COORDINATES CORRECTION APPARATUS, COORDINATES CORRECTION PARAMETER CALCULATION APPARATUS, COORDINATES CORRECTION METHOD, COORDINATES CORRECTION PARAMETER CALCULATION METHOD, MEMORY MEDIUM FOR STORING COORDINATES CORRECTION CONTROL PROGRAM, AND MEMORY MEDIUM FOR STORING COORDINATES CORRECTION PARAMETER CALCULATION PROGRAM

US 7,012,199 B2
Filed: 12/06/1999
Issued: 03/14/2006
Est. Priority Date: 12/04/1998
Status: Expired due to Fees

First Claim

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1. A coordinates correction apparatus comprising:

coordinate input means being placed on a display unit;

display control means for controlling display of a plurality of reference points on the display unit, the reference points indicating positions for use in calculating coordinates correction parameters, wherein said coordinate input means inputs a coordinate corresponding to one of the displayed reference points based on a user designation;

coordinate reception means for receiving the coordinate input by said coordinate input means corresponding to the one of the displayed reference points;

discriminating means for discriminating, among the displayed reference points, a reference point corresponding to the coordinate received by said coordinate reception means;

coordinates keeping means for keeping the coordinate receiving by said coordinate reception means as the coordinate corresponding to the reference point discriminated by said discriminating means;

repeating means for repeating processes of said display control means, said coordinate reception means, said discriminating means and said coordinates keeping means to obtain coordinates for remaining reference points for which a coordinate is not kept by said coordinates keeping means, wherein said display control means is controlled to display only the remaining reference points;

parameter calculation means for calculating coordinates correction parameters for nonlinear conversion, based on the coordinates kept by said coordinate keeping means;

parameter keeping means for keeping the calculated coordinates correction parameters for nonlinear conversion; and

coordinates correction means for correcting the coordinates input via said coordinates input means by the nonlinear conversion using the calculated coordinates correction parameters.

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Abstract

Correction of coordinates input by a user through an input device is effected using coordinate correction parameters. To calculate the coordinate correction parameters, a plurality of reference points are displayed on the input device. Coordinate input is designated by a user, and if the coordinate is determined to correspond to a reference point, then the coordinate input is retained. The process is repeated until a coordinate is kept for each reference point, wherein only remaining reference point(s) for which a corresponding coordinate has not yet been retained are displayed. Once coordinates have been input for the reference points, a correspondence between coordinate input and a reference point is determined, and corresponding coordinates are kept for each reference point. Using correction parameters calculated based on the kept coordinates, it is possible to correct device characteristics of the input device such as position aberration, even if such characteristics are non-linear.

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34 Claims

1. A coordinates correction apparatus comprising:
- coordinate input means being placed on a display unit;
  
  display control means for controlling display of a plurality of reference points on the display unit, the reference points indicating positions for use in calculating coordinates correction parameters, wherein said coordinate input means inputs a coordinate corresponding to one of the displayed reference points based on a user designation;
  
  coordinate reception means for receiving the coordinate input by said coordinate input means corresponding to the one of the displayed reference points;
  
  discriminating means for discriminating, among the displayed reference points, a reference point corresponding to the coordinate received by said coordinate reception means;
  
  coordinates keeping means for keeping the coordinate receiving by said coordinate reception means as the coordinate corresponding to the reference point discriminated by said discriminating means;
  
  repeating means for repeating processes of said display control means, said coordinate reception means, said discriminating means and said coordinates keeping means to obtain coordinates for remaining reference points for which a coordinate is not kept by said coordinates keeping means, wherein said display control means is controlled to display only the remaining reference points;
  
  parameter calculation means for calculating coordinates correction parameters for nonlinear conversion, based on the coordinates kept by said coordinate keeping means;
  
  parameter keeping means for keeping the calculated coordinates correction parameters for nonlinear conversion; and
  
  coordinates correction means for correcting the coordinates input via said coordinates input means by the nonlinear conversion using the calculated coordinates correction parameters.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
- - 2. The coordinates correction apparatus of claim 1, wherein the coordinates correction parameters are a, b, c, d, e, f, g, and h and wherein the nonlinear conversion for correcting the coordinates (x, y) input via the coordinates input means to corrected coordinates (X, Y) is expressed by:
    - X=axy+bx+cy+d
      Y=exy+fx+gy+h.
  - 3. The coordinates correction apparatus of claim 1, further comprising a coordinates output means for outputting the coordinates corrected by the coordinates correction means.
  - 4. The coordinates correction apparatus of claim 1, wherein the parameter calculation means calculates the coordinates correction parameters for the nonlinear conversion based on the coordinates kept for all of the plurality of reference points.
  - 5. The coordinates correction apparatus of claim 1, wherein the parameter calculation means calculates the coordinates correction parameters by solving simultaneous equations based on the kept coordinates corresponding to the plurality of displayed reference points.
  - 6. The coordinates correction apparatus of claim 1, wherein said display is a liquid crystal display.
  - 7. The coordinates correction apparatus of claim 1, wherein the plurality of displayed reference points is four reference points expressed in pairs of two x coordinates and two y coordinates in an xy rectangular coordinates system.
  - 8. The coordinates correction apparatus of claim 7, wherein the parameter calculation means calculates the coordinates correction parameters a, b, c, d, e, f, g, and h by solving the following formulas where the coordinates of the four reference points as (X₀, Y₀), (X₁, Y₀), (X₀, Y₁), and (X₁, Y₁), setting the received coordinates as (x_nw, y_nw), (x_ne, y_ne), (x_sw, y_sw), and(x_se, y_se);
    - $X_{0} = a x_{n w} y_{n w} + b x_{n w} + c y_{n w} + d$ $Y_{0} = e x_{n w} y_{n w} + f x_{n w} + g y_{n w} + h$ $X_{1} = a x_{n e} y_{n e} + b x_{n e} + c y_{n e} + d$ $Y_{0} = e x_{n e} y_{n e} + f x_{n e} + g y_{n e} + h$ $X_{0} = a x_{s w} y_{s w} + b x_{s w} + c y_{s w} + d$ $Y_{1} = e x_{s w} y_{s w} + f x_{s w} + g y_{s w} + h$ $X_{1} = a x_{s e} y_{s e} + b x_{s e} + c y_{s e} + d$ $Y_{1} = e x_{s e} y_{s e} + f x_{s e} + g y_{s e} + h,$ wherein the parameter keeping means keeps the calculated coordinates correction parameters a, b, c, d, e, f, g, and h, and wherein the coordinates correction means corrects the coordinates input via said coordinate input means (x, y) to corrected coordinates (X, Y) by the nonlinear conversion
      X=axy+bx+cy+d
      Y=exy+fx+gy+h.
  - 9. The coordinates correction apparatus of claim 1, further comprising a deciding means for deciding to control reference point display using said display control means, to receive coordinates using said coordinates reception means, to discriminate using said discriminating means, to keep user-designated coordinates using said coordinates keeping means and to calculate coordinates correction parameters using said parameter calculation means in a case that said parameter keeping means does not keep the coordinates correction parameters.
  - 10. The coordinates correction apparatus of claim 1, wherein the coordinates correction apparatus is a portable information processing apparatus.
  - 11. The coordinates correction apparatus of claim 1, wherein the coordinates correction apparatus can be connected to a network.
  - 12. The coordinate correction apparatus according to claim 1, wherein said display control means causes the displayed reference point to disappear as said coordinates reception means receives the coordinates corresponding to the reference point.

13. A coordinates correction method for controlling a coordinates correction apparatus which has a coordinate input means placed on a display unit, the method comprising:
- controlling display of a plurality of reference points on the display unit, the reference points indicating positions for use in calculating coordinates correction parameters, wherein said coordinate input means inputs a coordinate corresponding to one of the displayed reference points based on an user designation;
  
  receiving the coordinate input by said coordinate input means corresponding to the one of the displayed reference points;
  
  discriminating, among the displayed reference points, a reference point corresponding to the coordinate received in said receiving step;
  
  keeping the coordinate received in said receiving step as the coordinate corresponding to the reference point discriminated in said discriminating step as the coordinate corresponding to the reference point discriminated in said discriminating step;
  
  repeating said display controlling, receiving, discriminating and keeping steps to obtain coordinates for remaining reference points for which a coordinate is not kept in said keeping step, wherein said display controlling step controls display of reference points to display only the remaining reference points;
  
  calculating coordinates correction parameters for nonlinear conversion, based on the coordinates kept in said step of keeping user-designated coordinate;
  
  keeping the calculated coordinates correction parameters for nonlinear conversion; and
  
  correcting the coordinates input in the coordinates receiving step by the nonlinear conversion using the calculated coordinates correction parameters.
- View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- - 14. The coordinates correction method of claim 13, wherein the coordinates correction parameters are a, b, c, d, e, f, g, and h, and wherein the nonlinear conversion for correcting the coordinates (x, y) input via the coordinates receiving step to the corrected coordinates (X, Y) in said coordinates correction step is represented by
    X=axy+bx+cy+d
    Y=exy+fx+gy+h.
  - 15. The coordinates correction method of claim 13, further comprising a coordinates output step of outputting the coordinates corrected in the coordinates correction step.
  - 16. The coordinates correction method of claim 13, wherein the coordinates correction parameters for the nonlinear conversion based on the coordinates kept for all of the plurality of reference points are calculated in said step of calculating coordinates correction parameters.
  - 17. The coordinates correction method of claim 13, wherein said step of calculating coordinates correction parameter is executed by solving simultaneous equations based on the kept coordinates corresponding to the plurality of displayed reference points.
  - 18. The coordinates correction method of claim 13, wherein said display is liquid crystal display.
  - 19. The coordinates correction method of claim 13, wherein the plurality of displayed reference points is four reference points expressed in pairs of two x coordinates and two y coordinates in an xy rectangular coordinates system.
  - 20. The coordinates correction method of claim 19, wherein coordinates correction parameters, a, b, c, d, e, f, g, and h, are calculated in the parameter calculation step by solving the following formulas where the coordinates of the four reference points as (X₀, Y₀), (X₁, Y₀), (X₀, Y₁), and (X₁, Y₁), setting the received coordinates as(x_nw, y_nw), (x_ne, y_ne), (x_sw, y_sw), and (x_se, y_se):
    - $X_{0} = a x_{n w} y_{n w} + b x_{n w} + c y_{n w} + d$ $Y_{0} = e x_{n w} y_{n w} + f x_{n w} + g y_{n w} + h$ $X_{1} = a x_{n e} y_{n e} + b x_{n e} + c y_{n e} + d$ $Y_{0} = e x_{n e} y_{n e} + f x_{n e} + g y_{n e} + h$ $X_{0} = a x_{s w} y_{s w} + b x_{s w} + c y_{s w} + d$ $Y_{1} = e x_{s w} y_{s w} + f x_{s w} + g y_{s w} + h$ $X_{1} = a x_{s e} y_{s e} + b x_{s e} + c y_{s e} + d$ $Y_{1} = e x_{s e} y_{s e} + f x_{s e} + g y_{s e} + h,$ wherein the calculated coordinates correction parameters are kept in the parameter keeping step, and wherein the coordinates input via said coordinates receiving step (x, y) are corrected to corrected coordinates (X, Y) in the coordinates correction steps by the nonlinear conversion
      X=axy+bx+cy+d
      Y=exy+fx+gy+h.
  - 21. The coordinates correction method of claim 13, further comprising deciding to perform said steps of controlling display of a plurality of reference points, receiving coordinates, discriminating which reference point corresponds to the user-designated coordinate, keeping the user-designated coordinate and calculating coordinates correction parameters in a case that said step of keeping calculated coordinates correction parameters does not keep the coordinates correction parameters.
  - 22. The coordinates correction method of claim 13 which is a coordinates correction method for controlling a portable information processing apparatus.
  - 23. The coordinate correction method of claim 13, wherein said controlling display of a plurality of reference points on the display further comprises causing the displayed reference points to disappear as the coordinates corresponding to the reference point are received by said receiving coordinates step.

24. A computer-readable memory medium for storing a coordinates correction control program for controlling a coordinates correction apparatus which has a coordinate input means placed on a display unit, execution steps of the program comprising:
- controlling display of a plurality of reference points on the display unit, the reference points indicating positions for use in calculating coordinates correction parameters, wherein said coordinate input means inputs a coordinate corresponding to one of the displayed reference points based on an user designation;
  
  receiving the coordinate input by said coordinate input means for the displayed reference points;
  
  discriminating, among the displayed reference points, a reference point corresponding to the coordinate received in said receiving coordinates step;
  
  keeping the coordinate receiving in said coordinate receiving step as the coordinate corresponding to the reference point discriminated in said discriminating step;
  
  repeating said display controlling, receiving, discriminating and keeping steps to obtain coordinates for remaining reference points for which a coordinate is not kept in said keeping step, wherein said display controlling step controls display of reference points to display only the remaining reference points;
  
  calculating coordinates correction parameters for nonlinear conversion, based on the coordinates kept in said step of keeping user-designated coordinates;
  
  keeping the calculated coordinates correction parameters for nonlinear conversion; and
  
  correcting the coordinates input in the coordinates receiving step by the nonlinear conversion using the calculated coordinates correction parameters.
- View Dependent Claims (25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
- - 25. The computer-readable memory medium of claim 24, wherein the coordinates correction parameters are a, b, c, d, e, f, g, and h, and wherein the nonlinear conversion for correcting the coordinates (x, y) input via the coordinates receiving step to the corrected coordinates (X, Y) in said coordinates correction step is represented by
    X=axy+bx+cy+d
    Y=exy+fx+gy+h.
  - 26. The computer-readable memory medium of claim 24, further comprising outputting coordinates corrected in said coordinates correction step.
  - 27. The computer-readable memory medium for storing a coordinates correction control program of claim 24, wherein the coordinates correction parameters for the nonlinear conversion based on the coordinates kept for all of the plurality of reference points are calculated in said calculating coordinates correction parameters.
  - 28. The computer-readable memory medium of claim 24, wherein said calculating coordinates correction parameter is executed by solving simultaneous equations based on the kept coordinates corresponding to the plurality of displayed reference points.
  - 29. The computer-readable memory medium of claim 24, wherein said display is liquid crystal display.
  - 30. The computer-readable memory medium of claim 24, wherein the plurality of displayed reference points is four reference points expressed in pairs of two x coordinates and two y coordinates in an xy rectangular coordinates system.
  - 31. The computer-readable memory medium of claim 30, wherein coordinates correction parameters, a, b, c, d, e, f, g, and h, are calculated in the parameter calculation step by solving the following formulas where the coordinates of the four reference points as (X₀, Y₀), (X₁, Y₀), (X₀, Y₁), and (X₁, Y₁), setting the received coordinates as (x_nw, y_nw), (x_ne, y_ne), (x_sw, y_sw), and (x_se, y_se):
    - $X_{0} = a x_{n w} y_{n w} + b x_{n w} + c y_{n w} + d$ $Y_{0} = e x_{n w} y_{n w} + f x_{n w} + g y_{n w} + h$ $X_{1} = a x_{n e} y_{n e} + b x_{n e} + c y_{n e} + d$ $Y_{0} = e x_{n e} y_{n e} + f x_{n e} + g y_{n e} + h$ $X_{0} = a x_{s w} y_{s w} + b x_{s w} + c y_{s w} + d$ $Y_{1} = e x_{s w} y_{s w} + f x_{s w} + g y_{s w} + h$ $X_{1} = a x_{s e} y_{s e} + b x_{s e} + c y_{s e} + d$ $Y_{1} = e x_{s e} y_{s e} + f x_{s e} + g y_{s e} + h,$ wherein the calculated coordinates correction parameters are kept in the parameter keeping step, and wherein the coordinates input via said coordinates receiving step (x, y) are corrected to corrected coordinates (X, Y) in the coordinates correction steps by the nonlinear conversion
      X=axy+bx+cy+d
      Y=exy+fx+gy+h.
  - 32. The computer-readable memory medium of claim 24, further comprising deciding to execute said display controlling step, said coordinates receiving step, and said parameter calculation step if said keeping step does not keep the coordinates correction parameters.
  - 33. The computer-readable memory medium of claim 24, wherein the program is a coordinates correction program for controlling a portable information processing apparatus.
  - 34. The computer readable memory medium of claim 24, wherein said controlling display of a plurality of reference points on the display further comprises causing the displayed reference points to disappear as the coordinates corresponding to the reference point are received by said receiving coordinates step.

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Current Assignee
Canon Kabushiki Kaisha (Canon Inc.)
Original Assignee
Canon Kabushiki Kaisha (Canon Inc.)
Inventors
Fukuda, Ryoji
Primary Examiner(s)
Wu, Xiao
Assistant Examiner(s)
ABDULSELAM, ABBAS I

Application Number

US09/454,969
Publication Number

US 20030056999A1
Time in Patent Office

2,290 Days
Field of Search

345/157, 345/158, 345/162, 345/174, 345/175, 345/179, 382/291, 382/294, 382/295, 396/188, 178/18.02, 178/18.01, 178/18.03
US Class Current

178/18.02
CPC Class Codes

G06F 3/0418 for error correction or com...

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