Optical method for personal identification based on recognition of three-dimensional objects

Junjiro Kobayashi*, Shinichi Komatsu

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)


    We propose an optical method of personal identification utilizing three-dimensional information about a portable object, for which we choose a seal in the present study. The three-dimensional information about the seal, i.e., its engraved design and engraved depth, is recorded with a charge-coupled device (CCD) camera as a two-dimensional oblique projection. For identification, a target projection is compared with a reference projection on the basis of the joint transform correlation (JTC). In order to enhance the detail of the projections for better discrimination, we adopt the modified JTC in which, instead of employing the power spectra of the target and reference projections, their logarithms are used. The feasibility of the proposed method is examined by computer simulation as well as by optical experimentation, and satisfactory results are obtained.

    Original languageEnglish
    Pages (from-to)5897-5903
    Number of pages7
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Issue number8 B
    Publication statusPublished - 2004 Aug


    • Joint transform correlation
    • Optical security
    • Personal identification
    • Seal recognition
    • Three-dimensional object

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


    Dive into the research topics of 'Optical method for personal identification based on recognition of three-dimensional objects'. Together they form a unique fingerprint.

    Cite this