Force of the pen on the writing surface.
Pen pressure values can be acquired as time-series data. This feature is used for on-line signature verification. Generally, pen pressure is measured with a stylus pen and tablet, or a pressure sensitive pen. Pen pressure is represented by N quantized levels, for example 1024 or 512. If the pen pressure is 0, the pen does not touch the writing surface. Some kinds of tablet can detect the pen position even when the pen does not touch the tablet.
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(2009). Pen Pressure. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_2378
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