Table 2:
Texture features.
Energy:
∑
A
S
M
=
𝑘
𝑖
=
1
(
𝑔
𝑖
−
𝑔
)
−
2
𝑝
(
𝑔
𝑖
)
Uniformity:
∑
𝑈
=
𝑘
𝑖
=
1
𝑝
2
(
𝑔
𝑖
)
Entropy:
∑
E
N
T
=
−
𝑘
𝑖
=
1
𝑝
(
𝑔
𝑖
)
l
o
g
2
𝑝
(
𝑔
𝑖
)
Smoothness:
I
D
M
=
1
−
1
/
(
1
+
𝑠
2
)
, where
𝑠
=
∑
𝑘
𝑖
=
1
(
𝑔
𝑖
−
𝑔
)
−
2
𝑝
(
𝑔
𝑖
)
Given that
𝑔
𝑖
is the gray value,
k
is the number of gray levels.