Article

Quality-guided phase unwrapping technique: comparison of quality maps and guiding strategies.

School of Computer Engineering, Nanyang Technological University, Singapore.
Applied Optics (Impact Factor: 1.69). 11/2011; 50(33):6214-24. DOI: 10.1364/AO.50.006214
Source: PubMed

ABSTRACT Quality-guided phase unwrapping is a widely used technique with different quality definitions and guiding strategies reported. It is thus necessary to do a detailed comparison of these approaches to choose the optimal quality map and guiding strategy. For quality maps, in the presence of noise, transform-based methods are found to be the best choice. However in the presence of discontinuities, phase unwrapping is itself unresolved and hence quality-guided phase unwrapping is not sufficient. For guiding strategies, classical, two-section, and stack-chain guiding strategies are chosen for comparison. If accuracy is the foremost criterion then the classical guiding strategy with a data structure of indexed interwoven linked list is best. If speed is of essence then the stack-chain guiding strategy is the one to use.

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