Testing and evaluation of a pen input device using an interial/magnetic sensor module
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Authors
Drakopoulos, Leonidas
Subjects
Advisors
Date of Issue
2008-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
Abstract
In this thesis, the feasibility of developing a pen input device using an inertial/magnetic sensor module is investigated. The emphasis is on testing and evaluation of algorithms for computing handwriting trajectories based on accelerometer measurement data. This research starts by placing the inertial/magnetic sensor in a 2-D plane and writing alphanumeric characters. Before continuing to evaluate the 3-D writing, a calibration algorithm is implemented for computing the length between the nose of the pen input device and the point where the inertial/magnetic sensor is attached to the pen. A velocity correction algorithm is also applied by recognizing the pause phases in the writing in order to eliminate the drift in acceleration measurements and accurately reproduce handwriting trajectories. Extensive experiments conducted for 2-D and 3-D writings indicate that it is possible to develop a pen input device to track handwriting using an inertial/magnetic sensor module. However, the performance of the handwriting tracking depends on the accuracy of the sensor module and the speed of the writing motion.
Type
Thesis
Description
Series/Report No
Department
Organization
Naval Postgraduate School (U.S.)
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NPS Report Number
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Format
xx, 59 p.: ill. ;
Citation
Distribution Statement
Approved for public release; distribution is unlimited.