Dynamic adjustment of filter weights for digital tablets

Details Dynamic adjustment of filter weights for digital tablets Dynamic adjustment of filter weights for digital tablets

1991-07-25

1993-01-12

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

382 48, 382 41, 382 51, G08C 2100

Patent

active

051792540

ABSTRACT:
A digitizer table which employs low pass filtering of raw coordinate data to reduce noise and jitter. A weighted filtering is employed, in which the new position data is averaged with a previous average or previous position data before being reported. The weighting factor applied to the new data is determined by the degree of monotonicity represented by the data, with intentional movements of the pointing device indicating high monotonicity undergoing light filtering but noise indicating low monotonicity undergoing heavy filtering.

REFERENCES:
patent: 3521235 (1970-07-01), Becker
patent: 4736439 (1988-04-01), May

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