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    A Focusing Method in the Calibration Process of Image Sensors Based on IOFBs

    TítuloA Focusing Method in the Calibration Process of Image Sensors Based on IOFBs
    Tipo de publicaciónJournal Article
    Año de publicación2010
    AutoresFernández, PR, Lazaro, JL, Gardel, A, Cano, A, Bravo, I
    Idioma de publicaciónEnglish
    Revista académicaSensors
    Volumen10
    Número1
    Páginas47-60
    Fecha de publicación01/2010
    Lugar de publicaciónSuiza
    EditorialMDPI
    Rank in category11/56
    JCR CategoryInstruments & Instrumentation
    JCR Impact Factor1.870
    ISSN1424-8220
    URLhttp://www.mdpi.com/1424-8220/10/1/47/
    DOI10.3390/s100100047
    Resumen

    A focusing procedure in the calibration process of image sensors based on Incoherent Optical Fiber Bundles (IOFBs) is described using the information extracted from fibers. These procedures differ from any other currently known focusing method due to the non spatial in-out correspondence between fibers, which produces a natural codification of the image to transmit. Focus measuring is essential prior to carrying out calibration in order to guarantee accurate processing and decoding. Four algorithms have been developed to estimate the focus measure; two methods based on mean grey level, and the other two based on variance. In this paper, a few simple focus measures are defined and compared. Some experimental results referred to the focus measure and the accuracy of the developed methods are discussed in order to demonstrate its effectiveness.

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