PhD Thesis

  • Title: Synthetic Signature Generation for Automatic Signature Verification

Date: September 2016
Author: Moisés Díaz Cabrera
Supervisors: Dr. Miguel A. Ferrer Ballester and Dr. Aythami Morales Moreno

Presentation of Thesis

tesis moises portada



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Learning to write is complex and usually starts with lines and scribbles. Before reaching a mature handwriting, children start to know the letters' shapes and their sequence, although the children's motor control is not yet accurate. Modeling this behavior in a mathematically way would allow to understand the mechanical processes from the initial thought of signing to its complete fulfillment.

For instance, statistical models of a particular muscle could gain a better understanding of its general behavior when a stimulus is applied. The kinematical response of an executed movement is also a source of information about the human reaction. Indeed, these characteristics could be mathematically modeled according to the literature in order to design synthetically human movements.

On the other hand, handwriting signature is used as a biometric trait to authenticate the user identity. However, the signature-based biometric systems are not used in practical applications due to their lower performance compared to other biometric technologies. Therefore, it is often preferred to use other traits such as iris, fingerprint or face.

As a bridge between synthesis of biometric data and human modeling, innovative methods are addressed in this dissertation to generate synthetic handwriting signatures following the insights learnt from the motor equivalence theory.

As such, in this Thesis several procedures are proposed to generate i) fully synthetic signature databases and ii) duplicated signatures from a single real specimen. The goal of the proposed methods is to verify whether the generated signatures are able to introduce realistic intra and inter-personal variability in signature-based biometric systems as well as to certify their human-like appearance. For these purposes, machine-oriented and human-oriented evaluations are discussed in the frameworks used in this document.