Synchronous phase extraction technique and its applications

Y. Y. Hung, S. H. Tang, G. C. Jin, Q. Zhu

Research output: Contribution to journalConference articlepeer-review


A new technique for phase extraction of a fringe pattern is presented and verified in this paper. The technique makes use of the orthogonality of the trigonometric functions. It acquires the wrapped phase of a fringe pattern at a pixel point with the use of intensity values at that pixel point and its neighbors. It is capable of obtaining the unwrapped phase of a fringe pattern at every pixel point automatically provided that the phase of the fringe pattern is monotonically increasing. In contrast to the Fast Fourier transform (FFT) based phase measurement technique, this technique not only eliminates the difficulty of choosing a passing- band in the frequency domain but also provides great flexibility for processing an arbitrary number of pixel points at every row of the image.

Original languageEnglish (US)
Pages (from-to)738-747
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberpt 2
StatePublished - 1990
Externally publishedYes
EventOptical Testing and Metrology III: Recent Advances in Industrial Optical Inspection - San Diego, CA, USA
Duration: Jul 8 1990Jul 13 1990

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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