Extraction and analysis of forensic document examiner features used for writer identification

  • Authors:
  • Vladimir Pervouchine;Graham Leedham

  • Affiliations:
  • Forensics and Security Lab, School of Computer Engineering, Nanyang Technological University, Block N4, Nanyang Avenue, Singapore 639798, Singapore;University of New South Wales Asia, 1 kay Siang Road, Singapore 248922, Singapore.

  • Venue:
  • Pattern Recognition
  • Year:
  • 2007

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Abstract

In this paper we present a study of structural features of handwriting extracted from three characters ''d'', ''y'', and ''f'' and grapheme ''th''. The features used are based on the standard features used by forensic document examiners. The process of feature extraction is presented along with the results. Analysis of the usefulness of features was conducted via searching the optimal feature sets using the wrapper method. A neural network was used as a classifier and a genetic algorithm was used to search for optimal feature sets. It is shown that most of the structural micro features studied, do possess discriminative power, which justifies their use in forensic analysis of handwriting. The results also show that the grapheme possessed significantly higher discriminating power than any of the three single characters studied, which supports the opinion that a character form is affected by its adjacent characters.