Method and apparatus for determining the position of a member co

Details Method and apparatus for determining the position of a member co Method and apparatus for determining the position of a member co

1992-03-25

1993-08-31

Schreyer, Stafford

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

052411397

ABSTRACT:
A method and apparatus for determining a position of a member contacting a touch screen includes determining initial coordinates of the member at a first time, determining subsequent coordinates of the member at a subsequent time, and defining possible coordinates of the member to be between the initial coordinates and subsequent coordinates, then redetermining subsequent coordinates of the member at a further subsequent time, and redefining possible coordinates of the member to be between redetermined subsequent coordinates and previously defined possible coordinates. Redetermining subsequent coordinates and redefining possible coordinates may be repeated until subsequent coordinates and redefined coordinates are within a predetermined distance for a predetermined number of repetitions. The method and apparatus may be reinitialized if subsequent coordinates are beyond a specified distance of previously determined possible coordinates.

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patent: 4963702 (1990-10-01), Yaniger et al.
Reed, M. A., "Self-Calibration and Coordinate Conversion for a Touchpad or Touch Screen Computer Input Device", IBM Tech. Disc. Bull., vol. 30, #4, Sep. 1987, pp. 1663-1666.
Reed, M. A., "Device Driver for a Touchpad or Touch Screen Computer Input Device", IBM Tech. Disc. Bull., vol. 30, No. 4, Sep. 1987, pp. 1674-1676.

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