Optically imaging pen configured for calculating accurate nib positions
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United States of America Patent
Stats
-
Feb 7, 2012
Grant Date -
Oct 6, 2011
app pub date -
Jun 16, 2011
filing date -
May 25, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optically imaging pen for interacting with a printed substrate. The pen includes: a nib for interacting with the printed substrate; an image sensor for imaging an area of the printed substrate to provide image data; a processor configured for: (i) identifying target elements in the image data and inferring a perspective transform due to a tilt of the pen; (ii) acquiring and decoding coded data contained in the image data; (iii) calculating a nib position using a tag location, the perspective transform and a known geometry of pen optics; and (iv) generating digital ink based on the nib position.
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