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Other signals

In acceleration-based pens, the pen angle and rotation may be derived from the acceleration signals. These pens are very expensive and usually have a deviant shape and/or size. In electromagnetic systems, the skewness of the sensed electromagnetic field function is indicative of the pen angles with respect to the writing plane [194]. This property is also used in commercial systems to improve the accuracy of the pen-tip position estimation.

Esprit Project 8579/MIAMI (Schomaker et al., '95)
Thu May 18 16:00:17 MET DST 1995