Noise reduction of temporal phase unwrapping for 3D shape reconstruction using a quality map

C. A. González; A. Dávila; J. G. Garnica

doi:10.1117/12.742376

16 May 2007 Noise reduction of temporal phase unwrapping for 3D shape reconstruction using a quality map

C. A. González, A. Dávila, J. G. Garnica

Proceedings Volume 6422, Sixth Symposium Optics in Industry; 64221R (2007) https://doi.org/10.1117/12.742376
Event: Sixth Symposium Optics in Industry, 2007, Monterrey, Mexico

Abstract

Nowadays, it is possible to find several works on surface reconstruction with optical techniques that employ quality maps, all of them using laboratory cameras with several functions such as manual gain control, low value of white noise, etc. In this work we analyze the possibility to obtain a good 3D shape reconstruction using a webcam, with the aim to develop a low cost portable system. In this work, quality maps are designed to be implemented in the temporal phase unwrapping algorithm with fringe projection for 3D shape reconstruction. The combined techniques allow the noise suppression and the study of illumination areas obtained through fringe projection. In particular, threshold value of quality maps allows to select areas of high visibility in which the temporal phase unwrapping algorithm can be successfully applied. The effect of the position of projector, camera, and sample into the optical setup are considered in order to obtain the optimum fringe density and to suppress Moire or sampling effects in the area of interest. A low pass spatial filter, applied to the temporal phases, suppresses residual noise. The implemented camera calibration process demonstrates that image distortion at optimum spatial locations is negligible. The final 3D shape reconstructions show that the noise usually generated by shadows and dark areas of the specimen under study can be successfully eliminated.

Citation Download Citation

C. A. González, A. Dávila, and J. G. Garnica "Noise reduction of temporal phase unwrapping for 3D shape reconstruction using a quality map", Proc. SPIE 6422, Sixth Symposium Optics in Industry, 64221R (16 May 2007); https://doi.org/10.1117/12.742376

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