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Title: Phase retrieval with a three-frame phase-shifting algorithm with an unknown phase shift
Authors: Tay, C.J. 
Quan, C. 
Chen, L.
Issue Date: 10-Mar-2005
Citation: Tay, C.J., Quan, C., Chen, L. (2005-03-10). Phase retrieval with a three-frame phase-shifting algorithm with an unknown phase shift. Applied Optics 44 (8) : 1401-1409. ScholarBank@NUS Repository.
Abstract: A three-frame phase-shifting algorithm with a constant but unknown phase shift is proposed. The algorithm is based on background-intensity removal prior to phase retrieval to eliminate an undetermined factor in a fringe pattern. The proposed method is validated on three-dimensional profilometry by fringe projection and on deformation measurement by means of digital speckle shearing interferometry. For a fringe pattern with slow-varying background intensity, the background removal is achieved in the frequency domain. For a speckle pattern, a background removal technique is integrated with the three-frame algorithm. In this process, manual intervention is minimal, and high computational speed is achieved. In addition, high-frequency phase signals would not be removed in the noise-reduction process as is the case hi the bandpass-filtering technique. Accuracy of the method is discussed. © 2005 Optical Society of America.
Source Title: Applied Optics
ISSN: 00036935
DOI: 10.1364/AO.44.001401
Appears in Collections:Staff Publications

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