Fig. 4From: Automatic freezing-tolerant rapeseed material recognition using UAV images and deep learningThe symptoms of the freezing-injured and the freezing-tolerant materials. The freezing-injured material with yellowish leaves (a), dark, fuchsia leaves (b), overturned leaves and water-soaked petioles. c, d are the freezing-tolerant materials with normal leaf colors and petiolesBack to article page