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论文类型：期刊论文
发表时间：2017-02-04
发表刊物：JOURNAL OF MODERN OPTICS
收录刊物：SCIE、EI、Scopus
卷号：64
期号：3
页面范围：231-237
ISSN号：0950-0340
关键字：Phase unwrapping; residues; Goldstein branch-cut; Fourier ransform
摘要：In phase unwrapping, the locations and densities of the residues are indicative of the severity of the unwrapping problem. Gdeisat et al. proposed an algorithm to increase the number of residues in a wrapped phase map to improve the results of phase unwrapping. The method proposed, though, is extremely time-consuming involving the computation of a Fourier transform along with the selection and shift of its spectral components. Moreover, there is no theoretical analysis on the reasons why the frequency shift should be able to increase the number of residues. In an attempt to address these problems, we propose a simple algorithm to increase the number of residues in a wrapped phase map. The algorithm uses a simple multiply operation in spatial domain to realize the frequency shift exploiting the frequency shift property of Fourier transform. We also discuss the relationship between the number of residues and frequency shift. Experimental results have demonstrated that the proposed method can speed up by more than 50% of the calculation time.