Fig. 4From: Early detection of pine wilt disease in Pinus tabuliformis in North China using a field portable spectrometer and UAV-based hyperspectral imagery(a) The original hyperspectral imaging (HI); (b) digital photo of the test area (upper) and hyperspectral image of one sampling plot of the corresponding region (lower); (c) the result of crowns segmentation and (d) the ROIs formed by manual drawingBack to article page