Fourier Overlay Correlation Imaging System and Method Based on Computational Ghost Imaging

Abstract

The invention provides a Fourier overlapping correlation imaging system and method based on computational ghost imaging. The system comprises a spatial filter, a spatial light modulator, an imaging module, a high speed light sensitive array, a processing module which is used for calculating the image of the corresponding position of each single pixel detector and using the image as the low-resolution image of tilted plane wave illumination whose light source is the single pixel detector, and a calculation module. The calculation module is used for carrying out Fourier transforming on the low-resolution image to acquire the move and low-pass filter of a spectrum corresponding to a target high-resolution image at the incident angle and the numerical aperture of the objective lens, splicing the overlapped relevant parts of the spectrum of the low-resolution image to acquire the spectrum of the target high-resolution image, and using a phase recovery algorithm to acquire the target high-resolution image. According to the invention, the image acquisition efficiency of the whole imaging system can be improved; measurement of a wider spectrum than an ordinary array sensor is realized; compression reconstruction of an image is realized; and the rate of single imaging is improved.

Description

technical field [0001] The invention relates to the technical field of optical engineering, in particular to a Fourier overlapping correlation imaging system and method based on computational ghost imaging. Background technique [0002] The throughput of conventional imaging systems, such as microscopes, is often limited by the spatial bandwidth product defined by their optical imaging. The space-bandwidth product refers to the number of degrees of freedom an optical system can extract from an optical signal (usually the number of resolvable pixels). Therefore, conventional imaging systems usually cannot directly obtain images with wide field of view and high spatial resolution. At present, in the field of life science and biomedicine, it has become an urgent need to clearly observe a single cell and observe as many cells as possible in the same field of view. The collection of high-resolution images has become a key technical bottleneck. [0003] Common ideas for improvi...

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Problems solved by technology

However, the mechanical scanning method based on synthetic aperture requires a precise mechanical structure to ensure the control accuracy of the system, so as to achieve the expected space-bandwidth product, and the optical alignment and motion tracking make the imaging process complex and slow; such as digital coaxial holography and contact The lensless imaging method of imaging microscopy also has certain limitations. For example, digital coaxial holography cannot image continuous samples well, and contact imaging microscopy requires the sample to be close enough to the sensor.

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