Phase unwrapping algorithm based on double-frequency fringe projection and fringe background

Hong Zhao; Chunwei Zhang

doi:10.1117/12.2075884

19 February 2015 Phase unwrapping algorithm based on double-frequency fringe projection and fringe background

Hong Zhao, Chunwei Zhang

Proceedings Volume 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014); 944905 (2015) https://doi.org/10.1117/12.2075884
Event: The International Conference on Photonics and Optical Engineering and the Annual West China Photonics Conference (icPOE 2014), 2014, Xi'an, China

Abstract

A phase unwrapping algorithm specially designed for phase-shifting fringe projection profilometry (FPP) is proposed. This algorithm is based on a principle that combines a refined double-frequency fringe projection algorithm and a fringe background based quality guided phase unwrapping algorithm (QGPUA). The phase demodulated from high-frequency fringe images are partially unwrapped by that from the low-frequency ones. This would help to avoid phase order ambiguity in the eventual phase unwrapping while guarantee the phase resolution. The fringe background based QGPUA is adopted to completely unwrap the partially unwrapped phase. The quality map utilized during the phase unwrapping is generated from the fringe background and divided into different subregions. Further unwrapping for the partially unwrapped phase goes on in the order from phase in the highest quality subregion to that in the lowest one gradually. Partially unwrapped phase in each subregion is unwrapped with flood-fill algorithm. Therefore the phase unwrapping speed can be improved. The proposed method can make the phase unwrapping for phase-shifting FPP more robust and faster. Experiment result confirms the effectiveness of the proposed method.

Citation Download Citation

Hong Zhao and Chunwei Zhang "Phase unwrapping algorithm based on double-frequency fringe projection and fringe background", Proc. SPIE 9449, The International Conference on Photonics and Optical Engineering (icPOE 2014), 944905 (19 February 2015); https://doi.org/10.1117/12.2075884

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KEYWORDS

Phase shifts

3D metrology

Phase shift keying

3D modeling

Signal to noise ratio

Calibration

Fringe analysis

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