Yazar "Oezder, Serhat" seçeneğine göre listele

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    Öğe
    Profile Measurement of Objects by Using Stockwell and Continuous Wavelet Transforms
    (IEEE, 2008) Kocahan, Ozlem; Coskun, Emre; Oezder, Serhat
    In this study, 3D profile measurements of objects are tested with integral transforms by using a standard fringe projection technique consisting of a CCD (charge-coupled device) camera and a projector. The surface profile of a rough object is studied experimentally with crossed optical axes geometry. A two dimensional fringe pattern by introducing the carrier frequencies in two spatial directions, x and y, is analyzed with S-transform and continuous wavelet transform based on Model wavelet algorithms. Phase gradient and phase methods are presented for continuous wavelet transform (CWT) and S-transform of the fringe pattern. At the end, results of experimental application of these techniques are compared.
  • [ X ]
    Öğe
    S-transform analysis of projected fringe patterns
    (Spie-Int Soc Optical Engineering, 2007) Kocahan, Oezlem; Oezder, Serhat; Coskun, Emre
    3D profile measurement of an object is studied experimentally by using a standard fringe projection technique consisting of a CCD camera and a digital projector. The height profile of the object is calculated through the phase change distribution of the projected fringes with two dimensional fringe pattern by introducing the carrier frequencies in two spatial directions, x and y. The phase distribution is extracted from the optical fringe pattern by using S-transform gradient and S-transform phase methods. Experimental result for the Fourier transform profilometry algorithm is compared with the results of the S-transform analysis.