1 June 2008 Retrieval of instantaneous frequency from digital holograms based on adaptive windows
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Optical Engineering, 47(6), 065801 (2008). doi:10.1117/1.2939418
Abstract
In recent years, time-frequency analysis methods have been significantly developed for the processing of fringe patterns. Among such methods, the short-time Fourier transform (STFT) has been proven a valid method to process noisy fringe patterns. In this paper, the complex phasor and the STFT are used to retrieve instantaneous frequency from a series of holograms based on adaptive windows. Continuous phase maps are calculated by integration of the extracted instantaneous frequency, and phase unwrapping is effectively avoided in both temporal and spatial domains. The validity of this method is verified by an experiment. In addition, a comparison between conventional temporal phase unwrapping and the STFT is presented.
Wen Chen, Chenggen Quan, Cho Jui Tay, "Retrieval of instantaneous frequency from digital holograms based on adaptive windows," Optical Engineering 47(6), 065801 (1 June 2008). http://dx.doi.org/10.1117/1.2939418
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KEYWORDS
Digital holography

Holograms

Fourier transforms

Fringe analysis

Time-frequency analysis

3D image reconstruction

Digital filtering

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