JPH05324163A - Device and mehtod for detecting coordinate - Google Patents

Abstract

PURPOSE:To provide a coordinate detecting device and a coordinate detecting method capable of minimizing the influence of a noise or the like at the time of detecting coordinates and detecting a more accurate coordinate value. CONSTITUTION:The coordinate detecting device constituted of a pen input device 10 using resistor film sheets 1, 2 and an arithmetic means 5 for computing the coordinate value of a pen (3) depressing position from the output of the means 10 is provided with a means 20 for sampling the coordinate value of the pen depressing position plural times and a storage means 30 for storing plural pieces of sampled data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coordinate detecting device and a coordinate detecting method, and more particularly to a coordinate detecting device and a coordinate detecting method using a pen input means using a resistance film sheet. .

[0002]

2. Description of the Related Art In recent years, computers have become smaller, faster, and have larger capacities, and the need for coordinate input devices that do not require a dedicated operator has increased accordingly. In addition, there is a demand for a coordinate detection device that uses a pen input system at a low cost. By the way, in the past,
A coordinate detecting device having a pen input means using a resistance film sheet is used, and the pen input means 10 has a resistance film sheet 1 for X coordinate detection and a Y coordinate as shown in FIG. The resistance film sheet 2 for detection and the position specification pen 3 are provided, and each of the resistance film sheet 1 for X coordinate detection and the resistance film sheet 2 for Y coordinate detection is provided in the switching circuit 4. In addition, it is connected to a switch means composed of, for example, a transistor.

That is, the resistance film sheet 1 for detecting the X coordinate is
The resistance film sheet 2 for detecting the Y-coordinate is provided between the transistors Tr1 and Tr2 provided in the switching circuit 4, and the resistance film sheet 2 for detecting the Y coordinate is provided between the transistors Tr3 and Tr4 provided in the switching circuit 4. It is connected. And
When the X coordinate is detected, the transistors Tr1 and Tr2 are turned on based on a control signal generated from a control circuit 9 provided in a control means 5 composed of a computer, which will be described later. The potential between the resistance film sheets is detected by the potential detecting means 6.

Further, the transistors Tr3 and Tr4 are provided with a control signal generated from a control circuit 9 provided in the control means 5 at the time of detecting the Y coordinate, which is preferably performed alternately at a phase different from the X coordinate detecting timing. Based on the
Meanwhile, the potential between the resistance film sheets for detecting the Y coordinate is detected by the potential detecting means 7. Next, the potential between the position where the position-designating pen is pressed and the one end of the resistance film sheet 1 for detecting the X-coordinate is adjusted to the position where the position-designating pen is pressed and the Y-coordinate detecting position. The potential between one end of the resistance film sheet 2 and the potential detection means 6 and 7 are alternately measured by the control signal from the control means, and from the result, the coordinates provided in the control means 5 are measured. In the position determining means 8, the X coordinate and the Y coordinate of the position where the position specifying pen is pressed are determined by the control means, and the information is supplied to the circuit of the next stage.

In such a conventional coordinate detecting device,
Since noise generated by various factors affects the power supply line, an error occurs in the coordinate value detected due to a minute potential difference, so there is a problem that it is difficult to output an accurate coordinate value. ing. Therefore, for example, when trying to draw a character or a line using the pen in the pen input means, the line segment does not become a clean straight line but becomes a jagged line, and the character etc. is recognized by a predetermined character recognition means. There was a problem in that even if it was attempted to be recognized, it would be erroneously recognized.

That is, in the above-mentioned conventional coordinate detecting device, as shown in FIG. 4, by switching the switching circuit 4 by the control signal output from the control circuit 9 of the control means 5, X The coordinate detection circuit and the Y coordinate detection circuit are alternately switched to measure the coordinate value of the position of the pen input means where the position specifying pen is pressed, and the waveform 11 shows the X coordinate value. The waveform 12 shows the X-coordinate potential for detection, and the waveform 12 shows the Y-coordinate potential for detecting the Y-coordinate value, and the operation is repeatedly and continuously executed.

Incidentally, in FIG. 4, the period indicated by 13 indicates the time required for the calculation of the detected coordinate data and the data transfer of the result. However,
In such a conventional coordinate detecting device, as described above, noise or the like is mixed during the detection of each coordinate value, and the detected waveform fluctuates as shown in FIG.

Therefore, in the normal period t1 or t2 required for the X coordinate detection or the Y coordinate detection, when the detection operation is completed once, the coordinate value data including the noise is detected. There is a risk that the wrong coordinate values will be output in that case, and there will be a risk that necessary characters will be displayed as wrong characters.

[0009]

SUMMARY OF THE INVENTION The object of the present invention is to improve the drawbacks of the prior art, to minimize the influence of noise and the like during coordinate detection, and at the same time to detect a more accurate coordinate value. A coordinate detection device and a coordinate detection method are provided.

[0010]

The present invention adopts the following technical constitution in order to achieve the above-mentioned object. That is, in a coordinate detecting device composed of a pen input means using a resistance film sheet and a calculating means for calculating the coordinate value of the pen pressing position from the output from the pen input means, one pen pressing position When calculating the coordinate value of the coordinate detecting device, a coordinate detecting device further comprising: a means for sampling the coordinate value of the pen pressing position a plurality of times; and a storage means for storing the plurality of sampled data. In the coordinate detecting device according to the first aspect, the pen input means using a resistance film sheet and the arithmetic means for calculating the coordinate value of the pen pressing position from the output from the pen input means Of sampling the data relating to the coordinate value of the pen pressing position output by the pressing operation of the plural times, the first sampling data based on the sampling data of the plural times.
Of the sampling data for the plurality of times with respect to the first average value, and excluding the sampling data having a predetermined variation or more, a second average value from the remaining sampling data. A second aspect of the present invention is a coordinate detection method, which comprises a step of calculating and determining the result as the coordinate value of the pen pressing position.

[0011]

Since the coordinate detecting device and the coordinate detecting method according to the present invention employ the above-mentioned technical configuration, data regarding an abnormal coordinate value generated by noise or the like is removed from the necessary coordinate value calculation data. Since the arithmetic processing is executed and the average value is obtained by handling only the data regarding the coordinate value which is not affected by noise or the like, it is possible to obtain the extremely accurate coordinate value.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of a coordinate detecting device and a coordinate detecting method according to the present invention will be described below with reference to the drawings.
FIG. 1 is a diagram for explaining the configuration of a specific example of the coordinate detecting device according to the present invention. In the figure, a pen input means 10 using resistive film sheets 1 and 2 and an output from the pen input means 10 In the coordinate detecting device including the calculating means 5 for calculating the coordinate value of the pressed position of the pen 3, when calculating the coordinate value of one of the pressed position of the pen, the coordinate value of the pressed position of the pen is set to plural values. The coordinate detection apparatus is further provided with a means 20 for sampling once and a storage means 30 for storing the plurality of sampled data.

Further, in the coordinate detecting apparatus according to the present invention, the calculating means 5 has a first value relating to the coordinate value of the pen pressing position from a plurality of data stored in the storage means 30. Means 31 for calculating an average value, means 32 for comparing the first average value with a plurality of data stored in the storage means 30, and a plurality of data stored in the storage means 30 From the inside, means 35 for excluding data having a deviation of a predetermined value or more from the first average value from the storage means 30 and a second average value from a plurality of data remaining in the storage means 30. Means 34 for calculating and outputting the coordinate value of the pen pressing position is preferably provided.

Further, the resistive film sheet, pen input means, coordinate value calculation means, etc. in the coordinate detecting device according to the present invention are not particularly limited, and conventionally known circuits can be used. The characteristic feature of the present invention is that, as described above, when calculating the coordinate value of one pen pressing position,
A means 20 for sampling the coordinate value of the pen-pressed position a plurality of times is provided, which allows the conventional coordinate detection device to calculate the coordinate value of one pen-pressed position and specify it. 4 or FIG. 5, the detection operation is performed only once within the X-coordinate detection or Y-coordinate detection times t1 and t2, whereas it is repeatedly sampled a plurality of times, for example, 20 times within the detection times t1 and t2. By performing an operation, a plurality of X coordinate detection values and Y coordinate detection values corresponding to each are obtained.

Therefore, according to the present invention, a plurality of pieces of information regarding the coordinate values of one pen pressing position are obtained, and abnormal detection data is excluded from the pieces of information, and accurate information is obtained based on a plurality of pieces of normal information. The X coordinate value and the Y coordinate value are calculated. That is, in the present invention, in the conventional coordinate detection operation, there is a danger that an accurate coordinate value cannot be obtained due to the inclusion of noise or the like, whereas the coordinate value including noise is included. However, more accurate coordinate values can be obtained from multiple pieces of information.

In the present invention, as described above, the control circuit is first based on the command of the sampling means 20 in the control means 5 so as to obtain a plurality of information regarding the coordinate value of one pen pressing position. 9 is operated to repeat the X coordinate detection operation and the Y coordinate detection operation a plurality of times within the X coordinate detection or Y coordinate detection times t1 and t2, respectively, and a plurality of X coordinate detection values obtained thereby are obtained. It is preferable to provide the first storage circuit 30 for separately storing the Y-coordinate detection value and the Y-coordinate detection value in the calculation means 5.

Next, in the present invention, the first X-coordinate value related to each of the plurality of X-coordinate detection data and the plurality of Y-coordinate detection data stored in the first storage means 30 is used. The first average value calculating means 31 for calculating the first average value for calculating the first average value regarding the Y coordinate value is provided as well as calculating the average value for. Then, when each first average value regarding the X coordinate value and the Y coordinate value is obtained,
The first average value is temporarily stored and stored in the second storage means 32 which is an appropriate storage means.

In this case, the first and second storage means 30 and 32 may be provided separately, or they are the same storage means and each of the stored individual information is stored. A memory circuit configured to have different addresses may be used. Next, in the present invention, the first storage means 3
The plurality of X coordinate detection data and the plurality of Y coordinate detection data stored in 0 are compared with the first average value, and the first average value and the predetermined deviation are determined. The deviation determining means 33 for comparing and judging whether or not it is provided is provided, and the coordinate detection value determined to have a predetermined deviation by the deviation determining means 33 is recognized as abnormal data including noise. However, it is excluded from the target information of the subsequent arithmetic processing.

Therefore, in the present invention, the deviation determination means 33 causes the detection data having a deviation value equal to or more than a predetermined value with respect to the first average value to be stored in the first storage. It is preferable to provide data excluding means 34 for executing the action of deleting from the means 30. In the present invention, as described above, the remaining data obtained by excluding abnormal data including noise from the coordinate value detection data stored in the first storage means 30 is reused. , A second average value calculating means 35 for determining each second average value of the X coordinate value and the Y coordinate value.

That is, in the present invention, even when noise is added to the coordinate value detection data, the extreme abnormality detection data is omitted and the remaining data is averaged to calculate an effective coordinate value. Therefore, even if the detected data relating to each actual coordinate value includes a large number of abnormal coordinate value detected data as shown in FIG. 5, both of them are close to the ideal as shown in FIG. Since we can get the coordinate value data,
It is possible to prevent erroneous operation and erroneous determination of characters and the like.

The operation procedure of the above-described coordinate detecting apparatus according to the present invention will be described with reference to the flowchart of FIG. First,
After the start, in step (1), the X coordinate potential and the Y coordinate potential representing the X coordinate and Y coordinate of the pen pressing position by the pen input means are sampled, and the process proceeds to step (2) to obtain The X-coordinate potential and the Y-coordinate potential thus obtained are converted into digital values using an analog / digital converter, and the values are stored in appropriate addresses in the first storage means 30.

In step (3), it is judged whether or not the sampling N number of times has been repeated a predetermined number of times, and if N times sampling has not been performed (in the case of NO) step ( Returning to 1), the above steps are repeated, but when sampling is performed N times (in the case of YES), the process proceeds to step (4), where the X coordinate value and Y
A first average value is calculated for each of the coordinate values.

Next, in step (5), the N X coordinate detection data stored in the storage means 30 are compared with the first average value relating to the X coordinate values, and the deviation is preset. If the deviation exceeds a predetermined value, it is determined whether or not the difference is within a predetermined value or exceeds a preset value (step (6)). The X coordinate detection data is regarded as abnormal data including noise and is removed from the storage unit 30.

Regarding the Y-coordinate detection data, the abnormal Y-coordinate detection data is removed from the field through the steps (4) to (7). In step (8), it is judged whether or not the process of steps (4) to (7) has been performed N times for each X coordinate detection data and Y coordinate detection data. (Step (8)) If NO, the above steps (4) to (7) are repeated, and if YES, the process proceeds to Step (9) and the sampling data value left in the storage means 30. Is used to calculate and calculate a second average value regarding the X coordinate value and the Y coordinate value, and this is determined as the valid X coordinate value and Y coordinate value regarding the position pressed by the pen input means. is there.

[0025]

EFFECT OF THE INVENTION Data relating to an abnormal coordinate value generated by noise or the like is removed from necessary coordinate value calculation data,
Since the arithmetic processing is executed and the average value is obtained by handling only the data relating to the coordinate values that are not affected by noise or the like, it is possible to obtain extremely accurate coordinate values.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a specific example of a coordinate detection device according to the present invention.

FIG. 2 is a flow chart showing an example of an operation procedure when a coordinate value is calculated using the coordinate detection device according to the present invention.

FIG. 3 is a block diagram showing a configuration example of a conventional coordinate detection device.

FIG. 4 is a diagram showing detection waveforms of ideal X coordinate values and Y coordinate values.

FIG. 5 is a diagram showing detection waveforms of an X coordinate value and a Y coordinate value in a conventional coordinate detecting device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Resistive film sheet 2 ... Resistive film sheet 3 ... Position designation pen 4 ... Switching means 5 ... Calculation control means 6 ... Potential detection means 7 ... Potential detection means 8 ... Coordinate position determination means 9 ... Control circuit 10 ... Coordinate detection device 11 ... X coordinate detection potential waveform 12 ... Y coordinate detection potential waveform 13 ... Coordinate value calculation and data transfer time 20 ... Repeated sampling instruction means 30 ... First storage means 31 ... First average value calculation means 32 ... First Mean value storage means 33 ... Means for comparing first average value and detected data 34 ... Detection data excluding means 35 ... Second average value calculating means

Claims (3)

[Claims] 1. A coordinate detecting device comprising: a pen input means using a resistance film sheet; and a computing means for computing a coordinate value of the pen pressing position from an output from the pen input means. When calculating the coordinate value of the pen pressing position, means for sampling the coordinate value of the pen pressing position a plurality of times and storage means for storing the plurality of sampled data are further provided. Characteristic coordinate detection device. 2. The calculating means includes means for calculating a first average value of coordinate values of the pen pressing position from a plurality of data stored in the storage means, and the first average value. And a means for comparing a plurality of data stored in the storage means, and a deviation of the first average value and a predetermined value or more from the plurality of data stored in the storage means. A means for excluding data from the storage means and a means for calculating a second average value from a plurality of data remaining in the storage means and outputting it as a coordinate value of the pen pressing position are provided. The coordinate detection device according to claim 1, which is characterized in that. 3. A coordinate detecting device comprising: a pen input means using a resistance film sheet; and a calculating means for calculating a coordinate value of the pen pressing position from an output from the pen input means. Sampling a plurality of times of data relating to the coordinate value of the pen pressing position output by the pressing operation, obtaining a first average value from the sampling data of the plurality of times, sampling the plurality of times with respect to the first average value A step of obtaining a variation of data and excluding the sampling data having a variation of a predetermined value or more,
A coordinate detection method comprising the step of calculating a second average value from the remaining sampling data and determining the result as the coordinate value of the pen pressing position.