Statistical evaluation of the influence of writing postures on on-line signatures. Study of the impact of time.

Détails

ID Serval
serval:BIB_24CBB91E3820
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Statistical evaluation of the influence of writing postures on on-line signatures. Study of the impact of time.
Périodique
Forensic Science International
Auteur(s)
Thiéry A., Marquis R., Montani I.
ISSN
1872-6283
ISSN-L
0379-0738
Statut éditorial
Publié
Date de publication
07/2013
Peer-reviewed
Oui
Volume
230
Numéro
1-3
Pages
107-116
Langue
anglais
Résumé
The aim of this study is to investigate the influence of unusual writing positions on a person's signature, in comparison to a standard writing position. Ten writers were asked to sign their signature six times, in each of four different writing positions, including the standard one. In order to take into consideration the effect of the day-to-day variation, this same process was repeated over 12 sessions, giving a total of 288 signatures per subject. The signatures were collected simultaneously in an off-line and on-line acquisition mode, using an interactive tablet and a ballpoint pen. Unidimensional variables (height to width ratio; time with or without in air displacement) and time-dependent variables (pressure; X and Y coordinates; altitude and azimuth angles) were extracted from each signature. For the unidimensional variables, the position effect was assessed through ANOVA and Dunnett contrast tests. Concerning the time-dependent variables, the signatures were compared by using dynamic time warping, and the position effect was evaluated through classification by linear discriminant analysis.
Both of these variables provided similar results: no general tendency regarding the position factor could be highlighted. The influence of the position factor varies according to the subject as well as the variable studied. The impact of the session factor was shown to cover the impact that could be ascribed to the writing position factor. Indeed, the day-to-day variation has a greater effect than the position factor on the studied signature variables. The results of this study suggest guidelines for best practice in the area of signature comparisons and demonstrate the importance of a signature collection procedure covering an adequate number of sampling sessions, with a sufficient number of samples per session.
Mots-clé
Handwriting examination, Signature, Writing position, Writing posture, Dynamic time warping, ANOVA
Création de la notice
01/07/2013 9:39
Dernière modification de la notice
20/08/2019 13:03
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