Skip to main content

Table 2 Rate e of new visible edges, mean ratio r Ì„ of the gradients at visible edges and the image information entropy H for these methods on three test images

From: Visibility enhancement using an image filtering approach

Images/Index

[20]

[21]

Proposed

Forest

e

0.35

0.54

0.02

 

r Ì„

0.59

2.26

1.45

 

H

5.15

7.25

6.42

Wall

e

0.15

0.44

0.20

 

r Ì„

0.45

1.86

1.77

 

H

6.14

7.34

7.08

Sweden

e

−0.09

0.49

0.29

 

r Ì„

0.65

1.73

2.02

 

H

6.42

7.38

7.37