Pen-shaped handwriting input apparatus using accelerometers and

Details Pen-shaped handwriting input apparatus using accelerometers and Pen-shaped handwriting input apparatus using accelerometers and

1998-12-23

2000-07-04

Shankar, Vijay

Computer graphics processing and selective visual display system

Display peripheral interface input device

Stylus

178 1901, 178 1903, 178 1904, 178 1905, G08C 2100, G09G 500

Patent

active

060845775

ABSTRACT:
A small-sized pen-shaped input apparatus precisely detects handwriting input. The apparatus compensates for the effects of the inclination of the pen-shaped input apparatus. An initial inclination angle calculating section calculates the initial value of the inclination angle of a pen shaft in a gravity coordinate system. The inclination angle variation calculating section calculates a variation value of the inclination angle of the pen shaft. A handwriting inclination angle calculating section calculates the inclination angle of the pen shaft when writing. A coordinates conversion calculating section converts the coordinate system of the acceleration from the pen shaft coordinate system to the gravity coordinate system. A movement amount calculating section calculates the movement direction and the movement distance of the pen's tip end. Finally, a handwriting detecting section detects a state of handwriting or non-handwriting.

REFERENCES:
patent: 5247137 (1993-09-01), Epperson
patent: 5329276 (1994-07-01), Hirabayashi
patent: 5440326 (1995-08-01), Quinn
patent: 5453758 (1995-09-01), Sato
patent: 5598187 (1997-01-01), Ide et al.

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