Phase unwrapping algorithm using breadth-first-search and multi-level segmentation of phase quality interval in digital holography

Ghosh, Anik; Kulkarni, Rishikesh; Gannavarpu, Rajshekhar

doi:10.1080/09500340.2022.2101704

Cited by 2 publications

(1 citation statement)

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“…In recent years, traditional mechanical measurements and manual visual inspections in quality control have been gradually replaced by a range of optical interferometry techniques, such as magnetic resonance imaging [1][2][3], digital holography [4][5][6][7], and fringe projection profilometry [8][9][10]. These methods offer non-contact, whole-field, and highly accurate measurements, leading to faster and more precise feedback in both industrial and scientific domains, all at a reduced cost.…”

Section: Introductionmentioning

confidence: 99%

Residue-guided phase unwrapping in fringe projection measurements using second differences

Fang

2023

Meas. Sci. Technol.

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This paper presents an innovative algorithm for unwrapping 2D phase maps with discontinuities. The method employs residue detection for identifying affected areas at a coarse scale. Unlike traditional techniques relying on subjective assessment, this algorithm automates threshold determination, ensuring precision without manual intervention. At the pixel level, it utilizes a bitmap mask based on second differences and the geometric mean formula to locate inconsistencies within the wrapped map precisely. This coarse-to-fine process establishes an optimal threshold for the second difference mask, resulting in highly accurate unwrapped outcomes while maintaining computational efficiency. Compared to conventional methods, this approach delivers superior unwrapped results, making it suitable for diverse applications. Experimental validation includes computer-simulated surfaces and practical fringe projection systems, accompanied by a thorough error analysis.

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