Imaging method and device based on narrow dynamic range acquisition and adaptive phase recovery

Abstract

The invention discloses an imaging method and device based on narrow dynamic range acquisition and adaptive phase retrieval, and the method comprises the steps: establishing a complex domain imaging optical path; modulating the sample light field for multiple times; performing coherent diffraction imaging through a complex domain imaging light path, keeping a two-dimensional detector of the complex domain imaging light path in a preset state, and collecting a plurality of narrow dynamic range light intensity images of an optical Fourier plane; and reconstructing complex domain information of the observation sample by using an adaptive phase retrieval algorithm according to the acquired multiple narrow dynamic range light intensity images. According to the imaging method, the purpose of complex field imaging can be achieved based on narrow dynamic range collection and self-adaptive phase recovery, the exposure time of single measurement is shortened, photothermal damage caused by measurement is reduced, and the reliability and accuracy of imaging are effectively guaranteed.

Description

technical field [0001] The invention relates to the technical field of computational photography, in particular to an imaging method and device based on narrow dynamic range acquisition and adaptive phase recovery. Background technique [0002] The complex amplitude function of the light field can be represented by two parts, the amplitude and the phase. The former can be directly recorded by the detector, while the latter cannot be directly measured because the existing detectors cannot follow the oscillation frequency of the light wave. Weakly scattering samples such as biological slices and transparent crystals only contribute to the phase of the incident light, while their intensity images remain uniform due to their weak scattering. In this case, the acquisition of complex domain information is crucial for the study of sample structure. As a technology to detect the intensity and phase of light interacting with samples, complex domain imaging is an important topic in t...

AI Technical Summary

Problems solved by technology

However, multiple exposures increase the imaging time

Compared with multiple exposures, the method based on single exposure needs to block the signal at the center or keep the detector saturated, and the algorithm is used to reconstruct the lost low-frequency information during the reconstruction process, but this method also requires a long exposure time to record high frequency diffraction intensity

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