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Data augmentation of grape leaf disease images. (A) Original image; (B) low brightness; (C) high brightness; (D) low contrast; (E) high contrast; (F) vertical flip; (G) horizontal flip; (H) low sharpness; (I) high sharpness; (J) 90° rotate; (K) 180° rotate; (L) 270° rotate; (M) Gaussian noise; (N) PCA jittering.
