Hilbert transform based high-precision digital holography phase reconstruction method

Abstract

An embodiment of the present invention provides a Hilbert transform based high-precision digital holography phase reconstruction method, relating to the field of digital holography microscopy. By using the method, the precision of phase reconstruction can be increased. The method includes: recording a hologram; performing Fourier transform on the digital hologram to obtain a hologram frequency spectrum; filtering the hologram frequency spectrum to remove a zero-order spectrum; performing inverse Fourier transform on the filtered frequency spectrogram to obtain a hologram without the zero order item; performing two-dimensional Hilbert transform on the hologram; constructing an analytic function with the hologram without the zero order item and the Hilbert transform thereof; carrying out argument calculation for the analytic function to obtain a wrapping phase of the phase difference between an object light field and a reference light field; unwrapping the wrapping phase to obtain an unwrapped phase of the phase difference between the object light field and the reference light field; and extracting phase data from a region where the phase is a constant in the object light field, and performing linear fitting such that linear phase distortion correction is achieved and phase distribution of the object light field is obtained.

Description

technical field [0001] The invention relates to the field of digital holographic microscopy, in particular to a digital holographic high-precision phase reconstruction method based on Hilbert transform. Background technique [0002] Digital holographic microscopy is a new type of quantitative imaging and visualization measurement technology, which realizes a high degree of integration of optics, photoelectric conversion technology, and computer technology. It is a full-field, non-contact, quasi-real-time three-dimensional imaging technology. Quantitative phase information of objects can be obtained by using this technology, and it can be flexibly stored, transmitted, filtered, auto-focused, phase distortion compensation, and multi-view display. The above advantages make digital holographic microscopy widely used. [0003] Digital holography is based on interference imaging technology, so compared with other measurement techniques, its phase measurement accuracy is relatively...

AI Technical Summary

Problems solved by technology

However, the first method cannot be used for real-time phase imaging at all, and the second method reduces the contrast of the reconstructed image. More importantly, neither of these two methods fundamentally solves the problem of the influence of noise

For the elimination of the zero-order diffraction term, frequency-domain filtering is the most commonly used method, but this method is only suitable for off-axis digital holography, and there is also the problem of incomplete noise filtering

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