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Two-step phase recovery method, device and system based on single intensity measurement

A phase recovery and intensity measurement technology, applied in the field of optical imaging, can solve the problems of poor reconstruction quality and low success rate, and achieve the effect of improving quality and reconstruction success rate

Active Publication Date: 2018-12-21
ANHUI UNIVERSITY
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Problems solved by technology

Poor reconstruction quality and low success rate due to phase recovery methods from single intensity measurements

Method used

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  • Two-step phase recovery method, device and system based on single intensity measurement
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  • Two-step phase recovery method, device and system based on single intensity measurement

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Embodiment Construction

[0062] In order to further illustrate the features of the present invention, please refer to the following detailed description and accompanying drawings of the present invention. The accompanying drawings are for reference and description only, and are not intended to limit the protection scope of the present invention.

[0063] Such as Figure 1 to Figure 2 As shown, this embodiment discloses a two-step phase recovery method based on single intensity measurement, which is used to process the intensity information of the 2D complex light field captured by the image sensor. The image sensor is arranged on the back focal plane of the lens, and the lens A 2D coded aperture M is set on the front focal plane, and the method includes the following steps:

[0064] S1. Initialize the amplitude and phase of the 2D complex optical field to obtain the initial space amplitude A 1 and initial phase

[0065] S2, according to the initialization space amplitude A 1 and initial phase ...

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Abstract

The invention discloses a two-step phase recovery method, a device and a system based on single intensity measurement, belongs to the technical field of optical imaging. The method comprises the following steps: initializing the amplitude and phase of a 2D complex optical field to obtain an initialized space amplitude A1 and an initialized phase as shown in the description; synthesizing a complexamplitude g(x, y) according to the initialized space amplitude A1 and the initialized phase as shown in the description; performing Fourier transform and loop iteration of Fourier inverse transform onthe complex amplitude g(x, y) to obtain an amplitude estimate of the complex optical field in a spatial domain on a 2D coded aperture plane; based on a double intensity phase recovery algorithm, processing the amplitude information of the spatial domain and the measured frequency domain amplitude information to recover the phase of the complex optical field in the spatial domain on the 2D coded aperture plane. According to the two-step phase recovery method, the device and the system based on single intensity measurement, the quality of the reconstructed phase and the success rate of reconstruction can be significantly improved.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a two-step phase recovery method, device and system based on single-intensity measurement. Background technique [0002] Phase recovery is the recovery of lost phase information from recorded intensity measurements combined with known prior knowledge, and has played a very important role in imaging fields, such as: X-ray crystallography, optics, astronomical imaging, microscopy, and biomedicine. [0003] Gerchberg and Saxton first proposed a phase recovery algorithm for alternating projections—the GS algorithm (Gerchberg-Saxton algorithm). The algorithm mainly recovers the phase of the light field using the intensity data in the spatial domain and the Fourier domain. Subsequently, Fienup proved that the GS algorithm has obvious error reduction properties, and proposed an error reduction (Error Reduction, ER) algorithm and a hybrid input-output (Hybrid Input-Output, HIO) ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J1/42
CPCG01J1/42
Inventor 张成王美琴陈倩文汪东韦穗
Owner ANHUI UNIVERSITY
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