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Phase unwrapping is a usually necessary step in optical interferometry in order to construct a continuous phase
distribution. A straightforward strategy is to filter the noise effectively, followed by a simple phase unwrapping process.
A windowed Fourier filter is proposed to realize this strategy, which has the following properties: (i) it removes the noise
effectively; (ii) it preserves the phase near edges; (iii) it identifies invalid areas; (iv) the amplitude of filtered exponential
phase field can be used as a quality map for quality-guided phase unwrapping; (v) the filtering result is insensitive to the
threshold; (vi) the window size in the filter can be switched according to different requirement. A large window size is
useful for noise filtering while a small window size is useful for protecting signal details.