Single-lens calculation imaging method based on phase recovery

A phase recovery and computational imaging technology, applied in optical components, instruments, optics, etc., can solve the problems of simplification of imaging system with high imaging quality, reduction of aberration correction cost and complexity, etc., to reduce complexity and save time , Solve the effect of high image quality

Active Publication Date: 2020-08-25
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a single-lens computational imaging method based on phase recovery, which solves the contradiction between high imaging quality and simplification of the imaging system, and reduces the cost and complexity of aberration correction

Method used

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  • Single-lens calculation imaging method based on phase recovery
  • Single-lens calculation imaging method based on phase recovery
  • Single-lens calculation imaging method based on phase recovery

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Embodiment

[0062] combine Figure 1~4 , in the embodiment, the present invention is simulated on the MATLAB platform, the laser source selection wavelength is a light source of 632.8nm, the lens selection is a positive lens with a diameter of 25mm and a focal length of 250mm, the object distance is 10m, and the imaging object selection is a lena map, and the size is 16mm × 16mm. Proceed as follows:

[0063] Step 1) as in figure 2 As shown, expand the beam of the laser light source, make more beams enter the lens as much as possible, and simulate the optical path of parallel light entering the lens in MATLAB. The effect of the lens on the beam can be calculated by adding the lens phase conversion factor and the transmission The mirror aberration term and the lens aberration term are simulated by the Zernike surface, and only the spherical aberration term is added to the Zernike surface, and the coefficient is 1. In order to be close to the real experimental environment, a certain amount...

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Abstract

The invention discloses a single-lens calculation imaging method based on phase recovery. The method comprises the following steps: illuminating a lens by using parallel light without adding an imaging object, acquiring two diffraction patterns before or after focusing of the lens, and solving a pupil function of a system by using a phase recovery algorithm; solving an actual transfer function ofthe system according to the pupil function, and calculating an ideal transfer function of the system by using system focal length information; solving an aberration correction filter of the system byusing the actual transfer function and the ideal transfer function; carrying out approximate infinity imaging on an object in a system, collecting two images, and solving the complex amplitude of theclearest image by using a phase recovery algorithm, wherein one image is the clearest image which can be collected; and finally, performing aberration correction on the imaged image by using the solved aberration correction filter. The aberration of the imaging system is corrected by introducing the phase recovery algorithm, the problems that the imaging system is simple in structure and low in imaging quality when the aberration is large can be solved, and extra hardware equipment does not need to be added into the system.

Description

technical field [0001] The invention relates to the technical field of optical imaging, in particular to a single-lens computational imaging method based on phase recovery. Background technique [0002] With the continuous improvement of the level of science and technology and people's living standards, people's demand for high-quality, high-resolution images is becoming stronger and stronger. At the same time, people's demand for light and low-cost imaging equipment is also increasing, which requires the imaging system to be miniaturized and simplified. For example, the single-lens system is the simplest optical system, but the imaging quality of the single-lens system often has some problems. Defects, in order to improve the imaging quality, workers engaged in optical design need to spend a lot of time on lens material selection, structure selection and system parameter optimization, which makes the processing technology difficult and the cost of optical imaging equipment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/42G02B27/00
CPCG02B27/4205G02B27/4266G02B27/0025
Inventor 高志山石芬瑜
Owner NANJING UNIV OF SCI & TECH
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