Fig. 4: Application of the HyperspecI sensor for intelligent agriculture.
From: A broadband hyperspectral image sensor with high spatio-temporal resolution
a, The prototype using the HyperspecI sensor for agriculture spectra acquisition. It includes two distinct modes: the mode of leaf transmission spectra acquisition and the mode of apple reflectance spectra acquisition. b, The working principle of measuring the SPAD index, which is used to evaluate the chlorophyll content of leaves, is shown on the left. SPAD evaluation results using the HyperspecI sensor are shown on the right. c, The working principle of measuring SSC, used to evaluate apple quality, is shown on the left. The comparison between the measured SSC using a commercial product and the predicted SSC using our HyperspecI sensor and PLS regression model is shown on the right. d, The comparison between RGB images and the synthesized RGB images using the reconstructed hyperspectral images. The figure in the middle shows a comparison between the spectra acquired by a commercial spectrometer and the reconstructed spectra at exemplar randomly selected locations. a.u., arbitrary units.
