Offline Handwritten Signature Verification Using Deep Neural Networks

José A. P. Lopes, Bernardo Baptista, Nuno Lavado and Mateus Mendes
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José A. P. Lopes: Polytechnic of Coimbra, Instituto Superior de Engenharia de Coimbra, 3030-199 Coimbra, Portugal
Bernardo Baptista: Polytechnic of Coimbra, Instituto Superior de Engenharia de Coimbra, 3030-199 Coimbra, Portugal
Nuno Lavado: Polytechnic of Coimbra, Instituto Superior de Engenharia de Coimbra, 3030-199 Coimbra, Portugal
Mateus Mendes: Polytechnic of Coimbra, Instituto Superior de Engenharia de Coimbra, 3030-199 Coimbra, Portugal

Energies, 2022, vol. 15, issue 20, 1-15

Abstract: Prior to the implementation of digitisation processes, the handwritten signature in an attendance sheet was the preferred way to prove the presence of each student in a classroom. The method is still preferred, for example, for short courses or places where other methods are not implemented. However, human verification of handwritten signatures is a tedious process. The present work describes two methods for classifying signatures in an attendance sheet as valid or not. One method based on Optical Mark Recognition is general but determines only the presence or absence of a signature. The other method uses a multiclass convolutional neural network inspired by the AlexNet architecture and, after training with a few pieces of genuine training data, shows over 85% of precision and recall recognizing the author of the signatures. The use of data augmentation and a larger number of genuine signatures ensures higher accuracy in validating the signatures.

Keywords: handwritten signature recognition; OMR; signature classification; CNN (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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