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Title: Investigating the Common Authorship of Signatures by Off-Line Automatic Signature Verification without the Use of Reference Signatures
Authors: Diaz, Moises 
Ferrer, Miguel A. 
Ramalingam, Soodamani
Guest, Richard
UNESCO Clasification: 530602 Innovación tecnológica
120304 Inteligencia artificial
Keywords: Off-line signature verification
No reference signatures
Feature-distance matrix
Signature complexity
Issue Date: 2020
Journal: IEEE Transactions on Information Forensics and Security 
Abstract: In automatic signature verification, questioned specimens are usually compared with reference signatures. In writer-dependent schemes, a number of reference signatures are required to build up the individual signer model while a writer-independent system requires a set of reference signatures from several signers to develop the model of the system. This paper addresses the problem of automatic signature verification when no reference signatures are available. The scenario we explore consists of a set of signatures, which could be signed by the same author or by multiple signers. As such, we discuss three methods which estimate automatically the common authorship of a set of off-line signatures. The first method develops a score similarity matrix, worked out with the assistance of duplicated signatures; the second uses a feature-distance matrix for each pair of signatures; and the last method introduces pre-classification based on the complexity of each signature. Publicly available signatures were used in the experiments, which gave encouraging results. As a baseline for the performance obtained by our approaches, we carried out a visual Turing Test where forensic and non-forensic human volunteers, carrying out the same task, performed less well than the automatic schemes.
ISSN: 1556-6013
DOI: 10.1109/TIFS.2019.2924195
Source: IEEE Transactions on Information Forensics and Security [ISSN 1556-6013], v. 15 (8742639), p. 487-499
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