Wavelet Analysis of Resultant Velocity Belonging to Genuine and Forged Signatures

Sharifah Mumtazah Syed Ahmad, Ling Yim Loo, Wan Azizun Wan Adnan, Rina Md. Anwar

Research output: Contribution to journalArticle

Abstract

This study presents a wavelet analysis of resultant velocity features belonging to genuine and forged groups of signature sample. Signatures of individuals were initially classified based on visual human perceptions of their relative sizes, complexities, and legibilities of the genuine counterparts. Then, the resultant velocity was extracted and modeled through wavelet analysis from each sample. The wavelet signal was decomposed into several layers based on maximum overlap discrete wavelet transform (MODWT). Next, the zero crossing rate features were calculated from all the high wavelet sub-bands. A total of seven hypotheses were then tested using a two-way ANOVA testing methodology. Of these, four hypotheses were conducted to test for significance differences between distributions. In addition, three hypotheses were run to provide test for interaction between two factors of signature authentication versus perceived classification. The results demonstrated that both feature distributions belonging to genuine and forged groups of samples cannot be distinguished by themselves. Instead, they were significantly different under the influence of two other inherent factors, namely perceived size and legibility. Such new findings are useful information particularly in providing bases for forensic justifications in establishing the authenticity of handwritten signature specimens.

Original languageEnglish
Pages (from-to)374-381
Number of pages8
JournalJournal of Forensic Sciences
Volume62
Issue number2
DOIs
Publication statusPublished - 01 Mar 2017

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Wavelet Analysis
Visual Perception
Analysis of Variance

All Science Journal Classification (ASJC) codes

  • Pathology and Forensic Medicine
  • Genetics

Cite this

Syed Ahmad, Sharifah Mumtazah ; Loo, Ling Yim ; Wan Adnan, Wan Azizun ; Md. Anwar, Rina. / Wavelet Analysis of Resultant Velocity Belonging to Genuine and Forged Signatures. In: Journal of Forensic Sciences. 2017 ; Vol. 62, No. 2. pp. 374-381.
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Wavelet Analysis of Resultant Velocity Belonging to Genuine and Forged Signatures. / Syed Ahmad, Sharifah Mumtazah; Loo, Ling Yim; Wan Adnan, Wan Azizun; Md. Anwar, Rina.

In: Journal of Forensic Sciences, Vol. 62, No. 2, 01.03.2017, p. 374-381.

Research output: Contribution to journalArticle

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