AU741135B2 - Data correction circuit - Google Patents
Data correction circuit Download PDFInfo
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- AU741135B2 AU741135B2 AU69886/98A AU6988698A AU741135B2 AU 741135 B2 AU741135 B2 AU 741135B2 AU 69886/98 A AU69886/98 A AU 69886/98A AU 6988698 A AU6988698 A AU 6988698A AU 741135 B2 AU741135 B2 AU 741135B2
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Description
S F Ref: 422861
AUSTRALIA
PATENTS ACT 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT
ORIGINAL
Name and Address of Applicant: Actual Inventor(s): Address for Service: Invention Title: NEC Corporation 7-1, Shiba Minato-ku Tokyo
JAPAN
Noriyasu Nakamura Spruson Ferguson, Patent Attorneys Level 33 St Martins Tower, 31 Market Street Sydney, New South Wales, 2000, Australia Data Correction Circuit The following statement is a full description of this invention, including the best method of performing it known to me/us:- 5845 DATA CORRECTION CIRCUIT BACKGROUND OF THE INVENTION The present invention relates to a data correction circuit for correcting dispersion of data affected by noises and intrinsic errors of a device.
In recent years, personal digital assistants (PDA) which are provided with a transparent input medium such as a touch panel mounted on a screen of a liquid crystal display (LCD) so as to input an instruction or information by touching the screen with a pen or a finger, have been increasingly used. In such a personal digital assistant, an operator can communicate with the personal digital assistant via the information displayed on the screen.
For example, a pen or a finger is touched to an icon on a screen to enable an operator to give an instruction to 15 the personal digital assistant. At this time, a touch panel outputs location data corresponding to the touch position.
This location data are transferred to a CPU, and the CPU judges the content of a relevant instruction according to this location data.
Particularly, in the case of an input device of a touch panel or a tablet system requiring a high resolution of a handwriting recognition, an A/D (analog-digital) converter as means for converting the touch position into positional coordinates is used with certain extent of errors included therein. The errors, since the variation of a voltage or an impedance detected from the ratio of a resistance or a capacitance to the touch position of the touch panel is converted into a digital value, are caused on the basis of the 2 errors arisen from a nonlinear error of such a device itself and an absolute precision of the A/D converter.
For instance, in the case of a capacitance detection system as a touch panel input system, which is composed of a touch panel having an optically transparent conductive film with a predetermined resistivity and a display such as a LCD, the touch panel is arranged on the LCD, and the operator touches the conductive film overlapped with the icon on the screen with a stylus such as his finger or a pen having a capacitance. This touch changes the impedance of the touch panel, and the measuring of this impedance change can bring a detection of the stylus touch position on the display.
However, in this capacitance detection system, the conductive film is nonuniform, accompanied by a nonlinear S 15 distortion or a trapezoidal distortion of an image. As a .result, the distribution of the coordinates on the conductive :-"film is dispersed and becomes imprecise. The trapezoidal distortion shows that a scanned figure is distorted trapezoidally by slanting the axis of an electron beam for scanning with respect to a photoelectric surface. Hence, the corresponding coordinates on the display cannot be recognized precisely.
Moreover, the error attributed to the absolute precision of the A/D converter occurs, and the input data including the error are sent to the CPU. Accordingly, a difference arises in data between the actual touch position of the display with the stylus such as the operator's finger or the pen and the measured position.
In order to correct such errors, a conventional correction method using software is used in addition to -3raising the precision by hardware. One example of the correction method using software is disclosed in Japanese Patent Laid-Open Publication No. 2-193215, KOUJI KITAGAWA et al, entitled "Data Processing System." In this conventional case, thedata processing system comprises an input means of a transparent or translucent touch panel, a coordinate detecting means to output coordinate information at a touch point on the touch panel, a coordinate converting means for converting the touch point to the corresponding coordinates on the screen of the display on the basis of the coordinate information, a storage means for storing correction information for correcting a shift amount caused between an instruction position of the input means and an actual input position, and a determining means to correct the coordinate information according to the correction information stored to determine display coordinates on the display, with the result of improving detection precision of the touch position and operability.
However, in the conventional correction circuit described above, an influence of the error or the distortion between the actual touch position of the touch panel with the operator's finger or the pen and the measured position arises, and, when dispersion is large in position data, a precise true value cannot be obtained.
Thus, a need exists to provide a data correction circuit, which is capable of correcting dispersion of data affected by various noises, and distortions and errors of a device to obtain true value data.
SUMMARY
In accordance with one aspect of the present invention, there is provided a data correction circuit, comprising detection means for detecting maximum and minimum values of input data; buffer means for storing said input data; rearranging means for rearranging said stored data; eliminating means for eliminating the maximum and the minimum values from the stored data to output the remaining stored data; and averaging means for averaging the remaining stored data to output average data.
The rearranging means can compare new input data with previous input data and rearrange the stored data in order of increasing values on the basis of the comparison results.
Alternatively, the detecting means can compare new input data with previous input data and rearrange the stored data in order of decreasing values on the basis of the comparison results.
The eliminating means can include an eliminating device for eliminating the maximum and the minimum data from the detection data.
In accordance with another aspect of the present invention, there is provided a data correction circuit, comprising detecting means which detects maximum and minimum values of input data and deletes the maximum and minimum values from the input data to output the remaining data; and averaging means for averaging the remaining data to output averaged position data; wherein the detecting means includes first and second buffer storage means. The detecting means compares new input data with previous input data in order of increasing values to obtain the minimum data on the basis of the comparison results and stores the obtained minimum data into the first buffer storage means.
Further, the detecting means compares new input data with previous input data in order of decreasing values to obtain the maximum data on the basis of the comparison results and stores the obtained maximum data into the second buffer storage means.
According to another aspect of the present invention, a data correction circuit comprises a touch panel which is touched with a stylus to output an analog position signal corresponding to touch position; an analog-digital converter for converting the analog position signal sent from the touch panel to digital position data to output the digital position data; [R:\LIBQ] 1026.doc:edg a maximum minimum value detector which successively inputs the digital position data, compares new digital position data with previous digital position data stored in the maximum minimum value detector, rearranges the order of said stored digital position data according to a result of said comparison, and outputs detection data including maximum and minimum digital position data and intermediate digital position data between the maximum and the minimum digital position data; a maximum minimum value eliminator to eliminate the maximum and the minimum digital position data from the detection data to output the remaining data; and averaging means for averaging the remaining data to output averaged position data.
According to another aspect of the present invention, a data correction circuit comprises a touch panel which is 0U I .\LQ10 doc cdg -6touched with a stylus to output an analog position signal corresponding to touch position; an analog-digital converter for converting the analog position signal sent from the touch panel to digital position data to output the digital position data; a maximum minimum value detector including first and second buffer storages, which successively inputs the digital position data, compares new digital position data with previous digital position data stored in the maximum minimum value detector from larger value side in order of their larger values to obtain the minimum data as proposed minimum data, stores the proposed minimum data into the first buffer storage when the new digital position data is larger than the proposed minimum data on the basis of the comparison results, 15 and stores the new digital position data into the first buffer storage when the new digital position data is smaller than .the proposed minimum data on the basis of the comparison results, which compares the new digital position data with the previous digital position data stored in the maximum minimum value detector from smaller value side in order of e .their smaller values to obtain the maximum data as proposed maximum data, stores the proposed maximum data into the second buffer storage when the new digital position data is smaller than the proposed maximum data on the basis of the comparison results, and stores the new digital position data into the second buffer storage when the new digital position data is larger than the proposed maximum data on the basis of the comparison results, and which eliminates the maximum and the minimum data stored in the first and the second buffer storages to output the remaining data; and 7 averaging means for averaging the remaining data to output averaged position data.
In the present invention, the maximum minimum value detector, the maximum minimum value eliminator and the averaging means can be constructed by a microprocessor, memories and peripheral devices.
BRIEF DESCRIPTION OF THE DRAWINGS The objects, features and advantages of the present invention will become more apparent from the consideration of the following detailed description, taken in conjunction with the accompanying drawings, in which: Fig. 1 is a block diagram of a data correction circuit according to a first embodiment of the present 15 invention; and Fig. 2 is a block diagram of a data correction *circuit according to a second embodiment of the present invention.
S.
DESCRIPTION OF THE PREFERRED EMBODIMENTS SReferring now to the drawings, there is shown in Fig.
1 a data correction circuit according to the first embodiment of the present invention.
In Fig. 1, the data correction circuit comprises a touch panel 1 to output an analog position signal 6 corresponding to a touch position when its screen is touched with a stylus such as an operator's finger or a pen to carry out a key input, an analog-digital (A/D).converter 2 for converting the analog position signal 6 to digital position data 7, a maximum minimum value detector 3 including buffer -8registers Ila to llf, which inputs the digital position data 7 from the A/D converter and detects the maximum and the minimum values to output detected data 8, a maximum minimum value eliminator 4 for eliminating the maximum and the minimum values from the detected data 8 to output the remaining data 9, and an averaging means 5 for averaging the remaining data 9 to output averaged position data The operation of the data correction circuit described above will be described in detail in connection with Fig. 1.
When the stylus touches the touch panel 1, the touch panel 1 outputs an analog position signal 6 including noises generated out of inside of an information processing device (not shown) which the touch panel 1 is mounted to and errors 15 caused by a nonlinear distortion and a trapezoidal distortion of the touch panel 1 as a device. The A/D converter 2 ~converts the input analog position signal 6 including the errors to digital position data 7.
As the analog position signal 6 is converted to the digital position data 7 in the A/D converter 2, an conversion error attributed to the absolute precision of the A/D converter 2 is also added to the digital position data 7.
The obtained digital position data 7 are taken in the maximum minimum value detector 3 and are stored into the buffer register Ila, llb, lic, ild, ile or llf therein.
In Fig. 1, when the new digital position data 7 are maximum, this maximum digital position data are stored in the buffer register Ila, and when the new digital position data 7 are minimum, this minimum digital position data are in the buffer register Ilf. The intermediate digital position data 7 9between the maximum and the minimum digital position data are stored in the buffer registers lilb to lile in order of their larger values.
Next, just before the next digital position data 7 are then stored into the maximum minimum value detector 3, the new position data 7 are successively compared with the previous position data 7 stored in the buffer registers lla to llf, respectively, and the digital position data 7 stored in the buffer registers lla to llf are rearranged in order of their larger values on the basis of the comparison result.
When the predetermined value data are stored in the maximum minimum value detector 3, this predetermined value data act as a control data to output the data stored in the buffer registers lla to llf as the detected data 8 to the 15 maximum minimum value eliminator 4. In the maximum minimum value eliminator 4, the maximum and the minimum values stored :in the buffer registers lla and llf of the detected data 8 are eliminated, and the remaining data 9 stored in the buffer registers Ilb to lie are sent to the averaging means In the averaging means 5, the sum of the data stored in the buffer registers lib to lle is divided by the number of the buffer registers Ilb to lile to obtained the average value if' r as averaged position data 10 to be output. That is, in this embodiment, the maximum and the minimum data stored in the first and the last buffer registers lla and Ilf could have been affected by the errors and are thus eliminated. As a result, the average data in the middle part of a normal distribution can be obtained.
Fig. 2 illustrates a data correction circuit according to the second embodiment of the present invention.
In Fig. 2, like reference characters designate like or corresponding parts of the first embodiment shown in Fig. 1 and thus the repeated description thereof can be omitted for brevity.
In this embodiment, as shown in Fig. 2, the maximum minimum value eliminator 4 of the first embodiment is omitted, and a maximum minimum value detector 13 further includes first and second averaging buffer registers 12a and 12b besides the buffer registers Ila to Ilf.
The digital position data 7 are sent from the A/D converter 2 to the maximum minimum value detector 13 and are stored in the buffer registers Ila to 1lf, and the new position data 7 are successively compared with the previous position data 7 stored in the buffer registers Ila to llf S 15 from the larger value side to rearrange the position data stored in the buffer registers Ila to llf in order of their larger values and to obtain the minimum data as the proposed minimum data.
At this time, when the new digital position data 7 are larger than the proposed minimum data, the proposed minimum data as the minimum data among the rearranged position data are stored into the first averaging buffer register 12a.
On the other hand, when the new digital position data 7 are smaller than the proposed minimum data, the new digital position data are stored into the first averaging buffer register 12a. With this operation, the minimum data are exactly stored in the first averaging buffer register 12a.
Next, similarly, the new digital position data 7 are successively compared with the previous position data stored in the buffer registers Ilf to Ila from the smaller value -11side to rearrange the position data stored in the buffer registers Ilf to Ila in order of their smaller values and to obtain the maximum data as the proposed maximum data.
At this time, when the new digital position data 7 are smaller than the proposed maximum data, the proposed maximum data as the maximum data among the rearranged previous position data are stored into the second averaging buffer register 12b. On the other hand, when the new digital position data 7 are larger than the proposed maximum data, the new digital position data are stored into the second averaging buffer register 12b. With this operation, the maximum data are exactly stored in the second averaging buffer register 12b.
The maximum and the minimum data stored in the first 15 and the second averaging buffer registers 12a and 12b are then 00:% deleted, and the remaining data 14 stored in the buffer 0 %0 registers llb to lie are output to the averaging means 5. In the averaging means 5, the sum of the data stored in the buffer registers llb to Ile is divided by the number of the buffer registers lib to lie to obtained the average value as averaged position data 15 to be output. That is, in this embodiment, the maximum and the minimum data stored in the ~first and the last buffer registers Ila and llf could have been affected by the errors and are thus eliminated. As a result, the average data in the middle part of a normal distribution can be obtained.
According to the present invention, the maximum minimum value detectors 3 and 13, the maximum minimum value eliminator 4 and the averaging means 5 can be constructed by not only hard-wired logic devices such as shift registers, -12counters, numeric comparators but also a microcomputer including a CPU, memories and peripheral devices.
As described above, in a data correction circuit according to the present invention, the maximum and the minimum values are eliminated from the largely dispersed data, and the remaining data are averaged to reduce various noises, and distortions and errors that a device intrinsically holds.
As a result, the dispersion of the data can be corrected, and a true value can be obtained.
While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by those embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.
o
Claims (9)
1. A data correction circuit, comprising: detecting means for detecting maximum and minimum values of input data; buffer means for storing said input data; rearranging means for rearranging said stored data; eliminating means for eliminating the maximum and the minimum values from the stored data to output the remaining stored data; and averaging means for averaging the remaining stored data to output average data.
2. A data correction circuit of claims 1, wherein the rearranging means compares new input data with previous input data and rearranges the stored data in order of increasing values on the basis of the comparison results.
3. A data correction circuit of claim 1, wherein the rearranging means compares new input data with previous input data and rearranges the stored data in order of decreasing values on the basis of the comparison results.
4. A data correction circuit of claim 1, wherein the eliminating means includes an eliminating device for eliminating the maximum and the minimum data from the detection data. A data correction circuit, comprising: detecting means which detects maximum and minimum values of input data and deletes the maximum and minimum values from the input data to output the remaining data; and averaging means for averaging the remaining data to output averaged data; wherein the detecting means includes first and second buffer storage means, and wherein the detecting means compares new input data with previous input data in order of increasing values to obtain the minimum data on the basis of the comparison results and stores the obtained minimum data into the first buffer storage means, and the detecting means compares new input data with previous input data in order of decreasing values to obtain the maximum data on the basis of the comparison results and stores the obtained S maximum data into the second buffer storage means.
RLOFF 6Q 0 [RA\LIBQ] 1026.doc:cdg -14-
6. A data correction circuit, comprising: a touch panel which is touched with a stylus to output an analog position signal corresponding to touch position; an analog-digital converter for converting the analog position signal sent from the touch panel to digital position data to output the digital position data; a maximum minimum value detector which successively inputs the digital position data, compares new digital position data with previous digital position data stored in the maximum minimum value detector, rearranges the order of said stored digital position data according to a result of said comparison, and outputs detection data lo including maximum and minimum digital position data and intermediate digital position data between the maximum and the minimum digital position data; [R:\LIBQ] 1026.doc:edg a maximum minimum value eliminator to eliminate the maximum and the minimum digital position data from the detection data to output the remaining data; and averaging means for averaging the remaining data to output averaged position data.
7. A data correction circuit of claim 6, wherein the maximum minimum value detector, the maximum minimum value eliminator and the averaging means are constructed by a microprocessor, memories and peripheral devices.
8. A data correction circuit, comprising: a touch panel which is touched with a stylus to output an analog position signal corresponding to touch position; an analog-digital converter for converting the analog position signal sent from the touch panel to digital position data to output the digital position data; a maximum minimum value detector including first and second buffer storages, which successively inputs the digital position data, compares new digital position data with previous digital position data stored in the maximum minimum value detector from larger value side in order of their larger values to obtain the minimum data as proposed minimum data, stores the proposed minimum data into the first buffer storage when the new digital position data is larger than the proposed minimum data on the basis of the comparison results, and stores the new digital position data into the first buffer storage when the new digital position data is smaller than pU-, the proposed minimum data on the basis of the comparison icomparison -16- results, which compares the new digital position data with the previous digital position data stored in the maximum minimum value detector from smaller value side in order of their smaller values to obtain the maximum data as proposedmaximum data, stores the proposed maximum data into the second buffer storage when the new digital position data is smaller than the proposed maximum data on the basis of the comparison results, and stores the new digital position data into the second buffer storage when the new digital position data is larger than the proposed maximum data on the basis of the comparison results, and which eliminates the maximum and the minimum data stored in the first and the second buffer storages to output the remaining data; and averaging means for averaging the remaining data to output averaged position data.
9. A data correction circuit of claim 8, wherein the maximum minimum value detector and the averaging means are constructed by a microprocessor, memories and peripheral devices. A data correction circuit substantially as herein described with reference to Fig. 1 or Fig. 2. DATED this Twenty-sixth Day of September, 2001 NEC Corporation Patent Attorneys for the Applicant SPRUSON FERGUSON K\U S 7>~
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14641797A JPH10333835A (en) | 1997-06-04 | 1997-06-04 | Circuit for correcting data |
| JP9-146417 | 1997-06-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU6988698A AU6988698A (en) | 1998-12-10 |
| AU741135B2 true AU741135B2 (en) | 2001-11-22 |
Family
ID=15407226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU69886/98A Ceased AU741135B2 (en) | 1997-06-04 | 1998-06-03 | Data correction circuit |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH10333835A (en) |
| AU (1) | AU741135B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002063151A (en) | 2000-08-22 | 2002-02-28 | Mitsubishi Electric Corp | Microcomputer |
| US20150029122A1 (en) | 2012-03-14 | 2015-01-29 | Nec Casio Mobile Communications, Ltd. | Electronic device, information processing method, and program |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5739814A (en) * | 1992-09-28 | 1998-04-14 | Sega Enterprises | Information storage system and book device for providing information in response to the user specification |
| US6028595A (en) * | 1996-09-09 | 2000-02-22 | Ricoh Company, Ltd. | Touch-screen display |
-
1997
- 1997-06-04 JP JP14641797A patent/JPH10333835A/en active Pending
-
1998
- 1998-06-03 AU AU69886/98A patent/AU741135B2/en not_active Ceased
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5739814A (en) * | 1992-09-28 | 1998-04-14 | Sega Enterprises | Information storage system and book device for providing information in response to the user specification |
| US6028595A (en) * | 1996-09-09 | 2000-02-22 | Ricoh Company, Ltd. | Touch-screen display |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH10333835A (en) | 1998-12-18 |
| AU6988698A (en) | 1998-12-10 |
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