Wavelet transform analysis of truncated fringe patterns in 3-D surface profilometry

Sai Siva Gorthi; Kameswara Rao Lolla

doi:10.1117/12.612634

13 June 2005 Wavelet transform analysis of truncated fringe patterns in 3-D surface profilometry

Sai Siva Gorthi, Kameswara Rao Lolla

Proceedings Volume 5856, Optical Measurement Systems for Industrial Inspection IV; (2005) https://doi.org/10.1117/12.612634
Event: Optical Metrology, 2005, Munich, Germany

Abstract

Wavelet transform analysis of projected fringe pattern for phase recovery in 3-D shape measurement of objects is investigated. The present communication specifically outlines and evaluates the errors that creep in to the reconstructed profiles when fringe images do not satisfy periodicity. Three specific cases that give raise to non-periodicity of fringe image are simulated and leakage effects caused by each one of them are analyzed with continuous complex Morlet wavelet transform. Same images are analyzed with FFT method to make a comparison of the reconstructed profiles with both methods. Simulation results revealed a significant advantage of wavelet transform profilometry (WTP), that the distortions that arise due to leakage are confined to the locations of discontinuity and do not spread out over the entire projection as in the case of Fourier transform profilometry (FTP).

Citation Download Citation

Sai Siva Gorthi and Kameswara Rao Lolla "Wavelet transform analysis of truncated fringe patterns in 3-D surface profilometry", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); https://doi.org/10.1117/12.612634

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