Demodulation of single interferograms using a sliding 2-D continuous wavelet transform method

Abstract

In this paper, we present an alternative technique for the demodulation of single interferograms using a sliding 2-D continuous wavelet transform (2-D CWT) method. The sliding strategy proposed in this work is used with two purposes: to reduce the processing time when the 2-D CWT is applied, and to solve the problem of the phase ambiguity when closed fringes are present. Experimental results with real and simulated interferograms show that the proposed multiresolution method is a proper alternative for many applications of interferogram demodulation with closed fringes.

Keywords:

• fringe patterns
• phase recovery
• wavelets

Acknowledgements

The authors would like to thank the support for the realization of this work to the Consejo Nacional de Ciencia y Tecnologa (CONACYT), Mexico, through the project CB-2008-01/102041.