Continuously adjustable hyperspectral imaging method and system

Abstract

The invention discloses a continuously adjustable hyperspectral imaging method and system. The method employs the hyperspectral imaging system comprising a lens, a sensor and an FPI filtering assembly between the lens and the sensor, and comprises the following steps: adjusting the FPI mirror surface spacing of the FPI filtering assembly, and carrying out the frame-by-frame shooting to obtain the raw data of each frame after black level correction; and selecting corresponding RGB channels from the raw data for wavelengths corresponding to different mirror surface distances, acquiring a single-channel response image corresponding to the wavelength to filter secondary peaks in a wave band in the raw data, and performing Bayer array interpolation on the single-channel response image to acquire a continuous hyperspectral image corresponding to the visible light wavelength. The single-peak FPI pixel data in one-to-one correspondence with the wavelengths in the complete visible light wave band range is obtained, meanwhile, the calculation amount can be reduced to the minimum, and the flexibility and the application scene of the FPI hyperspectral imaging technology are greatly expanded.

Description

technical field [0001] The invention relates to the technical field of hyperspectral imaging and spectral analysis, and in particular to a continuously adjustable hyperspectral imaging method and system. Background technique [0002] Hyperspectral imaging technology can obtain image information and spectral information at the same time, combined with machine vision technology to distinguish objects, and can also perform spectral analysis dependent on spectrum, which is a new technology with great potential. The spectral analysis capability of hyperspectral imaging technology comes from the fact that hyperspectral can collect spectral information emitted by substances at different wavelengths, and these spectral information directly reflect information such as the physical and chemical composition of objects; combined with information such as image recognition and selection, hyperspectral imaging The technology can realize the complete automation of target detection-compositi...

AI Technical Summary

Problems solved by technology

[0006] 1. It is difficult to obtain a continuous and complete spectral image of the visible light band, that is, either sacrifice the band range and narrow the span of the continuously adjustable band; or sacrifice accuracy, which is interfered by the coexistence of FPI multi-level peaks, so that it is impossible to obtain accurate one-to-one correspondence with wavelengths The pixel spectral data of

[0007] 2. There will be multiple transmission wavelengths under the modulation pitch of the same cavity. If combined with multi-peak decoupling, complex mathematical calculations are required, which not only sacrifices accuracy and reduces output speed, but also does not have a good mathematical method for it. Thorough one-to-one decoupling

[0008] By reducing the minimum pitch of FPI modulation, it is also possible to achieve the result of not having multiple secondary peaks in a certain range of visible light, but this poses a great challenge to the physical limitations of the FPI MEMS chip, and the stability and reliability will be reduced. It is difficult to realize the hardware technical means

In addition, using multiple FPI camera combinations, switching multiple sets of filters, or splicing multiple chips can also solve the above problems, but the disadvantages brought about are not only the increase in cost and the reduction in equipment flexibility, but also the spliced ​​data. will create reliability issues

[0009] At present, the industry still lacks an effective method that can simply, accurately and quickly eliminate the interference of FPI secondary peaks to achieve continuous spectral output in the visible light range of the human eye.

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