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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 6 — Mar. 14, 2011
  • pp: 5126–5133

Noise robust linear dynamic system for phase unwrapping and smoothing

Julio C. Estrada, Manuel Servin, and Juan A. Quiroga  »View Author Affiliations


Optics Express, Vol. 19, Issue 6, pp. 5126-5133 (2011)
http://dx.doi.org/10.1364/OE.19.005126


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Abstract

Phase unwrapping techniques remove the modulus 2π ambiguities of wrapped phase maps. The present work shows a first-order feedback system for phase unwrapping and smoothing. This system is a fast phase unwrapping system which also allows filtering some noise since in deed it is an Infinite Impulse Response (IIR) low-pass filter. In other words, our system is capable of low-pass filtering the wrapped phase as the unwrapping process proceeds. We demonstrate the temporal stability of this unwrapping feedback system, as well as its low-pass filtering capabilities. Our system even outperforms the most common and used unwrapping methods that we tested, such as the Flynn’s method, the Goldstain’s method, and the Ghiglia least-squares method (weighted or unweighted). The comparisons with these methods show that our system filters-out some noise while preserving the dynamic range of the phase-data. Its application areas may cover: optical metrology, synthetic aperture radar systems, magnetic resonance, and those imaging systems where information is obtained as a demodulated wrapped phase map.

© 2011 Optical Society of America

OCIS Codes
(100.2650) Image processing : Fringe analysis
(100.5088) Image processing : Phase unwrapping

ToC Category:
Image Processing

History
Original Manuscript: November 11, 2010
Revised Manuscript: January 15, 2011
Manuscript Accepted: January 25, 2011
Published: March 3, 2011

Citation
Julio C. Estrada, Manuel Servin, and Juan A. Quiroga, "Noise robust linear dynamic system for phase unwrapping and smoothing," Opt. Express 19, 5126-5133 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-6-5126


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