Table 3.

Calculation of grey correlation matrix features according to Haralick et al. (1973).

Texture feature calculated on RED raster	Formula	Explanation
Contrast	${\sum }_{i,j=0}^{N-1}{P}_{ij}{(i-j)}^2$	Amount of local variation in pixel values
Correlation	${\sum }_{i,j=0}^{N-1}{P}_{ij}\frac{(i- \mu )(j-\mu )}{{\sigma }^2}$	Linear dependency of grey level values in the GLCM
Dissimilarity	${\sum }_{i,j=0}^{N-1}{P}_{i,j}\left|i-j\right|$	Local roughness of the pixel values
Energy	${\sum }_{i,j=0}^{N-1}{(P_{ij})}^2$	Local steadiness of the gray levels
Homogeneity	${\sum }_{i,j=0}^{N-1}\frac{P_{ij}}{1+{(i-j)}^2}$	Homogeneity of the pixel values