17 September 2024 Pre-modulated phase-shifting coding absolute phase retrieval method
Yanjun Fu, Hewu Li, Guangyu Jiang, Fangfang Li
Author Affiliations +
Abstract

Absolute phase retrieval is an important part of 3D measurement. The conventional phase-unwrapping algorithm requires the projection of extra patterns to retrieve the absolute phase, which reduces the measurement speed. Based on the theory of phase domain modulation, the phase is pre-modulated in the form of a specific code embedded into the phase shift method to reduce the number of projected images for improving the speed. To improve the number of codewords and for the accurate determination of the fringe order, the coding strategy of segmented quantization is adopted at the time of coding. When decoding, the original wrapped phase is obtained by solving the wrapped phase map based on the wrapped phase map with the corresponding fringe order for absolute phase retrieval. The experimental results reveal that this method requires only one set of phase-shift modes to realize absolute phase retrieval. This feature improves the measurement speed and simultaneously maintains an accuracy that is consistent with that of the phase-coding method.

© 2024 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yanjun Fu, Hewu Li, Guangyu Jiang, and Fangfang Li "Pre-modulated phase-shifting coding absolute phase retrieval method," Optical Engineering 63(9), 094102 (17 September 2024). https://doi.org/10.1117/1.OE.63.9.094102
Received: 9 April 2024; Accepted: 16 August 2024; Published: 17 September 2024
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KEYWORDS
Phase shifts

Phase shift keying

Phase retrieval

Fringe analysis

Phase modulation

Modulation

Optical engineering

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