Method and apparatus for calibrating an interactive touch system
First Claim
Patent Images
1. A method of calibrating an interactive touch system comprising:
- moving a pointer along at least one path on a touch surface over a calibration image presented on said touch surface;
generating pointer coordinates generally continuously during pointer movement representing pointer contact locations on said touch surface; and
mapping the coordinate system of the touch surface to the coordinate system of the calibration image using said pointer coordinates and said calibration image.
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Abstract
A method of calibrating an interactive touch system includes moving a pointer along at least one path on a touch surface over a calibration image presented on the touch surface. Pointer coordinates are generated generally continuously during the tracing representing pointer contact locations on the touch surface. The coordinate system of the touch surface is mapped to the coordinate system of the calibration image using the pointer coordinates and the calibration image.
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Citations
65 Claims
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1. A method of calibrating an interactive touch system comprising:
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moving a pointer along at least one path on a touch surface over a calibration image presented on said touch surface;
generating pointer coordinates generally continuously during pointer movement representing pointer contact locations on said touch surface; and
mapping the coordinate system of the touch surface to the coordinate system of the calibration image using said pointer coordinates and said calibration image.
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- 2. The method of claim 2 wherein said calibration image includes at least one demarcation providing visual guidance with respect to said at least one path along which said pointer is to be moved.
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53. A method of calibrating an interactive touch system comprising:
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displaying a calibration image on a touch surface, said calibration image specifying at least one path to be traced using a pointer;
moving the pointer along the specified at least one tracing path;
generating pointer coordinates generally continuously during said tracing representing pointer contact locations on said touch surface;
mapping the coordinate system of the touch surface to the coordinate system of the calibration image using said pointer coordinates and said calibration image to calibrate the touch surface coordinate system; and
providing feedback indicating the degree of calibration between the touch surface coordinate system and the calibration image coordinate system. - View Dependent Claims (54, 55, 56, 57)
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58. A touch system comprising:
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a touch screen having a surface on which pointer contacts are made, said touch screen generating pointer coordinates in response to pointer contacts thereon;
a computing device coupled to said touch screen and receiving pointer coordinates generated thereby; and
a projection device coupled to said computing device, said projection device receiving display output from said computing device and projecting an image that is presented on said surface, wherein said computing device is operable to perform a calibration process, during said calibration process said computing device;
providing display output to said projection device causing said projection device to project a calibration image on said surface, said calibration image being within the boundary of said surface and including at least one visual demarcation providing a guide with respect to at least one path a pointer is to be moved across said surface;
receiving the pointer coordinates during movement of said pointer along said at least one path; and
processing the pointer coordinates using the calibration image to map the touch screen coordinate system to the display output coordinate system thereby to calibrate said touch system. - View Dependent Claims (60, 61, 62, 63, 64, 65)
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59. A touch system according to claim 59 wherein said computing device updates the calibration image to provide visual feedback of the perceived path of said pointer in the display output coordinate system.
Specification