Forensic Science International
Volume 192, Issue 1 , Pages 1-6, 20 November 2009

Objective paper structure comparison through processing of transmitted light images

Netherlands Forensic Institute, Laan van Ypenburg 6, P.O. Box 24044, 2490 AA The Hague, The Netherlands

Received 22 March 2009; received in revised form 27 June 2009; accepted 1 July 2009. published online 03 August 2009.

Abstract 

A method for the comparison of paper structure using light transmission images and frequency analysis was developed. The resolution of the light transmission images and the algorithm for the feature extraction were greatly improved to enhance the visibility of peaks in the 2D power spectrum that results from frequency analysis. A comparison method based on correlation measures how well the spectra match as a function of the orientation of the paper, yielding an objective and quantitative measure of similarity between 0 and 1. A technical validation was carried out with 25 different papers showing the potential of this method with common copy papers. Finally, the method was applied in a case.

Keywords: Forensic science, Paper structure, Comparison, Feature vector, FFT, Correlation

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PII: S0379-0738(09)00284-9

doi:10.1016/j.forsciint.2009.07.004

Forensic Science International
Volume 192, Issue 1 , Pages 1-6, 20 November 2009

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