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The Hilbert transform (HT) method is a technique to perform optical phase retrieval from a single off-axis interference pattern. However, one of the significant issues with the HT method is the error generated due to noise in the recorded interference pattern, which can be avoided using a proper pre-filtering step. The importance of pre-filtering of the interference patterns is studied in this study. The observations are verified experimentally by performing quantitative phase imaging of a white blood cell (WBC) using a Mach-Zehnder interferometer configuration.
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