Noise robust linear dynamic system for phase unwrapping and smoothing



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Quiroga Mellado, Juan Antonio and Estrada, Julio César and Servín Guirado, Manuel (2011) Noise robust linear dynamic system for phase unwrapping and smoothing. Optics Express, 19 (6). pp. 5126-5133. ISSN 1094-4087

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Phase unwrapping techniques remove the modulus 2 π 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.

Item Type:Article
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© 2011 Optical Society of America

Uncontrolled Keywords:Fringe-Pattern-Analysis, Fourier-Transform, Algorithms, Regions
Subjects:Sciences > Physics > Optics
ID Code:22320
Deposited On:11 Jul 2013 10:24
Last Modified:07 Feb 2014 10:45

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