Method of estimating position of writing nib relative to an optical sensor
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United States of America Patent
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Jan 19, 2010
Grant Date -
Dec 21, 2006
app pub date -
Jul 19, 2006
filing date -
Feb 24, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of estimating a position of a point on a writing implement relative to an optical sensor mounted on the writing implement is provided. The method comprises the steps of: (a) placing the point in contact with a coded surface; (b) capturing, using the sensor, at least two images of the coded surface at different rotations of the writing implement relative to the surface; (c) determining, from a perspective distortion of the coded surface in each image, an estimated rotation and viewing distance for each image; and (d) estimating, from the estimated rotations and viewing distances, the position of the point relative to the optical sensor.
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