Abstract
A new, to our knowledge, two-dimensional phase-unwrapping algorithm is proposed. The algorithm, which is based on the global continuity of physical information (e.g. the three-dimensional surface profile of an object) being measured, uses the principle of least-phase difference to rectify errors caused by an erroneous 2π-phase jump in the initial unwrapped phase map obtained by the conventional phase-unwrapping method. Experimental results show that the proposed algorithm works well on a phase map that contains error sources, such as noises, phase discontinuity of more than π, and insufficient sampling. Moreover, the algorithm is most suitable for unwrapping a phase map generated during shape measurement with a step-change surface on the test object, which is usually a critical problem in shape measurement.
© 2002 Optical Society of America
Full Article | PDF ArticleMore Like This
Salah A. Karout, Munther A. Gdeisat, David R. Burton, and Michael J. Lalor
Appl. Opt. 46(5) 730-743 (2007)
J. R. Buckland, J. M. Huntley, and S. R. E. Turner
Appl. Opt. 34(23) 5100-5108 (1995)
R. Cusack, J. M. Huntley, and H. T. Goldrein
Appl. Opt. 34(5) 781-789 (1995)