Digital synthetic aperture imaging method based on pupil modulation

Abstract

The invention relates to a digital synthetic aperture imaging method based on pupil modulation. The digital synthetic aperture imaging method performs functions of restoring the optical field of the pupil, correcting single-aperture aberration, realizing multi-aperture common-phase, and obtaining high-resolution image through synthesis. According to the digital synthetic aperture imaging method, the pupil plane of each imaging subsystem is modulated by means of an external diaphragm; according to different modulation information (diameter, position or size of the light through hole of the diaphragm) and a corresponding image, reconstructing the optical field of each pupil by means of a Fourier ptychography algorithm; representing phase distribution of the optical field by means of a Zernike polynomial, optimizing a pixel evaluation function by means of a digital correction method, correcting an aberration of the single aperture and aberrations between multiple apertures, and combining pupil incoming optical fields for obtaining a high-resolution image based on a digital imaging principle. According to the digital synthetic aperture imaging method, optical field reconstruction, aberration correction and image synthesizing are combined. The digital synthetic aperture imaging method has advantages of high resolution of obtained image, compact optical path, simple device structure, low cost, etc.

Description

technical field [0001] The invention relates to a synthetic aperture imaging method, in particular to a new synthetic aperture imaging method based on pupil modulation, which uses a modulation diaphragm on the pupil surface of the subsystem to realize light field reconstruction, single aperture and multi-aperture aberrations Correction and synthesis imaging can reconstruct the light field of the pupil, and then digitally process the light field to correct aberrations, achieve sub-aperture co-phase, and synthesize high-resolution images. Background technique [0002] The optical synthetic aperture technology aims to use the easy-to-manufacture small-aperture system to synthesize a large-aperture system through optical means, so as to meet the high-resolution imaging requirements and solve the problem that the resolution is limited by the aperture size in practical applications. Synthetic aperture imaging techniques are generally divided into two types: baseline interferometri...

AI Technical Summary

Problems solved by technology

At present, the common phase detection technology proposed by scientists includes the detection technology based on the position information of interference fringes, the detection technology based on far-field image analysis, and the detection technology using special optical instruments. These technologies can realize the detection of translational phase errors under certain conditions. , but there are common defects, that is, the optical path used is complicated, the system is expensive, and the applicability is poor

Moreover, most of the correction methods adopted for the detected translational phase error are based on complex mechanical control, which have high requirements on mechanical structure, manufacturing process and control accuracy.

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