Super-resolution spectral imaging system and super-resolution spectral imaging method based on scattering medium

Abstract

The present invention relates to a super-resolution spectral imaging system and a super-resolution spectral imaging method based on a scattering medium. The super-resolution spectral imaging system comprises a calibration branch A, a scattering medium 4, a lens 5, a detector 6 and a branch B to be detected, wherein the calibration branch A comprises a light source module 1, a first collimation beam expansion system 2 and a pinhole 3, and the branch B to be detected comprises a light source 7 to be detected, a second collimation beam expansion system 8 and a target 9. According to the embodiments of the present invention, the point spread functions of the system are measured when the light source module outputs different wavelengths so as to construct the spectral point spread function (SPSF), the spectral reconstruction is achieved by using the compressed sensing (CS) method while the scattering medium with the appropriate scattering mean free path is matched, and the speckle receivedby the camera is subjected to convolution removing by using the point spread function corresponding to the wavelength of the light source to be detected, such that the maximum super-resolution imagingcan be achieved without the increase of the complexity of the system; and the super-resolution spectral imaging system has advantages of simple structure, easy control, low component cost, strong anti-disturbance capability and wide application field.

Description

technical field [0001] The invention belongs to the technical field of super-resolution spectral imaging, and in particular relates to a super-resolution spectral imaging system and method based on a scattering medium. Background technique [0002] Spectral imaging technology can obtain the spatial information and spectral information of the target, and can classify substances according to their unique spectral characteristics. At present, it has been widely used in civil, military, marine and criminal investigations. Traditional Spectral Imaging Techniques Imaging spectroscopy techniques can be divided into three categories: dispersion type, filter type and interference type. [0003] The super-resolution spectral imaging method is the most widely used. It is a kind of dispersion-type spectroscopic technology, including prism spectroscopic technology and grating spectroscopic technology. Diffusion; grating spectroscopic technology uses the principle of diffraction to scatt...

AI Technical Summary

Problems solved by technology

[0006] All of the above methods can achieve spectral imaging, but they all have shortcomings. For example, because one imaging can only obtain a one-dimensional or two-dimensional subset of the complete three-dimensional data cube, in order to obtain the complete spectral image of the target, it is necessary to scan time. , such as push broom, staring scan, etc. At the same time, with the improvement of spatial resolution and spectral resolution, the frame rate requirements of detectors are also getting higher and higher, and the transmission of large quantities has become a big problem, which limits the traditional Applications of super-resolution spectral imaging methods

This method can flexibly select optical splitting elements, such as multimode optical fiber, photonic crystal, etc., but when multimode optical fiber acts as an optical splitting element, its anti-disturbance ability is poor, and it requires high structural complexity of the optical system, which is not conducive to accurate reconstruction of spectral signals; Components such as photonic crystals have the disadvantage of reducing the signal-to-noise ratio of the target signal to be measured, and the above two kinds of spectroscopic components cannot achieve super-resolution imaging of existing systems

Images