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  • P-ISSN 1225-0163
  • E-ISSN 2288-8985

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    Evaluation of the consistency and homogeneity of artificial latent fingerprint printed with artificial sweat

    Analytical Science and Technology / Analytical Science and Technology, (P)1225-0163; (E)2288-8985
    2015, v.28 no.1, pp.26-32
    https://doi.org/10.5806/AST.2015.28.1.26


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    Abstract

    The consistency and homogeneity of repetitive printing of artificial fingerprint were evaluated usinga visual minutiae comparison method and an Automated Fingerprint Identification System (AFIS). The standardlatent fingerprint pattern was prepared by the printing of a master digital fingerprint pattern with an inkjet printercartridge case filled with artificial sweat. The mdigital fingerprint pattern was prepared with a scanningof an inked fingerprint pattern of a living subject. The intensities of the master digital fingerprint pattern wereadjusted by changing the ‘output level’ values of the Adobe Photoshop CS 5 software. Number of standardlatent fingerprint patterns were printed and then developed with conventional latent fingerprint developingmethods; ninhydrin treatment method and 1,2-indandion(1,2-IND)/ZnCl2 treatment method. The ridge details ofthe latent fingerprint patterns developed with the reagents were visually compared with the inked fingerprintpattern and could confirm that the minutiae of both patterns are visually identical. The ridge detail of the inkedfingerprint and reagent developed standard latent fingerprint patterns were compared with an AFIS. The averagenumber of minutiae searched by the AFIS was 52.4±2.4 (range = 48~56) for 50 ninhydrin developed latentfingerprint patterns, and 50.2±1.9 (range = 47~53) for 50 1,2-IND/ZnCl2 developed latent fingerprint patterns. These low standard deviation values over 50 repetitive printing demonstrated that the 50 standard latent patternswere printed with consistent and homogeneous manner.

    keywords
    latent fingerprint, artificial sweat, AFIS, evaluation, minutiae


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