Super-resolution correlation imaging system and imaging method based on low-pass filtering

Abstract

The invention relates to a super-resolution correlated imaging system and imaging method based on low-pass filtering. A CCD (Charge Coupled Device), an EMCCD (Electron-Multiplying CCD) or a CMOS (Complementary Metal Oxide Semiconductor) area array detector having spatial resolving power is used in both a reference arm light path and a detection arm light path, exposure shooting of certain time is synchronously performed on the light field intensity distribution passing through a detection target of the detection arm light path or reflected and scattered by the detection target and the light field intensity distribution of the reference arm light path according to certain time sequence, exposure data is sequentially connected to corresponding spatial filters, an appropriate threshold is set for the reference arm spatial filter and the detection arm spatial filter respectively, low-pass filtering operation is performed on area array data signals acquired at time sequence points via the reference arm spatial filter or the detection arm spatial filter according to the threshold, and finally, the two groups of area array data obtained by the reference arm light path and the detection arm light path are processed according to the traditional thermal light correlated imaging principle and method to realize super-resolution correlated imaging on an object to be imaged.

Description

technical field [0001] The invention relates to the field of super-resolution correlation imaging, in particular to a low-pass filter-based super-resolution correlation imaging system and method. Background technique [0002] Correlation imaging technology (also known as "ghost" imaging) is a new type of imaging technology that uses the high-order spatiotemporal intensity correlation properties of thermal or quantum light fields to reconstruct object information on a non-localized basis. Among them, the correlative imaging technology of thermal light source developed rapidly in recent years has many advantages different from traditional lens imaging or photographic technology, for example, it can be imaged without a lens and is suitable for any wavelength in the electromagnetic spectrum in principle, and it is not affected by atmospheric turbulence, air Due to the influence of turbidity or other scattering media, clear imaging of objects can still be obtained under the condi...

AI Technical Summary

Problems solved by technology

[0003] Although correlative imaging technology has higher imaging resolution than traditional imaging under the same conditions, it is still subject to the diffraction limit of the imaging system. At the same time, the imaging resolution and contrast of correlative imaging technology are mutually restrictive. Usually, High resolution imaging results in very low contrast, a disadvantage of correlative imaging techniques

Images