Long-focus spectrum coding imaging system and method based on diffraction

Abstract

The invention discloses a long-focus spectrum coding imaging system and method based on diffraction. The method comprises the steps of 1) obtaining a coded diffraction element by using a constructive interference wavelength arrangement mode; 2) selecting an amplification factor gamma of a telescopic system, and calculating intrinsic parameters of the telescopic system to obtain the telescopic system; 3) establishing an imaging system for calibrating point spread functions, and performing a spectrum calibration experiment by using the imaging system for calibrating the point spread functions to obtain point spread functions of different wavebands; 4) constructing a long-focus spectrum coding imaging system, and performing a spectrum image acquisition experiment by using the long-focus spectrum coding imaging system to obtain spectrum aliasing images of different wavebands; and 5) processing the spectral aliasing images by using a hyperspectral image reconstruction network algorithm to obtain hyperspectral images under different wavebands. The method is beneficial for reconstructing the effect of the network algorithm and processing the diffraction element; according to the invention, the focal length of the system is increased and the diffraction element is protected; the hyperspectral images are accurate and clear, the spectrum band application range is wide, and the robustness is high.

Description

technical field [0001] The present invention relates to a spectral imaging system and method in the technical field of spectral imaging, in particular to a diffraction-based telephoto spectral encoding imaging system and method. Background technique [0002] Spectral imaging technology is a new technology that utilizes single or multiple spectral channels for spectral data acquisition and processing, image display and analysis interpretation. The main purpose is to obtain almost continuous spectral data of each pixel while obtaining a large number of target narrow-band continuous spectral images. At present, spectral imaging technology is mainly used in the field of hyperspectral aviation and space remote sensing. [0003] At present, the spectral imaging system mainly faces the following technical difficulties: First, the system structure of push-broom and swing-broom is too large and complex to meet the requirements of miniaturization and light weight in aviation and aeros...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the technical problems in the background technology, traditional spectral imaging systems have complex structures, low timeliness in obtaining spectral information, long focal lengths are required for deep space detection, and the diffraction elements in rotational diffraction are small in size, small in light transmission, complex in structure, difficult to process, and easy to process. damage, the reconstruction effect still has room for improvement, the point spread function calibration has limitations, and the spectral imaging range is not wide enough. The present invention adopts a diffraction-based telephoto spectral encoding imaging system and method

Images