Table 1.

Used texture features.

Feature identifier	Feature	Definition
T1	ASM28	$T1=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}{\left\{p\left(i,j\right)\right\}}^2$
T2	Entropy28	$T2=-\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}p\left(i,j\right)log\left(p\left(i,j\right)\right)$
T3	Dissimilarity28	$T3=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}\left|i-j\right|p\left(i,j\right)$
T4	Contrast28	$T4=\sum _{n=0}^{Ng-1}{n}^2\left\{\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}p\left(i,j\right)\left|i-j\right|=n\right\}$
T5	Inverse difference28	$T5=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}\frac{1}{1+\left|i-j\right|}p\left(i,j\right)$
T6	IDM28	$T6=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}\frac{1}{1+\left({\left(i-j\right)}^2\right)}p\left(i,j\right)$
T7	Correlation28	$T7=\frac{{\sum }_{i=1}^{\mathit{Ng}}{\sum }_{j=1}^{\mathit{Ng}}\left(\text{ij}\right)p\left(i,j\right)-{\mu }_x{\mu }_y}{{\sigma }_x{\sigma }_y}$
T8	Autocorrelation28	$T8=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}\left(\text{ij}\right)p\left(i,j\right)$
T9	Cluster shade28	$T9=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}{\left(i+j-{\mu }_x-{\mu }_y\right)}^{3}p\left(i,j\right)$ 0
T10	Cluster prominence28	$T10=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}{\left(i+j-{\mu }_x-{\mu }_y\right)}^{4}p\left(i,j\right)$
T11	Maximum probability28	$T11=\underset{i,j}{max}p\left(i,j\right)$
T12	Variance28	$T12=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}{\left(i-\mu \right)}^{2}p\left(i,j\right)$
T13	Sum average28	$T13=\sum _{i=2}^{2Ng}{\text{ip}}_{x+y}\left(i\right)$
T14	Sum variance28	$T14=\sum _{i=2}^{2Ng}{\left(i-T15\right)}^2{p}_{x+y}\left(i\right)$
T15	Sum entropy28	$T15=-\sum _{i=2}^{2Ng}{p}_{x+y}\left(i\right)log\left\{p_{x+y}\left(i\right)\right\}$
T16	Difference variance28	$T16=\text{variance}\text{of}{p}_{x-y}$
T17	Difference entropy28	$T17=-\sum _{i=2}^{2Ng}{p}_{x+y}\left(i\right)log\left\{P_{x-y}\left(i\right)\right\}$
T18	IMC128	$T18=\frac{\text{HXY}-\text{HXY}1}{max\left\{\text{HX},\text{HY}\right\}}$
T19	IMC228	$T19={\left(1-exp\left[-2.0\left(\text{HXY}2-\text{HXY}\right)\right]\right)}^{\frac{1}{2}}$
T20	Maximal correlation coefficient28	$T20={\left(\text{Second}\text{largest}\text{eigen}\text{value}\text{of}\text{the}\text{matrix}Q\right)}^{1/2}$
T21	INN28	$T21=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}\frac{p\left(i,j\right)}{1+{\left|i-j\right|}^2/{\mathit{Ng}}^2}$
T22	IDN28	$T22=\sum _{i=1}^{\mathit{Ng}}\sum _{j=1}^{\mathit{Ng}}\frac{p\left(i,j\right)}{1+{\left(i-j\right)}^2/{\mathit{Ng}}^2}$

ASM, angular second moment; IDM, Inverse difference moment; ICM, Information measures of correlation; INN, Inverse difference normalized; IDN, Inverse difference moment normalized.