Graphics tablet scanning and error reduction

Details Graphics tablet scanning and error reduction Graphics tablet scanning and error reduction

1992-05-27

1994-11-22

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

382 3, G08C 2100, G06K 900

Patent

active

053671309

ABSTRACT:
Graphics tablet scanning and error reduction. Errors are detected and reduced by reading a plurality of points, sorting the points, and selecting the median point. Errors are detected and reduced by comparing the range of lowest to highest points with a preset limit and signaling an error if the limit is exceeded. Errors are detected and reduced in a resistive tablet by placing a load resistance on the output of the tablet and comparing the output voltage with predetermined limits, characterizing the contact area into valid and invalid contacts.

REFERENCES:
patent: 4700022 (1987-10-01), Salvador et al.
patent: 4992630 (1991-02-01), Mletzko
patent: 5159159 (1992-10-01), Asher

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