Incorporating local consistency information into the online signature verification process

Abstract

This paper describes a fully operational online signature verification system. Its heart is the SmartPen™, a special input device enabling the perception of force and angle signals. The main key for the success of the approach is the decoupling of the time-alignment stage, based on the dynamic time warping algorithm, and the actual feature-extraction process, in which the wavelet transform plays a central role. This separation allows taking into account information about the relative stability of different phenomena present in a specific person's handwriting. The usefulness of the approach is illustrated by presenting the results of a full-scale field-test.