Phase imaging method based on thin scattering medium

Abstract

The invention provides a phase imaging method based on a thin scattering medium. The method comprises: placing a thin scattering medium in front of a digital image sensor, adjusting the distance between a target wavefront and the digital image sensor, matching the pixel size, making incident light to penetrate through the thin scattering medium to form speckles distributed spatially, and using thedigital image sensor for collecting formed speckle patterns; preprocessing the original speckle pattern; building a CNN and training a network by using the acquired and preprocessed picture pair data; extracting wavefront information in a speckle pattern by using a trained CNN network, the input of the network being a processed single-frame speckle pattern, and the output of the network being a phase grey-scale map or an amplitude grey-scale map or a complex amplitude corresponding to the wavefront according to a specific imaging task and a network training data set composed of different components. According to the invention, a single-frame, real-time and no-reference phase extraction method is realized, and the method has high image reconstruction quality and good robustness.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology and relates to a phase imaging method, in particular to a phase imaging method based on a thin scattering medium. Background technique [0002] Phase imaging is mainly used to deal with the phase problem in optical imaging and is one of the components of holographic imaging. Since the existing photoelectric imaging devices or optical imaging systems can only capture the intensity information of the scene, it is quite difficult to reconstruct the complex amplitude (amplitude and phase) directly through the original amplitude recording, so special optical recording methods and algorithms are needed The phase information of the scene and the target is recovered. [0003] Existing complex amplitude recording techniques, such as digital holography, can encode and extract target amplitude and phase information through optical interference. In addition to being widely used in 3D image photograp...

AI Technical Summary

Problems solved by technology

However, due to the iterative calculation process of most phase recovery algorithms, in addition to the strict calibration of the experimental system, it is also necessary to obtain the prior knowledge of the target or the measurement of multiple observation pla

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