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Biometric signature verification has been traditionally performed inpen-based office-like scenarios using devices specifically designed foracquiring handwriting. However, the high deployment of devices such assmartphones and tablets has given rise to new and thriving scenarios forsignature biometrics where handwriting can be performed using not only a penstylus but also the finger via touch interaction. Some preliminary studies havehighlighted the challenge of this new scenario and the necessity of furtherresearch on the topic. The main contribution of this work is to propose a newon-line signature verification architecture adapted to the signature complexityin order to tackle this new and challenging scenario. Additionally, anexhaustive comparative analysis of both pen- and touch-based scenarios usingour proposed methodology is carried out along with a review of the mostrelevant and recent studies in the field. Significant improvements of biometricverification performance and practical insights are extracted for theapplication of signature verification in real scenarios.

Exploiting Complexity in Pen- and Touch-based Signature Biometrics