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

1999-11-09

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1903, 178 1905, G08C 2100

Patent

active

059818840

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: 5557076 (1996-09-01), Wieczorek et al.
patent: 5598187 (1997-01-01), Ide et al.

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