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Fig. 4 | eLight

Fig. 4

From: Microtaper leaky-mode spectrometer with picometer resolution

Fig. 4

Hyperspectral imaging demonstration using our spectrometer. a 20-channel hyperspectral imager. b Reconstruction of a projected image. The RGB colors of the input and prediction are calculated from their spectra with color matching functions. A pseudo-colored image was constructed using the prediction color data to show the detail of the input image. c Spectra of the 11 colors used to assemble the image. The black dashed lines indicate the ground truths, while the solid lines are the corresponding predicted spectra. d Photo of a color film patch. e Reconstructed RGB image of d. The colors are calculated from the transmittance spectra which is predicted by our hyperspectral imager. f Spectra of the center point of each patch in e denoted by the markers. The black dashed lines are the ground truths, while the blue solid lines with markers are the corresponding predicted spectra. The purple shaded area indicates unreconstructed wavelength range (400–450 nm) due to the limitation of light source spectral range. g Color coordinates in CIE 1931 color space of the center point of each patch in e denoted by the markers

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