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    Decoupling Intensity Radiated by the Emitter in Distance Estimation from Camera to IR Emitter

    TitleDecoupling Intensity Radiated by the Emitter in Distance Estimation from Camera to IR Emitter
    Publication TypeJournal Article
    Año de publicación2013
    AutoresCano, A, Luna, CA, Lazaro, JL, Fernandez, P, Infante, A, Pompa, Y
    Idioma de publicaciónEnglish
    JournalSensors
    Volumen13
    Número6
    Páginas7184-7211
    Fecha de publicación05/2013
    Lugar de publicaciónSuiza
    EditorialMDPI
    JCR Category1,79 (Q1)
    ISSN1424-8220
    DOIdoi:10.3390/s130607184
    Abstract

    Various models using radiometric approach have been proposed to solve the problem of estimating the distance between a camera and an infrared emitter diode (IRED). They depend directly on the radiant intensity of the emitter, set by the IRED bias current. As is known, this current presents a drift with temperature, which will be transferred to the distance estimation method. This paper proposes an alternative approach to remove temperature drift in the distance estimation method by eliminating the dependence on radiant intensity. The main aim was to use the relative accumulated energy together with other defined models, such as the zeroth-frequency component of the FFT of the IRED image and the standard deviation of pixel gray level intensities in the region of interest containing the IRED image. By using the abovementioned models, an expression free of IRED radiant intensity was obtained. Furthermore, the final model permitted simultaneous estimation of the distance between the IRED and the camera and the IRED orientation angle. The alternative presented in this paper gave a 3% maximum relative error over a range of distances up to 3 m.

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