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Principle scheme of VIS image segmentation by means of VIS/FLU image alignment. Higher plant-background contrast enables a straightforward segmentation of FLU images (A) resulting in a binary mask of the plant region (B). Inhomogeneous illumination and visibility of diverse background structures challenge an accurate segmentation of VIS images (C). By applying the binary mask of the registered FLU image, automated segmentation of the VIS image (D) is performed.
