Table 1.

Results of the PCA for image features and physicochemical properties

Principal components	Eigen value	% Variance	Cumulative variance %
Image features
PC1	3.61	40.09	40.09
PC2	2.20	24.47	64.56
PC3	1.69	18.78	83.34
PC4	1.05	11.62	94.96
Physicochemical properties
PC1	5.91	28.12	28.12
PC2	4.10	19.55	47.67
PC3	2.77	13.17	60.84
PC4	2.25	10.70	71.54
PC5	1.45	6.90	78.44
PC6	1.28	6.08	84.51