message confirming receipt to the writing board 12. After the communication unit 14 of the writing board 12 receives the feedback information, the processing chip 13 can confirm that the electronic display device 20 has received the data packet. However, if the communication unit 14 does not receive the feedback information, the processing chip 13 will determine that the electronic display device 20 has not received the data packet. At this time, the writing board 12 waits for a predetermined period of time, and the communication unit 14 will The data packet successfully received by the electronic display device 20 is sent to the electronic display device 20 again. To ensure the accuracy of information interaction, the writing board 12 may use an idempotent confirmation and timeout retry mechanism to ensure the accuracy of information interaction. Specifically, each time the processing chip 13 sends a data packet of a sampling point, the processing chip 13 will first identify the data packet of each sampling point, for example, number the data packet of each sampling point, so that the electronic display device 20 can distinguish which sampling point the received data packet is based on the serial number. Among them, the data packet packaged by the coordinate information and written data of the same sampling point corresponds to a unique identifier, and the data packets of different sampling points correspond to different identifiers. When the writing board 12 does not receive the feedback information and needs to send the data packet to the electronic display device 20 again, the communication unit 14 sends the data packet with the logo to the electronic display device 20 again. It is understandable that when the writing board 12 has not received the feedback information sent by the electronic display device 20, the electronic display device 20 may have received the data packet, but the feedback information has not been sent or the feedback information sent is due to wireless communication. The channel quality is poor and cannot be received by the writing board 12. At this time, if the writing board 12 does not mark the data packet, the electronic display device 20 will repeatedly receive the data packet of the same sampling point, but the electronic display device 20 cannot distinguish the repeatedly received data packet and distinguish the received data packet. Whether the received data packet is the data packet of the same sampling point, the electronic display device 20 may use the repeatedly received data packet as the data packet of the next sampling point, and draw the display handwriting based on the data packet. Causes an error in the drawing of the displayed handwriting. However, after the data packet is marked, the electronic display device 20 can distinguish which sampling point the received data packet is, so that it will not cause an error in the matching of the data packet and the sampling point, and the final display handwriting will be wrong. problem.

The electronic display device 20 receives the data packet of the sampling point sent by the writing board 12, and generates a display handwriting based on the coordinate information of the sampling point in the data packet and the writing data. Specifically, please refer to FIG. 2 and FIG. 6 together. The present application also provides a handwriting processing method for the electronic display device 20 described above. The electronic display device 20 communicates with the writing board 12 described in any one of the above embodiments. Handwriting processing methods include:

S11: Obtain coordinate information and writing data of multiple sampling points when the writing board 12 receives a writing operation;

S12: Form a writing track based on coordinate information; and

S13: Generate display handwriting based on the writing track and writing data.

Please refer to FIG. 2 again, the handwriting processing method of the embodiment of the present application can be implemented by the electronic display device 20 of the embodiment of the present application. The electronic display device 20 includes a processor 21. Step S11, step S12, and step S13 can all be implemented by the processor 21. That is to say, the processor 21 can be used to obtain coordinate information and writing data of multiple sampling points when the writing pad 12 receives a writing operation, form a writing track based on the coordinate information, and generate a display handwriting based on the writing track and writing data.

As mentioned above, the coordinate information can be collected by the writing board 12. The written data includes at least one of pressure data and collection time interval. That is to say, the writing data may include only pressure data; or, the writing data may only include the collection time interval; or, the writing data may include both the pressure data and the collection time interval. When the writing data includes pressure data, the pressure data may be collected by the writing board 12 or the writing pen 11. When the writing data includes the collection time interval, the collection time interval may be collected by the writing board 12.

It is understandable that the existing method of generating handwriting when the user writes can only restore the general shape of the handwriting, that is, the general writing track of the handwriting, but cannot restore the relevant details of the handwriting, such as the thickness of the handwriting, the color depth, etc., handwriting The degree of reduction is low and cannot reflect the writer’s personal style. The handwriting processing method, the electronic display device 20, and the writing system 100 of the embodiment of the present application generate the displayed handwriting based on the coordinate information and the writing data and the handwriting written on the paper by the user, with a high degree of restoration, and can better show the writing The user’s personal style is conducive to enhancing the user’s experience.

Referring to FIG. 7, in some embodiments, the writing data includes pressure data, and step S13 generating display handwriting based on the writing track and the writing data includes:

S1311: Calculate the radius of each sampling point based on the pressure data of each sampling point; and

S1312: Display multiple sampling points on the writing track with a radius corresponding to the sampling points to generate display handwriting.

Please refer to FIG. 2 again. In some embodiments, both step S1311 and step S1312 may be implemented by the processor 21. In other words, the processor 21 can also be used to calculate the radius of each sampling point according to the pressure data of each sampling point, and to display multiple sampling points on the writing track with the radius corresponding to the sampling point to generate a display handwriting.

Specifically, every time the electronic display device 20 receives a data packet (the data packet includes coordinate information and pressure data at this time), it will cache the coordinate information and pressure data in the data packet in the memory 23, and the processor 21 can download The coordinate information and pressure data are read in the memory 23. Suppose there are sampling points 0,1,2,3,...,m,m∈N, the coordinate information of sampling point 0 is (x ₀ ,y ₀ ,z ₀ ), the pressure data is p ₀ , and the coordinate information of sampling point 1 Is (x ₁ , y ₁ , z ₁ ), the pressure data is p ₁ , the coordinate information of sampling point 2 is (x ₂ , y ₂ , z ₂ ), the pressure data is p ₂ , and so on, the sampling point m The coordinate information is (x _m , y _m , z _m ), and the pressure data is p _m . The processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20, and then according to the pressure of each sampling point The data calculates the radius of the corresponding sampling point, where the radius ρ=f(p). For example, the transformed coordinate information of sampling point 0 is (x' ₀ ,y' ₀ ,z' ₀ ), the radius is ρ ₀ , and the transformed coordinate information of sampling point 1 is (x' ₁ ,y' ₁ ,z' ₁ ), the radius is ρ ₁ , the transformed coordinate information of the sampling point 2 is (x' ₂ ,y' ₂ ,z' ₂ ), the radius is ρ ₂ , and so on, the transformed coordinate information of the sampling point m is ( _{x 'm, y' m,} z 'm), a radius of ρ _m. Subsequently, the processor 21 can draw the writing track according to the converted coordinate information of the multiple sampling points, and then adjust the thickness of each sampling point on the writing track according to the radius of each sampling point. Further, for the line between any two directly adjacent sampling points, such as the line between sampling point 1 and sampling point 2, the thickness of this part of the line can be adjusted based on the radius of sampling point 1, or sampling points can be used 2 to adjust the thickness of this part of the line, or you can first average the radii of sampling point 1 and sampling point 2, and then adjust the thickness of this part of the line based on the average. It can be understood that if the pressure of the user writing is greater, the lines of the writing track will be thicker; if the pressure of the user writing is lower, the lines of the writing track will be thinner. Therefore, the thickness of the lines of the writing track can be adjusted correspondingly according to the pressure data of multiple sampling points, so that the final displayed handwriting has a thickness change, which is more consistent with the actual writing effect of the user, and the handwriting has a higher degree of restoration.

Please refer to FIG. 8 and FIG. 9 together. In some embodiments, the writing data includes pressure data and the collection interval time. Step S13 generates a display handwriting based on the writing track and the writing data including:

S1321: Calculate the writing speed of at least one sampling point according to the collection interval time and coordinate information;

S1322: Calculate the color brightness of at least one sampling point according to the writing speed and pressure data of the at least one sampling point; and

S1323: Display multiple sampling points on the writing track with the color brightness corresponding to the sampling points to generate a display handwriting.

Wherein, step S1321 includes:

S13211: Select at least one sampling point as the current sampling point;

S13212: Calculate the distance between the current sampling point and the previous sampling point according to the coordinate information of the current sampling point and the coordinate information of the previous sampling point;

S13213: Calculate the writing speed of the current sampling point according to the distance and the collection interval time of the current sampling point.

Please refer to FIG. 2 again. In some embodiments, step S1321, step S1322, step S1323, step S13211, step S13212, and step S13213 may all be implemented by the processor 21. In other words, the processor 21 can also be used to calculate the writing speed of at least one sampling point according to the collection interval and coordinate information, calculate the color brightness of at least one sampling point according to the writing speed and pressure data of the at least one sampling point, and write Multiple sampling points on the trajectory are displayed with the color brightness corresponding to the sampling points to generate display handwriting. When the processor 21 executes step S1321, it specifically executes selecting at least one sampling point as the current sampling point, and calculating the distance between the current sampling point and the previous sampling point according to the coordinate information of the current sampling point and the coordinate information of the previous sampling point. The operation of calculating the writing speed of the current sampling point based on the distance and the collection interval time of the current sampling point.

Among them, the color brightness refers to the brightness or brightness of the color, that is, the change of the color depth and lightness. The current sampling point and the previous sampling point may be directly adjacent or indirectly adjacent. If the preset number of intervals is 1, the current sampling point is directly adjacent to the previous sampling point; if the preset number of intervals is greater than 1, the current sampling point is indirectly adjacent to the previous sampling point.

Specifically, after the writing board 12 sends the coordinate information, the pressure data, and the collection interval to the electronic display device 20, the electronic display device 20 will receive these data and cache the data in the memory 23, and the processor 21 can download the data from the memory 23. Read coordinate information, pressure data and collection interval time.

Please refer to Figure 3. In an example, suppose there are sampling points 0,1,2,3,...,m,m∈N, and the preset number of intervals L=1. At this time, each sampling point includes coordinate information, Pressure data and collection interval time. Among them, the coordinate information of sampling point 0 is (x ₀ , y ₀ , z ₀ ), the pressure data is p ₀ , the collection interval is 0, and the coordinate information of sampling point 1 is (x ₁ , y ₁ , z ₁ ), The pressure data is p ₁ , the collection interval time is t ₁₁ ; the coordinate information of sampling point 2 is (x ₂ , y ₂ , z ₂ ), the pressure data is p ₂ , and the collection interval time is t ₂₁ ; and so on, the sampling point The coordinate information of _m is (x _m , y _m , z _m ), the pressure data is p _m , and the collection interval time is t _n1 (n=m/L=m/1). The processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20, for example, the converted sample point 0 The coordinate information is (x' ₀ ,y' ₀ ,z' ₀ ), the transformed coordinate information of sampling point 1 is (x' ₁ ,y' ₁ ,z' ₁ ), and the transformed coordinate information of sampling point 2 is ( _{x '2, y' 2,} z '2), and so on, the coordinate information is converted into m sampling point _{(x' m, y 'm} , z' m). Subsequently, the processor 21 calculates the writing speed of the corresponding sampling point according to the coordinate information of each sampling point (except sampling point 0, the writing speed v _{01 of} sampling point 0 is 0 by default) and the collection interval time. Specifically, the writing speed v _{11 of} sampling point 1 can be calculated based on the coordinate information of sampling point 0 (that is, the previous sampling point), the coordinate information of sampling point 1 (that is, the current sampling point), and the sampling interval time of sampling point 1. Obtain: The processor 21 first calculates the distance between sampling point 0 and sampling point 1 according to the coordinate information of sampling point 0 and the coordinate information of sampling point 1, and then divides the distance by the sampling interval time of sampling point 1 to obtain the sampling point The writing speed of 1, namely

Similarly, the writing speed of sampling point 2

By analogy, the writing speed of sampling point m

Among them, n=m/L, n∈N. Subsequently, the processor 21 calculates the color brightness of the corresponding sampling point according to the pressure information and writing speed of each sampling point, where the color brightness π=h(p,v). For example, the color brightness of sampling point 0 is π ₀₁ , the color brightness of sampling point 1 is π ₁₁ , the color brightness of sampling point 2 is π ₂₁ , and so on, the color brightness of sampling point m is π _n1 , n=m/ L, n ∈ N. Subsequently, the processor 21 can draw the writing trajectory according to the converted coordinate information of the multiple sampling points, and then adjust the color depth of each sampling point on the writing trajectory according to the color brightness of each sampling point. Further, for the line of the writing track between any two sampling points, such as the line between sampling point 1 and sampling point 2, the color depth of this part of the line can be adjusted based on the color brightness of sampling point 1, or sampling The color brightness of point 2 is used to adjust the color depth of this part of the line, or the color brightness of sampling point 1 and sampling point 2 can be averaged, and then the color depth of this part of the line can be adjusted based on the average value. It can be understood that if the user’s writing pressure is greater and the speed is lower, the line color will be darker; if the user’s writing pressure is lower and the speed is higher, the line color will be lighter; if the user’s writing pressure is greater Larger and higher speed, or lower pressure and lower speed, the color of the line will not be too dark or light. Therefore, the color brightness of the writing track can be adjusted correspondingly according to the pressure data and writing speed of multiple sampling points, so that the color of the final display handwriting is changed in depth, which is more consistent with the actual writing effect of the user, and the reproduction of the handwriting Higher.

Please refer to Figure 4. In another example, suppose there are sampling points 0,1,2,3,...,m,m∈N, and the preset number of intervals L=4. At this time, some sampling points have coordinate information and pressure For the three types of data, data and collection interval time, some sampling points only have two types of data: coordinate information and pressure data. Among them, the coordinate information of sampling point 0 is (x ₀ , y ₀ , z ₀ ), the pressure data is p ₀ , and the collection interval time is 0; the coordinate information of sampling point 1 is (x ₁ , y ₁ , z ₁ ), The pressure data is P ₁ ; the coordinate information of sampling point 2 is (x ₂ , y ₂ , z ₂ ), and the pressure data is p ₂ ; the coordinate information of sampling point 3 is (x ₃ , y ₃ , z ₃ ), the pressure data Is p ₃ ; the coordinate information of sampling point 4 is (x ₄ , y ₄ , z ₄ ), the pressure data is p ₄ , and the collection interval is t ₁₄ ; and so on, the coordinate information of sampling point m is (x _m , y _m , z _m ), the pressure data is p _m , and the collection interval time is t _n4 (n=m/L=m/4). Then, the processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20, for example, sampling point 0 conversion after the coordinate information _{(x '0, y' 0} , z '0) coordinate information, the sampling point conversion 1 _{(x' 1, y '1} , z' 1), the coordinate information of the sampled points 2 conversion Is (x' ₂ ,y' ₂ ,z' ₂ ), the converted coordinate information of sampling point 3 is (x' ₃ ,y' ₃ ,z' ₃ ), and the converted coordinate information of sampling point 4 is (x' ₄ ,y' ₄ ,z' ₄ ), and so on, the transformed coordinate information of the sampling point m is (x' _m ,y' _m ,z' _m ). Subsequently, the processor 21 calculates the writing speed of the sampling point with the sampling interval time according to the coordinate information of multiple sampling points (except sampling point 0, the writing speed v _{04 of} sampling point 0 is 0 by default) and the sampling interval time. Specifically, the sampling writing speed v spot 4 ₁₄ according to the sampling point coordinate information (i.e. the previous sample) 0, the sampling coordinate information (i.e., the current sampling point) point 4, and the sample collection interval point 4 calculated Get: Processor 21

Similarly, the writing speed of sampling point 8

By analogy, the writing speed of sampling point m

Among them, n=m/L, n∈N. Subsequently, the processor 21 calculates the color brightness of the corresponding sampling point based on the pressure information and writing speed of each sampling point for which the writing speed is calculated, where the color brightness π=h(p,v). For example, the color brightness of sampling point 0 is π ₀₄ , the color brightness of sampling point 4 is π ₁₄ , the color brightness of sampling point 8 is π ₂₄ , and so on, the color brightness of sampling point m is π _n4 , n=m/ L. Subsequently, the processor 21 can draw the writing trajectory according to the converted coordinate information of the multiple sampling points, and then adjust the color of the multiple sampling points on the writing trajectory according to the color brightness of the multiple sampling points for which the color brightness is calculated. depth. Further, for the remaining sampling points and lines in the writing trajectory between any two sampling points for which the color brightness is calculated, for example, the remaining sampling points and lines between sampling point 0 and sampling point 4 can be based on sampling point 0 Color brightness to adjust the color depth of this part of the sampling points and lines, or use the color brightness of sampling point 4 to adjust the color depth of this part of the sampling points and lines, or you can first average the color brightness of sampling points 0 and 4 , And then adjust the color depth of this part of the sampling points and lines based on the average value. It can be understood that if the user's writing speed is high, the color of the writing track will be lighter; if the user's writing speed is low, the color of the writing track will be darker. Therefore, the color brightness of the writing track can be adjusted correspondingly according to the pressure data and writing speed of multiple sampling points, so that the color of the final display handwriting is changed in depth, which is more consistent with the actual writing effect of the user, and the reproduction of the handwriting Higher.

Referring to FIG. 10, in some embodiments, the writing data includes pressure data and the collection interval time, and step S13 generating and displaying handwriting based on the writing trajectory and the writing data includes:

S1331: Calculate the radius of each sampling point according to the pressure data of each sampling point;

S1332: Calculate the writing speed of at least one sampling point according to the collection interval time and coordinate information;

S1333: Calculate the color brightness of at least one sampling point based on the writing speed and pressure data of at least one sampling point; and

S1334: Display multiple sampling points on the writing track with the radius and color brightness corresponding to the sampling points to generate display handwriting.

Please refer to FIG. 2 again. In some embodiments, step S1331, step S1332. Both step S1333 and step S1334 can be implemented by the processor 21. In other words, the processor 21 can also be used to calculate the radius of each sampling point according to the pressure data of each sampling point, calculate the writing speed of at least one sampling point according to the sampling interval and coordinate information, and calculate the writing speed of at least one sampling point according to the pressure data of each sampling point. The writing speed and pressure data calculate the color brightness of at least one sampling point, and display multiple sampling points on the writing track with the radius and color brightness corresponding to the sampling points to generate the display handwriting.

Specifically, please refer to Figure 4 again, assuming that there are sampling points 0, 1, 2, 3,..., m, m ∈ N, and the preset number of intervals L=4. At this time, some sampling points have coordinate information, pressure data, and For these three types of data collection interval, some sampling points only have two types of data: coordinate information and pressure data. The processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20. Subsequently, the processor 21 calculates the radius of the corresponding sampling point according to the pressure data of each sampling point, where the radius ρ=f(p). Subsequently, the processor 21 calculates the writing speed of the sampling point with the sampling interval time according to the coordinate information of multiple sampling points (except sampling point 0, the writing speed v _{04 of} sampling point 0 is 0 by default) and the sampling interval time. The calculation method of the writing speed of the sampling point with the collection interval time is as described above, and will not be repeated here. Subsequently, the processor 21 calculates the color brightness of the corresponding sampling point based on the pressure information and writing speed of each sampling point for which the writing speed is calculated, where the color brightness π=h(p,v). Subsequently, the processor 21 can draw the writing trajectory according to the converted coordinate information of the multiple sampling points, and then adjust the thickness of each sampling point on the writing trajectory according to the radius of each sampling point, and calculate the color brightness according to the multiple The color brightness of the sampling points corresponding to the adjustment of the color depth of the multiple sampling points on the writing track. Further, for the line between any two directly adjacent sampling points, such as the line between sampling point 1 and sampling point 2, the thickness of this part of the line can be adjusted based on the radius of sampling point 1, or sampling points can be used 2 to adjust the thickness of this part of the line, or you can first average the radius of sampling point 1 and sampling point 2, and then adjust the thickness of this part of the line based on the average; for any two sampling points whose color brightness is calculated The remaining sampling points and lines in the writing trajectory between, for example, the remaining sampling points and lines between sampling point 0 and sampling point 4, the color depth of these sampling points and lines can be adjusted based on the color brightness of sampling point 0, Or use the color brightness of sampling point 4 to adjust the color depth of this part of the sampling points and lines, or you can first average the color brightness of sampling point 0 and sampling point 4, and then adjust the color brightness of this part of the sampling points and lines based on the average value. The shade of color. In this way, the thickness of the lines of the writing track can be adjusted according to the pressure data of multiple sampling points, and the color brightness of the writing track can be adjusted correspondingly according to the pressure data and writing speed of multiple sampling points, so that the final generated display handwriting is The thickness of the line changes, and the color of the displayed handwriting changes in depth, which is more consistent with the actual writing effect of the user, and the reduction of handwriting is higher.

Please refer to FIG. 11 and FIG. 12 together. In some embodiments, the writing data includes pressure data and the collection interval time. Step S13 generates the display handwriting based on the writing trajectory and the writing data including:

S1341: Calculate the radius of each sampling point according to the pressure data of each sampling point;

S1342: Calculate the writing acceleration of at least one sampling point according to the collection interval time and coordinate information;

S1343: Calculate the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point; and

S1344: Display multiple sampling points on the writing track with the radius corresponding to the sampling point, and display the radius of the line between the two sampling points according to the corresponding gradual change of the radius to generate the display handwriting.

Among them, step S1342 includes:

S13421: Select at least one sampling point as the current sampling point;

S13422: Calculate the writing speed of the current sampling point according to the coordinate information of the current sampling point, the collection time interval, and the coordinate information of the previous sampling point, and according to the coordinate information of the previous sampling point, the collection time interval, and the previous sampling point Calculate the writing speed of the previous sampling point with the coordinate information;

S13423: Calculate the writing acceleration of the current sampling point according to the writing speed of the current sampling point, the writing speed of the previous sampling point, and the collection time interval of the current sampling point.

Please refer to FIG. 2 again. In some embodiments, step S1341, step S1342, step S1343, step S1344, step S13421, step S13422, and step S13423 can all be implemented by the processor 21. In other words, the processor 21 can also be used to calculate the radius of each sampling point according to the pressure data of each sampling point, calculate the writing acceleration of at least one sampling point according to the sampling interval and coordinate information, and according to the writing of at least one sampling point. The acceleration calculates the gradient of the radius of the line between the sampling point and the adjacent sampling point, and displays the multiple sampling points on the writing track with the radius corresponding to the sampling point, and the line between the two sampling points The radius is displayed according to the gradient of the corresponding radius to generate display handwriting. When the processor 21 performs step S1342, the processor 21 specifically performs the following operations: select at least one sampling point as the current sampling point, and calculate the current sampling point according to the coordinate information of the current sampling point, the collection time interval, and the coordinate information of the previous sampling point. The writing speed of the sampling point, according to the coordinate information of the previous sampling point, the collection time interval, and the coordinate information of the previous sampling point, the writing speed of the previous sampling point is calculated, and the writing speed of the current sampling point, the previous sampling point The writing speed of the current sampling point and the acquisition time interval of the current sampling point are used to calculate the writing acceleration of the current sampling point.

Among them, the radius gradient can be the change in the radius of the line from large to small, when the line gradually changes from thick to thin; the radius gradient can also be the change in the radius of the line from small to large, when the line changes from thin to thick .

Specifically, please refer to Figure 4 again, assuming that there are sampling points 0, 1, 2, 3,..., m, m ∈ N, and the preset number of intervals L=4. At this time, some sampling points have coordinate information, pressure data, and For these three types of data collection interval, some sampling points only have two types of data: coordinate information and pressure data. The processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20. Subsequently, the processor 21 calculates the radius of the corresponding sampling point according to the pressure data of each sampling point, where the radius ρ=f(p). Subsequently, the processor 21 calculates the writing speed of the sampling point with the sampling interval according to the coordinate information of the multiple sampling points (except sampling point 0, the writing speed v _{04 of} sampling point 0 is 0 by default) and the sampling interval time, and then according to the The writing speed of the sampling point of the sampling interval time is calculated to calculate the writing acceleration of the sampling point of the sampling interval time. Specifically, the writing speed v _{14 of} sampling point 4 can be calculated according to the coordinate information of sampling point 0 (ie the previous sampling point), the coordinate information of sampling point 4 (ie the current sampling point), and the sampling interval time of sampling point 4. , The writing acceleration a _{14 of} sampling point 4 can be calculated according to the writing speed v ₀₄ (v ₀₄ =0) of sampling point 0, the writing speed v ₁₄ of sampling point 4, and the collection interval time of sampling point 4:

Similarly, the writing speed of sampling point 8

By analogy, the writing speed of sampling point m

n=m/L, n∈N. Subsequently, the processor 21 calculates the radius gradient of the line between the sampling point and the adjacent sampling point according to the writing acceleration of each sampling point for which the writing acceleration is calculated, where the radius gradient σ=g(a) . For example, the radius gradient of the line between sampling point 0 and sampling point 4 is σ ₁₄ , the radius gradient of the line between sampling point 4 and sampling point 8 is σ ₂₄ , and so on, sampling point n*4 is The gradient of the radius of the line between the sampling points (n-1)4 is σ _n4 . Subsequently, the processor 21 draws the writing trajectory according to the converted coordinate information of the multiple sampling points, correspondingly adjusts the thickness of each sampling point on the writing trajectory according to the radius of each sampling point, and adjusts the corresponding line according to the gradient of the multiple radii The thickness of the radius changes to generate the final display handwriting. It can be understood that if the user's writing speed gradually increases, the lines of the writing trace will gradually become thinner; if the user's writing speed gradually decreases, the lines of the writing trace will gradually become thicker. Therefore, the thickness of the line in the writing track can be adjusted according to the writing acceleration of multiple sampling points, so that the final generated line showing the handwriting (especially the position of the pen tip) has the effect of gradual thickness, which is more consistent with the actual writing effect of the user , The reduction degree of handwriting is higher.

Referring to FIG. 13, in some embodiments, in some embodiments, the writing data includes pressure data and a collection interval time, and step S13 generating display handwriting based on the writing trajectory and the writing data includes:

S1351: Calculate the writing speed of at least one sampling point according to the collection interval time and coordinate information;

S1352: Calculate the color brightness of at least one sampling point according to the writing speed and pressure data of the at least one sampling point;

S1353: Calculate the writing acceleration of at least one sampling point according to the collection interval time and coordinate information;

S1354: Calculate the color brightness gradient of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point; and

S1355: Display multiple sampling points on the writing track with the color brightness corresponding to the sampling point, and display the color brightness of the line between the two sampling points according to the corresponding color brightness gradual change to generate display handwriting.

Please refer to FIG. 2 again. In some embodiments, step S1351, step S1352, step S1353, step S1354, and step S1355 can all be implemented by the processor 21. That is to say, the processor 21 can also be used to calculate the writing speed of at least one sampling point according to the collection interval time and coordinate information, and to calculate the distance between the sampling point and the adjacent sampling point according to the writing acceleration of the at least one sampling point. The color lightness gradient of the line, the writing acceleration of at least one sampling point is calculated according to the collection interval time and coordinate information, and the color lightness of the line between the sampling point and the adjacent sampling point is calculated according to the writing acceleration of at least one sampling point Gradient and multiple sampling points on the writing track are displayed with the color lightness corresponding to the sampling point, and the color lightness of the line between the two sampling points is displayed according to the corresponding color lightness gradient change to generate the display handwriting.

Among them, the gradation of color lightness can be the change of the color of the line from dark to light; the gradation of color lightness can also be the change of the color of the line from light to dark.

Specifically, please refer to Figure 4 again, assuming that there are sampling points 0, 1, 2, 3,..., m, m ∈ N, and the preset number of intervals L=4. At this time, some sampling points have coordinate information, pressure data, and For these three types of data collection interval, some sampling points only have two types of data: coordinate information and pressure data. The processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20. Subsequently, the processor 21 calculates the writing speed and writing acceleration of the sampling points with the sampling interval based on the coordinate information and the sampling interval time of multiple sampling points (except sampling point 0, the velocity v _{04 of} sampling point 0 is 0 by default). The calculation method of the writing speed and the writing acceleration of the sampling points with the collection interval time is as described above, and will not be repeated here. Subsequently, the processor 21 calculates the color brightness of the corresponding sampling point based on the pressure information and writing speed of each sampling point for which the writing speed is calculated, where the color brightness π=h(p,v). Next, the processor 21 calculates the color brightness gradient of the line between the sampling point and the adjacent sampling point according to the writing acceleration of each sampling point for which the writing acceleration is calculated, where the gradient σ=g(a) . For example, the color brightness gradient of the line between sampling point 0 and sampling point 4 is σ ₁₄ , the color brightness gradient of the line between sampling point 4 and sampling point 8 is σ ₂₄ , and so on, the sampling point The gradation of the color brightness of the line between n*4 and the sampling point (n-1)4 is σ _n4 . Subsequently, the processor 21 draws the writing trajectory according to the converted coordinate information of the multiple sampling points, and correspondingly adjusts the color intensity of the multiple sampling points on the writing trajectory according to the color brightness of the multiple sampling points for which the color brightness is calculated, and Adjust the color depth changes of the corresponding lines according to the multiple color brightness gradients, thereby generating the final display handwriting. It can be understood that if the user's writing speed gradually increases, the color will gradually become lighter; if the user's writing speed gradually decreases, the line will gradually become darker. Therefore, the color of the line in the writing track can be adjusted according to the writing acceleration of multiple sampling points, so that the final color of the line (especially the position of the pen tip) that displays the handwriting has the effect of gradual gradient, which is consistent with the actual user The writing effect is more consistent, and the reduction of handwriting is higher.

Please refer to FIG. 14. In some embodiments, the written data includes pressure data and collection interval time. Step S13 generating and displaying handwriting according to the writing track and writing data includes:

S1361: Calculate the radius of each sampling point according to the pressure data of each sampling point;

S1362: Calculate the writing speed of at least one sampling point according to the collection interval time and coordinate information;

S1363: Calculate the color brightness of at least one sampling point according to the writing speed and pressure data of the at least one sampling point;

S1364: Calculate the writing acceleration of at least one sampling point according to the collection interval time and coordinate information;

S1365: Calculate the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point, and calculate the sampling point and the adjacent sampling point according to the writing acceleration of the at least one sampling point The color brightness gradient of the line between the sampling points;

S1366: Display multiple sampling points on the writing track with the radius and color brightness corresponding to the sampling points, the radius of the line between the two sampling points is displayed according to the gradient of the corresponding radius, and the line between the two sampling points The color brightness of is displayed according to the corresponding color brightness gradual change to generate display handwriting.

Referring to FIG. 2 again, in some embodiments, step S1361, step S1362, step S1363, step S1364, step S1365, and step S1366 can all be implemented by the processor 21. In other words, the processor 21 can also be used to calculate the radius of each sampling point according to the pressure data of each sampling point, calculate the writing speed of at least one sampling point according to the sampling interval time and coordinate information, and according to the writing speed of at least one sampling point. Speed and pressure data calculate the color brightness of at least one sampling point, calculate the writing acceleration of at least one sampling point according to the collection interval time and coordinate information, and calculate the difference between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point The gradient of the radius of the line between the sample points, and calculate the color brightness gradient of the line between the sample point and the adjacent sample point according to the writing acceleration of at least one sample point, and the multiple sample points on the writing track to match The radius and color brightness of the sampling points should be displayed, the radius of the line between the two sampling points should be displayed according to the corresponding radius gradient change, and the color brightness of the line between the two sampling points should be displayed according to the corresponding color brightness gradient change. Generate display handwriting.

Specifically, please refer to Figure 4 again, assuming that there are sampling points 0, 1, 2, 3,..., m, m ∈ N, and the preset number of intervals L=4. At this time, some sampling points have coordinate information, pressure data, and For these three types of data collection interval, some sampling points only have two types of data: coordinate information and pressure data. The processor 21 first converts the coordinate information of each sampling point (the coordinate information is the coordinate information of the sampling point on the writing board 12) into the coordinate information of the sampling point on the electronic display device 20. Subsequently, the processor 21 calculates the radius of the corresponding sampling point according to the pressure data of each sampling point, where the radius ρ=f(p). Subsequently, the processor 21 calculates the writing speed and writing acceleration of the sampling points with the sampling interval based on the coordinate information and the sampling interval time of multiple sampling points (except sampling point 0, the velocity v _{04 of} sampling point 0 is 0 by default). The calculation method of the writing speed and the writing acceleration of the sampling points with the collection interval time is as described above, and will not be repeated here. Subsequently, the processor 21 calculates the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of each sampling point for which the writing acceleration is calculated. Next, the processor 21 calculates the color brightness of the corresponding sampling point according to the pressure information and writing speed of each sampling point for which the writing speed is calculated, and calculates the sampling point and The color lightness gradient of the line between adjacent sampling points. Subsequently, the processor 21 draws the writing trajectory according to the converted coordinate information of the multiple sampling points, correspondingly adjusts the thickness of each sampling point on the writing trajectory according to the radius of each sampling point, and adjusts the radius of the corresponding line according to the gradient of multiple radii According to the color brightness of multiple sampling points for which the color brightness is calculated, the color brightness of the multiple sampling points on the writing track is adjusted correspondingly, and the color depth of the corresponding line is adjusted according to the multiple color brightness gradients, To generate the final display handwriting. In this way, the thickness of the line in the writing track can be adjusted according to the writing acceleration of multiple sampling points, and the color of the line in the writing track can be adjusted according to the writing acceleration of multiple sampling points, so that the final generated display handwriting The line (especially the position of the pen tip) has the effect of gradual gradation of thickness, and the effect of gradual gradation of color, which is more consistent with the actual writing effect of the user, and the handwriting has a higher degree of restoration.

In some embodiments, the radius of the sampling point is not only associated with the pressure data, but also associated with the type of the writing pen 11, that is, ρ=f(p,type), where type is the type of the writing pen 11. It can be understood that different types of writing pens 11 may have different pen tip diameters. When the user writes with the same pressure, the writing pen 11 with a larger tip diameter writes thicker handwriting, while the writing pen 11 with a smaller tip diameter writes thinner handwriting. Therefore, the electronic display device 20 first determines the type of the writing pen 11 before drawing the handwriting, and then calculates the radius of each sampling point according to the type of the writing pen 11 and the pressure of each sampling point. In this way, the reduction of handwriting can be further improved.

In some embodiments, the color brightness of the sampling point is not only associated with pressure data and writing speed, but also associated with the type of writing pen 11, that is, π=h(p,v,type), where type is writing The type of pen 11. It can be understood that different types of writing pens 11 may have different pen tip diameters. When the user writes with the same pressure and the same speed, the pen 11 with a larger nib diameter writes a darker handwriting, while the pen 11 with a smaller nib diameter writes a lighter handwriting. Therefore, the electronic display device 20 first determines the type of the writing pen 11 before drawing the handwriting, and then calculates the color brightness of the sampling point according to the type of the writing pen 11, the pressure of the sampling point, and the writing speed. In this way, the reduction of handwriting can be further improved.

In some embodiments, in addition to being associated with the writing acceleration, the gradient of the sampling point is also associated with the type of the writing pen 11, that is, σ=g(a, type), where type is the type of the writing pen 11. It can be understood that different types of writing pens 11 may have different pen tip diameters. When the pressure data, writing speed and writing acceleration are consistent, the thickness change of the handwriting written by the pen 11 with a larger nib diameter may be different from the thickness change of the handwriting written by the pen 11 with a smaller nib diameter. The nib diameter is larger. The color depth change of the handwriting written by the writing pen 11 may be different from the color depth change of the handwriting written by the writing pen 11 with a smaller tip diameter. Therefore, the electronic display device 20 first determines the type of the writing pen 11 before drawing the handwriting, and then calculates the radius of the handwriting and the gradation of the color brightness between the two sampling points according to the type of the writing pen 11 and the writing acceleration of the sampling points. In this way, the reduction of handwriting can be further improved.

The type of the writing pen 11 can be sent to the electronic display device 20 by the writing board 12. Specifically, in one embodiment, each writing pen 11 has a unique identifier, and different writing pens 11 have different identifiers. When the writing board 12 and the writing pen 11 are connected in wireless communication, the writing pen 11 sends its own identification to the writing board 12, and then the writing board 12 sends it to the electronic display device 20 to inform the electronic display device 20 of the type of the writing pen 11. In another embodiment, each writing pen 11 has a unique identifier, and different writing pens 11 have different identifiers. The writing pen 11 directly sends its own identification to the electronic display device 20 before writing to inform the electronic display device 20 of its own type. In another embodiment, the type of the writing pen 11 is identified by the writing pad 12. After the writing pad 12 receives the touch of the writing pen 11, the writing is determined according to the size of the touch area between the writing pen 11 and the writing pad 12 The type of pen 11. After the writing board 12 recognizes the type of the writing pen 11, it sends the type of the writing pen 11 to the electronic display device 20 to inform the electronic display device 20 of the type of the writing pen 11.

Please refer to Figure xx. In some embodiments, the handwriting processing method of the embodiment of the present application further includes before step S11:

S14: Send a preset interval number signal to the writing pad 12. The preset interval number signal is used to instruct the writing pad 12 to select a part of the sampling points from a plurality of sampling points according to the preset interval number, and to determine the selected sampling point The collection interval time is calculated.

Please refer to FIG. 2 again. In some embodiments, step S14 may be implemented by the communication module 22. That is to say, the communication module 22 can be used to send a predetermined interval number signal to the writing board 12.

Specifically, the preset number of intervals may be set by the user. For example, the user inputs the preset number of intervals in the electronic display device 20, and the electronic display device 20 stores the preset number of intervals in the memory 23 after receiving the user input. in. Each time the electronic display device 20 establishes a communication connection with the writing device 10, the electronic display device 20 sends the preset number of intervals to the writing device 10, and the writing device 10 determines the sampling point to calculate the collection interval time according to the preset number of intervals. The number of preset intervals is closely related to the color brightness. The smaller the number of preset intervals, the more the number of sampling points for calculating the color brightness. After adjusting the writing trajectory based on more color brightness, the generated display handwriting is closer to the actual handwriting, and the reproduction of the handwriting is higher. . The larger the number of preset intervals, the smaller the number of sampling points that need to be calculated for color brightness, which is beneficial to reducing the power consumption of the electronic display device 20. The number of preset intervals can be set by the user to better meet the user's needs. It can be understood that in different scenarios, users may have different requirements for the degree of restoration of the displayed handwriting. For example, when the user only uses the writing device 10 to record meeting records and class notes, the user may have relatively low requirements for the restoration of the displayed handwriting. In this case, the number of preset intervals can be set to a larger value; When using the writing device 10 to practice copybooks, drawing (such as character sketches), etc., the user may have relatively high requirements for the restoration of the displayed handwriting. At this time, the preset number of intervals can be set to a smaller value. Of course, the number of preset intervals can also be set by the electronic display device 20 according to different usage scenarios, or directly by the writing device 10 according to different usage scenarios. Among them, the usage scenario can be identified based on the written content. In this way, the intelligence of the electronic display device 20 or the writing device 10 can be improved.

In summary, the handwriting processing method, the electronic display device 20, and the writing system 100 according to the embodiments of the present application generate display handwriting based on coordinate information and writing data. The handwriting generated by the user is relatively similar to the handwriting written by the user on paper. Show the personal style of the writer, which is conducive to improving the user experience.

In the description of this specification, the description with reference to the terms “one embodiment”, “some embodiments”, “exemplary embodiments”, “examples”, “specific examples” or “some examples” etc. means to combine the described implementations The specific features, structures, materials, or characteristics described in the manners or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above-mentioned terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials, or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

Although the embodiments of the present application have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations to the present application. Those of ordinary skill in the art can comment on the foregoing within the scope of the present application. The implementation mode undergoes changes, modifications, replacements and modifications.

Claims (23)

1. A handwriting processing method is applied to an electronic display device that communicates with a writing board, wherein the handwriting processing method includes:

   Acquiring coordinate information and writing data of multiple sampling points when the writing board receives a writing operation;

   Forming a writing track according to the coordinate information; and

   The display handwriting is generated according to the writing trajectory and the writing data.
2. The handwriting processing method according to claim 1, wherein the writing data includes pressure data, and the generating and displaying handwriting based on the writing trajectory and the writing data includes:

   Calculating the radius of each sampling point according to the pressure data of each sampling point; and

   Displaying the plurality of sampling points on the writing track with the radius corresponding to the sampling point to generate the display handwriting.
3. The handwriting processing method according to claim 1, wherein the writing data includes pressure data and a collection interval time, and generating a display handwriting based on the writing trajectory and the writing data includes:

   Calculating the writing speed of at least one sampling point according to the collection interval and the coordinate information;

   Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data; and

   The plurality of sampling points on the writing track are displayed with the color brightness corresponding to the sampling points to generate the display handwriting.
4. The handwriting processing method according to claim 1, wherein the writing data includes pressure data and a collection interval time, and generating a display handwriting based on the writing trajectory and the writing data includes:

   Calculating the radius of each sampling point according to the pressure data of each sampling point;

   Acquiring the writing speed of at least one sampling point according to the collection interval time and the coordinate information;

   Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data; and

   Displaying the plurality of sampling points on the writing track with the radius and the color brightness corresponding to the sampling points to generate the display handwriting.
5. The handwriting processing method according to claim 1, wherein the writing data includes pressure data and a collection interval time, and generating a display handwriting based on the writing trajectory and the writing data includes:

   Calculating the radius of each sampling point according to the pressure data of each sampling point;

   Calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information;

   Calculating the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point; and

   The multiple sampling points on the writing track are displayed with the radius corresponding to the sampling point, and the radius of the line between the two sampling points is displayed with the corresponding gradual change of the radius to generate The display handwriting.
6. The handwriting processing method according to claim 1, wherein the writing data includes pressure data and a collection interval time, and generating a display handwriting based on the writing trajectory and the writing data includes:

   Calculating the writing speed of at least one sampling point according to the collection interval and the coordinate information;

   Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data;

   Calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information;

   Calculating the color lightness gradient of the line between the sampling point and the sampling point that is always adjacent according to the writing acceleration of at least one sampling point; and

   The plurality of sampling points on the writing track are displayed with the color brightness corresponding to the sampling point, and the color brightness of the line between the two sampling points is displayed according to the corresponding color brightness gradual change to generate the The display handwriting.
7. The handwriting processing method according to claim 1, wherein the writing data includes pressure data and a collection interval time, and generating a display handwriting based on the writing trajectory and the writing data includes:

   Calculating the radius of each sampling point according to the pressure data of each sampling point;

   Calculating the writing speed of at least one sampling point according to the collection interval and the coordinate information;

   Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data;

   Calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information;

   Calculate the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point, and calculate the sampling point and The gradation of the color brightness of the line between the adjacent sampling points; and

   The multiple sampling points on the writing track are displayed with the radius and the color brightness corresponding to the sampling point, the radius of the line between the two sampling points is displayed according to the corresponding gradual change of the radius, The color lightness of the line between the two sampling points is displayed according to the corresponding color lightness gradient change to generate the display handwriting.
8. The handwriting processing method according to any one of claims 3, 4, 6, and 7, wherein the calculating the writing speed of at least one sampling point according to the collection interval time and the coordinate information comprises:

   Acquiring at least one of the sampling points as the current sampling point;

   Calculating the distance between the current sampling point and the previous sampling point according to the current coordinate information of the sampling point and the previous sampling point coordinate information; and

   Calculate the current writing speed of the sampling point according to the distance and the current collection time interval of the sampling point.
9. The handwriting processing method according to any one of claims 5-7, wherein calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information comprises:

   Acquiring at least one of the sampling points as the current sampling point;

   Calculate the current writing speed of the sampling point according to the current coordinate information of the sampling point, the collection time interval, and the coordinate information of the previous sampling point, and according to the coordinate information of the previous sampling point, the collection time interval , And calculating the writing speed of the previous sampling point with the coordinate information of the previous sampling point;

   The current writing acceleration of the sampling point is calculated according to the current writing speed of the sampling point, the writing speed of the previous sampling point, and the current sampling time interval of the sampling point.
10. 7. The handwriting processing method according to claims 1-7, characterized in that, before said acquiring the coordinate information and writing data of a plurality of sampling points when the writing pad receives a writing operation, the method further comprises:

    Send a preset interval number signal to the writing board, where the preset interval number signal is used to instruct the writing board to select a part of the sampling points from the plurality of sampling points according to the preset interval number , And calculate the collection interval time of the selected sampling point.
11. An electronic display device, which communicates with a writing board, characterized in that the electronic display device includes a processor, and the processor is used for:

    Acquiring coordinate information and writing data of multiple sampling points when the writing board receives a writing operation;

    Forming a writing track according to the coordinate information; and

    The display handwriting is generated according to the writing trajectory and the writing data.
12. The electronic display device according to claim 11, wherein the writing data comprises pressure data, and the processor is further configured to:

    Calculating the radius of each sampling point according to the pressure data of each sampling point; and

    Displaying the plurality of sampling points on the writing track with the radius corresponding to the sampling point to generate the display handwriting.
13. The electronic display device of claim 11, wherein the written data includes pressure data and collection interval time, and the processor is further configured to:

    Calculating the writing speed of at least one sampling point according to the collection interval and the coordinate information;

    Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data; and

    The plurality of sampling points on the writing track are displayed with the color brightness corresponding to the sampling points to generate the display handwriting.
14. The electronic display device of claim 11, wherein the written data includes pressure data and collection interval time, and the processor is further configured to:

    Calculating the radius of each sampling point according to the pressure data of each sampling point;

    Acquiring the writing speed of at least one sampling point according to the collection interval time and the coordinate information;

    Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data; and

    Displaying the plurality of sampling points on the writing track with the radius and the color brightness corresponding to the sampling points to generate the display handwriting.
15. The electronic display device of claim 11, wherein the written data includes pressure data and collection interval time, and the processor is further configured to:

    Calculating the radius of each sampling point according to the pressure data of each sampling point;

    Calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information;

    Calculating the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point; and

    The multiple sampling points on the writing track are displayed with the radius corresponding to the sampling point, and the radius of the line between the two sampling points is displayed with the corresponding gradual change of the radius to generate The display handwriting.
16. The electronic display device of claim 11, wherein the written data includes pressure data and collection interval time, and the processor is further configured to:

    Calculating the writing speed of at least one sampling point according to the collection interval and the coordinate information;

    Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data;

    Calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information;

    Calculating the color lightness gradient of the line between the sampling point and the sampling point that is always adjacent according to the writing acceleration of at least one sampling point; and

    The plurality of sampling points on the writing track are displayed with the color brightness corresponding to the sampling point, and the color brightness of the line between the two sampling points is displayed according to the corresponding color brightness gradual change to generate the The display handwriting.
17. The electronic display device of claim 11, wherein the written data includes pressure data and collection interval time, and the processor is further configured to:

    The writing data includes pressure data and collection interval time, and the generating and displaying handwriting based on the writing trajectory and the writing data includes:

    Calculating the radius of each sampling point according to the pressure data of each sampling point;

    Calculating the writing speed of at least one sampling point according to the collection interval and the coordinate information;

    Calculating the color brightness of at least one sampling point according to the writing speed of at least one sampling point and the pressure data;

    Calculating the writing acceleration of at least one sampling point according to the collection interval time and the coordinate information;

    Calculate the gradient of the radius of the line between the sampling point and the adjacent sampling point according to the writing acceleration of at least one sampling point, and calculate the sampling point and The gradation of the color brightness of the line between the adjacent sampling points; and

    The multiple sampling points on the writing track are displayed with the radius and the color brightness corresponding to the sampling point, the radius of the line between the two sampling points is displayed according to the corresponding gradual change of the radius, The color lightness of the line between the two sampling points is displayed according to the corresponding color lightness gradient change to generate the display handwriting.
18. The electronic display device according to any one of claims 13, 14, 16, 17, wherein the processor is further configured to:

    Acquiring at least one of the sampling points as the current sampling point;

    Calculating the distance between the current sampling point and the previous sampling point according to the current coordinate information of the sampling point and the previous sampling point coordinate information; and

    Calculate the current writing speed of the sampling point according to the distance and the current collection time interval of the sampling point.
19. The electronic display device according to any one of claims 15-17, wherein the processor is further configured to:

    Acquiring at least one of the sampling points as the current sampling point;

    Calculate the current writing speed of the sampling point according to the current coordinate information of the sampling point, the collection time interval, and the coordinate information of the previous sampling point, and according to the coordinate information of the previous sampling point, the collection time interval , And calculating the writing speed of the previous sampling point with the coordinate information of the previous sampling point;

    The current writing acceleration of the sampling point is calculated according to the current writing speed of the sampling point, the writing speed of the previous sampling point, and the current sampling time interval of the sampling point.
20. The electronic display device according to any one of claims 11-17, wherein the electronic display device further comprises a communication module, and the communication module is configured to send signals of a predetermined interval number to the writing board, so The preset interval number signal is used to instruct the writing board to select a part of the sampling points from a plurality of the sampling points according to the preset interval number, and to determine the sampling interval of the selected sampling points Time to calculate.
21. A writing system, characterized in that, the writing system comprises:

    Writing pen

    Writing board, the writing board is used to receive the writing operation of the writing pen to detect the writing track of the writing pen, the writing track has a plurality of sampling points, and the plurality of sampling points correspond to coordinate information and writing Data; and

    The electronic display device of any one of claims 11-20, wherein the writing board communicates with the electronic display device.
22. 22. The writing system of claim 21, wherein the writing board comprises a processing chip and a communication unit, and the processing chip is used for:

    Each time the coordinate information of the sampling point and the writing data are collected, the coordinate information and the writing data are packaged into a data packet; and

    Marking the data packet, the data packet packaged by the coordinate information and the written data of the same sampling point corresponds to one identifier, and the data packets of different sampling points correspond to different identifiers;

    The communication unit is used to send the identified data packet to the electronic display device.
23. 22. The writing system according to claim 21, wherein the processing chip is further used to determine whether the feedback information for confirming receipt sent by the electronic display device is received;

    The communication unit is further configured to wait for a predetermined time before sending the identified data packet to the electronic display device again when the feedback information is not received.

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