JPH10133808A - Method for automatically correcting input position for digitizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic input position correcting method correctly correcting the information for transforming input coordinates of a digitizer into coordinates on a screen without finger-touch input by an operator. SOLUTION: In this method for automatic correction, a digitizer 8 is made to come into contact with a contact part 5, and at the time of contact, points are displayed on the screen 9 one by one, and the position of a point on the screen 9, which is detected as the most bright by a light detecting part 7, is measured. Thus obtained respective coordinates of the digitizer and on the screen are measured for two points, and a correcting value to correct the input coordinates to the digitizer 8 into the coordinate on the screen 9 is calculated. Thus, an arbitrary point on the digitizer which is entered by the operator thereafter is automatically transformed into the screen coordinates.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a graphic input device, and more particularly to a method for determining coordinates of points on a digitizer in a device in which a screen and a digitizer are pasted together.

[0002]

2. Description of the Related Art A digitizer arranges drawings on a flat plate,
This is a graphic input device for inputting graphic data on a drawing to a computer by tracing a graphic with a pointing unit such as a cursor or a stylus pen.

As a prior art of this digitizer position correction method, for example, Japanese Patent Application Laid-Open No. Hei 6-289980 discloses a reference diagram in which a plurality of reference points are written as shown in FIG.
Is attached to the digitizer 1 (step S1), and the pointing device 7
(Step S2), the coordinates of the input reference points are normalized, and the displacement between the normalized coordinates and the coordinates of each reference point in the reference diagram is calculated. Is calculated (Step S3), a correction parameter of the digitizer is calculated using the affine transformation for this displacement (Step S4), and a standard error of the displacement before and after the correction is calculated by the correction parameter (Step S5). A proposed method has been proposed. In this method, a reference diagram indicating the position where a finger is input is attached to a digitizer, and a plurality of points are input by an operator using a pointing tool of the digitizer, and the displacement between the points is calculated. Is used to correct the coordinate positions of the digitizer and the screen.

Japanese Patent Laid-Open Publication No. Hei 2-193214 proposes a method having a function for an operator to input two specific points of a digitizer with a finger. In this method, an operator corrects a shift between the digitizer and the screen by inputting a finger to two points on a specific screen.

[0005]

The above-described prior art has the following problems.

(1) The first problem is that the operator needs to input a finger when correcting the displacement between the digitizer and the screen.

The reason is that, in the above-mentioned prior art, the coordinates of the points of the digitizer corresponding to the coordinates of the points on the screen are different from each other due to a shift generated when the bonding is performed, a manufacturing process, and a distortion of the heat / digitizer. And correction is required for each device.

(2) The second problem is that correction is not always performed accurately due to an erroneous operation of the operator.
That's what it means.

The reason is that, in the above-described conventional technology, the position where the operator visually touches and inputs a finger with respect to the coordinates of a point on the screen is treated as correction information.

Therefore, the present invention has been made in view of the above-mentioned problems, and has as its object to always obtain accurate correction information, eliminate the need for an operator to input a finger, and improve reliability and reliability. It is an object of the present invention to provide a digitizer input position automatic correction method that improves operability.

[0011]

In order to achieve the above object, a method for correcting an input position of a digitizer according to the present invention comprises the steps of: providing a digitizer attached to a screen for emitting light; When the tip of the contact portion contacts the digitizer, the coordinates of the corresponding contact point on the digitizer are obtained, and the points on the screen are sequentially lit to detect the brightest point on the screen. Obtaining the coordinates of a point, measuring the coordinates of the digitizer and the coordinates on the screen obtained in this way for at least two points, and calculating a correction value for correcting the input coordinates to the digitizer to the coordinates of the screen, It is characterized by the following.

Further, according to the present invention, when the power is turned on, the tip of the contact portion is brought into contact with the digitizer to control the calculation of the correction value.

[0013]

Embodiments of the present invention will be described below. The present invention, in a preferred embodiment thereof, makes it possible to determine a correction value for calculating the coordinates of the screen, which corresponds to the coordinates of the digitizer without fingertip input by the operator. When a power switch (1 in FIG. 1) of the device is turned on, a contact section (5 in FIG. 1) that contacts the digitizer, a contact operation section (3 and 4 in FIG. 1) for operating the contact section, It has a light detection unit (7 in FIG. 1) for detecting the brightness of the screen display, and a display control unit (10 in FIG. 1) for displaying points on the screen.

[0014] When the power switch of the apparatus is turned on, the contact operation section lowers the contact section in the vertical direction until the touched coordinates can be detected from the digitizer. When the touched coordinates are detected by the digitizer, the display control unit sequentially turns on / off all the points on the screen, and determines the coordinates on the screen where the light detection unit detects the value with the largest light quantity. Measure.

By performing this at two different points on the screen, a correction value for calculating coordinates on the screen corresponding to coordinates on the digitizer can be calculated.

For this reason, the person who uses the digitizer can use the digitizer without correcting the difference between the coordinates of the digitizer and the coordinates of the screen.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention;

FIG. 1 is a diagram showing the configuration of one embodiment of the present invention. Referring to FIG. 1, one embodiment of the present invention includes a control unit 2 connected to a power switch 1 of the apparatus, and a contact operation unit 3 for moving the contact units 5, 5 'in the vertical direction under the control of the control unit 2. (4), light detection units 7 and 7 'provided in the contact units 5 and 5' for detecting light emitted from the screen 9, a display control unit 10 for the screen 9, and detection by the light detection units 7 and 7 ' A determination unit 11 for determining the maximum value of the obtained light amount, a calculation unit 12 for calculating the coordinates of the screen 9 and the digitizer 8 are provided.

FIG. 2 is an enlarged view showing the operation of the contact portion in one embodiment of the present invention. As shown in FIG. 2A, a light detection unit 7 is provided inside the contact unit 5, and the light detection unit 7 is provided with a thin transparent region (light guide unit) from the opening at the tip of the contact unit 5. ) The incident light from the screen 9 is detected through 6. FIG. 2B shows an output 18 of the input coordinates to the digitizer when the tip of the contact portion 5 comes into contact with the digitizer 8, and FIG. Shows a state in which incident light from the screen 9 is input.

FIG. 3 is a flowchart for explaining the operation of one embodiment of the present invention. Next, the operation of the embodiment of the present invention will be described in detail with reference to FIG. 1, FIG. 2 and FIG.

First, when the power switch 1 of the apparatus is turned on (step 20), the control unit 2 controls the contact operation unit 3 to lower the contact unit 5 until the tip of the contact unit 5 contacts the digitizer 8 (step 21). ).

When the tip of the contact portion 5 contacts the digitizer 8 (Yes in step 23), the digitizer outputs the coordinates of the digitizer 8 contacting the contact portion 5 (see 18 in FIG. 2B) (step 23). 23).

When the coordinates of the contact position of the tip of the contact portion 5 can be obtained by the digitizer 8, the display control unit 10 lights the point of the thinnest display unit on the screen 9 (step 24). ).

Each point on the screen 9 is turned on one by one, and the light amount is detected by the light detector 7 in the contact portion 5 for each point (step 25, see FIG. 2C).

When all the points on the screen 9 are turned on, the discriminating section 1
At 1, the coordinates of the screen 9 at which the maximum light amount value is measured are determined (step 28).

After the coordinates are determined, the contact portion 5 is raised vertically to a position where the tip does not contact the digitizer 8 (step 29).

The coordinates of the screen 9 obtained in this way are the ones in which the distance between the light detection unit 7 and the screen 9 is the shortest. This corresponds to the point having the shortest distance from the screen 9 measured by the upper light detection unit 7.

The coordinates corresponding to the digitizer 8 and the screen 9 are detected twice by the contact portion 5 (the contact portions 5 and 5 'in FIG. 1).

Based on the result obtained in this way, the position of the finger input to the digitizer 8 by the operator is calculated by the calculation unit 12.
Is uniquely determined using the correction value for converting the input coordinates of the digitizer 8 calculated in the above into the coordinates of the screen 9.

Next, a second embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG.

In the system shown in FIG.
Is turned on, the control unit 2 notifies the control operation unit 3 to lower the contact unit 5 in the vertical direction little by little.

When the tip of the contact portion 5 contacts the digitizer 8 (see FIG. 2B), the digitizer 8 outputs the contact coordinates.

When the contact coordinates are detected, the display controller 10 turns on and turns off points on the screen 9 one by one, and the light detector 7 detects the light amount corresponding to each point on the screen 9. Among the detected light amounts, the coordinates of the point on the screen 9 where the light amount is large (detected as the brightest by the light detection unit 7) are determined.

Two points are measured for the contact coordinates of the digitizer 8 and the brightest coordinates of the screen 9 measured from the contact position. The obtained contact coordinates of the digitizer 8 are represented by (X
A, YA), (XB, YB), and the brightest coordinates of the screen 9 obtained by the photodetector 7 are (XDA, YDA), (X
DB, YDB). A correction argument is calculated from the information of these two points.

The coordinates (A, B) of the digitizer 8 pointed by the operator and
The coordinates (X, Y) of the screen 9 corresponding to the digitizer coordinates touched are derived by the following equation (1).

[0036]

The following (XDB-XDA) / (XB-XA)
Is the X-axis correction argument, (YDB-YDA) / (YB-Y
A) is called a Y-axis correction argument.

As described above, the correction information of the digitizer 8 and the screen 9 can be obtained without any artificial correction processing.

Further, as a modified example of the embodiment, when the contact coordinates are detected n times (n> = 2) in step 30 in FIG. 3, n digitizer coordinates and screen coordinates can be respectively detected.

When any two points are selected from n and the correction argument is calculated, (n-1)! A set of correction arguments is derived. Each correction argument should be the same no matter which two points are selected, but if the resolution of the digitizer is smaller than the resolution of the screen, the values may not be equal.

In this case, the average value of each correction argument is derived by dividing the obtained sum of the correction arguments by (n-1). Thereby, a more accurate correction argument can be obtained as compared with the case of two points.

[0042]

As described above, according to the present invention,
The following effects are obtained.

(1) The first effect of the present invention is that an argument for correction from the coordinates of the digitizer to the coordinates of the screen can be obtained without the operator's fingertip inspection. Thereby, the work of the operator can be made more efficient.

The reason is that, in the present invention, the coordinate correction between the digitizer and the screen is performed automatically without any processing by the operator.

(2) A second effect of the present invention is that a correction argument from the digitizer coordinates to the screen coordinates can be obtained more accurately. Thereby, the coordinates of the screen corresponding to the coordinates of the digitizer can be determined more accurately.

The reason is that, in the present invention, the correction from the digitizer coordinates to the screen coordinates is performed mechanically without the intervention of the operator, so that human input errors can be avoided. is there.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a contact portion for explaining one embodiment of the present invention.

FIG. 3 is a flowchart for explaining the operation of the embodiment of the present invention.

FIG. 4 is a flowchart showing a conventional method of correcting digitizer coordinates and coordinates on a screen.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power switch 2 Control part 3 Contact operation part 4 Contact operation part 5 Contact part 6 Transparent area from the tip to the light detection part inside the contact part 7 Light detection part 8 Digitizer 9 Screen 10 Display control part 11 Discrimination part 12 Calculation part 18 Output of input coordinates to digitizer 19 Incident light from screen 20-31 Flow chart showing actual operation of the present invention

Claims (3)

[Claims] 1. A contact portion provided with a light detecting means is brought into contact with a digitizer attached to a screen which emits light, and when the tip of the contact portion comes into contact with the digitizer, a digitizer of the contact is provided. Along with obtaining the coordinates on the screen, the points on the screen are sequentially lit to obtain the coordinates of the points on the screen that are detected as the brightest, and the coordinates of the digitizer and the coordinates on the screen obtained in this way are: A method for automatically correcting an input position of a digitizer, comprising: measuring at least two points; and calculating a correction value for correcting input coordinates to the digitizer to coordinates on the screen. 2. The input of the digitizer according to claim 1, wherein when the power supply is started, the tip of the contact portion is brought into contact with the digitizer to calculate the correction value. Automatic position correction method. 3. A means for detecting light emitted from a screen having a backlight, and means for detecting a coordinate position to which a fingertip input is applied, wherein power supply to a digitizer attached to the screen is started. The input means operating only on the digitizer, and calculating the input value from the input means and the coordinates of a point on the screen from the detecting means on the digitizer corresponding to the coordinates of an arbitrary point on the screen. A method for automatically correcting the input position of a digitizer, wherein the coordinates of a point are determined.