Multi-level phase unwrapping method by combining the branch-cut and minimum cost flow

Fenfen Hua; Lijun Lu

doi:10.1117/12.2607860

15 February 2022 Multi-level phase unwrapping method by combining the branch-cut and minimum cost flow

Fenfen Hua, Lijun Lu

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121660Z (2022) https://doi.org/10.1117/12.2607860
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

The complexity of the mountainous terrain leads to the large phase gradients of the interferogram, especially in the area with the dense vegetation. And the resulting low coherence brings difficulty to phase unwrapping. To overcome the difficulty of phase unwrapping in these areas and the weakness of a single method, this paper proposes a novel multi-level phase unwrapping method combining the branch-cut and minimum cost flow algorithm. The proposed method is inspired by the principle of “control first then fragments” in surveying, specifically, the unwrapping task is progressively performed from the high-coherence regions to the low-coherence regions by taking the coherence as an indicator. Firstly, the unwrapped phase result obtained from the minimum cost flow method in the high-coherence region is seen as the “control” part, i.e. the initial phases. Secondly, the “fragments” phases are computed using the branch-cut algorithm. The process is repeated several times until the interferom of the whole image is done, and each time a part of the remaining low-coherence region is determined by setting an appropriate coherence threshold then unwrapped based on the previous unwrapping phases. The experimental result using the TanDEM-X Bistatic mode demonstrates the new method has higher efficiency and more reliability than the branch-cut method and the minimum cost flow method.

Citation Download Citation

Fenfen Hua and Lijun Lu "Multi-level phase unwrapping method by combining the branch-cut and minimum cost flow", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121660Z (15 February 2022); https://doi.org/10.1117/12.2607860

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KEYWORDS

Coherence (optics)

Interferometric synthetic aperture radar

Image processing

Image segmentation

Interferometry

Earth sciences

Remote sensing

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