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For the measurement of the pen-tip position in two dimensions, i.e., the writing plane, a wide variety of techniques exists. Using resistive, pressure sensitive, capacitive, or electromagnetical transducer technology, the position of a pencil can be accurately measured. Sometimes, even acceleration transducers inside the pen are used to measure pen movement [185].

Table 3.3 gives an overview of parameters that may be controlled with a pen.

Table 3.3 : Parameters controlled by a pen

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