TWI861636B - Touch track matching method, touch module and information processing device - Google Patents

Abstract

A touch track fitting method is implemented by a control circuit, the method comprising: periodically reading a touch point coordinate from a sensing array; forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, the second straight line being the coordinate of the midpoint plus the product of a first parameter and a unit direction vector; and calculating the first parameter from the intersection of the first straight line and the second straight line, substituting the first parameter into a landing point correction function to obtain a second parameter, and replacing the first parameter with the second parameter in the second straight line to obtain an interpolated point coordinate.

Description

Touch track matching method, touch module and information processing device

The present invention relates to touch data processing, and more particularly to a touch track fitting scheme.

In order to increase touch reporting points, existing touch technology adds interpolation points between multiple sensed touch points. For example, the third-order Bessel algorithm is used to operate four known points to generate a fitting trajectory, and then interpolation points are generated on the fitting trajectory.

However, the Bessel algorithm has probabilistic burrs, and its fitting trajectory has insufficient curvature and inflection.

To solve the above problems, a novel touch trajectory fitting method is urgently needed in this field.

One purpose of the present invention is to disclose a touch trajectory fitting method, which can generate interpolation points by three touch points to reduce the amount of calculation.

Another object of the present invention is to disclose a touch trajectory fitting method, which can determine the position of the interpolation point on the perpendicular line between the connecting line segment of the current touch point and the previous touch point by an exponential model to optimize the curvature of the fitting trajectory.

Another object of the present invention is to disclose a touch module that can reduce the amount of calculation and optimize the curvature of the fitting trajectory by using the aforementioned touch trajectory fitting method.

Another object of the present invention is to disclose an information processing device that can reduce the amount of calculation of the fitting trajectory and optimize the curvature of the fitting trajectory by using the aforementioned touch module.

To achieve the above-mentioned purpose, a touch trajectory fitting method is proposed, which is implemented by a control circuit, and the method includes: Periodically reading a touch point coordinate from a sensing array; Forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, the second straight line is the coordinate of the midpoint plus the product of a first parameter and a unit direction vector; and The first parameter is calculated from the intersection of the first straight line and the second straight line, and the first parameter is substituted into a drop point correction function to obtain a second parameter, and the second parameter is substituted for the first parameter in the second straight line to obtain an interpolation point coordinate.

In one embodiment, the landing point correction function includes an exponential function, and its function value is between 0 and 1.

In one embodiment, the touch trajectory fitting method further includes: the control circuit sequentially transmits the current touch point coordinates and the interpolation point coordinates to an application processor via a communication interface.

To achieve the above-mentioned purpose, the present invention further proposes a touch module having a control circuit and a sensing array, wherein the control circuit executes a touch trajectory fitting procedure, the procedure comprising: Periodically reading a touch point coordinate from the sensing array; Forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, the second straight line being the coordinate of the midpoint plus the product of a first parameter and a unit direction vector; and The first parameter is calculated from the intersection of the first straight line and the second straight line, and the first parameter is substituted into a drop point correction function to obtain a second parameter, and the second parameter is substituted for the first parameter in the second straight line to obtain an interpolation point coordinate.

In one embodiment, the landing point correction function includes an exponential function, and its function value is between 0 and 1.

In one embodiment, the touch trajectory fitting procedure further includes: the control circuit sequentially transmits the current touch point coordinates and the interpolation point coordinates to an application processor via a communication interface.

In possible embodiments, the sensing array may be a capacitive sensing array, an ultrasonic sensing array, a pressure sensing array or an optical sensing array.

To achieve the above-mentioned purpose, the present invention further proposes an information processing device, which has a touch module and an application processor, wherein the touch module has a control circuit and a sensing array, and is characterized in that the control circuit executes a touch trajectory fitting program, which includes: Periodically reading a touch point coordinate from the sensing array; Forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, wherein the second straight line is the coordinate of the midpoint plus the product of a first parameter and a unit direction vector; and The first parameter is calculated from the intersection of the first straight line and the second straight line, and the first parameter is substituted into a drop point correction function to obtain a second parameter, and the second parameter is substituted for the first parameter in the second straight line to obtain an interpolation point coordinate.

In one embodiment, the landing point correction function includes an exponential function, and its function value is between 0 and 1.

In one embodiment, the touch trajectory fitting procedure further includes: the control circuit sequentially transmits the current touch point coordinates and the interpolation point coordinates to the application processor via a communication interface.

In possible embodiments, the sensing array may be a capacitive sensing array, an ultrasonic sensing array, a pressure sensing array or an optical sensing array.

In possible embodiments, the information processing device may be a smart phone, a portable computer or a car computer.

In order to enable the Review Committee to further understand the structure, features, purpose, and advantages of the present invention, the following are attached with drawings and detailed descriptions of preferred specific embodiments.

The principle of the present invention is to use linear calculation combined with an exponential model to generate interpolation points.

Please refer to FIG. 1, which illustrates the interpolation point determination method of the present invention. As shown in FIG. 1, are the coordinates of the three touch points. For connection A straight line The endpoint is The perpendicular bisector of the line segment, and Intersect ,in and It can be expressed as follows:

: ;

: ,in, .

will Substitute the equation Equation Solving Point The corresponding parameter t is then substituted into the exponential model ,in To optimize the parameters, the experimental results show that The final interpolation point for .

Please refer to FIG2, which shows a block diagram of an embodiment of the touch module of the present invention. As shown in FIG2, a touch module 100 has a control circuit 110 and a sensing array 120, and the control circuit 110 has a read circuit 111, a memory 112, a control unit 113 and a communication interface 114, wherein the read circuit 111 is used to read the touch point data from the sensing array 120, the memory 112 stores the touch point data, the control unit 113 executes a touch track fitting program, and the communication interface 114 is used to communicate with an application processor. In addition, the sensing array 120 may be a capacitive sensing array, an ultrasonic sensing array, a pressure sensing array, or an optical sensing array.

The touch trajectory fitting process includes the following steps:

(i) The touch point coordinates are periodically read out by the readout circuit 111 from the sensing array 120;

(ii) the control unit 113 forms a first straight line according to a previous touch point coordinate and a previous touch point coordinate; and forms a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, wherein the second straight line is a product of the coordinate of the midpoint plus a first parameter and a unit direction vector;

(iii) the control unit 113 calculates the first parameter from the intersection of the first straight line and the second straight line, and substitutes the first parameter into a drop point correction function to obtain a second parameter, wherein the drop point correction function preferably includes an exponential function, and its function value is between 0 and 1; and

(iv) The control unit 113 replaces the first parameter with the second parameter in the second straight line to obtain an interpolation point coordinate.

In addition, after obtaining the interpolation point coordinates, the control unit 113 can sequentially transmit the current touch point coordinates and the interpolation point coordinates to the application processor via the communication interface 114. In this way, the present invention can optimize the simulation effect of a touch track.

As can be seen from the above, the present invention discloses a touch track fitting method. Please refer to FIG3 , which shows a flow chart of an embodiment of the touch track fitting method of the present invention, which is implemented by a control circuit. As shown in FIG. 3 , the method includes: periodically reading a touch point coordinate from a sensing array (step a); forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, wherein the second straight line is a product of the coordinate of the midpoint plus a first parameter and a unit direction vector (step b); calculating the first parameter from the intersection of the first straight line and the second straight line, and substituting the first parameter into a landing point correction function to obtain a second parameter (step c); and replacing the first parameter with the second parameter in the second straight line to obtain an interpolated point coordinate (step d).

In the above steps, the sensing array can be a capacitive sensing array, an ultrasonic sensing array, a pressure sensing array or an optical sensing array; and the landing point correction function preferably includes an exponential function, and its function value is between 0 and 1.

In addition, after obtaining the interpolation point coordinates, the control unit can sequentially transmit the current touch point coordinates and the interpolation point coordinates to an application processor via a communication interface.

Please refer to Figures 4a-4c, which show the comparison diagrams of the touch trajectory fitting method of the present invention and the fitting trajectory of the existing third-order Bessel algorithm. As can be seen from Figures 4a-4c, the fitting trajectory 2 of the present invention is smoother and has no burrs or inflection compared to the fitting trajectory 1 of the existing third-order Bessel algorithm.

According to the above description, the present invention further proposes an information processing device. Please refer to FIG. 5, which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 5, an information processing device 200 has a touch module 210 and an application processor 220, wherein the touch module 210 is implemented by the touch module 100, and the application processor 220 is used to periodically receive the current touch point coordinates and interpolation point coordinates output by the touch module 210.

In addition, the information processing device 200 may be a smart phone, a portable computer or a car computer.

Through the above disclosed design, the present invention has the following advantages:

1. The touch trajectory fitting method of the present invention can generate interpolation points by using three touch points to reduce the amount of calculation.

2. The touch trajectory fitting method of the present invention can determine the position of the interpolation point on the perpendicular line between the connecting line segment of the current touch point and the previous touch point by an exponential model to optimize the curvature of the fitting trajectory.

3. The touch module of the present invention can reduce the amount of calculation and optimize the curvature of the fitting trajectory through the aforementioned touch trajectory fitting method.

4. The information processing device of the present invention can reduce the amount of calculation of the fitting trajectory and optimize the curvature of the fitting trajectory through the aforementioned touch module.

The invention disclosed in this case is a preferred embodiment. Any partial changes or modifications that are derived from the technical concept of this case and are easily inferred by people familiar with the art do not deviate from the scope of the patent rights of this case.

In summary, this case shows that its purpose, means and effects are all different from the known technology, and it is the first invention that is practical and indeed meets the patent requirements for invention. We sincerely request the review committee to examine this carefully and grant a patent as soon as possible to benefit the society. This is our utmost prayer.

1: Fit track 2: Fit track 100: Touch module 110: Control circuit 111: Read circuit 112: Memory 113: Control unit 114: Communication interface 120: Sensing array 200: Information processing device 210: Touch module 220: Application processor Step a: Periodically read a touch point coordinate from a sensing array Step b: Form a first straight line based on the coordinates of a previous touch point and the coordinates of the previous touch point, and form a second straight line perpendicular to the line segment at a midpoint of a line segment connecting the coordinates of a current touch point and the coordinates of the previous touch point, the second straight line being the coordinates of the midpoint plus the product of a first parameter and a unit direction vector Step c: Calculate the first parameter from the intersection of the first straight line and the second straight line, and substitute the first parameter into a drop point correction function to obtain a second parameter Step d: Replace the first parameter with the second parameter in the second straight line to obtain an interpolated point coordinate

FIG. 1 illustrates a method for determining an interpolation point of the present invention. FIG. 2 illustrates a block diagram of an embodiment of a touch module of the present invention. FIG. 3 illustrates a flow chart of an embodiment of a touch trajectory fitting method of the present invention. FIG. 4a to 4c illustrate a comparison diagram of the touch trajectory fitting method of the present invention and the fitting trajectory of the existing third-order Bessel algorithm. FIG. 5 illustrates a block diagram of an embodiment of an information processing device of the present invention.

Step a: Periodically read the coordinates of a touch point from a sensing array

Step b: Form a first straight line based on the coordinates of a previous touch point and the coordinates of the previous touch point, and form a second straight line perpendicular to a line segment at a midpoint of a line segment connecting the coordinates of a current touch point and the coordinates of the previous touch point. The second straight line is the coordinate of the midpoint plus the product of a first parameter and a unit direction vector.

Step c: Calculate the first parameter from the intersection of the first straight line and the second straight line, and substitute the first parameter into a landing point correction function to obtain a second parameter

Step d: Replace the first parameter with the second parameter in the second straight line to obtain an interpolation point coordinate

Claims (9)

A touch track fitting method is implemented by a control circuit, the method comprising: periodically reading a touch point coordinate from a sensing array; forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to a line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, the second straight line being the coordinate of the midpoint plus a first parameter and a unit direction. The unit direction vector is a vector parallel to the second straight line and has a length of l; the first parameter is calculated from the intersection of the first straight line and the second straight line, and the first parameter is substituted into a drop point correction function to obtain a second parameter, and the second parameter replaces the first parameter in the second straight line to obtain an interpolated point coordinate; wherein the drop point correction function includes an exponential function, and its function value is between 0 and 1. The touch track fitting method as described in claim 1 further includes: the control circuit sequentially transmits the current touch point coordinates and the interpolation point coordinates to an application processor via a communication interface. A touch module has a control circuit and a sensing array, wherein the control circuit executes a touch track fitting procedure, the procedure comprising: periodically reading a touch point coordinate from the sensing array; forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to the line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, the second straight line being the coordinate of the midpoint plus a first straight line; The product of a parameter and a unit direction vector, wherein the unit direction vector is a vector parallel to the second straight line and has a length of l; and the first parameter is calculated from the intersection of the first straight line and the second straight line, and the first parameter is substituted into a drop point correction function to obtain a second parameter, and the second parameter is substituted for the first parameter in the second straight line to obtain an interpolated point coordinate; wherein the drop point correction function includes an exponential function, and its function value is between 0 and 1. The touch module as described in claim 3, wherein the touch trajectory fitting procedure further includes: the control circuit sequentially transmits the current touch point coordinates and the interpolation point coordinates to an application processor via a communication interface. A touch control module as described in claim 3, wherein the sensing array is a sensing array selected from a group consisting of a capacitive sensing array, an ultrasonic sensing array, a pressure sensing array, and an optical sensing array. An information processing device has a touch module and an application processor, wherein the touch module has a control circuit and a sensing array, and is characterized in that the control circuit executes a touch trajectory fitting program, the program comprising: periodically reading a touch point coordinate from the sensing array; forming a first straight line according to a previous touch point coordinate and a previous previous touch point coordinate, and forming a second straight line perpendicular to the line segment at a midpoint of a line segment connecting a current touch point coordinate and the previous touch point coordinate, the second straight line The line table is the coordinates of the midpoint plus the product of a first parameter and a unit direction vector, wherein the unit direction vector is a vector parallel to the second straight line and has a length of l; and the first parameter is calculated from the intersection of the first straight line and the second straight line, and the first parameter is substituted into a drop point correction function to obtain a second parameter, and the second parameter replaces the first parameter in the second straight line to obtain an interpolated point coordinate; wherein the drop point correction function includes an exponential function, and its function value is between 0 and 1. The information processing device as described in claim 6, wherein the touch trajectory fitting procedure further includes: the control circuit sequentially transmits the current touch point coordinates and the interpolation point coordinates to the application processor via a communication interface. An information processing device as described in claim 6, wherein the sensing array is a sensing array selected from a group consisting of a capacitive sensing array, an ultrasonic sensing array, a pressure sensing array, and an optical sensing array. The information processing device as described in claim 6 is a device selected from a group consisting of a smart phone, a portable computer and a car computer.

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