A continuously adjustable hyperspectral imaging method and system

Abstract

Disclosed is a continuously adjustable hyperspectral imaging method and system, utilizing a hyperspectral imaging system including a lens, a sensor, and an FPI filter assembly between the lens and the sensor, including adjusting the FPI mirror spacing of the FPI filter assembly to perform frame-by-frame Shooting to obtain the raw data after black level correction for each frame; for wavelengths corresponding to different mirror pitches, select the corresponding RGB channel from the raw data, and obtain a single-channel response image corresponding to the wavelength to filter the band in the raw data The secondary peaks of the single-channel response image were interpolated by Bayer array to obtain continuous hyperspectral images corresponding to visible light wavelengths. This application obtains the complete single-peak FPI pixel data corresponding to the wavelength in the visible light band range, and at the same time can reduce the amount of calculation to a minimum, greatly expanding the flexibility and application scenarios of FPI-like hyperspectral imaging technology.

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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