Method of correcting skew between a digitizer and a digital disp

Details Method of correcting skew between a digitizer and a digital disp Method of correcting skew between a digitizer and a digital disp

1991-01-11

1992-05-19

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

364405, 340712, 382 45, G08C 2100

Patent

active

051151073

ABSTRACT:
A method of producing an image drive signal which is free of skew. Disclosure is made of a point of sale merchandising system having a transparent digitizer mounted on an LCD module. A stylus is used to draw a signature on the digitizer, and the signature is displayed on the LCD module in registration with the moving stylus. Skew effects are eliminated by performing a mapping transformation using a set of 6 transformation constants. These constants are derived from data obtained while placing the stylus over three reference spots on the display.

REFERENCES:
patent: 4622437 (1986-11-01), Bloom et al.
patent: 4637057 (1987-01-01), Kermisch
patent: 4678869 (1987-07-01), Kable
patent: 4710758 (1987-12-01), Mussler et al.
patent: 4848496 (1989-07-01), Murakami et al.
patent: 4929935 (1990-05-01), Rysavy et al.

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