A super-resolution correlation imaging system and imaging method

Abstract

The invention relates to a super-resolution correlation imaging system and method. The system comprises a light source, a threshold filtering control and regulation system and a conventional correlation imaging conforming measurement system. Light emitted out from the light source is split into two beams by a beam splitter, wherein the transmitted beam is illuminated onto a transmissive spatial light modulator, and the reflected beam is detected by a CCD with spatial resolving capability, an EMCCD or a CMOS planar array detector. Spatial distribution of the light intensity is obtained, a filtering operation is performed by a threshold filter according to a set threshold value, and a modulation matrix generated according to intensity spatial distribution planar array data after filtering isused for driving the spatial light modulator to perform a filtering operation on the transmitted light intensity corresponding to the reflected light beam. When high-pass filtering is adopted, the appropriate threshold value is selected so that the imaging contrast can reach 100%. Therefore, the influence of traditional correlation imaging direct-current background noise can be completely eliminated, background-free super-resolution correlation imaging can be achieved, and the imaging quality is better than that of a traditional method.

Description

technical field [0001] The invention relates to the field of super-resolution correlation imaging, in particular to a super-resolution correlation imaging system and method based on intensity threshold filtering. 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 obtaine...

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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

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