Skewed distribution of leaf color RGB model and application of skewed parameters in leaf color description model

Table 3 Correlation between the skewed-distribution parameters and the blade SPAD values of the tobacco leaves

	R_Mean	R_Median	R_Mode	R_Skewness	R_Kurtosis	G_Mean	G_Median	G_Mode	R_Skewness	R_Kurtosis
Pearson correlation	− 0.763**	− 0.728**	− 0.592**	− 0.458**	− 0.007**	0.711**	0.637**	− 0.480**	0.312**	− 0.109

	B_Mean	B_Median	B_Mode	B_Skewness	B_Kurtosis	Y_Mean	Y_Median	Y_Mode	Y_Skewness	Y_Kurtosis
Pearson Correlation	− 0.402**	− 0.337**	− 0.341**	− 0.268**	− 0.300**	− 0.744**	− 0.680**	− 0.526**	0.339**	− 0.078

The 20 parameters with the red, green, and blue color channels as well as the gray-level images were obtained with MATLAB using 50 pieces of fully expanded tobacco leaves at 40, 50, 60 and 65 days, respectively
** Indicates significant correlation according to a two-tailed test (p < 0.01)
* Indicates significant correlation according to a two-tailed test (p < 0.05)

ISSN: 1746-4811