Generalized Morse wavelets for the phase evaluation of projected fringe pattern


KOCAHAN YILMAZ Ö., COŞKUN E. , ÖZDER S.

MEASUREMENT SCIENCE AND TECHNOLOGY, vol.25, no.10, 2014 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 10
  • Publication Date: 2014
  • Doi Number: 10.1088/0957-0233/25/10/105701
  • Title of Journal : MEASUREMENT SCIENCE AND TECHNOLOGY
  • Keywords: wavelet transforms, fringe analysis, phase measurement, FOURIER-TRANSFORM PROFILOMETRY, ANALYTIC WAVELETS, DISPERSION

Abstract

Generalized Morse wavelets are proposed to evaluate the phase information from projected fringe pattern with the spatial carrier frequency in the x direction. The height profile of the object is determined through the phase change distribution by using the phase of the continuous wavelet transform. The choice of an appropriate mother wavelet is an important step for the calculation of phase. As a mother wavelet, zero order generalized Morse wavelet is chosen because of the flexible spatial and frequency localization property, and it is exactly analytic. Experimental results for the Morlet and Paul wavelets are compared with the results of generalized Morse wavelets analysis.