Method and device for correcting bent spectral lines of dispersion type spectral imager

Abstract

The invention discloses a method and device for correcting bent spectral lines of a dispersion type spectral imager. The method for correcting the bent spectral lines comprises the steps of calculating the Euclidean distance between central wavelengths and non-deviation central wavelengths lambda j of all spectral channels in the row m, selecting the position points s with the minimum distance and central wavelengths lambda m, s, selecting position points and central wavelengths adjacent to the s from the adjacent spectral channels, calculating the Euclidean distance between the central wavelengths lambda m, s corresponding to s and the non-deviation central wavelengths lambda j, and the Euclidean distance between the central wavelengths corresponding to the adjacent position points and the non-deviation central wavelengths lambda j, according to the distance calculation result, calculating the inverse distance weighting value of the central wavelengths lambda m, s corresponding to the s, and the inverse distance weighting value of the central wavelengths corresponding to the adjacent position points, and according to the calculation result of the inverse distance weighting values, calculating the spectral radiance energy value, corresponding to the non-deviation central wavelengths lambda j, of the row m. The inverse distance weighting method is adopted to carry out correction of the bent spectral lines, the precision of spectral line correction can be improved, the algorithm is simple, and the calculation speed is high.

Description

technical field [0001] The invention relates to the technical field of spectral imagers, in particular to a spectral line bending correction method and device for a dispersion-type spectral imager. Background technique [0002] Spectral imaging technology is a new type of information acquisition technology developed in the 1980s, which can simultaneously acquire two-dimensional spatial information and one-dimensional spectral information of targets, and has been widely used in civilian and military fields. According to different ways of splitting light, spectral imaging technology can be divided into dispersion type, interference type, tunable filter type, computed tomography type, etc. Among them, the dispersive spectral imaging technology is relatively mature and widely used. However, due to the existence of adjustment errors in the optical system, the spectral line bending (smile effect) is relatively large. Therefore, accurate spectral calibration for each pixel is requi...

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Problems solved by technology

[0005] The choice of interpolation method is related to the spectral resolution. Different interpolation methods have different accuracy under different spectral resolutions, so the versatility is not strong.

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