Dynamic adjustment of filter weights for digital tablets
AssigneeSummagraphics Corporation
InventorRobert M. McDermott
Life of this patent
Estimating the term…
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.
Claims10
In a digitizer tablet, a method for determining and reporting pointing device position over the digitizer tablet, comprising the steps:
- (a) determining a value representing a position of the pointing device along a coordinate axis of the tablet,
- (b) determining the direction of the current movement of the pointing device,
- (c) measuring the consistency of the current movement of the pointing device compared to previous movements,
- (d) modifying the said value determined in step (a) based on the measured consistency of step (c),
- (e) reporting the modified value determined in step (d) as a position along the coordinate axis of the pointing device.
In a digitizer tablet, a method for determining and reporting pointing device position over the digitizer tablet, comprising the steps:
- (a) determining a value representing a position of the pointing device along a coordinate axis of the tablet,
- (b) determining the direction of the current movement of the pointing device,
- (c) measuring the consistency of the current movement of the pointing device compared to previous movements,
- (d) modifying the said value determined in step (a) based on the measured consistency of step (c),
- (e) reporting the modified value determined in step (d) as a position along the coordinate axis of the pointing device.
Dependencies are inferred from the claim text.