Publication: Design of one-dimensional power spectrum using two-dimensional fast Fourier transform for discrimination of paper-based kraft tapes
Issued Date
2015-12-01
Resource Type
ISSN
18726283
03790738
03790738
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2-s2.0-84944128751
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Mahidol University
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SCOPUS
Bibliographic Citation
Forensic Science International. Vol.257, (2015), 329-336
Suggested Citation
Sara Sasaoka, Koichi Saito, Kenjirou Higashi, Waree Limwikrant, Kunikazu Moribe, Shinichi Suzuki, Keiji Yamamoto Design of one-dimensional power spectrum using two-dimensional fast Fourier transform for discrimination of paper-based kraft tapes. Forensic Science International. Vol.257, (2015), 329-336. doi:10.1016/j.forsciint.2015.09.016 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/36231
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Title
Design of one-dimensional power spectrum using two-dimensional fast Fourier transform for discrimination of paper-based kraft tapes
Abstract
© 2015 Elsevier Ireland Ltd. A novel type of spectrum, the one-dimensional power spectrum (1D-PS), was designed for the discrimination of adhesive packing tapes, i.e., kraft tapes. The 1D-PS offered complementary information to that provided by the improved two-dimensional PS (2D-PS), which was calculated using our previously established image processes combined with a two-dimensional fast Fourier transform (2D-FFT) to obtain information about the spatial periodicity within kraft tapes. The 1D-PS was calculated using a three-step image process: (i) the 2D-FFT was applied to 50 randomly selected areas in a transmitted light image; (ii) the obtained 2D-PSs were accumulated without applying a logarithmic transform; (iii) the wavenumber and the maximum intensity were plotted on the x-axis and y-axis, respectively. Through an intra-roll comparison, the 1D-PSs collected from single rolls showed similar profiles. In an inter-roll comparison, the 1D-PSs from 50 commercially available brand-name products were classified into 29 groups. The 1D-PSs contained other useful information than that provided by the improved 2D-PSs: they presented more peaks and absolute intensity with a wider range. The 1D-PSs enabled us to compare the spectra quickly and easily, owing to their unchanging profiles regardless of the orientation of the scanned images. A combined use of the 1D-PSs with the improved 2D-PSs-both spectrum types being convenient, rapid, non-destructive, and applicable to dirty and/or damaged samples-could further improve the identification of kraft tapes.