Method and system for achieving edge enhancement imaging

Abstract

The invention discloses a method and system for achieving the edge enhancement imaging, and the method comprises the steps: projecting an expanded beam and a collimated Gaussian beam to an object; carrying out the first Fourier transform of the beam passing through the object, modulating the beam after the first Fourier transform, performing the second Fourier transform of the modulated beam and then performing imaging, wherein the obtaining process of a filtering function for modulating the beam comprises the following steps: combining the modulation effect of the amplitude and phase for theedge enhancement imaging, and superposing four Gaussian functions to obtain a point diffusion function, wherein a condition that there is no surplus sidelobe around a main lobe is met; performing thereverse calculation of the point diffusion function through the Fourier transform, thereby achieving the high-resolution and isotropic edge enhancement imaging in a Fourier plane of a second Fourier lens.

Description

technical field [0001] The present invention relates to the technical field of edge-enhanced imaging, in particular to a method and system for realizing edge-enhanced imaging. Background technique [0002] Edge-enhanced imaging technology has great applications in the field of imaging. In 1942, Zernike realized phase contrast imaging for the first time. Since then, a lot of work has been used to study this technology. Marr and Torre et al. Imaging has a big contribution. At present, the techniques commonly used to achieve edge-enhanced imaging mainly include ① numerical space differential imaging, ② differential interference contrast imaging, and ③ Hilbert transform filter imaging. [0003] In 2018, Zhu Tengfeng used the surface plasmon structure to achieve spatially differential edge-enhanced imaging in experiments, but this digital imaging technology cannot achieve phase pairing well when the object has no obvious features. The differential interference contrast imaging ...

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Problems solved by technology

[0003] In 2018, Zhu Tengfeng used the surface plasmon structure to achieve spatial differential edge-enhanced imaging in experiments, but this digital imaging technology cannot achieve phase alignment well when the object has no obvious features.

However, we found that there are a large number of redundant side lobes on both sides of the main lobe of the point spread function of the traditional vortex phase plate. This phenomenon will cause diffraction noise at the edge of the imaging result, making the result uneven, and this effect will be becomes severe with increasing topological sum

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