JPH11161427A - Data input device and coordinate conversion method applied to the data input device - Google Patents

Abstract

(57) [Summary] [Problem] To always realize accurate coordinate conversion processing by detecting a deviation of a conversion coefficient (calibration) based on a user's input instruction to a touch panel and automatically correcting the deviation. It is in. A touch panel type data input device having a calibration function. This apparatus assumes that the input operation range of the touch panel 1 and the display range of the screen 2 match each other, and the screen coordinate values obtained by the coordinate conversion process in response to the input instruction to the touch panel 1 are displayed on the screen 2. (Step S2). When the screen coordinate value is outside the display range of the screen 2, the shift information of the conversion coefficient corresponding to the shift amount from the predetermined reference position within the display range of the screen 2 is calculated (steps S4 and S5).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a touch panel type data input device used in, for example, a portable information terminal device, and more particularly to a coordinate conversion method for obtaining consistency between touch panel coordinates and screen coordinates.

[0002]

2. Description of the Related Art In recent years, PDAs (Personal Das) have been developed.
ta Assistants) have been developed. As a data input device of the PDA, a touch panel type input device is generally used. As shown in FIG. 11, the touch panel type input device is configured by superposing a touch panel 1 having a transparent electrode and a screen 2 constituting a display screen such as a liquid crystal panel.

The principle of operation of a touch panel type input device is that when a user presses the touch panel 1 with a pen or the like,
In this method, a voltage value corresponding to the pressed input position (the position of the input instruction) is generated, the voltage value is converted into a digital value, and the coordinates of the input instruction (hereinafter referred to as touch panel coordinates) are calculated.

On the screen 2, buttons, windows, icons, and the like (collectively referred to as objects) necessary for a data input operation are displayed. The CPU of the PDA is
An input operation is performed based on the object displayed at the display coordinates (hereinafter referred to as screen coordinates) on the screen 2 corresponding to the touch panel coordinates specified by the user. Therefore, in the touch panel input device, a coordinate conversion process from the touch panel coordinates to the screen coordinates is required in order to obtain consistency between the touch panel 1 and the screen 2. In this coordinate conversion process, a process (called calibration) for calculating a conversion coefficient (calibration coefficient) required for the conversion is required.

More specifically, the calibration means a set (、 ( _xT1 , _yT1 , _xS1 , _yS1 ), ( _xS1 ) of a set of touch panel coordinates and screen coordinates in the following equation (1).
_{T2, y T2, x S2,} y S2), ..., (x Tn, y Tn, x Sn, y
_Sn )｝), the conversion coefficients a11, a12, a13, a21, a22,
a23.

[0006]

(Equation 1)

In the calibration processing step, as shown in the flowchart of FIG. 13, a cross corresponding to the input position is displayed on the screen 2 (step S3).
0). This cross is displayed as an input position on the touch panel 1 as shown in FIG. When the user instructs the position of the cross on the touch panel 1 with a pen or the like, the touch panel coordinate values corresponding to the input instruction are stored in a memory or the like (steps S31 and S32). After obtaining a predetermined number of the touch panel coordinate values, a conversion coefficient that satisfies the expression (1) is calculated (step S3).
3, S34). That is, the user _touches the touch panel 1 on the touch panel coordinates (x _Tn , y _Tn ) and the screen coordinates (x _Sn ,
y _Sn ), the conversion coefficient a1
1, a12, a13, a21, a22, a23 are calculated.

[0008]

The above-described calibration processing has the following problems. First,
If the user inputs and inputs a point shifted from the correct position (step S31), there is a possibility that a correct conversion coefficient cannot be calculated. Second, due to a change in hardware characteristics of the touch panel 1 with the passage of time, the conversion coefficient may deviate from the actual coordinates (calibration deviation). In this case, it is necessary to repeat the calibration process.

[0009] Here, when a calibration shift occurs, as shown in FIG. 14A, when an original input position (indicated by X) of the user is designated, the touch panel coordinates are converted into screen coordinates. As a result, the system (CPU) determines the input position as shown in FIG. For this reason, since the system does not execute the input operation in response to the user's request, the user recognizes that the response is bad. In particular, if the input is possible after several retries, the user cannot recognize that the conversion coefficient does not match the correct value, and the user is likely to be underestimated.

Therefore, an object of the present invention is to realize a coordinate conversion process always accurate by detecting a shift of a conversion coefficient (calibration) based on a user's input instruction to a touch panel and automatically correcting the shift. Is to do.

[0011]

According to the present invention, in a touch panel type data input device, a conversion coefficient required for a coordinate conversion process from a touch panel coordinate value corresponding to an input instruction to a touch panel to a screen coordinate value of a screen is calculated. The device has a calibration function. This device includes a calculating unit that calculates shift information of a conversion coefficient in response to an input instruction to the touch panel, and a correction unit that corrects the conversion coefficient based on the shift information.

More specifically, on the premise that the input operation range of the touch panel and the display range of the screen match, the screen coordinate values obtained by the coordinate conversion processing in response to the input instruction to the touch panel are displayed on the screen. Means for determining whether or not the display is included in the display range. When the screen coordinate value is outside the display range of the screen, the calculation means calculates shift information of a conversion coefficient corresponding to a shift amount from a predetermined reference position within the display range of the screen.

With such a configuration, when the user executes an input instruction on the touch panel, the shift information of the conversion coefficient used for the coordinate conversion process required for the coordinate matching between the touch panel and the screen is calculated. The conversion coefficient can be automatically corrected to a correct value based on the shift information. Therefore, it is possible to always maintain the coordinate matching between the touch panel and the screen, and it is possible to realize an accurate input operation.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart relating to the first embodiment of the present invention, FIG. 2 is a block diagram showing a main part of a touch panel type data input device relating to the first embodiment, and FIGS. It is a conceptual diagram for explaining operation of an embodiment. (System Configuration) As shown in FIG. 2, the touch panel type data input device of this embodiment includes a touch panel 1 and an A /
It has a D converter 3 and a CPU 4. As shown in FIG. 3, the touch panel 1 is configured to overlap the screen 2. The screen 2 is a member for configuring a display screen such as a liquid crystal panel.

The touch panel 1 has transparent electrodes, and when a user presses the touch panel 1 with a pen or the like, a voltage value corresponding to the pressed input position (the position of the input instruction) is generated. The A / D converter 3 converts a voltage value from the touch panel 1 into a digital value and inputs the digital value to the CPU 4.
The CPU 4 calculates a conversion coefficient (calibration), calculates calibration deviation information, corrects a conversion coefficient, and performs a coordinate conversion process from touch panel coordinates to screen coordinates based on the conversion coefficient according to the present embodiment. Execute

Here, it is assumed that the input operation range (operation range) 5 of the touch panel 1 and the display range 6 of the screen 2 match as shown in FIG. This range 5,
Reference numeral 6 denotes a range visible to the user, which can be realized by, for example, providing a metal frame. (Operation of Calculating Shift Information of First Embodiment) The operation of calculating shift information of the first embodiment will be described below with reference to the flowchart of FIG. 1, and FIGS.

In the present embodiment, it is assumed that the X coordinate and the Y coordinate obtained from the touch panel 1 in response to a user's input instruction are mutually independent. At this time, in the above-described equation (1), the following equation (2) is obtained, and the equations (3) and (4) are obtained from the equation (2). further,
Conversion coefficient shift information (calibration shift information) to be described later includes an X coordinate and a Y coordinate as shown in Expressions (5) and (6).
It is assumed that the coordinates are held in each set.

[0018]

(Equation 2) Further, as described above, the operating range 5 of the touch panel 1
And the display range 6 of the screen 2 are assumed to be the same, and are expressed as follows.

[0019]

(Equation 3)

When detecting an input instruction from the user on the touch panel 1, the CPU 4 executes a coordinate conversion process for converting the touch panel coordinates corresponding to the input position into screen coordinates (step S1). The CPU 4 checks whether or not the calculated screen coordinates (represented by (xc, yc)) after the coordinate conversion processing are included in the screen frame (display range 6 of the screen 2) (step S2). Specifically, the CPU 4 determines whether or not the screen coordinates corresponding to the input position are included in the display range 6 of the screen 2 based on the following equations (7) and (8).

[0021]

(Equation 4)

When the screen coordinates corresponding to the input position are included in the display range 6 of the screen 2, the CPU 4 determines that the conversion coefficient (calibration coefficient) is appropriate (YES in step S3). On the other hand, if the screen coordinates are not included in the display range 6 of the screen 2, the CPU 4 updates the maximum value and the minimum value of the touch panel coordinates (xT, yT) as follows (step S4).

[0023]

(Equation 5)

Then, based on the updated maximum and minimum values of the touch panel coordinates (xT, yT), the CPU 4 calculates
The following deviation information (X coordinate and Y coordinate) between the touch panel coordinates and the screen coordinates is calculated (updated) (step S5).

[0025]

(Equation 6)

As described above, in the present embodiment, if the conversion coefficient used in the coordinate conversion processing is appropriate, it is assumed that the screen coordinates after conversion fall within the display range 6 of the screen 2 and the input screen is changed in accordance with the input instruction. The transform coordinates obtained are screen 2
It is determined whether or not the display range 6 is included. Based on the result of this determination, as shown in FIG. 4, for example, if the conversion coordinates 61 are outside the display range 6 of the screen 2, the conversion information of the conversion coefficient is calculated. The example shown in FIG. 4 is a case where the transformed coordinate 61 is out of the range by the shift amount d in the y direction. Based on the calculated (updated) deviation information, a correction process of the conversion coefficient is executed as described later (Equations (23) to (2)).
9)). (Second Embodiment) Hereinafter, an operation of calculating deviation information related to the second embodiment will be described with reference to a flowchart of FIG.

In this embodiment, when the user's input operation on the touch panel 1 is a meaningless operation, the CPU 4 estimates that the conversion coefficient is shifted (step S1).
0, YES in S11). Here, the meaningless input operation is specifically assumed to have the contents shown in Table 1 below. The tap is an operation of tapping the touch panel 1 lightly with a pen, and the double tap is an operation of repeating the tap twice. Also, dragging means an operation of moving on the touch panel 1 with the pen down. These are operations corresponding to click, double click, and drag in the case of a mouse, respectively.

[0028]

[Table 1]

Table 1 also shows objects (hereinafter, referred to as target objects) such as buttons and windows that are presumed to be operated. In other words, if the operation content is tapped or double-tapped and does not correspond to any event, it is estimated that a nearby button has been tapped or double-tapped. Further, when a region for moving a window is tapped or double-tapped, such as a menu bar, it is estimated that a tap operation or a double-tap is performed on a nearby button instead of a drag operation. Furthermore, when a drag operation is performed in an area without a window,
It is estimated that the user was trying to drag a nearby window.

By utilizing the detection of such a meaningless input operation, the CPU 4 calculates shift information of the conversion coefficient. The following processing uses a processing unit (program) that recognizes an input and generates an event, such as an OS graphics system. When detecting a meaningless input operation, the CPU 4 checks whether or not an object to be operated exists in the vicinity (step S12). CPU4
If there is an object to be operated in the vicinity, deviation information between the X coordinate and the Y coordinate is calculated from the conditional expressions shown in Table 2 below and stored in a memory or the like (step S13).
YES, S14). In Table 2, "0.1" included in the shift information means the reliability (xR, yR).

[0031]

[Table 2]

Specifically, the CPU 4 controls the touch panel 1
Touch panel coordinates (x
Screen coordinates (xc, yc) are obtained from T, yT) by a coordinate conversion process. The screen coordinates (xc, y
c) is compared with the display coordinates of the target object (for example, a button), and based on the comparison result, the shift information (X coordinate xN, Y coordinate yN) between the two ranges is calculated as the shift information of the conversion coefficient.

In the present embodiment, it is assumed that the calibration operation, that is, the conversion coefficient calculation processing is performed. In this calibration operation (see FIG. 13), even if the user's input instruction is not accurate, it can usually be assumed that the error range (shift amount) is about 5 mm. Therefore, the number of pixels corresponding to 5 mm on the screen is defined as xN and yN, respectively.
If the distance is within mm, the CPU 4 determines that the target object is present in the vicinity.

As described above, according to the present embodiment, the coordinate shift information after the conversion process is used by utilizing the meaningless input operation of the user and the coordinates of the target object such as the button displayed on the screen. Is calculated as conversion coefficient shift information. With such a method, the input operation range (operation range) of the touch panel 1 in the first embodiment described above.
The condition that 5 and the display range 6 of the screen 2 match is unnecessary. (Third Embodiment) Hereinafter, the operation of calculating the shift information related to the third embodiment will be described with reference to the flowchart of FIG. 6 and FIG.

In the present embodiment, when it is assumed that an operation target object such as a button exists at a predetermined position on the screen, the distribution of input positions (points) instructed to be input near the button is examined. When the distribution of the input positions is displaced from the display range (coordinates) of the button, a conversion coefficient deviation (calibration deviation) is estimated to have occurred.

According to this method, for example, as shown in FIG. 7, a system in which a button or the like as an operation target object is arranged at set positions 81 and 82 on the screen can be provided. Such a system has a function of arranging check boxes for deleting a window at the time of full screen execution (when the window is spread over the entire screen and executed) at the setting positions 81 and 82 on the screen.

Specifically, the CPU 4 controls the touch panel 1
Touch panel coordinates (x
Screen coordinates (xc, yc) are obtained from T, yT) by a coordinate conversion process. Next, it is checked whether or not the screen coordinates (xc, yc) corresponding to the input position are at or near a specific button (step S20). This criterion is the same as in the case of the above-described second embodiment. That is, the following formulas (9) and (1) are used with the number of pixels xN and yN corresponding to 5 mm on the screen as a reference range.
0).

[0038]

(Equation 7)

If the screen coordinates (xc, yc) corresponding to the input position are within the range of the specific button or its vicinity, the CPU 4 checks whether or not the specific button actually exists (step S23). . This is because the button may not always be present. Further, it is determined whether or not another button exists near the specific button (step S24). If there is no other button, the CPU 4 saves the screen coordinates (xc, yc) corresponding to the tapped input position (step S26). Then, when the stored data amount acquires a fixed amount, for example, 50 coordinate point data, the shift information of the conversion coefficient is calculated (YES in step S27, S2).
8).

Here, the shift information is obtained by using the above-mentioned Table 2 by the equations (9) and (10) and the following equations (11) to (1).
It is calculated by 4). The reliability of the shift information (xR
, YR) is not “0.1”, but here is “0.5”
And

[0041]

(Equation 8)

As described above, according to this embodiment, in a system in which a target object such as a button is arranged at a predetermined position on a screen, information on the deviation between the coordinates of the target object and the coordinates after the conversion processing is obtained. Is calculated as conversion coefficient shift information. With such a method, the condition that the input operation range (operation range) 5 of the touch panel 1 matches the display range 6 of the screen 2 is unnecessary as in the above-described second embodiment. (Method of Checking Validity of Shift Information) Here, a method of checking the validity of the shift information calculated in the first to third embodiments will be described with reference to FIG.

Here, description will be made focusing only on the X-coordinate conversion processing (see the above equation (3)). Equation (3)
FIG. 8 is a graph showing In FIG. 8,
The coordinate value range (11 in the operating range of the touch panel 1)
4) is at least in the range shown by the following equation (15).
The range is not narrowed any more.

[0044]

(Equation 9) Also, the range (113) of the screen coordinates (display range) obtained by the conversion coefficient calculation processing is expressed by the following equation (16).
It must be within the range shown in.

[0045]

(Equation 10) From the above relational expressions, the conversion coefficients a11, a13, a22, and a23 at the X coordinate and the Y coordinate can be expressed by the following equations (17) to (17).
The relationship shown in (20) is obtained.

[0046]

[Equation 11]

Therefore, the validity of the deviation information can be checked by judging whether or not the expressions (17) to (20) are satisfied. In FIG. 8, for example, as shown by a broken line (112), it is sufficient that the slope is steeper than the solid line (111) and the intersection with the Y axis is above. (Method of Correcting Transform Coefficient of First Embodiment) A method of correcting a transform coefficient according to the first embodiment will be described below with reference to FIG.

In the present embodiment, as described above, when the coordinate conversion processing is executed in response to the input instruction to the touch panel 1, the screen coordinates after the conversion processing are displayed on the screen 2
In this case, when the value deviates from the display range 6, the information on the shift of the conversion coefficient is calculated. That is, as shown in FIG. 9, this is the case where the transformed coordinates 61 are out of the range of the display range 6 of the screen 2 in the y direction by the shift amount d.

In such a case, the CPU 4 may correct the conversion coefficient as correction processing so that the Y coordinate after the conversion processing falls within the range from the range 121 to the range 122 shown in FIG. Specifically, it is assumed that the touch panel coordinates and the screen coordinates have a relationship as shown in the following equations (21) and (22).

[0050]

(Equation 12)

Using this equation (21) and the above-mentioned equation (3), it is possible to calculate the conversion coefficients a11, a13, a22 and a23 corrected as shown in the following equations (23) to (26). it can.

[0052]

(Equation 13) (Method of Correcting Transform Coefficients of Second and Third Embodiments) A method of correcting transform coefficients other than the above-described method will be described. In this correction method, a set of calculated shift information is obtained, and a conversion coefficient that most approximates the set is calculated. More specifically, the coordinate conversion processing from the touch panel coordinates to the screen coordinates is performed using the conversion coefficients obtained by the above-described equations (3) and (4). Here, the following equation (27),
Assume a set of shift information as shown in (28).

[0053]

[Equation 14]

Here, the reliability of the shift information (xR, yR)
Are used as shown in Table 3 below. However, in Table 3, the detection methods 1 to 3 correspond to the shift information calculation methods in the first to third embodiments, respectively.

[0055]

[Table 3]

At this time, the calculated conversion coefficient is set to an appropriate conversion coefficient so that the above-mentioned equations (3) and (4) are most approximated to the set of shift information as shown in the above-mentioned equations (27) and (28). Becomes Here, FIG. 10 is a diagram showing a state in which a correction value for the X coordinate is obtained. In FIG. 10, the vertical axis indicates screen coordinates (coordinates after coordinate conversion processing) Xs, and the horizontal axis indicates touch panel coordinates (coordinates before coordinate conversion processing) Xt. The plots indicated by “X” are obtained by the equations (27) and (28).
Means a set of shift information indicated by.

In this method, it is assumed that the conversion coefficients are calculated by the least square method after weighting based on the reliability. Specifically, with respect to the above equation (3),
In the following equation (29), the conversion coefficients a11 and a13 that minimize the shift amount d may be calculated.

[0058]

(Equation 15) (Modification of Second Embodiment) The method of the second embodiment is as follows.
If the user's input operation on the touch panel 1 is a meaningless operation, it is estimated that the conversion coefficient is shifted. However, the present embodiment is based on the premise that a processing unit (program) that recognizes an input and generates an event, such as a graphics system of an OS, is used. Therefore, when the graphics system of the OS cannot be used, the application is not applicable.

Therefore, in this modification, the method shown in the flowchart of FIG. 6 is executed by applying the method of the third embodiment described above and focusing on the button located at a predetermined position on the screen. This is a method for obtaining the deviation information shown in Table 2 above.

Note that the neighborhood determination shown in step S20 is based on the contents of Table 2 described above, using the number of pixels xN and yN corresponding to 5 mm on the screen as a reference range, as described in the third embodiment. It is executed using.
Further, in the processing of step S22, if the button is not always present, the bitmap at that position is checked or it is checked whether or not the button is present by using information possessed by the display driver. Further, in step S24, it is determined whether or not another button exists near the specific button. This means that, for example, when the button is kept pressed and a menu appears, it is possible to recognize the presence or absence of the menu by examining the bitmap of the button. In the case where the position of the adjacent button is fixed, it is possible to check whether or not another button is present by checking the bit map at that position (using information held by the display driver). May be used).

In the above-described conversion coefficient correction method, instead of a method in which the system automatically executes the conversion coefficient correction processing based on the deviation information, the system recalculates the user after calculating the deviation information. A method of prompting (resetting the conversion coefficient) may be used. Specifically, a display for notifying a request for re-calibration is displayed on the screen 2. Further, in each of the above-described embodiments, the time information may be added to the shift information, and the shift information may be deleted after a predetermined time has elapsed. This makes it possible to automatically re-execute the calibration process even when a shift in calibration occurs due to a change in hardware characteristics of the touch panel 1 over time.

The present invention is premised on application to a data input device such as a PDA, but can also be applied to a joystick calibration process in a video game, for example. In the joystick calibration process, it is required to tilt the stick to the upper right and lower left and press a button. Some software requires you to push the button back to the center after tilting the stick to the upper right and lower left. When the present invention is applied, automatic calibration correction processing can be performed using the operation contents of the user's stick during the game.

[0063]

As described above in detail, according to the present invention, based on a user's input instruction on the touch panel, the shift information of the conversion coefficient (calibration) used for performing the coordinate conversion from the touch panel coordinates to the screen coordinates is obtained. Can be calculated. Therefore, based on the calculated shift information, the shift of the conversion coefficient (calibration) is automatically corrected, and an appropriate conversion coefficient can always be obtained. In this case, when the user's input instruction is not accurate during the calibration process, or when the conversion coefficient is shifted due to a change in the hardware characteristics of the touch panel with the passage of time, the appropriate conversion coefficient is obtained. Based on this, accurate coordinate conversion processing can always be realized.

[Brief description of the drawings]

FIG. 1 is a flowchart for explaining the operation of the first embodiment of the present invention.

FIG. 2 is a block diagram showing a main part of the touch panel data input device according to the first embodiment;

FIG. 3 is a conceptual diagram for explaining the operation of the first embodiment.

FIG. 4 is a conceptual diagram for explaining the operation of the first embodiment.

FIG. 5 is a flowchart for explaining the operation of the second embodiment.

FIG. 6 is a flowchart for explaining the operation of the third embodiment.

FIG. 7 is a conceptual diagram for explaining the operation of the third embodiment.

FIG. 8 is a view for explaining a method of checking the validity of the shift information calculated in each of the first to third embodiments.

FIG. 9 is a view for explaining a method of correcting a conversion coefficient according to the first embodiment.

FIG. 10 is a diagram for explaining a method of correcting a conversion coefficient according to the second and third embodiments.

FIG. 11 is a diagram showing a main part of a conventional touch panel type data input device.

FIG. 12 is a view for explaining processing steps of a conventional calibration function.

FIG. 13 is a flowchart for explaining processing steps of a conventional calibration function.

FIG. 14 is a diagram for explaining a problem of a conventional calibration function.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Touch panel 2 ... Screen 3 ... A / D converter 4 ... CPU 5 ... Operating range (operating range) of a touch panel 6 ... Display range of a screen

Claims (13)

[Claims] 1. A data input device for performing a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface with a screen constituting a display screen. A first calculating unit that calculates a conversion coefficient required for a coordinate conversion process from a touch panel coordinate value corresponding to an input instruction to the touch panel to a screen coordinate value of the screen; A data input comprising: second calculating means for calculating shift information of a conversion coefficient; and correcting means for correcting the conversion coefficient based on the shift information calculated by the second calculating means. apparatus. 2. A data input device which performs a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. A coordinate conversion method, comprising: a coordinate conversion unit configured to calculate a conversion coefficient necessary for a coordinate conversion process from a touch panel coordinate value corresponding to an input instruction to the touch panel to a screen coordinate value of the screen; Performing a process of calculating deviation information of the conversion coefficient in response to an input instruction to the touch panel, and correcting the conversion coefficient based on the deviation information. Method. 3. The data input device according to claim 1, further comprising means for executing a notification process requesting a correction process of the conversion coefficient on the screen at a time when the shift information is calculated. Item 2. The coordinate conversion method according to Item 2. 4. A data input device for performing a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. The input operation range of the touch panel is the same as the display range of the screen, and is necessary for coordinate conversion processing from touch panel coordinate values corresponding to input instructions to the touch panel to screen coordinate values of the screen. First calculating means for calculating a conversion coefficient; and determining whether or not the screen coordinate value obtained by the coordinate conversion processing in accordance with an input instruction to the touch panel is included in a display range of the screen. Means for displaying the screen when the screen coordinate value is outside the display range of the screen. Second calculating means for calculating shift information of the conversion coefficient corresponding to a shift amount from a predetermined reference position within the range; and calculating the conversion coefficient based on the shift information calculated by the second calculating means. A data input device comprising: a correction unit for performing correction. 5. A data input device which performs a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. A coordinate conversion method, wherein an input operation range of the touch panel and a display range of the screen match, and a touch panel coordinate value corresponding to an input instruction to the touch panel is converted to a screen coordinate value of the screen. A coordinate conversion unit for calculating a conversion coefficient required for the coordinate conversion process, wherein the coordinate conversion unit displays the screen coordinate value obtained by the coordinate conversion process in response to an input instruction to the touch panel on the screen. Determining whether or not the screen coordinates are included in the range; Calculating the shift information of the conversion coefficient corresponding to the shift amount from a predetermined reference position within the display range of the screen when out of the display range of the lean; and correcting the conversion coefficient based on the shift information. Performing a process comprising the steps of: 6. A data input device for performing a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. Means for detecting an input operation unrelated to the execution of a program when an input instruction is given on the touch panel; and a coordinate conversion process from a touch panel coordinate value corresponding to the input instruction to the touch panel to a screen coordinate value of the screen. A first calculating means for calculating a conversion coefficient necessary for the operation, and comparing the screen coordinate range obtained by the coordinate conversion processing with the coordinate range of the operation target object existing near the screen coordinate range. A second calculating means for calculating the range shift information; and a second calculating means for calculating the range shift information. A third calculating unit that calculates the shift information as shift information of the conversion coefficient; and a correcting unit that corrects the conversion coefficient based on the shift information calculated by the third calculating unit. Characteristic data input device. 7. The present invention is applied to a data input device that performs a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. A coordinate conversion method, comprising: a coordinate conversion unit that calculates a conversion coefficient required for a coordinate conversion process from a touch panel coordinate value corresponding to an input instruction to the touch panel to a screen coordinate value of the screen; Comparing the screen coordinate range obtained by the coordinate conversion process with the coordinate range of the operation target object existing in the vicinity of the screen coordinate range, and calculating shift information between the two ranges. Calculating the shift information as shift information of the conversion coefficient; and Coordinate transformation method characterized by performing a process comprising the step of correcting the transform coefficients Te. 8. A data input device which performs a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. A first calculating unit that calculates a conversion coefficient required for a coordinate conversion process from a touch panel coordinate value corresponding to an input instruction to the touch panel to a screen coordinate value of the screen, and an operation target object to be displayed on the screen. A second calculating unit that compares a coordinate range and the screen coordinate range obtained by the coordinate conversion process to calculate shift information between the two ranges; and calculates the shift information calculated by the second calculating unit. A third calculating means for calculating as conversion coefficient shift information; Data input device being characterized in that; and a correcting means for correcting the transform coefficients on the basis of the information. 9. A data input device which performs a data input operation based on input coordinates obtained by inputting an instruction on the touch panel by combining a touch panel constituting an input instruction surface and a screen constituting a display screen. A coordinate conversion method, comprising: a coordinate conversion unit that calculates a conversion coefficient required for a coordinate conversion process from a touch panel coordinate value corresponding to an input instruction to the touch panel to a screen coordinate value of the screen; Comparing the coordinate range of the operation target object to be displayed on the screen with the screen coordinate range obtained by the coordinate conversion process to calculate shift information between the two ranges; and calculating the calculated shift information. Calculating the shift information of the conversion coefficient; and determining the conversion factor based on the shift information. Coordinate transformation method characterized by performing a process comprising the step of correcting the. 10. The correction means generates a set of sets of the touch panel coordinate values and the screen coordinate values, calculates a conversion coefficient approximating the set by a method such as regression analysis, and calculates the calculation result. 9. The data input device according to claim 1, further comprising means for outputting a correction result of the conversion coefficient. 11. The image processing apparatus according to claim 1, wherein the correction means includes means for independently calculating a conversion coefficient for the X coordinate and a conversion coefficient for the Y coordinate when outputting the calculation result as a correction result of the conversion coefficient. 11. The data input device according to claim 10, wherein 12. The correction means generates a set of sets of the touch panel coordinate values and the screen coordinate values, weights the sets according to the reliability of each set, and then converts a conversion coefficient approximating the set. 12. The data input device according to claim 10, further comprising means for calculating by a method such as regression analysis. 13. The correction means determines whether or not a screen coordinate value, which is a coordinate conversion result, is included in a display range of a screen with respect to a value range of touch panel coordinates input in the past. 12. The data input device according to claim 10, further comprising: means for correcting a conversion coefficient with respect to the touch panel coordinates so that the screen coordinate value falls within the display range of the screen when n is negative.