Table 2 Definitions of the kurtosis, skewness and Shannon entropy.
Parameter | Equation | Description |
|---|---|---|
Contrast | \(C={\sum }_{i,j}{\left|i-j\right|}^{2}\bullet GLCM(i,j)\) | i,j—values of the neighboring voxels; GLCM(i,j)—i,j element of the GLCM; \({\mu }_{i}\), \({\mu }_{j}\)—mean value of i or j column; \({\sigma }_{i}{\sigma }_{j}\)—variation of i or j column |
Correlation | \(COR={\sum }_{i,j}\frac{(i-{\mu }_{i})(j-{\mu }_{j})\bullet GLCM(i,j)}{{\sigma }_{i}{\sigma }_{j}}\) | |
Energy | \(En={\sum }_{i,j}{GLCM(i,j)}^{2}\) | |
Homogeneity | \(H={\sum }_{i,j,}\frac{GLCM(i,j)}{1+\left|i-j\right|}\) |
