Correction of alignment and linearity errors in a stylus input system
First Claim
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1. A method of creating a linearity map, comprising the steps of:
- (i) touching a display device at a plurality of predetermined locations defined by a calibration grid corresponding to the display device, wherein the calibration grid is non-uniform, and the calibration grid comprises a first area of a first calibration density and a second area of a second calibration density different from said first calibration density;
(ii) detecting in a digitizer coupled to the display device, coordinates for each touched predetermined location; and
(iii) recording each predetermined location'"'"'s screen coordinates and corresponding detected digitizer coordinates.
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Abstract
A method and system for correcting alignment and linearity errors in devices using a finger or stylus input device with a display device interactively coupled to a digitizer is disclosed. Touching intersections in a calibration grid on the display device may be performed to create a linearity map. Subsequently, detected stylus input is mapped to a sector in the linearity map, and resultant screen coordinates are calculated using ratios within a reference rectangle corresponding to the detected stylus input and the mapped sector.
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Citations
19 Claims
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1. A method of creating a linearity map, comprising the steps of:
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(i) touching a display device at a plurality of predetermined locations defined by a calibration grid corresponding to the display device, wherein the calibration grid is non-uniform, and the calibration grid comprises a first area of a first calibration density and a second area of a second calibration density different from said first calibration density;
(ii) detecting in a digitizer coupled to the display device, coordinates for each touched predetermined location; and
(iii) recording each predetermined location'"'"'s screen coordinates and corresponding detected digitizer coordinates. - View Dependent Claims (2, 3, 4, 5)
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6. A method of creating a linearity map, comprising the steps of:
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(i) touching a display device at a plurality of predetermined locations;
(ii) detecting on a digitizer, coordinates for each touched predetermined location; and
(iii) recording each predetermined location'"'"'s screen coordinates and corresponding detected digitizer coordinates, wherein a calibration grid displayed on the display device coupled to the digitizer defines the predetermined locations, and wherein the calibration grid is non-uniform, and comprises a first area of a first density and a second area of a second density. - View Dependent Claims (7, 8, 9)
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10. A method of creating a linearity map, comprising the steps of:
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(i) touching a display device at a plurality of predetermined locations defined by a calibration grid corresponding to the display device, wherein the calibration grid is non-uniform, and the calibration grid comprises a first area of a first calibration density and a second area of a second calibration density different from said first calibration density;
(ii) detecting in a digitizer coupled to the display device, coordinates for each touched predetermined location; and
(iii) recording each predetermined location'"'"'s screen coordinates and corresponding detected digitizer coordinates, wherein the first area corresponds to an area of higher distortion within a data processing device, and the second area corresponds to an area of lower distortion within the data processing device. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A computer readable medium storing a data structure of a calibration map for use with a stylus input system, said data structure comprising:
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an array of a plurality of input points, each input point corresponding to a physically identified position on a display device coupled to a digitizer that receives input via a stylus, and each input point storing corresponding detected input position coordinates of a detected digitizer position when the physically identified position corresponding to the input point is identified by the stylus;
wherein said array of points is non-uniform, and has a first area of a first calibration density and a second area of a second calibration density different from said first calibration density. - View Dependent Claims (17, 18, 19)
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Specification