Mango Grading System Based on Optimized Convolutional Neural Network

Table 4

Quality grade of mango NY/T 3011-2016.

Grade	Requirement
First-grade mango	Mango fruit shape is not deformed and size is uniform. The color of the fruit is normal and uniform. The pericarp is smooth, almost without defects, with no more than 2 single spots, and the diameter of each spot is less than 2 mm.
Second-grade mango	Mango fruit shape has no obvious deformation. The color of the fruit is normal and more than 75% of the fruit surface is uniform. The pericarp is smooth, with no more than 4 spots per fruit, and the diameter of each spot is less than 3 mm.
Third-grade mango	Deformation of mango fruit shape is not allowed to affect the quality of mango products. The color of the fruit is normal and more than 35% of the fruit surface is uniform. The pericarp is relatively smooth, with no more than 6 spots per fruit, and the diameter of each spot is less than 3 mm.