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Global and local phase-unwrapping techniques: a comparison

Gianfranco Fornaro, Giorgio Franceschetti, Riccardo Lanari, Eugenio Sansosti, and Manlio Tesauro

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Abstract

We investigate the relationship between local and global phase-unwrapping techniques. We demonstrate that both algorithms are based on line integration of an estimate of the phase gradient: the former evaluates the integral along a single path, and the latter averages integrals along many paths. This analysis is extended to the weighted case. We also give an interpretation of the errors caused by an incorrect phase-gradient estimate in terms of path-following integrals.

© 1997 Optical Society of America

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