Method for calibrating touch panel displays

Details Method for calibrating touch panel displays Method for calibrating touch panel displays

1996-05-23

1998-05-12

Powell, Mark R.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

G09G 500

Patent

active

057512760

ABSTRACT:
A method for calibrating a touch panel display includes generating contact coordinates (x.sub.i, y.sub.i,i=1, . . . , N) indicative of N touch points of contact on the touch panel display, where N>3. The touch points can be selected at random on the touch panel, and are not constrained to specific, predefined locations. The contact coordinates (x.sub.i, y.sub.i) are related into screen coordinates (x.sub.i, y.sub.i,) according to the following mapping transformation: ##EQU1## This mapping transformation accounts for all possible two-dimensional transformations including transposition, rotation, and shearing. After N sets of digitizer and screen coordinates are found, values for the parameters a.sub.1, b.sub.1, c.sub.1, a.sub.2, b.sub.2, and c.sub.2 are derived. Preferably, the parameters are determined using an optimizing algorithm, such as a least square fitting algorithm. The parameters a.sub.1, b.sub.1, c.sub.1, a.sub.2, b.sub.2, and c.sub.2 are stored and thereafter used for all mapping transformations.

REFERENCES:
patent: 4710758 (1987-12-01), Mussler et al.
patent: 5283559 (1994-02-01), Kalendra et al.
patent: 5563632 (1996-10-01), Roberts

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