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Method for eliminating astigmatism in imaging of object by grating based on sequential image analysis

A technology of sequential images and grating pairs, applied in image analysis, image enhancement, image data processing, etc., can solve the problems of achromatic imaging accompanied by astigmatism and affect the imaging quality, so as to eliminate astigmatism and improve the imaging quality of objects. Effect

Active Publication Date: 2018-08-24
GUANGXI UNIV
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Problems solved by technology

This imaging system can be used for aiming, positioning and measuring the target object across obstacles, and for making new filter systems, etc., but its achromatic imaging is often accompanied by astigmatism, which seriously affects the imaging quality

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  • Method for eliminating astigmatism in imaging of object by grating based on sequential image analysis
  • Method for eliminating astigmatism in imaging of object by grating based on sequential image analysis
  • Method for eliminating astigmatism in imaging of object by grating based on sequential image analysis

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Embodiment Construction

[0062] The present invention is described in detail below in conjunction with accompanying drawing:

[0063] Such as figure 1 As shown, a method for astigmatism of object imaging based on sequential image analysis grating includes the following steps:

[0064] (1) The CCD camera collects the sequence images on the diffraction light path formed by the light source passing through the dispersion grating at different grating spatial frequencies;

[0065] (2) Convert each frame of the collected sequence image into a grayscale image and perform normalization processing, and then perform adaptive median filtering to improve image quality, smooth noise, and protect image edge information, and then sharpen the image Edge function extraction;

[0066] (3) Based on the fitting model of Boltzmann function, the horizontal and vertical ESF of each frame is obtained, the ESF is differentially processed to obtain the LSF, and the horizontal and vertical LSF are cross-multiplied to obtain t...

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Abstract

The present invention discloses a method for eliminating astigmatism in imaging of an object by grating based on sequential image analysis. The method comprises the following steps of: collecting sequential images of imaging of an object by grating in different imaging conditions, employing an edge method to perform edge grey information extraction and median filtering of the collected image, obtaining a point spread function (PSF) corresponding to the edge image based on a Boltzmann function fitting model, utilizing the PSF to perform deconvolution reconstruction, and performing evaluation ofthe sequential image after reconstruction.

Description

technical field [0001] The invention relates to a method for processing astigmatism of grating-to-object imaging, in particular to a method for grating imaging based on sequential image analysis. Background technique [0002] Grating is an important and widely used optical element. It not only has the well-known dispersion and light splitting functions, but also has imaging functions. There are different types of grating imaging. Among them, the Talbot effect and Lau effect that reflect the self-imaging phenomenon of gratings discovered in the early years have been widely studied and applied, and another kind of imaging that is different from them - the study of double gratings on the dispersion imaging of objects Work is still in its infancy. This imaging makes the grating an imaging device for general objects like lenses and mirrors. Compared with traditional lens imaging, it has the advantage of lightness and lightness, which is exactly the disadvantage that traditional ...

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Application Information

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IPC IPC(8): G02B27/00G06T5/00G06T5/10G06T7/00G06T7/13G06T7/44
CPCG02B27/0012G06T5/10G06T7/0002G06T7/13G06T7/44G06T2207/30168G06T2207/20032G06T2207/10004G06T5/00
Inventor 卢泉张卫平张泽昊石瑞宇
Owner GUANGXI UNIV