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Applied Optics

Applied Optics


  • Vol. 41, Iss. 35 — Dec. 10, 2002
  • pp: 7422–7428

Proposed algorithm for phase unwrapping

Xiao Yuan He, Xin Kang, Cho Jui Tay, Chenggen Quan, and Huai Min Shang  »View Author Affiliations

Applied Optics, Vol. 41, Issue 35, pp. 7422-7428 (2002)

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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

OCIS Codes
(100.0100) Image processing : Image processing
(100.2650) Image processing : Fringe analysis

Original Manuscript: April 3, 2002
Revised Manuscript: August 28, 2002
Published: December 10, 2002

Xiao Yuan He, Xin Kang, Cho Jui Tay, Chenggen Quan, and Huai Min Shang, "Proposed algorithm for phase unwrapping," Appl. Opt. 41, 7422-7428 (2002)

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