Angle characterizing how the pen is held.
How the pen is held depends on the person, and it changes during the signing process. Thus, this feature is useful for on-line signature verification. Pen inclination has two degrees of freedom and it can be represented in two ways. One way is to represent it by angles measured from two axes. The other way is to represent it by azimuth and altitude.
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(2009). Pen Inclination (Pen Tilt). In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_1105
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DOI: https://doi.org/10.1007/978-0-387-73003-5_1105
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