CN101354621A - A method and device for determining calibration parameters of a touch screen - Google Patents
A method and device for determining calibration parameters of a touch screen Download PDFInfo
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Abstract
The invention discloses a method and a device for determining touch screen calibration parameters, which is used for solving the problem the prior art is inaccurate in touch screen calibration. In the proposal, according to a specified touch screen sampling point, an effective click region comprising the sampling point is determined, and the effective click region is identified through a physical coordinate. The calibration of a touch screen comprises the following steps that: the physical coordinate obtained by clicking the specified touch screen sampling point is acquired, and when the acquired physical coordinate is in the effective click region comprising the sampling point, calibration parameters are determined according to the physical coordinate and the logical coordinate of the sampling point. Through the proposal, the accuracy of the physical coordinate obtained when users click the sampling point is improved, and the accuracy of the calibration parameters determined according to the physical coordinate is correspondingly improved, thereby improving the integral performance of a system.
Description
Technical Field
The invention relates to the technical field of electronic information, in particular to a method and a device for determining a calibration parameter of a touch screen.
Background
Because electronic products based on an embedded system are favored by more and more users due to good system performance, and in order to obtain better user experience, touch screens have been widely applied to the embedded system to simplify the operation mode of the embedded system due to the advantages of simple and flexible operation, fast input speed, and the like, the design of the touch screen based on the embedded system becomes a technology which needs to be developed and perfected urgently at present.
The coordinates that can be recognized by a general system program are LCD (Liquid Crystal Display) coordinates, which are known as logical coordinates, and coordinates obtained by directly clicking on the touch screen are screen click coordinates, which are known as physical coordinates. Since the coordinate axis direction, the scale factor, the offset, the scaling factor, etc. of the XY value of the physical coordinate system are different from those of the logical coordinate system, after a certain point on the touch screen is clicked, the system program needs to make a correct response to the point, and the physical coordinate obtained by directly clicking the touch screen needs to be converted into the logical coordinate. Calibration parameters are usually stored in a configuration file of the system, and represent the correspondence between physical coordinates and logical coordinates, by which the physical coordinates can be converted into logical coordinates. However, in the using process of the touch screen, the touch screen inevitably generates a drifting phenomenon due to the influence of external environments such as temperature, humidity, finger wetting degree, body weight, ground dryness, electromagnetic noise and the like. When the touch screen drifts, the accuracy of the calibration parameters stored in the configuration file is reduced, and at this time, new calibration parameters need to be obtained by calibrating the touch screen.
The calibration process of a general touch screen is as follows: taking n points on the touch screen as sampling points, wherein the points are displayed as "+" on the touch screen for a user to click; acquiring physical coordinates respectively obtained by clicking the n sampling points by a user; and obtaining calibration parameters through a undetermined coefficient method according to the obtained physical coordinates and the logic coordinates of each sampling point pre-stored in the system, and writing the obtained calibration parameters into a configuration file in the system.
In the calibration method, a great click freedom degree exists for each sampling point user, namely, the obtained physical coordinate corresponding to the user clicking the sampling point and the physical coordinate actually corresponding to the sampling point may be greatly different, one processing method aiming at the problem is to compare the obtained physical coordinate with the physical coordinate corresponding to the same sampling point, which is stored in a system and obtained when the touch screen is calibrated last time, after the physical coordinate corresponding to the user clicking the sampling point is obtained, if the difference between the obtained physical coordinates obtained twice is large, the user is required to recalibrate once again, and if the obtained physical coordinates obtained twice are the same or have a small difference, the calibration parameters are determined according to the physical coordinate. However, if a large error exists in the physical coordinates obtained by misoperation, clicking inaccuracy and the like when the user calibrates the touch screen last time, the calibration parameters obtained this time are inaccurate, the accuracy of the whole system is affected, and the system performance is reduced.
Disclosure of Invention
The invention provides a method and a device for determining touch screen calibration parameters, which are used for solving the problem that the touch screen calibration parameters determined in the prior art are inaccurate.
The embodiment of the invention is realized by the following technical scheme:
the invention provides a method for determining touch screen calibration parameters, which determines an effective click area containing a given touch screen sampling point according to the sampling point, and comprises the following steps of:
acquiring a physical coordinate obtained by clicking the sampling point;
and when the acquired physical coordinate is in the effective clicking area, determining a calibration parameter of the touch screen according to the acquired physical coordinate and the logic coordinate of the sampling point.
The invention also provides a device for determining the calibration parameters of the touch screen, which comprises:
the area determining unit is used for determining an effective click area containing a given touch screen sampling point according to the sampling point;
the data acquisition unit is used for acquiring a physical coordinate obtained by clicking the sampling point;
and the parameter determining unit is used for determining the calibration parameters of the touch screen according to the acquired physical coordinates and the logic coordinates of the sampling points when the physical coordinates acquired by the data acquiring unit are in the effective clicking area determined by the area determining unit.
According to the technical scheme, the effective click area containing the sampling point is determined according to the given sampling point of the touch screen. When the touch screen is calibrated, acquiring a physical coordinate obtained by clicking a sampling point by a user, and when the acquired physical coordinate is in a determined effective clicking area, determining a calibration parameter according to the physical coordinate and a logic coordinate of the sampling point. The degree of freedom of the user for clicking the sampling point is limited, namely the user is determined to click effectively only when the user clicks in the effective clicking area corresponding to the sampling point, so that the accuracy of the physical coordinate obtained by the user for clicking the sampling point is improved, the accuracy of the calibration parameter determined according to the physical coordinate is correspondingly improved, and the overall performance of the system is improved.
Drawings
FIG. 1 is a schematic diagram of an effective click area corresponding to a sampling point on a touch screen in an embodiment of the present invention;
FIG. 2 is a flow chart of determining touch screen calibration parameters provided in an embodiment of the present invention;
fig. 3 is a first block diagram of a device for determining touch screen calibration parameters according to an embodiment of the present invention;
fig. 4 is a second block diagram of a device for determining touch screen calibration parameters according to an embodiment of the present invention.
Detailed Description
In view of the above-mentioned shortcomings of the existing technology for determining touch screen calibration parameters, the embodiments of the present invention provide a method and an apparatus for determining touch screen calibration parameters, and the following describes in detail the main implementation principle, specific implementation process and corresponding beneficial effects of the embodiments of the present invention with reference to the drawings of the specification.
In the embodiment of the invention, firstly, an effective click area containing a given sampling point on the touch screen is determined according to the sampling point, the effective click area is generally identified by physical coordinates, and specifically, the whole effective click area can be identified by identifying the physical coordinates of a set point in the effective click area. For example, the points on the edge of the valid click zone are identified by physical coordinates. In this embodiment, determining the effective click area of the sampling point may determine the effective click area of the sampling point according to the physical coordinates of the given sampling point of the touch screen and a preset area determination parameter. The area determining parameters can be flexibly set, for example, the area determining parameters give the shape of the effective click area as a circle with the sampling point as the center of the circle and the radius of the circle, and the effective click area determined according to the area determining parameters is an area in the circle with the physical coordinate of the sampling point as the center of the circle and the set value as the radius; or the effective click area determined according to the area determination parameters is an area in the square with the physical coordinates of the sampling points as the center and the set value as the edge-center distance.
In the above process, the number of the given touch screen sampling points may be one or more, if the number of the given touch screen sampling points is multiple, the effective click areas with the corresponding number are determined according to the multiple sampling points, each effective click area includes one sampling point, and the physical coordinates of the sampling points in each effective click area are different from each other. For convenience of understanding, as shown in fig. 1, an example of the valid click area determined when there are 5 sampling points (located at the four corners and the center of the touch screen respectively) is shown, where the "+" word represents the given 5 sampling points on the touch screen, and the area within the dotted line is the valid click area corresponding to each sampling point. It should be noted that the determination of the effective click area containing a given sampling point on the touch screen according to the sampling point is not limited to the circle and the square, and can be flexibly set to other shapes such as a triangle as needed, which is not listed here.
The setting of the size of the effective click area needs to consider the precision of a user clicking a sampling point of a touch screen and the screen calibration precision, and generally, the smaller the effective click area is, the higher the screen calibration precision is, but if the effective click area is too small, the acquisition of physical coordinates of the sampling point is also influenced.
In the above process, the points included in the effective click area are identified by physical coordinates, which can be implemented by the following steps:
firstly, accurately clicking the sampling point for multiple times by a professional operator, and counting the physical coordinate of the sampling point according to the physical coordinate obtained by clicking the sampling point every time.
And secondly, determining the physical coordinates of other points in the effective click area containing the sampling point according to the counted physical coordinates. For example, if the physical coordinates of the determined sampling point are (12, 12), the physical coordinates of the points of two adjacent pixels located on the same row as the sampling point are (14, 12).
In the first step, the physical coordinates of the sampling points are counted according to the physical coordinates obtained by clicking the sampling points each time, and the physical coordinates may be:
and determining the average value of the abscissa of the physical coordinate obtained by clicking the sampling point each time as the abscissa of the physical coordinate of the sampling point, and determining the average value of the ordinate of the physical coordinate obtained by clicking the sampling point each time as the ordinate of the physical coordinate of the sampling point. For example, four physical coordinates are obtained, namely (11, 10), (12, 12), (15, 9) and (10, 13), and the physical coordinates of the sampling points counted from the four physical coordinates are (12, 11).
Or determining the middle value of the abscissa of the physical coordinate obtained by clicking the sampling point each time as the abscissa of the physical coordinate of the sampling point, and determining the middle value of the ordinate of the physical coordinate obtained by clicking the sampling point each time as the ordinate of the physical coordinate of the sampling point. For example, four physical coordinates are obtained, namely (11, 10), (12, 12), (15, 9) and (10, 13), and the physical coordinates of the sampling points counted from the four physical coordinates are (13, 11).
After determining the effective click area of each sampling point according to the above process, as shown in fig. 2, in one embodiment, the following steps are performed when the touch screen is calibrated:
In the step, the touch screen driver displays the sampling points given by the system on the touch screen for the user to click, and the sampling points can be displayed as "+" characters on the touch screen so as to increase the accuracy of the user clicking.
And step 204, determining calibration parameters according to the physical coordinates and the logic coordinates of each sampling point.
In this step, the logical coordinates and calibration algorithm of each sampling point are pre-stored in the system, the calibration algorithm generally adopted is an undetermined coefficient method, and the calibration parameters can be calculated by the following formula:
XLn＝AXn+BYn+C；
YLn＝DXn+EYn+F。
wherein, (XLn, YLn) represents a logical coordinate of an nth sampling point;
and (Xn, Yn) represents the physical coordinates obtained by the acquired n-th sampling point of the click.
And respectively substituting the determined physical coordinates and logical coordinates of each sampling point into the formula to solve the coefficient A, B, C, D, E, F, so as to obtain the corresponding relation between the physical coordinates and the logical coordinates, namely the calibration parameters.
And step 205, storing the obtained calibration parameters into a configuration file in the system.
In practical application, the touch screen can be calibrated by calling a calibration-like program, and the physical coordinates of sampling points on the touch screen clicked by a user are read by a touch screen driver, which is specifically as follows:
in step 201, the sampling point clicked by the user may be called: and (4) displaying the sampling point as a "+" character on the touch screen interface for the user to click.
In step 202, the following steps may be invoked: pxa27xMouseHandler: readMouseData, acquires physical coordinates obtained by a user clicking a "+" word on a touch screen, and writes the physical coordinates into an environment variable.
In step 203, by invoking: the Calibrate is that the mouseReleaseEvent takes out the physical coordinate value of the sampling point from the environment variable and judges whether the taken out physical coordinate is in the corresponding effective click area, if so, the next step is executed; if not, prompting the user to make mistakes and re-taking the value until the user clicks in the limited effective clicking area.
In the step 204, by invoking: calibration, namely calculating calibration parameters according to the extracted physical coordinates and logical coordinates.
In step 205, by invoking: calibrate write calibration, write calibration parameters into configuration file.
An embodiment of the present invention further provides an apparatus for calibrating a touch screen, where the apparatus may have a structure as shown in fig. 3, and the apparatus includes: an area determination unit 301, a data acquisition unit 302, and a parameter determination unit 303. Wherein,
the area determination unit 301 is configured to determine, according to a given touch screen sampling point, an effective click area containing the sampling point.
The data obtaining unit 302 is configured to obtain a physical coordinate obtained by a user clicking a given sampling point on the touch screen.
A parameter determining unit 303, configured to determine a calibration parameter according to the physical coordinate and the logical coordinate of the sampling point when the physical coordinate acquired by the data acquiring unit 302 is within the valid click region determined by the region determining unit 301.
In one embodiment, the area determining unit 301 is further configured to determine a valid click area containing the sampling point based on the physical coordinates of the sampling point.
In one embodiment, the area determining unit 301 is further configured to determine the physical coordinates of the sampling point according to a plurality of physical coordinates obtained by clicking the sampling point multiple times.
As shown in fig. 4, in an embodiment, the apparatus may further include a prompting unit 304, configured to prompt to re-click the sampling point when it is determined that the physical coordinates acquired by the data acquiring unit 302 are not within the valid click region determined by the region determining unit 301.
According to the technical scheme, the effective click area containing the sampling point is determined according to the given sampling point of the touch screen. When the touch screen is calibrated, acquiring a physical coordinate obtained by clicking a sampling point by a user, and when the acquired physical coordinate is in a determined effective clicking area, determining a calibration parameter according to the physical coordinate and a logic coordinate of the sampling point. The degree of freedom of the user for clicking the sampling point is limited, namely the user is determined to click effectively only when the user clicks in an effective clicking area corresponding to the sampling point, otherwise, the user is required to click again, so that the accuracy of the obtained physical coordinate obtained by the user for clicking the sampling point is increased, the accuracy of the calibration parameter determined according to the physical coordinate is correspondingly increased, and the overall performance of the system is improved.
In addition, in the embodiment of the invention, when the physical coordinate obtained by clicking the sampling point by the user is not the corresponding physical coordinate in the effective clicking area which contains the sampling point, the user is prompted to click the sampling point again, so that more accurate calibration parameters can be obtained timely and effectively.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for determining calibration parameters of a touch screen is characterized in that an effective click area containing sampling points of the touch screen is determined according to the given sampling points of the touch screen, and when the touch screen is calibrated, the method comprises the following steps:
acquiring a physical coordinate obtained by clicking the sampling point;
and when the acquired physical coordinate is in the effective clicking area, determining a calibration parameter of the touch screen according to the acquired physical coordinate and the logic coordinate of the sampling point.
2. The method of claim 1, wherein determining from a given touch screen sampling point a valid click area containing the sampling point comprises:
and determining an effective click area containing the sampling points by taking the physical coordinates of the sampling points as a reference.
3. The method of claim 2, wherein the physical coordinates of the sample points are determined from a plurality of physical coordinates obtained from clicking on the sample points a plurality of times.
4. The method of claim 2, wherein determining the valid click region containing the sample point based on the physical coordinates of the sample point comprises:
determining an area inside a circle with the physical coordinates of the sampling points as the circle center and a set value as the radius as an effective click area containing the sampling points;
or, determining an area in the square with the physical coordinates of the sampling points as the center and the set value as the edge-to-center distance as an effective click area containing the sampling points.
5. The method of claim 1, wherein the given touch screen sample point is one or more;
when the sampling point is multiple, determining an effective click area containing the sampling point according to the given touch screen sampling point, wherein the effective click area comprises:
and determining effective click areas with corresponding quantity according to the plurality of sampling points, wherein each effective click area comprises one sampling point, and the physical coordinates of the sampling points in each effective click area are different from each other.
6. The method of any one of claims 1 to 5, wherein when the acquired physical coordinates are not within the valid click zone, prompting a re-click of the sample point.
7. An apparatus for determining touch screen calibration parameters, comprising:
the area determining unit is used for determining an effective click area containing a given touch screen sampling point according to the sampling point;
the data acquisition unit is used for acquiring a physical coordinate obtained by clicking the sampling point;
and the parameter determining unit is used for determining the calibration parameters of the touch screen according to the acquired physical coordinates and the logic coordinates of the sampling points when the physical coordinates acquired by the data acquiring unit are in the effective clicking area determined by the area determining unit.
8. The apparatus of claim 7, wherein the region determining unit is further configured to determine a valid click region containing the sampling point based on physical coordinates of the sampling point.
9. The apparatus of claim 8, wherein the region determining unit is further configured to determine the physical coordinates of the sampling point according to a plurality of physical coordinates obtained by clicking the sampling point a plurality of times.
10. The apparatus of claim 7, further comprising:
and the prompting unit is used for prompting to click the sampling point again when the physical coordinate acquired by the data acquisition unit is not in the effective click area determined by the area determination unit.
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