Automatic touch screen calibration method
First Claim
1. An automatic calibration method for a touch screen used in conjuction with a display during interactive sessions, where the touch screen and the display have first and second sets of axes and the first and second sets of axes are asumed to substantially overlay, respectively, said method comprising the steps of:
- (a) displaying, prior to each of the interactlve sessions, a first point on the display;
(b) obtaining first coordinates of a first touch on the touch screen at approximately the first point; and
(c) generating terms in a translation matrix for translating coordinates of the first touch into coordinates.
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Abstract
A method for automatically calibrating a touch screen used in conjunction with a graphic display is executed prior to every interactive session. Three points, defining perpendicular axes, are displayed and an operator is instructed to touch the touch screen at each of the points in succession. Coordinates for the three points output by the touch screen are checked for reasonableness and perpendicularity. If these checks are passed, a coordinate translation matrix is generated for converting touch screen coordinates into display coordinates.
127 Citations
17 Claims
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1. An automatic calibration method for a touch screen used in conjuction with a display during interactive sessions, where the touch screen and the display have first and second sets of axes and the first and second sets of axes are asumed to substantially overlay, respectively, said method comprising the steps of:
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(a) displaying, prior to each of the interactlve sessions, a first point on the display; (b) obtaining first coordinates of a first touch on the touch screen at approximately the first point; and (c) generating terms in a translation matrix for translating coordinates of the first touch into coordinates. - View Dependent Claims (3)
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2. An automatic calibration method for a touch screen used in conjuction with a display during interactive sessions, the touch screen and the display have first and second se axes and the first and second sets of axes are asumed to substantially overlay, respectively, said method comprising the steps of:
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(a) displaying, prior to each of the interactive sessions, a first point on the display; (b) prompting a first touch at the first point; (c) obtaining first coordinates of the first touch on the touch screen at approximately the first point; and (d) generating terms in a translation matrix for traslating coordinates of the first touch into display coordinates.
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4. An automatic calibration method for a touch screen used in conjunction with a display during interactive sessions, said method comprising the steps of:
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(a) displaying, prior to each of the interactive sessions, a first point on the display; (b) obtaining first coordinates of a first touch on the touch screen at approximately the first point; (c) displaying a second point on the display; (d) obtaining second coordinates of a second touch at approximately the second point; and (e) generating terms in a translation matrix for translating coordinates of the first touch into display coordinates in dependence upon the first and second coordinates. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11)
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12. An automatic calibration method for a touch creen used in conjunction with a display by an perator during an interactive session, said method omprising the steps of:
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(a) prompting the operator to touch first point on the display when the interactive session begins; (b) obtaining first coordinates of a first touch on the touch screen at approximately the first point; (c) prompting the operator to touch a second point on the display after step (b); (d) obtaining second coordinates of a second touch at approximately the second point; (e) prompting the operator to touch a third point on the display after step (d); (f) obtaining third coordinates of a third touch at approximately the third point; and (g) generating terms in a translation matrix for translating subsequent touches on the touch screen into display coordinates in dependence upon the first, second and third coordinates. - View Dependent Claims (13, 14, 15, 16)
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17. An automatic calibration method for a touch screen used in conjunction with a display during interactive sessions, said method comprising the steps of:
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(a) displaying, prior to each of the interactive sessions, a first point on the display; (b) obtaining first coordinates of a first touch on the touch screen at approximately the first point; (c) comparing the first coordinates with a predetermined range of values; (d) indicating an error if said comparing step (c) determines that at least one of the first coordinates is outside of the predetermined range of values; and (e) generating terms in a translation matrix for translating coordinates of the first touch into display coordinates if said comparing step (c) determines that the first coordinates are within the predetermined range of values.
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Specification