Wavelet Transform Analysis of Truncated Fringe Patterns in 3-D Surface Profilometry

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).


Publié dans:
Proceedings of SPIE, 5856, 265-273
Présenté à:
Optical Measurement Systems for Industrial Inspection IV, Bellingham, WA
Année
2005
Mots-clefs:
Laboratoires:




 Notice créée le 2008-12-07, modifiée le 2019-08-12

n/a:
Télécharger le document
PDF

Évaluer ce document:

Rate this document:
1
2
3
 
(Pas encore évalué)