Enhanced two-frequency phase-shifting method

Jae Sang Hyun, Zhang Song

Research output: Contribution to journalArticlepeer-review

108 Citations (Scopus)


One of the major challenges of employing a two-frequency (or two-wavelength) phase-shifting algorithm for absolute three-dimensional shape measurement is its sensitivity to noise. Therefore, three- or more-frequency phase-shifting algorithms are often used in lieu of a two-frequency phase-shifting algorithm for applications where the noise is severe. This paper proposes a method to use geometric constraints of digital fringe projection system to substantially reduce the noise impact by allowing the use of more than one period of equivalent phase map for temporal phase unwrapping. Experiments successfully verified the enhanced performance of the proposed method without increasing the number of patterns.

Original languageEnglish
Pages (from-to)4395-4401
Number of pages7
JournalApplied Optics
Issue number16
Publication statusPublished - 2016 Jun 1

Bibliographical note

Publisher Copyright:
© 2016 Optical Society of America.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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