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.


Available from: Lei HUANG, Jan 07, 2015
1 Follower
  • [Show abstract] [Hide abstract]
    ABSTRACT: Phase unwrapping still plays an important role in the optical metrology field. The phase unwrapping process has direct influence on the accuracy of final results. The aim of this article is to evaluate the performance of several well-known phase unwrapping algorithms for noisy phase measurement. The results of the examined algorithms on simulated and real phase data are presented, and the conclusions regarding the performances of each studied algorithm are given.
    International Journal of Optomechatronics 10/2014; 8(4). DOI:10.1080/15599612.2014.942927 · 0.57 Impact Factor
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: This work presents a robust algorithm for phase unwrapping. The proposed algorithm is based on the expansion of the estimated phase through a linear combination of a set of Basis Functions. We present a novel weighted robust functional which is minimised using a two step strategy. This model allows us to reduce the influence of noise and to remove inconsistent pixels in the estimation of the unwrapped phase. The proposed model assumes that the phase is smooth. Under this assumption, experiments demonstrate that if the phase is corrupted by high levels of noise, our model presents a better performance than state of the art algorithms. For low levels of noise, the results are comparable.
    Optics and Lasers in Engineering 06/2015; 69:13 - 19. DOI:10.1016/j.optlaseng.2015.01.010 · 1.70 Impact Factor
  • [Show abstract] [Hide abstract]
    ABSTRACT: Windowed Fourier ridges algorithm can provide a quality map to assist the quality-guided phase unwrapping. Its performance for discontinuous phase maps is investigated in this paper, where the influence of window size in the algorithm is examined. Three discontinuous phase boundaries, straight, curved, and fused, are tested for both noiseless and noisy situations. Encouraging results are observed. Small window size can be used for higher boundary detection accuracy and can be enlarged if noise is heavy and/or the discontinuities are not obvious in a small area.
    International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN2013); 06/2013